KR101085135B1 - Liquid Crystal Display Device - Google Patents

Abstract

The present invention relates to a liquid crystal display device capable of improving the light efficiency by forming a reflective layer under the wiring layer formed on the lower substrate and reflecting light reflected from the wiring layer again. The liquid crystal display device of the present invention includes a lower substrate and an upper substrate. Board; A wiring layer formed on the lower substrate; A reflection layer formed under the wiring layer to reflect back light reflected from the wiring layer; And a liquid crystal layer formed between the lower substrate and the upper substrate.

Reflective layer

Description

Liquid Crystal Display Device

1A is a plan view of a lower substrate constituting a conventional liquid crystal display device.

FIG. 1B is a cross-sectional view of the A-A line of FIG. 1A.

FIG. 1C is a cross-sectional view of the B-B line of FIG. 1A.

2A is a plan view of a lower substrate for a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2B is a cross-sectional view of a liquid crystal display device according to an A-A line of FIG. 2A.

FIG. 2C is a cross-sectional view of another exemplary embodiment of the liquid crystal display device corresponding to the A-A line of FIG. 2A.

3A is a plan view of a lower substrate for a liquid crystal display device according to a second embodiment of the present invention.

3B is a cross-sectional view of an exemplary embodiment of a liquid crystal display device corresponding to the B-B line of FIG. 2A.

3C is a cross-sectional view according to another exemplary embodiment of the liquid crystal display device corresponding to the B-B line of FIG. 2A.

DESCRIPTION OF THE REFERENCE NUMERALS OF THE DRAWINGS FIG.                 

100: lower substrate 120: gate wiring

140: date wiring 200: upper substrate

220: light shielding layer 300: reflective layer

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device excellent in light efficiency.

Among the ultra-thin flat panel displays, where the display screen is only a few centimeters (cm) thick, the liquid crystal display has a low operating voltage, so it has low power consumption and can be used as a portable device. The applications range from spacecraft to aircrafts.

Such a liquid crystal display device includes a lower substrate and an upper substrate facing each other at predetermined intervals, and a liquid crystal layer formed between the lower substrate and the upper substrate. In particular, the liquid crystal display device does not have a light emitting source in the device itself. A backlight is added as a light source under the lower substrate.

In such a liquid crystal display device, the orientation of the liquid crystal layer is changed by applying a voltage, and accordingly, the transmittance of light emitted from the lower backlight is adjusted to reproduce an image. Therefore, when the light emitted from the lower backlight is blocked in the middle, the efficiency of the liquid crystal display device decreases by that much.                         

Hereinafter, a conventional liquid crystal display device will be described with reference to the drawings.

FIG. 1A is a plan view of a lower substrate constituting a conventional liquid crystal display, FIG. 1B is a cross-sectional view of the A-A line of FIG. 1A, and FIG. 1C is a cross-sectional view of the B-B line of FIG. 1A.

As can be seen in FIG. 1A, a plurality of gate wirings 10 and data wirings 20 are formed on the lower substrate of the conventional liquid crystal display to define a pixel region, and the pixel electrode 30 is formed in the pixel region. Is formed. Although not shown, a thin film transistor is formed as a switching element at the intersection of the gate wiring 10 and the data wiring 20.

More specifically, referring to FIGS. 1B and 1C, a gate wiring 10 is formed on the transparent substrate 1, a gate insulating film 12 is formed on the gate wiring 10, and the gate insulating film 12 is formed. The data line 20 is formed to cross the gate line 10, the passivation layer 22 is formed on the data line 20, and the pixel electrode 30 is formed on the passivation layer 22. .

Here, a backlight (not shown) is formed below the transparent substrate 1, and the light emitted from the backlight passes through the lower substrate, and the plurality of gate wirings 10 and the data that do not transmit through the lower substrate are transmitted. Since the wiring 20 is formed, the light transmittance is reduced by that amount, which reduces the light efficiency.

The present invention has been devised to solve the above-described problems, and an object of the present invention is to provide a liquid crystal display device capable of preventing a decrease in light efficiency due to gate wiring and data wiring.

The present invention to achieve the above object, the lower substrate and the upper substrate; A wiring layer formed on the lower substrate; A reflection layer formed under the wiring layer to reflect back light reflected from the wiring layer; And it provides a liquid crystal display device comprising a liquid crystal layer formed between the lower substrate and the upper substrate.

That is, the present invention is to form a reflective layer under the wiring layer formed on the lower substrate, to improve the light efficiency by reflecting again the light reflected from the wiring layer.

In this case, the predetermined portion of the reflective layer overlaps the wiring layer, and other predetermined portions except for the predetermined portion of the reflective layer may be formed to protrude to the outside of the wiring layer.

The embossing of the lower surface of the wiring layer is preferable because the reflection angle can be increased to increase the re-reflection, and the embossing of the upper surface of the reflective layer can increase the re-reflection angle, thereby increasing the re-reflection.

In addition, the reflective layer serves to reflect back the light reflected from the wiring layer, but with the reflective layer, the light transmittance may be reduced. Therefore, it is preferable to match one end of the reflective layer with one end of the light shielding layer formed on the upper substrate since it is possible to prevent a decrease in the transmittance of light.

 The wiring layer may include a gate wiring and data wiring crossing the gate wiring, and the reflective layer may be formed below the gate wiring or the data wiring. When the reflective layer is formed below the data line, the reflective layer may be formed on the same layer as the gate line, since it is possible to prevent process addition.

 Hereinafter, with reference to the drawings will be described in detail a preferred embodiment of the present invention.

First embodiment

FIG. 2A is a plan view of a lower substrate for a liquid crystal display device according to a first embodiment of the present invention, FIG. 2B is a cross-sectional view according to an embodiment of a liquid crystal display device corresponding to an AA line of FIG. 2A, and FIG. 2C is FIG. 2A. According to another embodiment of the liquid crystal display device corresponding to the AA line of the.

A liquid crystal display device according to the present invention will be described with reference to FIGS. 2A and 2B.

First, the light blocking layer 220 is formed on the upper substrate 200 to prevent light leakage, and the red, green, and blue color filter layers 240 are formed on the light blocking layer 220. The common electrode 260 is formed on the filter layer 240.

In addition, a gate wiring 120 is formed on the lower substrate 100, a gate insulating film 110 is formed on the gate wiring 120, and the gate wiring 120 is formed on the gate insulating film 110. The data line 140 is formed to intersect with the data line.

The passivation layer 150 is formed on the data line 140, and the pixel electrode 160 is formed on the passivation layer 150. Although not shown, a thin film transistor may be formed as a switching element at the intersection of the gate wiring 120 and the data wiring 140.

The reflective layer 300 is formed on the same layer as the gate wiring 120 under the data wiring 140. That is, since the reflective layer 300 may be formed at the same time when the gate wiring 120 is formed, the reflective layer 300 may be formed without an additional process.

The reflective layer 300 is formed at the lower left and right sides of the data line 140, and a portion of the reflective layer 300 overlaps the data line 140 and another portion protrudes outside the data line 140. Formed to enhance reflection efficiency.

In addition, one end of the reflective layer 300 is formed to match one end of the light blocking layer 220 formed on the upper substrate 200. The light blocking layer 220 is formed on the upper substrate 200 to prevent leakage of light to the gate wiring 120 and the data wiring 140, and typically, the gate wiring 120 and the data wiring ( It is generally formed larger than the line width of 140 by a predetermined length. Accordingly, the present invention prevents the reflective layer 300 from protruding outside the light shielding layer 220, thereby preventing the additional light loss due to the reflective layer 300, and re-reflecting the light reflected from the data line 140. The light efficiency can be improved.

On the other hand, as shown in Figure 2c, if the lower surface of the wiring layer 140 has an embossed shape, it is preferable because the reflection angle can be increased to improve the re-reflection rate. In addition, although not shown, in contrast to FIG. 2C, instead of the lower surface of the wiring layer 140 having an embossed shape, if the upper surface of the reflective layer 300 has an embossed shape, the re-reflection angle may be increased to increase the re-reflection rate. . Of course, both the lower surface of the wiring layer 140 and the upper surface of the reflective layer 300 may have an embossed shape.

Meanwhile, an alignment layer for initial alignment of liquid crystals may be formed on the front surfaces of the lower substrate 100 and the upper substrate 200, and a liquid crystal layer may be formed between the substrates 100 and 200.

In addition, each component constituting the liquid crystal display device may be modified within a range apparent to those skilled in the art.

Second embodiment

3A is a plan view of a lower substrate for a liquid crystal display device according to a second embodiment of the present invention. FIG. 3B is a cross-sectional view of an LCD device corresponding to the BB line of FIG. 3A, and FIG. 3C is FIG. 3A. According to another embodiment of the liquid crystal display device corresponding to the BB line of.

In the liquid crystal display according to the second exemplary embodiment of the present invention, the liquid crystal according to the first exemplary embodiment of the present invention except that the reflective layer 300 is not formed below the data line 140 but is formed below the gate line 120. Same as the display element. Therefore, the same reference numerals are given, and descriptions of the same parts will be omitted.

In the liquid crystal display according to the second exemplary embodiment of the present invention, the reflective layer 300 is formed under the gate wiring 120. Specifically, the reflective layer 300 is formed on the lower substrate 100, and the insulating layer 105 is further formed on the entire surface of the lower substrate 100 including the reflective layer 300. The gate wiring 120 is formed on the insulating layer 105.

The reflective layer 300 may be formed such that a portion of the reflective layer 300 overlaps the gate line 120 and another portion of the reflective layer 300 protrudes out of the gate line 120, and / or the lower surface of the gate line 120 and / or the An upper surface of the reflective layer 300 may have an embossed shape, and one end of the reflective layer 300 may coincide with one end of the light blocking layer 220 formed on the upper substrate 200. .

The present invention is not limited to the above embodiments, and may be modified to the extent apparent to those skilled in the art within the scope of the technical idea of the present invention.

The liquid crystal display of the present invention as described above has the following effects.

First, by forming a reflective layer under the wiring layer formed on the lower substrate, it is possible to improve the light efficiency by re-reflecting the light reflected from the wiring layer again.

Second, the reflectivity may be enhanced by the embossing shape of the lower surface of the wiring layer or the embossing shape of the upper surface of the reflective layer.

Third, when the reflective layer is formed below the data wiring, the reflective layer and the gate wiring are formed on the same layer, so that the reflective layer can be formed without additional processing.

Claims (9)

A lower substrate and an upper substrate; A wiring layer formed on the lower substrate; A reflection layer formed under the wiring layer to reflect back light reflected from the wiring layer; And And a liquid crystal layer formed between the lower substrate and the upper substrate. The method of claim 1, And a predetermined portion of the reflective layer overlaps the wiring layer, and other portions except for the predetermined portion of the reflective layer protrude outside the wiring layer. The method of claim 1, And the upper surface of the reflective layer has an embossed shape. The method of claim 1, The wiring layer has a bottom surface thereof having an embossed shape. The method of claim 1, A light blocking layer for blocking light leakage on the upper substrate, a color filter layer on the light blocking layer, and a common electrode formed on the color filter layer, One end of the light blocking layer and one end of the reflective layer on the lower substrate coincide with each other. The method according to any one of claims 1 to 5, And wherein the wiring layer includes gate wiring and data wiring formed on the gate wiring so as to intersect with the gate wiring. The method of claim 6, And the reflective layer is formed under the data line. The method of claim 7, wherein And the reflective layer is formed on the same layer as the gate wiring. The method of claim 6, And an insulating layer formed between the gate wiring and the reflective layer.

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