KR20180014319A - Curved display device - Google Patents

Abstract

The present invention relates to a curved display device, wherein a display panel of a curved display device according to the present invention includes at least one boundary black matrix located at a boundary between at least two active areas, The line width of the inner black matrix is different and the brightness of adjacent boundary sub-pixels is adjusted by interposing the boundary black matrix to reduce the luminance deviation of the adjacent inner sub-pixels and the boundary sub-pixels via the inner black matrix.

Description

[0001] CURVED DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION Field of the Invention [0002] The present invention relates to a curved display device, and more particularly to a curved display device capable of preventing image quality deterioration.

The image display device that realizes various information on the screen is a core technology of the information communication age and it is becoming thinner, lighter, more portable and higher performance. Accordingly, a flat panel display device capable of reducing weight and volume, which is a disadvantage of a cathode ray tube (CRT), has attracted attention.

A flat panel display generally displays an image on a flat screen, but a curved display device having a certain radius of curvature has recently been proposed to further satisfy various functions.

However, the curved display device has a problem that the image quality characteristic is deteriorated due to warping of the flexible display panel.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a curved display device capable of preventing deterioration of image quality.

In order to achieve the above object, a curved display panel of a curved display device according to the present invention includes at least one boundary black matrix positioned at a boundary between at least two active areas, and an inner black The linewidth of the matrix is different and the brightness of neighboring boundary sub-pixels is adjusted by interposing the boundary black matrix, thereby reducing the brightness deviation of the adjacent internal sub-pixels and the boundary sub-pixels with the inner black matrix interposed therebetween.

In the present invention, the brightness of the boundary sub-pixels located on both sides of the boundary black matrix having a relatively small width is lower than the brightness of the internal sub-pixels located on both sides of the inner black matrix having a relatively large width The luminance deviation can be minimized. Accordingly, it is possible to prevent the band pattern generated due to the luminance deviation from being recognized.

FIG. 1A is a view for explaining the light leakage phenomenon of the curved display device according to the prior art of the present invention, and FIG. 1B is a view for explaining the phenomenon of banding unevenness of the curved display device according to the prior art of the present invention.
2 is a block diagram showing a curved display device according to the present invention.
FIG. 3 is a view for explaining each sub-pixel of the curved display panel shown in FIG. 2. FIG.
4 is a plan view showing a black matrix of the curved display panel shown in Fig.
FIG. 5 is a view for explaining a luminance relationship adjusted according to a line width in the black matrix shown in FIG.
6 is a block diagram for explaining the configuration of the image processing unit shown in FIG.
7 is a plan view showing another embodiment of the black matrix shown in Fig.
8 is a plan view showing another embodiment of the sub pixel arrangement of the curved display panel of the present invention.
FIG. 9 is a view for explaining luminance weights applied according to the sub-pixel arrangement shown in FIG.

Prior to the description of the embodiments of the present invention, the image quality degradation phenomenon of the curved display device according to the prior art of the present invention will be described first.

FIG. 1A is a view for explaining the light leakage phenomenon of the curved display device according to the prior art of the present invention, and FIG. 1B is a view for explaining the phenomenon of banding unevenness of the curved display device according to the prior art of the present invention.

The length of the arc corresponding to the length of the surface of the upper substrate 11 of the curved display panel is smaller than the length of the arc corresponding to the length of the surface of the lower substrate 1, as shown in Fig. In this case, the data line 20 and the black matrix 30 located in the central region of the curved display panel are completely overlapped with each other. However, since the data lines 20 and the black matrix 30 except for the central region of the curved display panel do not overlap or overlap each other, light leakage occurs.

1B, the line width Wc of the black matrix 30 overlapped with the data line 20 located in the central region of the curved display panel is overlapped with the remaining data line 20 The line width Wp of the black matrix 30 is set to be wide so that light leakage can be prevented from being generated.

In this case, the distance between the left and right sub-pixels near the black matrix 30 located in the central area of the curved display panel becomes closer. As a result, the luminance overlap between the adjacent sub-pixels sandwiching the data line 20 located in the central area of the curved display panel and the black matrix 30 overlapping is greater than the other areas as shown in FIG. 1B, The brightness of neighboring sub-pixels is higher than that of other sub-pixels with the black matrix 30 located in the region between the sub-pixels.

In order to solve the problems of the prior art, the curved display device according to the present invention suggests a method of improving picture quality by compensating the luminance of the sub-pixels according to the line width of the black matrix.

2 is a block diagram showing a curved display device according to the present invention.

2 includes a curved display panel 100, a data driver 108, a scan driver 106, a timing controller 110, and an image processing unit 120. [ Here, the timing controller 110, the data driver 108, and the scan driver 106 may be represented by a display driver for driving the curved display panel 100.

The timing controller 110 controls the timing of the data driver 108 using a plurality of synchronizing signals input from the image processor 120, that is, a vertical synchronizing signal Vsync, a horizontal synchronizing signal Hsync, a data enable signal, A data control signal DCS for controlling the drive timing and a scan control signal SCS for controlling the drive timing of the scan driver 106 are generated. The timing controller 110 outputs the generated data control signal DCS and the scan control signal SCS to the data driver 108 and the scan driver 106, respectively. The data control signal DCS includes a source start pulse and a source sampling clock for controlling the latch of the data signal, a polarity control signal for controlling the polarity of the data signal, a source output enable signal for controlling the output period of the data signal, . The scan control signal SCS includes a scan start pulse and a scan shift clock for controlling scanning of a scan signal, and a scan output enable signal for controlling an output period of the scan signal.

The scan driver 106 sequentially drives the scan lines SL of the display panel 100 in response to a scan control signal from the timing controller 110. The scan driver 106 supplies a scan pulse in a high state for each scan period of each scan line SL and a scan pulse in a low state during the remaining period in which the scan line SL is driven.

The data driver 108 converts the digital data DATA from the timing controller 110 into analog data voltages in response to the data control signal DCS from the timing controller 110 and supplies the analog data voltages to the respective scan lines SL And supplies it to the data line DL every time.

The curved display panel 100 displays an image through unit pixels arranged in a matrix form. The unit pixel may be composed of red (R), green (G) and blue (B) sub-pixels as shown in FIG. 3, or may be composed of red (R), green (G), blue (B) Pixels. As the curved display panel 100, a liquid crystal display panel, an organic light emitting display panel, or the like can be used. In the present invention, an organic light emitting display panel will be described as an example.

The curved display panel 100 is divided into two active areas in which a plurality of sub-pixels are arranged as shown in FIG.

Each sub-pixel disposed in the light emitting region in the active regions includes an organic light emitting device OLED that emits light according to a data signal of an input image as shown in FIG. 3, a pixel circuit Respectively. The pixel driving circuit supplies a data current corresponding to a data signal supplied to the data line DL to the organic light emitting diode OLED in response to a scan signal supplied to the scan line SL. To this end, the pixel driver circuit includes a switching transistor Tr_S, a driving transistor Tr_D, and a capacitor C. The switching transistor Tr_S is switched according to a scan signal supplied to the scan line SL to supply a data signal to the data line DL to the drive transistor Tr_D. The driving transistor Tr_D is switched in accordance with the data signal supplied from the switching transistor Tr_S to control the current flowing from the high potential power supply VDD to the organic light emitting element OLED. The capacitor C is connected between the gate terminal of the driving transistor Tr_D and the organic light emitting diode OLED and stores a voltage corresponding to a data signal supplied to the gate terminal of the driving transistor Tr_S, (Tr_D) is kept constant for one frame. Here, the configuration of the pixel driving circuit shown in FIG. 3 is only one embodiment, but it is not limited thereto.

The organic light emitting element OLED is electrically connected between the source terminal of the driving transistor Tr_D and the low potential power supply VSS and emits light by a current corresponding to the data signal supplied from the driving transistor Tr_D. To this end, the organic light emitting device OLED includes an anode electrode connected to the source terminal of the driving transistor Tr_D, an organic layer formed on the anode electrode, and a cathode electrode formed on the organic layer. Here, the organic layer may include a hole injection layer / a hole transporting layer / a light emitting layer / an electron transporting layer / an electron injection layer.

Thus, each of the red (R), green (G) and blue (B) sub-pixels is driven by the switching of the driving transistor Tr_D in accordance with the data signal to flow from the high potential power source VDD to the organic light emitting element OLED And controls the magnitude of the current to cause the light emitting layer of the organic light emitting diode OLED to emit light.

A boundary black matrix BMb is disposed at the center of the curved display panel 100 which is a boundary between two active areas of the curved display panel 100 and an inner black matrix BMi is disposed within the active areas do. The black matrixes BMb and BMi are overlapped with the scan lines SL and the data lines DL to separate the sub pixel regions and prevent optical interference and light leakage between adjacent sub pixel regions.

The boundary black matrix BMb and the inner black matrix BMi are formed to have different widths from each other to prevent light leakage. That is, the width W2 of the boundary black matrix BMb is formed to be narrower than the width W1 of the inner black matrix BMi as shown in Figs. Accordingly, when the distances of the left and right adjacent boundary sub-pixels SPb are close to each other across the boundary black matrix BMb so that the brightness of the boundary sub-pixels SPb is higher than that of the other internal sub-pixels SPi, A perceived phenomenon occurs.

In order to solve this problem, in the present invention, as shown in FIG. 5, the brightness of the boundary sub-pixels SPb adjacent to each other with the boundary black matrix BMb therebetween is supplied to the internal sub-pixels SPi through the image processing unit 120, The luminance deviation can be minimized by lowering the luminance by a predetermined level.

The image processing unit 120 processes the input image data supplied from the host computer and supplies the processed image data to the timing controller 110. The image processing unit 120 is integrated in the timing controller 110 and integrated with the timing controller 110 into one IC or is disposed between the timing controller 110 and a host computer 110 < / RTI >

The image processing unit 120 adjusts the luminance of the image data to be supplied to the sub pixels located in the active regions according to at least one of the line widths of the boundary black matrix BMb and the inner black matrix BMi. That is, the image processing unit 120 lowers the brightness of the image data to be supplied to the boundary sub-pixels SPb and outputs the brightness to the timing controller 110. [ 6, the image processing unit 120 includes a data classification unit 122, a luminance extraction unit 124, a luminance correction unit 126, and a data correction unit 128. [

The data classification unit 122 divides the input image data into boundary image data to be supplied to the boundary sub-pixels SPb adjacent to the right and left with the boundary black matrix BMb therebetween and internal image data to be supplied to the internal sub- Data. The classified internal image data is directly transmitted to the timing controller 110 without data modulation, and the classified boundary image data is transmitted to the luminance extracting unit 124.

The luminance extraction unit 124 calculates luminance data and color difference data from the input boundary image data. The color difference data of the calculated boundary image data is transmitted to the data correction unit 128, and the luminance data of the calculated boundary image data is transmitted to the luminance correction unit 126.

The luminance correction unit 126 multiplies the luminance data Pcl and Pcr of the input boundary image data by luminance weights as shown in Equations 1 and 2 and applies the gamma values suitable for the respective sub-pixels to obtain the low luminance data Pcl 'and Pcr' ).

In Equation (1), Pc1 is the luminance data of the boundary image data to be supplied to the boundary sub-pixel SPb located on the left side of the boundary black matrix BMb, and Pcr (m, n) Is the luminance data of the boundary image data to be supplied to the boundary sub-pixel SPb located on the right side of the boundary pixel BMb. In the equations (1) and (2), when the luminance correction section 126 generates low luminance data,? And? Are luminance weight values having a value smaller than 1, and when the luminance correction section 126 generates high luminance data , and? and? are luminance weights having values greater than one.

At this time, the luminance weights alpha and beta are determined by a function proportional to the width of the black matrix located between the sub-pixels. For example, when the width W2 of the boundary black matrix BMb is smaller than the width W1 of the inner black matrix BMi, it is supplied to the adjacent boundary subpixel SPb through the boundary black matrix BMb The luminance weight (alpha, beta) to be applied to the boundary data to be set is set to a value smaller than one. When the width W2 of the boundary black matrix BMb is larger than the width W1 of the inner black matrix BMi, the boundary to be supplied to the adjacent boundary subpixel SPb through the boundary black matrix BMb The luminance weight (alpha, beta) to be applied to the image data is set to a value larger than one.

When the light emission area or the width of the adjacent boundary sub-pixels SPb with the boundary black matrix BMb therebetween is the same, the boundary sub-pixels SPb located on the left and right of the boundary black matrix BMb, The luminance weight values? And? To be applied to the boundary image data to be supplied to the boundary image data are set to be equal to a value smaller than 1. When the light emission area or width of the adjacent boundary sub-pixels SPb are different with respect to the boundary black matrix BMb, the boundary sub-pixels SPb located on the left and right of the boundary black matrix BMb The luminance weight (alpha, beta) to be applied to the boundary image data to be supplied is set to a different value smaller than one. At this time, the luminance weight is set to be in inverse proportion to the area (width) of adjacent boundary sub-pixels sandwiching the boundary black matrix BMb. When the width of the boundary sub-pixel SPb located on the left side of the subpixel black matrix BMb is smaller than the width of the boundary subpixel SPb located on the right side, the luminance weight applied to the left subpixel SPb is the right Is set to be larger than the luminance weight applied to the boundary sub-pixel SPb.

Therefore, the luminance correction unit 126 can lower the luminance data of the boundary sub-pixel SPb adjacent to the boundary black matrix BMb than the luminance data of the internal sub-pixels SPi.

The data correction unit 128 calculates the boundary image data corrected through the luminance data and the color difference data from the luminance correction unit 126. [ The calculated boundary image data is output to the timing controller 110 together with the internal image data classified by the data classification unit 122.

As described above, the curved display device according to the present invention can minimize the luminance deviation of the brightness of the boundary sub-pixels SPb located on both sides of the boundary black matrix BMb having a relatively small width.

In the meantime, although the first embodiment of the present invention has been described by exemplifying that the curved display panel is divided into two active areas, it may be divided into two or more active areas as shown in FIG.

8 is a view showing sub-pixels arranged in each active area of a curved display panel according to a second embodiment of the present invention.

The curved display device according to the second embodiment of the present invention shown in Fig. 8 is different from the curved display device shown in Fig. 4 in that the line width of the internal black matrix disposed in the active area is the same, Except that the line width of the black matrix is different. Accordingly, detailed description of the same elements will be omitted.

A unit pixel disposed in each active area of the curved display panel 100 shown in FIG. 8 is formed in a quad structure using four sub-pixels. Sub-pixels having different colors are sequentially arranged in the first vertical line of the curved display panel 100, and sub-pixels arranged in the first vertical line from the first vertical line to the last vertical line are arranged in a downward direction Are arranged to be shifted by two columns. Accordingly, the odd-numbered vertical lines are repeatedly arranged in the order of white (W), blue (B), green (G) and red Sub pixels are arranged in order of green (G), red (R), white (W), and blue (B) subpixels so that the subpixels arranged in the subpixels are shifted in two rows in the downward direction.

At this time, the width of the inner black matrix BMi between upper and lower neighboring sub-pixels disposed in each active region is constant, but the width of the inner black matrix BMi between the adjacent sub-pixels is different for each sub-pixel .

Accordingly, the curved display device according to the second embodiment of the present invention is not limited to the area (width) of the boundary sub-pixel that varies depending on the line width of the boundary black matrix BMb, The luminance weight is varied according to the area (width) of the internal sub-pixel.

That is, when the area (width) of the sub pixel located at one side with the internal black matrix BMi therebetween and the area (width) of the sub pixel located at the other side are different from each other, 9, different luminance weights are applied in inverse proportion to the area (width) of the sub-pixel SPi. For example, when the area (width) of the sub pixel located at one side with the internal black matrix BMi therebetween is larger (smaller) than the area (width) of the sub pixel located at the other side, The luminance weight? To be applied to the image data to be supplied to the sub-pixel SPi located on the other side than the luminance weight? To be applied to the image data to be supplied to the sub-pixel SPi. When the area (width) of one sub pixel located on one side and the area (width) of the sub pixel SPi positioned on the other side with the internal black matrix BMi therebetween are the same, (?) To be applied to the image data to be supplied to the image data (SPi).

As described above, the curved display device according to the second embodiment of the present invention can display the brightness of the boundary sub-pixels SPb located on both sides of the boundary black matrix BMb having a relatively small width, The luminance deviation can be minimized by lowering the luminance of the internal sub-pixels SPi located on both sides of the large internal black matrix BMi. Further, in the curved display device according to the second embodiment of the present invention, when the areas (widths) of the internal sub-pixels located on both sides of the internal black matrix are different, the luminance of the internal sub- The luminance deviation can be minimized by lowering the luminance of the internal sub-pixel having a smaller area (width).

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

100: Curved display panel 106: Scan driver
108: Data driver 110: Timing controller
120:

Claims (9)

At least one boundary black matrix which is divided into at least two active areas and which is located at a boundary between the active areas and a curved display panel in which line widths of inner black matrices located in the active areas are different,
And an image processor for adjusting luminance of image data to be supplied to sub pixels located in the active areas according to a line width of at least one of the boundary black matrix and the inner black matrix. The method according to claim 1,
Wherein the at least one boundary black matrix is disposed at the center of the curved display panel. The method according to claim 1,
Wherein the line width of the boundary black matrix is smaller than the line width of the internal black matrix. The method of claim 3,
Wherein the image processing unit lowers the luminance of the boundary sub-pixels by multiplying luminance data of image data to be supplied to adjacent boundary sub-pixels with the boundary black matrix interposed therebetween by a luminance weight. 5. The method of claim 4,
Wherein the boundary weight of the boundary sub-pixels adjacent to each other with the boundary black matrix interposed therebetween is the same, and the luminance weight applied to each of the sub-pixels located at one side and the other side of the boundary black matrix is the same. 5. The method of claim 4,
Wherein the line widths of adjacent boundary sub-pixels sandwiching the boundary black matrix are different from each other, and luminance weights applied to each of the boundary sub-pixels located at one side and the other side of the boundary black matrix are different from each other. The method according to claim 6,
Wherein the brightness weight is set to be inversely proportional to a line width of the boundary sub-pixels. 5. The method of claim 4,
Wherein the line widths of the adjacent inner sub-pixels are different from each other with the inner black matrix interposed therebetween, and the luminance weights applied to the inner sub-pixels located on one side and the other side of the inner black matrix are different from each other. 9. The method of claim 8,
Wherein the luminance weight is set to be inversely proportional to a line width of the internal sub-pixels.

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