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Liquid crystal display device

A technology of liquid crystal display device and liquid crystal display panel, which is applied to lighting devices, fixed lighting devices, components of lighting devices, etc., can solve the problems of increasing the burden on the earth's environment, and achieve the effect of small size

Active Publication Date: 2011-09-21
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since mercury vapor is sealed inside the fluorescent tube, the burden on the global environment is increased, and its use tends to be banned in Europe and other places.

Method used

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  • Liquid crystal display device
  • Liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] figure 1 It is an exploded perspective view of a liquid crystal display device. figure 1 Divided into a liquid crystal display panel 10 and a backlight source. exist figure 1 Among them, the TFT substrate 11 on which the display area, scanning lines, image signal lines, etc., in which TFTs and pixel electrodes are arranged in a matrix, is formed, and the counter substrate 12 on which color filters, etc. are formed are bonded by an adhesive (not shown). . Liquid crystal (not shown) is interposed between the TFT substrate 11 and the counter substrate 12 .

[0068] A lower polarizing plate 14 is attached to the lower side of the TFT substrate 11 , and an upper polarizing plate 13 is attached to the upper side of the counter substrate 12 . A member in a state where the TFT substrate 11 , the counter substrate 12 , the lower polarizing plate 14 , and the upper polarizing plate 13 are bonded is referred to as a liquid crystal display panel 10 . A backlight is arranged on...

Embodiment 2

[0092] In Example 1, LED30 was arrange|positioned on 1 straight line. In this case, as Figure 5As shown, a dark portion 50 is generated around a portion where the light of the LED 30 is not irradiated. Such a dark portion 50 may become uneven brightness on the screen. In this embodiment, the area of ​​the dark portion 50 is reduced by shifting the positions of every other LED 30 arranged in a straight line, thereby reducing brightness unevenness.

[0093] Figure 13 It is a schematic diagram which shows the arrangement|positioning of LED30 of this Example, and the emission area|region of light. Such as Figure 13 As shown, the LED 30 is formed with a shift S in the direction of emitting light. and Figure 5 It can be seen from comparison that by forming the offset S, the area of ​​the dark portion 50 to which the light from the LED 30 is not irradiated can be greatly reduced. exist Figure 13 , the first LEDs are arranged on the first line, and the second LEDs are arr...

Embodiment 3

[0097] In Example 1 and Example 2, a so-called side view type LED 30 that emits light from a lateral direction is used as the LED 30 . This embodiment is a structure in which a so-called top-view LED 30 that emits light from above the LED 30 is used as a backlight for the LED 30 .

[0098] The structure of the liquid crystal display device and the figure 1 The structure of the description is the same. In addition, the light guide plate 20 used is the same as that used in figure 2 The same as the light guide plate described in . embed figure 2 The LED 30 in the concave portion 21 of the light guide plate 20 shown is a top-view type. Figure 18 A plan view showing a light source embedded in the concave portion 21 of the light guide plate 20 . exist Figure 18 In this case, the wiring substrate 31 made of glass epoxy on which wiring is formed is pasted on both sides of the Al substrate 35 . LED30 is arrange|positioned on the wiring board 31. As shown in FIG. Such a stru...

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PUM

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Abstract

The present invention enables a liquid crystal display device using LEDs as a light source to reduce uneven brightness, increase efficiency of heat discharged from the LEDs, and provide area brightness control. The liquid crystal display device includes a liquid crystal display panel and a backlight. The backlight includes a light guide panel and a plurality of LEDs arranged on a line. The light guide panel includes a concave portion extending in a longitudinal direction of the light guide panel. A large number of LEDs are placed in the concave portion of the light guide panel. The plurality of LEDs arranged on a line emit light alternately in opposite directions. This configuration allows for uniform brightness distribution without forming a large number of concave portions in the light guide panel. Further, this configuration also allows for area brightness control by controlling a large number of LEDs by group.

Description

technical field [0001] The present invention relates to a liquid crystal display device using LEDs as a backlight, and more particularly to a liquid crystal display device with high utilization efficiency of light from a light source and less uneven brightness. Background technique [0002] In the liquid crystal display device, there are provided a TFT substrate in which pixel electrodes and thin film transistors (TFTs) are formed in a matrix; As for the substrate, liquid crystal is interposed between the TFT substrate and the counter substrate. Furthermore, an image is formed by controlling the transmittance of light by liquid crystal molecules for each pixel. [0003] Since the liquid crystal display device can be made light and thin, the liquid crystal display device is used in various fields. Liquid crystal itself does not emit light, so a backlight is arranged on the back of the liquid crystal display panel. Fluorescent tubes are used as backlights in large-screen li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357F21S8/00F21V8/00F21V19/00F21Y101/02
CPCG02F1/133611G02B6/0068G02B6/0083G02F1/133603G02B6/0021
Inventor 久保田秀直岩佐浩崎田康一
Owner MAXELL HLDG LTD
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