TW201814378A - A local dimming edge type backlight module and display device thereof - Google Patents

Abstract

A local dimming edge type backlight module and display device thereof is disclosed. The edge type backlight module includes a first light guide plate that has a first light incident side and a lighting exiting surface. The first light incident side receives the light from a first light bar, and the thickness of the first light guide plate is decreasing from the first light incident side to opposite side, so that the sectional view of the first light guide plate is wedge-shaped. The edge type backlight module also includes a second light guide plate that has a second light incident side. The second light incident side receives the light from a second light bar, and the thickness of the second light guide plate is decreasing from the second light incident side to opposite side, so that the sectional view of the second light guide plate is wedge-shaped. A reflective structure is provided on the bottom of the second light guide plate. Thereby, the light of first light bar and the second light bar are guided by the first light guide plate and the second light guide plate, and exiting from the light exiting surface, so that the thickness and weight of the backlight module and display device can be reduced; and local dimming can be achieved by controlling the active status of the first light bar and the second light bar.

Description

   Side-entry backlight module with segment light output control and display device thereof   

The invention relates to the field of backlight modules, in particular to an edge-lit backlight module with segment light output control and its display device.

The excellent optical characteristics of the light guide plate make it not only used alone, but also combined with the remaining optical components to form a backlight module for use in electronic products such as displays. The light guide plate used for the backlight module has a light exit surface to guide the light entering the light guide plate to form a surface light source on the light exit surface and project to the display panel for display purposes.

At present, the market demand for electronic products is gradually leaning toward thinness. Therefore, the design direction of the backlight module mounted on it must also be toward thinning. The edge-lit backlight module gradually replaces the direct backlight module. With the development of the industry, the display function and quality requirements of electronic products are becoming more and more diverse. In order to improve the display quality of electronic products, in addition to providing a uniform surface light source to the display panel, the backlight module must further control the light intensity and area To improve the sharpness and contrast of the display screen.

Under the requirements of segment light control and thinning and thinning, the backlight module of the traditional single light guide plate has been unable to meet the needs, and manufacturers have gradually developed and improved. When the section lighting control is the main point of development, the wedge-shaped light guide plates are assembled to the required size by splicing instead of stacking, and then each light guide plate is equipped with a light source to facilitate light output adjustment. However, when a large-size light guide plate is to be produced, since a plurality of small-sized wedge-shaped light guide plates need to be assembled, the production cost is relatively greatly increased, and the overall weight is also increased due to the increase in the number of light guide plates. The optical design of the light guide plate is also extremely difficult, so it still cannot meet the requirements of today's thin and thin backlight modules and section light control.

In view of this, one object of the present invention is to provide an edge-lit backlight module with segment light output control and a display device thereof, which can effectively reduce the overall thickness and weight of the backlight module with single-sided light output and reduce production Cost, and at the same time have excellent section dimming effect to improve the display quality.

To achieve the above object, the present invention discloses in one embodiment an edge-lit backlight module with segment light exit control, which includes: a first light guide plate having a first light incident side and a light exit surface, and the The thickness of the first light guide plate gradually decreases from the first light incident side toward the opposite side to make the cross section of the wedge shape; a second light guide plate has a second light incident side, and the thickness of the second light guide plate is The second light incident side gradually decreases toward the opposite side so that its cross section is wedge-shaped; the second light guide plate is provided on the bottom side of the first light guide plate and assembled into one body, and the first light entrance side and the second entrance The light side is oppositely arranged; a reflective structure is provided on the bottom side of the second light guide plate; a first light bar is provided corresponding to the first light incident side to provide light to the first light guide plate; and a second light Bar, corresponding to the second light incident side, to provide light to the second light guide plate; thereby, the light of the first light bar and the second light bar are respectively received by the first light guide plate and the second light guide plate Guide and emit light on the light-emitting surface, and achieve section dimming by controlling the driving states of the first light bar and the second light bar. Through the wedge-shaped first light guide plate and the second light guide plate, the aforementioned side-entry backlight module can reduce the overall thickness and weight, while providing the function of section light control.

In another embodiment, it is disclosed that when the specifications of the first light bar and the second light bar are the same, the first light bar is guided by the first light guide plate to emit light from the light exit surface with a brightness of L ₁ , The second light bar is guided by the second light guide plate to emit light from the light exit surface with a brightness of L ₂ , and the light exit surface has light exits of L ₁ + L ₂ , L ₁ , L ₂ and 0, respectively brightness. By controlling the lighting states of the first light bar and the second light bar, the light exit surface can have at least the four brightness performances described above, so as to quickly control the light output brightness according to the display requirements.

In order to further control the light output brightness of each area of the light exit surface, in another embodiment, it is disclosed that the first light bar has plural first light sources, the second light bar has plural second light sources, and the light exit surface is divided into plural light exit control areas Each of the light-emitting control areas is arranged perpendicular to and adjacent to the first light-incident side, and each of the light-emitting control areas corresponds to at least one first light source and at least one second light source. In this way, by adjusting the driving states of the first light sources and the second light sources, the corresponding light output control areas can have the required brightness.

Wherein, in order to improve the light uniformity of the light-emitting surface, in one embodiment, the first light guide plate is provided with a first light-equalizing microstructure group on the light-emitting surface to homogenize the overall light output.

In another embodiment, the second light guide plate is provided with a second homogenizing microstructure group on a bottom surface to guide the light entering the second light guide plate to exit from the bottom surface and contact the reflective structure to reflect to the first guide The light plate further forms light on the light exit surface.

The present invention also discloses in one embodiment a display device with section light emission control, which includes: a liquid crystal panel; and a side-entry backlight module, which is provided on one side of the liquid crystal panel and includes: a first light guide plate, It has a first light incident side and a light exit surface, and the thickness of the first light guide plate gradually decreases from the first light incident side toward the opposite side to make the cross section of the wedge shape; a second light guide plate has a second The light entrance side, and the thickness of the second light guide plate gradually decreases from the second light entrance side toward the opposite side to make the cross section of the wedge shape; the second light guide plate is provided on the bottom side of the first light guide plate and is set as Integrated, and the first light incident side and the second light incident side are oppositely arranged; a reflective structure is arranged on the bottom side of the second light guide plate; a first light bar is arranged corresponding to the first light incident side, to Providing light to the first light guide plate; and a second light bar, corresponding to the second light incident side, to provide light to the second light guide plate; thereby, the first light bar and the second light bar The light is guided by the first light guide plate and the second light guide plate respectively to emit light on the light exit surface, and achieves section dimming by controlling the driving states of the first light bar and the second light bar. Through the wedge-shaped first light guide plate and the second light guide plate, the overall thickness and weight of the side-entry backlight module are reduced, which can meet the needs of thinness, and at the same time have excellent section light control performance, which further improves Overall display quality.

In one embodiment, when the specifications of the first light bar and the second light bar are the same, the first light bar is guided by the first light guide plate to emit light from the light exit surface with a brightness of L ₁ , the first The two light bars are guided by the second light guide plate to emit light from the light exit surface with a brightness of L ₂ , and the light exit surface has a light output brightness of L ₁ + L ₂ , L ₁ , L ₂ and 0, respectively. By adjusting the driving state of the first light bar and the second light bar, the side-entry backlight module can have at least four kinds of the aforementioned light output brightness, so as to adjust the brightness in real time according to the display requirements.

Similarly, in still another embodiment, the first light bar has a plurality of first light sources, the second light bar has a plurality of second light sources, the light exit surface is divided into a plurality of light output regulation areas, and each of the light output regulation areas is related to the The first light-incident side is arranged vertically and adjacent to each other, and each light-outgoing regulation area corresponds to at least one first light source and at least one second light source. In this way, the lighting states of the first light source and the second light source can be adjusted separately, so that each light output regulating area has a different light output intensity, and the effect of adjusting the light emission state of each area of the light output surface according to display requirements can be achieved.

In order to homogenize the light output of the side-entry backlight module, in one embodiment, the first light guide plate is provided with a first light-equalizing microstructure group on the light-emitting surface to adjust through the first light-equalizing microstructure group The distribution status of the light extraction capacity of the light exit surface.

Similarly, in still another embodiment, the second light guide plate is provided with a second homogenizing microstructure group on a bottom surface to guide the light entering the second light guide plate to be emitted from the bottom surface and reflected by the reflective structure to the first A light guide plate, and then emit light on the light exit surface.

In summary, the edge-lit backlight module and the display device thereof with segment light output control disclosed by the present invention adopt a stacked wedge-shaped first light guide plate and a second guide under the condition that the thickness of the backlight module is limited The light board method can reduce the overall thickness and weight, and at the same time can have the effect of excellent section dimming effect. In addition, the side-lit backlight module adopts a reflective structure provided on the bottom side of the second light guide plate, so that the light of the second light bar can be reliably formed on the light exit surface of the first light guide plate after being guided by the second light guide plate. In the foregoing embodiments, the first light bar and the second light bar are also used to enable the side-entry backlight module to have at least four types of light output brightness, and even further control the light emission of each light output regulation area of the light output surface The technical characteristics of the state, while being thin and light, also have a high light control ability.

1‧‧‧Side-in backlight module

10‧‧‧First light guide plate

101‧‧‧First light entrance side

102‧‧‧Light

1021‧‧‧Exit control area

103‧‧‧The first uniform light microstructure group

11‧‧‧Second light guide plate

111‧‧‧Second light entrance side

112‧‧‧Bottom

113‧‧‧Second average light microstructure group

12‧‧‧Reflective structure

13‧‧‧First light bar

131‧‧‧First light source

14‧‧‧Second light bar

141‧‧‧Second light source

2‧‧‧Display device

20‧‧‧LCD panel

Fig. 1 is an exploded perspective view of the first embodiment of the present invention.

Figure 2 is an assembled side view of the first embodiment of the present invention.

FIG. 3 is a schematic plan view (1) of the first embodiment of the present invention.

Fig. 4 is a schematic plan view (2) of the first embodiment of the present invention.

Fig. 5 is an exploded perspective view of a second embodiment of the invention.

In the development process of backlight modules, in order to meet the requirements of thinner and lighter, the smaller the overall weight and thickness, the more ideal. But in fact, according to the size of the matching light source, the backlight module will relatively have a thickness limitation, and how to provide a backlight module with excellent segment dimming capability within this limitation, while effectively reducing the overall volume and weight, This is the direction of the industry's current commitment to research and development. In view of this, the inventor proposes an edge-lit backlight module, as described below.

Please refer to FIGS. 1, 2 and 3 to 4, which are an exploded perspective view, an assembled side view and schematic plan views of the first embodiment of the present invention. The present invention discloses a side-lit backlight module 1 with segment light output control, including a first light guide plate 10, a second light guide plate 11, a reflective structure 12, a first light bar 13 and a second Light bar 14.

As shown in FIG. 1, the first light guide plate 10 has a first light incident side 101 and a light exit surface 102, and the thickness of the first light guide plate 10 gradually decreases from the first light incident side 101 toward the opposite side to make its cross section as Wedge shape. The second light guide plate 11 has a second light incident side 111, and the thickness of the second light guide plate 11 gradually decreases from the second light incident side 111 toward the opposite side to make the cross section of the wedge shape, and the second light guide plate 11 is provided at The bottom side of the first light guide plate 10 is combined into one body, that is, the first light guide plate 10 is stacked on the second light guide plate 11, and the first light incident side 101 and the second light incident side 111 are arranged oppositely, so that The combined thickness of the first light guide plate 10 and the second light guide plate 11 is the thickness of the first light incident side 101 and the second light incident side 111. The reflective structure 12 is disposed on the bottom side of the second light guide plate 11 to reflect the light emitted from the bottom side of the second light guide plate 11 into the second light guide plate 11 and then proceeds toward the first light guide plate 11 to exit from the light exit surface 102 Form light. Preferably, the reflective structure 12 may be a sheet-like structure. The reflective structure 12 of this embodiment is actually configured to reflect the light emitted by the second light guide plate 11 on the bottom side to the second light guide plate 11 and the first light guide plate 10, and to form a single-sided light output on the light output surface 102. In other words, under the requirement of single-sided light emission, the reflective structure 12 can only be arranged at the bottom side of the second light guide plate 11, when it is set at other positions, the backlight module may have other light-emitting effects, but it will inevitably fail to achieve The effect of the light emitted from the bottom side of the second light guide plate 11 reflecting back to the first light guide plate 10 and the second light guide plate 11 is not required for the side-entry backlight module 1 of the present invention. Under different light output performance requirements, the installation positions of the reflective structures 12 cannot be replaced with each other, or the efficiency and arrangement of the reflective structure 12 of the present invention can be easily derived from other types of reflective structure 12 installation methods. The method of forming the side-entry backlight module 1 of the present invention by stacking light guide plates can meet the requirements of large-size light guide plates, and does not need to be assembled one by one by splicing, thereby effectively reducing production costs, process time and overall weight.

The first light bar 13 is disposed corresponding to the first light incident side 101 to provide light to the first light guide plate 10, and the second light bar 14 is disposed corresponding to the second light incident side 111 to provide light to the second light guide plate 11. Thereby, the light of the first light bar 13 and the second light bar 14 are guided by the first light guide plate 10 and the second light guide plate 11 respectively to emit light on the light exit surface 102, and through controlling the first light bar 13 and the second light The driving state of the bar 14 achieves zone dimming. After the first light guide plate 10 and the second light guide plate 11 are integrated into one body, depending on the sizes of the first light bar 13 and the second light bar 14, the thicknesses corresponding to the first light bar 13 and the second light bar 14 will be different. The edge-lit backlight module 1 of the invention makes the maximum thickness position of the first light guide plate 10, that is, the first light entrance side 101, and the maximum thickness position of the second light guide plate 11, that is, the second The light entrance side 111 corresponds to the aforementioned thickness design. After assembly, different light guide plates can be used to control the light-emitting sections respectively, so that when the thickness is limited, the overall thickness and weight of the backlight module can be effectively reduced, and the It has surface light emission and has the effect of segment dimming.

The specifications of the first light bar 13 and the second light bar 14 may be the same or different. In this embodiment, the first light bar 13 and the second light bar 14 have the same specifications as an example, under this condition , The first light bar 13 is guided by the first light guide plate 10 and the light brightness from the light exit surface 102 is L ₁ , the second light bar 14 is guided by the second light guide plate 11 and the light brightness from the light exit surface 102 is L ₂ , so that the light output surface 102 has the light output brightness of L ₁ + L ₂ , L ₁ , L ₂ and 0, as shown in Figure 2, but the light path in Figure 2 is only a schematic, not the actual light path. Therefore, by controlling the light-emitting states of the first light bar 13 and the second light bar 14, the side-lit backlight module 1 can have at least four brightness performances. For example, when both the first light bar 13 and the second light bar 14 are lit, the light output brightness of the side-entry backlight module 1 is L ₁ + L ₂ ; when only the first light bar 13 is lit, the side light enters The backlight module 1 has the light output brightness of L ₁ ; on the contrary, when only the second light bar 14 is lit, the side-entry backlight module 1 has the light output brightness of L ₂ ; finally, when the first light bar 13 and the second When none of the light bars 14 is lit, the light output brightness of the side-entry backlight module is 0. And after the light from the second light bar 14 enters the second light guide plate 11, it undergoes multiple reflections, and passes through the reflective structure 12 to penetrate to the first light guide plate 10, and then forms light on the light exit surface 102, so L ₂ It will be less than the lightness L ₁ of the brightness. Of course, depending on the requirements, the driving methods of the first light bar 13 and the second light bar 14 can also be changed in various ways, so as to achieve more various adjustments of the light output brightness.

As shown in FIGS. 3 and 4, preferably, the first light bar 13 has a plurality of first light sources 131, the second light bar 14 has a plurality of second light sources 141, the light output surface 102 is divided into a plurality of light output control regions 1021, each The light-emitting control area 1021 is arranged perpendicular to and adjacent to the first light-incident side 101, and each light-emitting control area 1021 corresponds to at least one first light source 131 and at least one second light source 141. As shown in FIG. 3, since the first light incident side 101 and the second light incident side 111 are arranged oppositely, the first light bar 13 and the second light bar 14 are also opposite. When the first light source is selectively turned on When 131 and the second light source 141, each light-out regulation area 1021 is affected by the different light supply states of the corresponding first light source 131 and the second light source 141, each light-out regulation area 1021 will produce different brightness performance, so that The control of a light source 131 and a second light source 141 can make the areas of the light emitting surface 102 form different light emitting brightnesses to meet the requirements of displaying images. In this embodiment, four light emission control regions 1021 are divided, and each light emission control region 1021 corresponds to two first light sources 131 and two second light sources 141 respectively. As shown in FIG. 4, the uppermost light-emitting control area 1021 has a light-emitting performance due to the driving of the second light source 141, and the next light-emitting control area 1021 is opposite because neither the corresponding first light source 131 nor the second light source 141 is driven. A darker area is formed, and the subsequent light output control area 1021 is driven by the corresponding first light source 131 and second light source 141, so this area will be the brightest area in the entire light output surface 102, and the final light output control area 1021 is the same The dark area is formed when there is no incident light as described above, so that each area of the light-emitting surface 102 can have light output with different brightness according to display requirements. Among them, the light emergence shown in Figure 4 is only a simple schematic, and does not represent the actual area division and light appearance.

Among them, in order to improve the light uniformity of the side-entry backlight module 1, a first light homogenizing microstructure group 103 is arranged on the light emitting surface 102 of the first light guide plate 10, and the first light homogenizing microstructure group 103 can be made The arrangement density gradually decreases from the first light incident side 101 toward the opposite side, so as to improve the uniformity of the light emitted by the first light bar 13 incident on the first light guide plate 10. In addition, in order to make the light incident on the second light guide plate 11 emit light on the bottom side of the second light guide plate 11 to be reflected by the reflective structure 12 to the first light guide plate 10, a bottom surface 112 of the second light guide plate 11 may also be disposed A second homogenous microstructure group 113, and its arrangement density is gradually reduced from the second light incident side 111 toward the opposite side, so as to use the second homogenous microstructure group 113 to control the light extraction ability of the bottom surface 112 and make the light exit from the bottom surface 112 ， Continuously touching the reflective structure 12 and reflecting to the first light guide plate 10 and forming light on the light emitting surface 102.

Please refer to FIG. 5, which is a schematic perspective view of a second embodiment of the present invention. In this embodiment, the present invention discloses a display device 2 with segment light output control, which includes a liquid crystal panel 20 and an edge-lit backlight module 1. The edge-lit backlight module 1 is disposed on the side of the liquid crystal panel 20, and includes a first light guide plate 10, a second light guide plate 11, a reflective structure 12, a first light bar 13 and a second light bar 14 .

The first light guide plate 10 has a first light entrance side 101 and a light exit surface 102, and the thickness of the first light guide plate 10 gradually decreases from the first light entrance side 101 toward the opposite side to make the cross section of the wedge shape, and the second light guide plate 11 has A second light incident side 111, and the thickness of the second light guide plate 11 is gradually reduced from the second light incident side 111 toward the opposite side to make the cross section of the wedge shape, the second light guide plate 11 is provided on the side of the first light guide plate 10 and The assembly is integrated, and the first light incident side 101 and the second light incident side 111 are arranged oppositely. The reflective structure 12 is disposed on the bottom side of the second light guide plate 11 and can be a sheet-like body as described above.

The first light bar 13 is correspondingly disposed on the first light incident side 101, and the second light bar 14 is correspondingly disposed on the second light incident side 111, whereby the light of the first light bar 13 and the second light bar 14 are respectively guided by the first The light plate 10 and the second light guide plate 11 are guided to emit light on the light exit surface 102, and the section dimming is achieved by controlling the driving states of the first light bar 13 and the second light bar 14, thereby improving the display quality of the display device 2.

Please refer to FIG. 2 again. Similarly, when the specifications of the first light bar 13 and the second light bar 14 are the same, the driving state of the first light bar 13 and the second light bar 14 can be adjusted to make the light emitting surface 102 have at least four The brightness is such that the first light bar 13 is guided by the first light guide plate 10 and the light emitted from the light emitting surface 102 is L ₁ , and the second light bar 14 is guided by the second light guide plate 11 and emits light from the light emitting surface 102 The brightness of the light is L ₂ , so that the light-emitting surface 102 can have light-emitting brightness of L ₁ + L ₂ , L ₁ , L ₂ and 0, respectively. The rest of the details already mentioned in the first embodiment will not be repeated here.

Please refer to FIG. 3 and FIG. 4 again, in order to control the brightness of each area of the light emitting surface 102, the first light bar 13 has a plurality of first light sources 131, the second light bar 14 has a plurality of second light sources 141, and the light emitting surface 102 is divided into a plurality of light control regions 1021, each light control region 1021 is perpendicular to the first light incident side 101 and is arranged adjacent to each other, and each light control region 1021 corresponds to at least one first light source 131 and at least one second light source 141, In this way, by controlling the driving states of the first light source 131 and the second light source 141, the light-emitting state of each light-emitting control area 1021 on the light-emitting surface 102 can be further adjusted. The rest of the details already mentioned in the first embodiment will not be repeated here.

In this embodiment, the first light guide plate 10 is provided with the first light-homogenizing microstructure group 103 on the light-emitting surface 102, and the second light guide plate 11 may also be provided with the second light-homogenizing microstructure group 113 on the bottom surface 112 to improve The first light bar 13 is incident on the first light guide plate 10 to emit light uniformity, and the light entering the second light guide plate 11 can be emitted from the bottom surface 102 and reflected by the reflective structure 12 to the first light guide plate 10 and on the light exit surface 102 forms light. The rest of the details already mentioned in the first embodiment will not be repeated here.

In summary, the edge-lit backlight module and the display device thereof with segment light output control disclosed by the present invention can reduce the volume and weight by stacking the wedge-shaped light guide plates under the predetermined maximum thickness limit, and At the same time, it achieves the effect of single-sided light output and excellent section dimming. In addition, compared to the conventional backlight module with segment dimming function, the side-entry backlight module of the present invention can greatly reduce the production cost, and only need to pass the wedge-shaped stacked first light guide plate and second light guide plate With section dimming effect. Further, in the foregoing embodiments, the light output brightness performance that can be achieved by the side-entry backlight module and the brightness control in each area of the light exit surface are also disclosed.

However, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention; therefore, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered in Within the patent scope of the invention.

Claims (10)

    An edge-lit backlight module with segment light exit control includes a first light guide plate having a first light entrance side and a light exit surface, and the thickness of the first light guide plate is determined by the first light entrance The side gradually decreases toward the opposite side to make its cross section be wedge-shaped; a second light guide plate has a second light incident side, and the thickness of the second light guide plate decreases from the second light incident side toward the opposite side to make it The cross section is wedge-shaped; the second light guide plate is provided on the bottom side of the first light guide plate and is integrated into one, and the first light incident side and the second light incident side are oppositely arranged; a reflective structure is provided on the The bottom side of the second light guide plate; a first light bar, corresponding to the first light incident side, to provide light to the first light guide plate; and a second light bar, corresponding to the second light incident side, to provide The light is given to the second light guide plate; thereby, the light of the first light bar and the second light bar are guided by the first light guide plate and the second light guide plate respectively to emit light on the light exit surface, and control The driving states of the first light bar and the second light bar achieve section dimming.     The edge-lit backlight module with segment light output control as described in item 1 of the patent application scope, wherein when the specifications of the first light bar and the second light bar are the same, the first light bar is subject to the first The light brightness of the light emitted from the light exit surface guided by the light guide plate is L ₁ , the light brightness of the light emitted from the light exit surface guided by the second light guide plate is L ₂ , and the light exit surface has It is the light output brightness of L ₁ + L ₂ , L ₁ , L ₂ and 0.     The edge-lit backlight module with section light output control as described in item 1 of the patent scope, wherein the first light bar has a plurality of first light sources, the second light bar has a plurality of second light sources, and the light exit surface A plurality of light-emitting control areas are divided, each of the light-emitting control areas is perpendicular to the first light-incident side and arranged adjacent to each other, and each of the light-emitting control areas corresponds to at least one first light source and at least one second light source.         The side-entry backlight module with section light output control as described in item 1 of the patent application scope, wherein the first light guide plate is provided with a first uniform light microstructure group on the light output surface.         The side-entry backlight module with segment light output control as described in Item 1 of the patent application scope, wherein the second light guide plate is provided with a second uniform light microstructure group on a bottom surface.         A display device with section light emission control, including: a liquid crystal panel; and a side-entry backlight module, which is provided on one side of the liquid crystal panel and includes: a first light guide plate having a first light-entering side and a A light exit surface, and the thickness of the first light guide plate gradually decreases from the first light incident side toward the opposite side to make its cross section be wedge-shaped; a second light guide plate has a second light incident side, and the second light guide The thickness of the light plate is gradually reduced from the second light incident side toward the opposite side to make its cross section into a wedge shape; the second light guide plate is disposed on the bottom side of the first light guide plate and assembled into one body, and the first light incident side And the second light incident side is oppositely arranged; a reflective structure is arranged on the bottom side of the second light guide plate; a first light bar is arranged corresponding to the first light incident side to provide light to the first light guide plate; And a second light bar, corresponding to the second light incident side, to provide light to the second light guide plate; thereby, the light of the first light bar and the second light bar are respectively received by the first light guide plate and The second light guide plate guides and emits light on the light exit surface, and achieves section dimming by controlling the driving states of the first light bar and the second light bar.     The display device with section light output control as described in item 6 of the patent application scope, wherein, when the specifications of the first light bar and the second light bar are the same, the first light bar is guided by the first light guide plate The light brightness from the light exit surface is L ₁ , the second light bar is guided by the second light guide plate and the light brightness from the light exit surface is L ₂ , and the light exit surface has L ₁ + The brightness of L ₂ , L ₁ , L ₂ and 0.     The display device with section light output control as described in item 6 of the patent application range, wherein the first light bar has a plurality of first light sources, the second light bar has a plurality of second light sources, and the light output surface is divided into a plurality of light outputs In the control regions, each of the light output control regions is perpendicular to the first light incident side and arranged adjacent to each other, and each of the light output control regions corresponds to at least one first light source and at least one second light source.         The display device with section light output control as described in item 6 of the patent application scope, wherein the first light guide plate is provided with a first light-equalizing microstructure group on the light output surface.         The display device with section light output control as described in item 6 of the patent application scope, wherein the second light guide plate is provided with a second uniform light microstructure group on a bottom surface.