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Color image display device

A display device and color image technology, applied to static indicators, instruments, etc., can solve problems such as miniaturization of difficult display area, unfavorable price, complex structure of control device Q2, etc.

Inactive Publication Date: 2004-06-09
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the high price is unfavorable in terms of application
[0021] In addition, since each segment requires at least three LEDs, the size of the three LEDs becomes the lower limit of the pixel size, making it difficult to miniaturize the display area.
[0022] In addition, full-color tone control is performed by pulse-amplitude modulation driving. Therefore, it is necessary to perform color control on the LED itself and all colors that the LED itself does not have. The structure of the control device Q2 is complicated, and color control cannot be easily performed.
[0023] In addition, in the time-division color liquid crystal display device and its driving method of Conventional Example 3, by not emitting light during the period from the start to the end of the optical response of the liquid crystal, accurate color reproduction is realized when the color is switched. However, due to the Three light sources of R, G, and B are used, so, as in Conventional Example 1, the characteristics of the light source become the characteristics of the image display device, making it difficult to manage color independently of the light source.

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0100] figure 1 It is a block diagram showing Embodiment 1 of the present invention. exist figure 1 Among them, 1 is digital color image data, 2 is a color decomposition circuit for decomposing digital image data 1 into subfields and storing them, 3 is a time stamp circuit for generating various time stamps, and 4 is a shutter for controlling shutter 8 described later. Control circuit, 5 is a light source control circuit that controls the light source 6 described later, 6 is a light source that generates light of multiple colors, 7 is a conversion element that changes the light path of light from the light source 6, and 8 is a light source that blocks passing through the conversion element 7 6 is the light shutter, 9 is the displayed display image.

[0101] Next, the operation of each part of the block diagram will be described. First, the digital color image data 1 has the following three cases, that is, RGB color image data is input in order of dots such as RGBRGB, such...

Embodiment 2

[0133] In the above-mentioned embodiment 1, such as Figure 9 As shown, the ON / OFF of the slice data is reflected on the display time of the slice data. However, the following shows an embodiment in which ON / OFF of the slice data is reflected on the lighting voltage of the light source 6 .

[0134] The light source control circuit 5 of embodiment 2 is in Figure 5 In the driving voltage generation circuit 50 shown, a shutter driving voltage variable function reflecting the clipping level is added.

[0135] Figure 10 An overall timing chart of Embodiment 2 is shown. This time stamp is generated by the time stamp circuit 3 and indicates the time stamp for operating each block. During the period when the data of the 0 line is output from the color separation circuit 2 according to the instruction of the timing circuit 3 (in the figure, the image data is the period of the R0 line, the G0 line, and the B0 line), the common 0 is selected for the common electrode. Such as Figu...

Embodiment 3

[0144] In Embodiments 1 and 2 above, the ON / OFF of the clip data is reflected on the display time of the clip data and the lighting voltage of the light source. However, the ON / OFF of the clip data is reflected on the Shutter 8 drive voltage on the embodiment.

[0145] The shutter control circuit 4 of embodiment 3 is shown in Figure 11. 40 is a limiter circuit. In the limiter circuit 40, if the color part data of 1 field of input is greater than a certain limiter level (Leveln) and less than other limiter levels (Leveln+1), it will be turned on (ON), otherwise it will be cut off (OFF ) to output such binary clip data. The values ​​of Leveln and Leveln+1 vary with the signal of the scaling circuit 3 . As a result, the color component data of one field is divided into a plurality of slice data and output. 41 is a drive circuit. On / off (ON / OFF) control of the shutter 8 is performed based on the on / off (ON / OFF) of the clip data. This circuit converts the voltage level requ...

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PUM

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Abstract

An object of the present invention is to provide a color image display apparatus which can easily display a full-color animation of VGA class and attains reduction in size and lowering of price and which facilitates full-color gradation control. In order to achieve the object, a color image display apparatus includes a shutter control circuit 4 that slices color component data subjected to color separation in accordance with a slice level, a light source control circuit 5 that controls a light source corresponding to the color component data, one or plural light sources 6, a converting device 7 that converts light from the light source to surface light source light, a shutter 8 which makes light of a corresponding pixel pass therethrough and cuts off the light and which is made of liquid crystal as a main material, and a timing circuit 3 that generates operation timings for the shutter control circuit and the light source control circuit, in which the shutter control circuit 4 transfers one line of slice data to the shutter sequentially on a slice level basis, the light source control circuit 5 turns on the light source corresponding to the source data, and the shutter 8 makes the light from the light source, which corresponds to the slice data representing gradation of the pixel, pass therethrough and cuts off the light to display an image.

Description

technical field [0001] The present invention relates to a field continuous color image display device, especially when using few light sources, it can easily display VGA-level full-color moving images, and it is easy to realize small-scale and low-cost liquid crystal drive circuits and light source drive circuits. And a color image display device with full-color tone control. Background technique [0002] Existing example 1. [0003] Figure 32 It is a block diagram of a conventional field continuous type color display device disclosed in, for example, JP-A-9-274471. The light source unit P1 is composed of a red light source R, a green light source G, and a blue light source B, and is turned on by a red lighting signal Lr, a green lighting signal Lg, and a blue lighting signal Lb supplied from a light source driving circuit P8. The shutter unit P2 is driven by the data signal D and the common signal C supplied from the shutter control circuit P9. [0004] Next, the operat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/34G09G3/36
CPCG09G3/3607G09G2310/0235G09G3/2014G09G3/3413G09G3/2077G09G3/2011G09G2320/064G09G2310/0221G09G2320/0633
Inventor 佐藤恒夫古木一朗伊藤广山田敬喜高桥正敏
Owner MITSUBISHI ELECTRIC CORP