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Liquid crystal display device

Inactive Publication Date: 2013-06-20
TRIVALE TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a liquid crystal display device that includes a front panel and a resin layer between the front panel and the display panel. The invention aims to prevent display nonuniformity in high-temperature environments. By using the resin layer, the invention suppresses the gathering of liquid crystal in certain parts of the panel, resulting in a uniform display and improved visual quality. The distance between the substrates of the display panel is held uniform, which helps to achieve a consistent display across the entire screen.

Problems solved by technology

In that case, when an air layer exists between the display panel and the protective plate, there occurs a problem in that extraneous light incident from the front surface side of the display panel is reflected on the front and rear surfaces of the protective plate and the front surface of the display panel, to cause deterioration in visibility.
In the liquid crystal display device having the structure in which the front panel such as the touch panel is adhered to the front surface of the display panel (liquid crystal panel) with the resin layer interposed therebetween, there has been a problem in that display nonuniformity is likely to occur in a peripheral part of the liquid crystal panel in a high-temperature environment.
In particular, the expanded liquid crystal is likely to flow to the peripheral part of the liquid crystal panel and an amount of the liquid crystal increases in the peripheral part of the liquid crystal panel, thereby causing a cell gap (thickness of the liquid crystal layer) in that portion to become abnormal.

Method used

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Examples

Experimental program
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first preferred embodiment

[0027]FIG. 1 is a view showing a configuration of a principle part of a liquid crystal display device according to a first preferred embodiment of the present invention. As in FIG. 1, a display panel (liquid crystal panel) of the liquid crystal display device has a structure in which a liquid crystal 3 is held between a thin-film transistor (TFT) array substrate 1 and a color filter (CF) substrate 2 arranged on a front surface (display surface) side thereof as opposed thereto.

[0028]Although not illustrated, the TFT array substrate 1 is formed by providing, on a transparent substrate such as glass, a pixel electrode of each pixel, a TFT for supplying an image signal to each pixel electrode, a gate wire (scanning signal line) for supplying a drive signal to a gate electrode of each TFT, a source wire (image signal line) for supplying an image signal to a source electrode of the TFT, and the like. Further, the CF substrate 2 is formed by providing, on the rear-side surface (surface opp...

second preferred embodiment

[0049]FIG. 7 is a view showing a configuration of a liquid crystal display device according to a second preferred embodiment. In the present preferred embodiment, the configuration is formed in which the resin layer 7 between the front panel 8 and the liquid crystal panel extends to the above of the peripheral seal 4 of the liquid crystal panel. Other configurations are similar to those of the first preferred embodiment, and descriptions thereof are thus omitted herein.

[0050]In the present preferred embodiment, since the whole of the region filled with the liquid crystal 3 is covered by the resin layer 7, a force of the resin layer 7 to push down the CF substrate 2 at the time of thermal expansion of the resin layer 7 is applied almost uniformly to the whole of the liquid crystal 3. Hence, the liquid crystal 3 is prevented from gathering in the peripheral part of the liquid crystal panel. This can result in prevention of the cell gap G in the peripheral part of the liquid crystal pa...

first modified example

[0052]As described in the first preferred embodiment with reference to FIG. 2, the liquid crystal 3 is likely to flow in the gravity direction, and the cell gap G is likely to increase especially in the lower side part of the liquid crystal panel. For this reason, in the liquid crystal display device according to the second preferred embodiment, it is possible to suppress an increase in the cell gap G in the peripheral part of the liquid crystal panel at least when the resin layer 7 extends to the above of the peripheral seal 4 in the gravity direction.

[0053]Therefore, as shown in FIG. 8, the end of the resin layer 7 on the opposite side to the gravity direction (upper side) may be configured so as not to extend to the above of the peripheral seal 4. In this case, the liquid crystal 3 is more likely to flow to the upper side portion of the liquid crystal panel, but when the cell gap G increases and the compressive deformation amount ΔLa of the main spacers 5a comes close to zero, th...

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Abstract

A liquid crystal display device includes: a display panel which includes a TFT array substrate and a CF substrate arranged as opposed to each other, and a liquid crystal held therebetween; and a front panel which is adhered to a front surface side of the display panel with a resin layer interposed therebetween. A display region of the display panel is provided with main spacers formed on the CF substrate and making contact with the TFT array substrate, and sub-spacers formed on the CF substrate and not reaching the TFT array substrate. A ratio of a total contact area of the main spacers and the TFT array substrate with respect to an area of the display region of the liquid crystal panel is equal to or smaller than 0.02%.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a liquid crystal display device formed by providing a protective plate or a touch panel on a front surface side of a display panel.[0003]2. Description of the Background Art[0004]For example, in a liquid crystal display device for outside installation, a transparent protective plate (protective cover) made of a resin or glass is provided on a front surface (display surface) of a display panel for the purpose of protecting the display panel from an outside shock, and the like. In that case, when an air layer exists between the display panel and the protective plate, there occurs a problem in that extraneous light incident from the front surface side of the display panel is reflected on the front and rear surfaces of the protective plate and the front surface of the display panel, to cause deterioration in visibility. Thus, the space between the display panel and the protective plate may b...

Claims

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Application Information

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IPC IPC(8): G02F1/1339G02F1/1333
CPCG02F1/133308G02F2001/13396G02F1/13394G02F1/1339G02F1/13396
Inventor YONEMURA, KOJIUMEDA, HIROSHI
Owner TRIVALE TECH LLC
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