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Liquid crystal display device

A technology of liquid crystal display devices and liquid crystal display elements, which is applied to static indicators, instruments, etc., can solve the problems of responsiveness degradation, uneven display, etc., and achieve the effect of suppressing uneven display

Inactive Publication Date: 2006-07-12
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, when the timing of turning off the light source is synchronized with the end timing of the second data scan, in a liquid crystal display device using a liquid crystal material having spontaneous polarization such as a ferroelectric liquid crystal or an antiferroelectric liquid crystal having excellent responsiveness , there is a problem that there is a high possibility of display unevenness from the start area (upstream) to the last area (downstream) of data scanning due to deterioration of responsiveness due to temperature drop

Method used

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  • Liquid crystal display device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0046] figure 2 is a block diagram showing the circuit configuration of the liquid crystal display device according to Embodiment 1, image 3 is a schematic cross-sectional view of a liquid crystal panel and a backlight, and Figure 4 It is a schematic diagram showing an example of the overall configuration of a liquid crystal display device.

[0047] exist figure 2 Among them, 21 and 22 indicate that the cross-sectional structure is shown in image 3 LCD panel and backlight. The backlight 22 is composed of an LED array 7 and a light guide and light diffusion plate 6 . like image 3 and Figure 4 As shown, the liquid crystal panel 21 is composed of sequentially stacking a polarizing film 1, a glass substrate 2, a common electrode 3, a glass substrate 4, and a polarizing film 5 from the upper (surface) side to the lower (back) side. Pixel electrodes 40 , 40 . . . arranged in a matrix are formed on the surface of the electrode 3 side.

[0048] Between these common elec...

Embodiment approach 2

[0066] Figure 9 It is a block diagram showing a circuit configuration of a liquid crystal display device according to Embodiment 2 of the present invention. exist Figure 9 in, for with figure 2 The same parts are given the same reference numerals, and their descriptions are omitted.

[0067] In Embodiment 1, the driving sequence is switched according to the temperature of the liquid crystal panel 21 , but in Embodiment 2, the driving sequence is switched according to the response time of the liquid crystal panel 21 from the transmissive state to the light-shielding state.

[0068] exist Figure 9 Among them, 37 is an optical sensor arranged in the liquid crystal panel 21. The optical sensor 37 detects the response time of the liquid crystal panel 21 from the transmissive state to the light-shielding state and outputs the detection result to the backlight control circuit 35. Specifically, set at predetermined intervals (for example, 30s intervals) figure 1 In the drivin...

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PUM

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Abstract

A color display is performed by carrying out a switching between a first driving system in which the OFF timing of a light source and the end timing of a data scanning agree with each other and a second driving system in which the OFF timing of a light source and the end timing of a data scanning do not agree with each other. In case where a response time of a liquid crystal from a transmission state to a light-shielding state is sufficiently short, a color display is performed by using the first driving system to decrease a light-emitting time of a light source. On the other hand, in case where the response time of the liquid crystal from the transmission state to the light-shielding state is increased, a color display is performed by using the second driving system.

Description

technical field [0001] The present invention relates to a liquid crystal display device of a field sequential method or a color filter method. Background technique [0002] With the development of the so-called information society in recent years, electronic devices typified by personal computers, PDAs (Personal Digital Assistants), and the like are increasingly used. With the spread of such electronic devices, there is a demand for portable devices that can be used both in offices and outdoors, and miniaturization and weight reduction thereof are urgently required. Liquid crystal display devices are widely used as one of the means for achieving this purpose. A liquid crystal display device is an essential technology not only for reducing the size and weight but also for reducing power consumption of battery-driven portable electronic devices. [0003] Liquid crystal display devices are roughly classified into two types, reflective type and transmissive type. The reflecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/34
CPCG09G2310/061G09G2310/0235G09G2320/041G09G2330/021G09G2310/08G09G3/3406G09G2310/024
Inventor 吉原敏明牧野哲也只木进二白户博纪清田芳则笠原滋雄别井圭一
Owner FUJITSU LTD