JPH04286492A - television receiver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver capable of adjusting images according to the viewer's preferences.

0002

[Prior Art] Conventionally, television receivers were
As disclosed in Publication No. 55492, by adjusting the inverse gamma correction amount of the video signal for R, G, and B independently, the desired correction amount can be obtained for each, and a uniform white balance can be achieved regardless of the brightness. It displays clear and natural images. By the way, conventionally, in television receivers using liquid crystal display elements, for example, image adjustment has been performed using the same classification of items as in cathode ray tube television receivers, such as image, color tone, color saturation, black level, and image quality. I was worried.

0003

[Problem to be Solved by the Invention] However, in such conventional image adjustment, it is not possible to fully bring out the display characteristics of the liquid crystal display element of a liquid crystal television receiver, which is different from a cathode ray tube television receiver. As a result, there was a problem in that it was not possible to adjust the image according to the viewer's preferences. Therefore, the present invention has been made in consideration of the above circumstances, and its purpose is to provide a television that enables image adjustment according to the viewer's preference by fully bringing out the display characteristics of the display element. The purpose is to provide a television receiver.

0004

[Means for Solving the Problems] In order to achieve the above object, the television receiver according to the present invention includes a first storage means storing display characteristic data of a display element;
a second storage means for storing amplitude characteristics in which a plurality of brightness levels of the video signal are set for each area based on user control; a switching means for switching between the first and second storage means; and a brightness level of the video signal. The present invention is characterized by comprising a gain control circuit that can control the gain according to the level.

[0005]

[Operation] In the present invention having the above structure, the gain control circuit controls the amplitude of the video signal in accordance with the luminance level of the video signal. Therefore, the video signal whose gain is controlled by the amplitude characteristic that most closely approximates the display characteristic of the display element not only faithfully reproduces the transmitted original image, but also enables image adjustment according to the viewer's preference.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 and 2. FIG. 1 shows an embodiment of a television receiver according to the present invention, in which a liquid crystal display element is used as a display element. In FIG. 1, a gain control circuit 1 is supplied with a video input signal a and a gain control signal b, and obtains a video output signal c whose gain is controlled according to the brightness level of the video input signal a and the gain control signal b. .

On the other hand, the amplitude characteristic that is most similar to the display characteristic data of the liquid crystal display element is stored in the first storage means RO as a factory default value based on the display characteristic data of the liquid crystal display element.
Store it in M (read only memory) 2. The amplitude characteristics by adjusting the image according to the viewer's preferences, that is, the amplitude characteristics in which multiple brightness levels of the video signal are set for each area based on user control, are stored in RAM (Random Access Memory) as a second storage means. 3
The signals from the ROM2 and RAM3 can be switched by a ROM/RAM switching circuit 4 as switching means. Then, the data interpolation circuit 5 interpolates data between the dark part, the halftone part, and the bright part of the video of the amplitude characteristic based on the image adjustment made by the viewer.

Here, the image adjustment method performed by the viewer is as follows:
As shown in Figure 2, the amplitude characteristics can be roughly divided into dark areas, midtone areas, and bright areas of the image, and adjustments can be made by moving each area closer to the darker side or closer to the brighter side. Make it easy. In the above configuration, the data interpolation circuit 5 interpolates data between the dark part, the halftone part, and the bright part of the video of the amplitude characteristic based on the image adjustment made by the viewer, and stores this data in the RAM 3. When the RAM 3 is selected by the ROM/RAM switching circuit 4, an image adjusted by the viewer is displayed.

As described above, according to the present embodiment, the display characteristics of the liquid crystal display element are fully brought out by the gain control circuit 1 whose gain can be controlled according to the brightness level of the video signal, and an image according to the viewer's preference can be produced. Adjustment is possible. Note that the present invention is not limited to a liquid crystal television receiver using a liquid crystal display element as in the above embodiment, but can also be applied to an EL display element or a plasma display element by controlling the gain according to the display characteristics specific to the display element. It can be applied to video signal processing for all kinds of display elements.

0010

As explained above, according to the television receiver of the present invention, the display characteristics of the display element can be fully brought out by the gain control circuit whose gain can be controlled according to the brightness level of the video signal. Image adjustments can be made according to the viewer's preferences.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a television receiver according to the present invention.

FIG. 2 is a graph diagram showing the amplitude characteristics of the same example.

[Explanation of symbols]

1 Gain control circuit 2 ROM (first storage means) 3 RAM (second storage means) 4 ROM/RAM switching circuit (switching means) 5 Data interpolation circuit

Claims (1)

[Claims] 1. A first storage means that stores display characteristic data of a display element; and a second storage means that stores amplitude characteristics in which a plurality of brightness levels of a video signal are set for each region based on user control. A television receiver comprising: switching means for switching between the first and second storage means; and a gain control circuit capable of controlling gain according to the brightness level of the video signal.