JP2001272691A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the number of layers to be formed and to improve the luminance, with respect to a liquid crystal display device. SOLUTION: The liquid crystal display device is equipped with an LCD module 3, an LCD driver 5 disposed on one edge of the upper face of the LCD module 3, a light guide member 4 for the back light disposed facing the lower face of the LCD module 3, a light source 7 for the back light disposed at the end part in the edge side of the above light guide member 4 for the back light, and a reflection and light shielding layer 6 having the light shielding property by the upper face and reflection property by the lower face and disposed on the edge on the lower face of the LCD module 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a COG (Chip On Chip)
More particularly, the present invention relates to a liquid crystal display device that realizes luminance unevenness prevention and malfunction prevention of a liquid crystal driver.

[0002]

2. Description of the Related Art Generally, a backlight is used to enhance the visibility of a liquid crystal display device. Further, a COG type liquid crystal display device having a driving circuit chip mounted on a transparent glass substrate of the liquid crystal display device has been proposed.

FIG. 2 is a sectional view of an example of such a liquid crystal display device. This liquid crystal display device includes a printed circuit board 21 and
An LCD holder / backlight light guide plate 22 provided on a printed circuit board 21 and an LCD module 23 held by the LCD holder / backlight light guide plate 22 are provided.

The LCD module 23 has a four-layer structure including upper and lower two transparent glass substrates 231 and 232 and a polarizing plate and the like stacked on the upper and lower layers, and has a larger glass substrate (in FIG. An LCD driver 24 is mounted on one edge (left edge in the figure) of the upper surface of the lower transparent glass substrate 232, and a light-shielding layer 25 is formed on the back surface thereof.
In addition, a backlight light source 26 composed of an LED is disposed facing the right end of the LCD light guide plate 22 that also functions as an LCD holder. Further, a light-shielding layer for preventing luminance unevenness is provided on the right end of the inner upper surface of a portion acting as a backlight light guide plate in the LCD holder / backlight light guide plate 22.
27, a reflection layer 28 is formed on the inner lower surface for reflecting light emitted from the lower surface of the LCD holder / backlight light guide plate 22 upward to improve luminance.

In the liquid crystal display device configured as described above, the light emitted from the backlight light source 26
The light enters the inside from the right end of the holder / backlight light guide plate 22. Then, part of the light that has entered inside propagates upward and irradiates the display area (portion having four layers) of the LCD module 23 from below. Also, light that has propagated downward to the outside is reflected by the reflective layer 28, and propagates upward to
The 23 display areas are illuminated from below. The light shielding layer 27 prevents light from propagating upward from the vicinity of the backlight light source 26, and prevents the right end of the LCD module 23 from becoming too bright. The light-shielding layer 25 absorbs external light such as sunlight incident on the transparent glass substrate, so that the external light is reflected on the inner lower surface of the transparent glass substrate and the
This prevents a situation in which the vehicle reaches the driver 24 and malfunctions occur.

[0006]

However, in the above-mentioned conventional liquid crystal display device, a light shielding layer 25 for preventing malfunction of the LCD driver, a light shielding layer 27 for preventing luminance unevenness, and a reflection layer 28 for improving luminance are provided in total. It was necessary to form a layer.

An object of the present invention is to provide a liquid crystal display device in which the number of layers to be formed is reduced. Another object of the present invention is to provide a liquid crystal display device that has further improved luminance.

[0008]

According to the present invention, there is provided a liquid crystal display device comprising: a transparent glass substrate; a driving circuit disposed at one edge of an upper surface of the transparent glass substrate; A light guide member for a backlight, a light source for a backlight provided at an end of the backlight light guide member on the edge side, and the edge on a lower surface of the transparent glass substrate. And a light-shielding layer having an upper surface having a light-shielding property. With this configuration, external light incident on the transparent glass substrate is absorbed by the upper surface of the light-shielding layer, so that it is possible to prevent the external light from reaching the drive circuit and causing a malfunction. Further, light emitted from the backlight light source and propagated upward is absorbed by the lower surface of the light-shielding layer, so that luminance unevenness can be prevented.

Further, the present invention is characterized in that the lower surface of the light-shielding layer has reflectivity. With this configuration, light that has propagated above the light guide member for backlight can be reflected on the lower surface of the light-shielding layer, further reflected on the upper surface of the light guide member for backlight, and propagated upward again. Improvement can be realized.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of an example of a liquid crystal display device according to an embodiment of the present invention. This liquid crystal display device includes a printed board 1, an LCD holder 2 provided on the printed board 1, an LCD module 3 held by the LCD holder 2, and an LCD holder 2 facing the lower surface of the LCD module 3. Light guide plate 4 held in the backlight
And The printed circuit board 1 is provided inside a mobile device such as a mobile phone.

The LCD module 3 has a four-layer structure including two upper and lower transparent glass substrates 31 and 32, and polarizing plates and the like stacked on the upper and lower sides. An LCD driver 5 is mounted on one edge (left edge in the figure) of the upper surface of the glass substrate having a larger area (lower transparent glass substrate 32 in the figure), and an upper surface is provided on the back side thereof. Has a light-shielding property, and a reflection / light-shielding layer 6 whose lower surface has reflectivity is formed.
Also, LE is opposed to the left end of the light guide plate 4 for backlight.
A backlight light source 7 made of D is provided.

Further, a portion of the LCD holder 2 facing the lower surface of the backlight light guide plate 2 reflects light emitted from the lower surface of the backlight light guide plate 4 upward to improve the brightness. Layer 8 is formed. The display area of the upper surface of the LCD module 3 faces a transparent window provided in a front case of the portable device, and can be viewed from the outside. In addition, the reflection and light shielding layer 6
It is preferable to use an adhesive tape having an aluminum layer formed thereon. In this case, the aluminum layer is used as the reflection layer, and the black adhesive layer is used as the light-shielding layer.

In the liquid crystal display device configured as described above, light emitted from the backlight light source 7 enters the backlight light guide plate 4 from the left end. Then, part of the light that has entered inside propagates upward and irradiates the display area of the LCD module 3 from below. Further, the light that has propagated downward to the outside is reflected by the reflective layer 8, propagates upward, and
The display area of the CD module 3 is irradiated from below. Further, the light that propagates upward and outside and is reflected on the lower surface of the reflection / shielding layer 6 is reflected on the upper surface of the backlight light guide plate 2 and propagates upward again to irradiate the display area of the LCD module 3 from below. . Since external light such as sunlight incident on the transparent glass substrate is absorbed by the upper surface of the reflection / shielding layer 6, the external light is reflected by the inner lower surface of the transparent glass substrate and
A situation in which the vehicle reaches the driver 5 and a malfunction occurs is prevented.

As described above, according to the liquid crystal display device of the embodiment of the present invention, the external light incident on the transparent glass substrate of the LCD module is absorbed by the upper surface of the reflection and light shielding layer 6, so that the LCD driver 5 It is possible to prevent a situation in which a malfunction occurs. In addition, light emitted from the backlight light source 7 and propagated upward is reflected by the reflection / shielding layer 6 and does not propagate upward, so that luminance unevenness can be prevented. Then, the light that propagates upward from the backlight light source 7 and is reflected by the reflection / shielding layer 6 is propagated to the display area, so that a further improvement in luminance can be realized.

[0016]

As described above, the present invention has an excellent effect that a light-shielding layer for preventing luminance unevenness is not required and the number of layers formed when manufacturing a liquid crystal display device can be reduced. A liquid crystal display device can be provided.

Further, the light which has propagated above the light guide member for the backlight is reflected on the lower surface of the light shielding layer, further reflected on the upper surface of the light guide member for the backlight, and propagates upward again, thereby improving the brightness. It is possible to provide a liquid crystal display device having an excellent effect that it can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid crystal display device according to an embodiment of the present invention;

FIG. 2 is a sectional view of a conventional liquid crystal display device.

[Explanation of symbols]

 Reference Signs List 3 LCD module 31, 32 Transparent glass substrate 4 Light guide plate for backlight 5 LCD driver 6 Reflection and light shielding layer 7 Light source for backlight

Continued on the front page (72) Koji Kuchiishi, Inventor 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Yonobu Ikeda 4-chome, Tsunashima Higashi, Kohoku-ku, Yokohama, Kanagawa No. 3 No. 1 Matsushita Communication Industrial Co., Ltd. F-term (reference) 2H091 FA14Z FA23Z FA34Z FA45Z FB08 GA11 LA12 LA13 LA17 LA18 2H092 GA60 NA01 NA27 NA29 PA07 PA09 PA12 PA13 5G435 AA03 BB12 BB15 EE27 FF03 FF06 FF08 FF13GG

Claims (3)

[Claims] 1. A transparent glass substrate, a driving circuit disposed on one edge of an upper surface of the transparent glass substrate, and a light guide member for a backlight disposed opposite to a lower surface of the transparent glass substrate. A light source for a backlight disposed at an end of the light guide member for the backlight on the side of the edge; and a light shielding disposed on the edge on a lower surface of the transparent glass substrate and having an upper surface having a light shielding property. A liquid crystal display device comprising: 2. The liquid crystal display device according to claim 1, wherein a lower surface of the light shielding layer has reflectivity. 3. The liquid crystal display device according to claim 2, wherein said light shielding layer is made of an adhesive tape having an aluminum layer formed thereon.