TWI584028B - Liquid crystal display panel and thin film transistor substrate - Google Patents

Description

Liquid crystal display panel and thin film transistor substrate

The present invention relates to a liquid crystal display panel and a thin film transistor substrate.

The liquid crystal display panel generally includes a thin film transistor substrate, a color filter substrate disposed opposite to the thin film transistor substrate, and a liquid crystal layer sandwiched between the two substrates. Generally, a thin film transistor substrate is provided with a transparent conductive layer (such as a pixel electrode layer) and an opaque film transistor and a driving circuit. The color filter substrate is provided with a color photoresist layer and a black matrix. The color photoresist layer needs to be disposed corresponding to the transparent conductive layer, and the black matrix needs to be corresponding to set the thin film transistor and the driving line. However, since the thin film transistor substrate and the color filter substrate are separately fabricated and then bonded together by a frame glue, when the thin film transistor substrate and the color filter substrate are integrated, the color photoresist layer and the thin film are electrically connected. The alignment deviation is likely to occur between the crystal and the driving line, which may cause the aperture ratio or display effect of the liquid crystal display panel to be lowered.

In view of this, it is necessary to provide a liquid crystal display panel having a high aperture ratio.

A liquid crystal display panel comprising a first substrate, a second substrate and a liquid crystal layer, the first substrate comprising a first substrate, a thin film transistor disposed on the first substrate, a passivation layer covering the thin film transistor, and a pixel electrode electrically connected to the thin film transistor, and a common electrode layer insulated from the pixel electrode, the common electrode layer and the pixel The electrodes are used to generate a parallel electric field to drive the liquid crystal molecules of the liquid crystal layer to rotate in a plane, the passivation layer comprising a color photoresist layer.

A liquid crystal display panel includes a first substrate, a second substrate disposed opposite the first substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate, the first substrate including a first substrate, and a setting a thin film transistor on the first substrate, a single passivation layer covering the thin film transistor, and a pixel electrode electrically connected to the thin film transistor, the single passivation layer comprising a color photoresist layer, the second substrate comprising a second substrate and a black matrix disposed on the second substrate, the black matrix and the color photoresist layer forming a color filter of the liquid crystal display panel.

Compared with the prior art, in the liquid crystal display panel of the present invention, the color photoresist layer and the pixel electrode are more easily aligned on the same substrate than the color photoresist layer and the pixel electrode on different substrates, thereby improving the prior art. The problem of the deviation of the alignment between the colored photoresist layer and the pixel electrode increases the aperture ratio.

10, 20‧‧‧ LCD panel

11‧‧‧First substrate

12‧‧‧second substrate

13‧‧‧Liquid layer

131‧‧‧liquid crystal molecules

132‧‧‧ spacers

110, 220‧‧‧ first base

111‧‧‧film transistor

112, 212‧‧‧ Passivation layer

113‧‧‧ pixel electrodes

114‧‧‧Common electrode layer

115‧‧‧Common electrode line

116‧‧‧Insulation

119, 219‧‧‧Electrical Department

120‧‧‧second base

121, BM‧‧‧ Black Matrix

122‧‧‧ Conductive layer

1110‧‧‧ gate

1111‧‧‧ source

1112, 2112‧‧‧汲

1113‧‧‧ channel layer

141‧‧‧Light shielding layer

142‧‧‧First isolation group

143‧‧‧ gate insulation

144‧‧‧Second isolation group

151, 152, 153, 154‧ ‧ through holes

R‧‧‧Red photoresist

G‧‧‧Green photoresist

B‧‧‧Blue photoresist

117‧‧‧ first opening

118‧‧‧second opening

1 is a schematic cross-sectional view showing a first embodiment of a liquid crystal display panel of the present invention.

2 is a schematic cross-sectional view showing a second embodiment of the liquid crystal display panel of the present invention.

Please refer to FIG. 1. FIG. 1 is a cross-sectional view of a first embodiment of a liquid crystal display panel 10 of the present invention (wherein the cross section may include a stepped cross section). The liquid crystal display panel 10 includes a first substrate 11 , a second substrate 12 disposed opposite the first substrate 11 , and a liquid crystal layer 13 sandwiched between the first substrate 11 and the second substrate 12 . The first substrate 11 a first substrate 110, a thin film transistor 111 disposed on the first substrate 110, a passivation layer 112 covering the thin film transistor 111, a pixel electrode 113 electrically connected to the thin film transistor 111, and a pixel electrode 113 is provided with a common electrode layer 114 that is insulated. this In an embodiment, the passivation layer 112 also functions as a color photoresist layer that is part of the color filter of the liquid crystal display panel 10. In the embodiment, the second substrate 12 further includes a black matrix 121, which together with the passivation layer 112 constitutes a color filter of the liquid crystal display panel 10.

The liquid crystal display panel 10 may be an In-Plane Switching (IPS) liquid crystal display panel or a Fringing Field Switching (FFS) liquid crystal display panel, and the common electrode layer 114 and the pixel electrode 113 is used to generate liquid crystal molecules 131 that drive the liquid crystal layer 13 substantially parallel to the electric field of the first substrate 11 to rotate in a plane.

Further, the second substrate 12 further includes a second substrate 120 disposed on a side of the second substrate 120 adjacent to the liquid crystal layer 13 and a conductive layer 122 disposed on the second substrate 120 away from the second substrate 120. The liquid crystal layer 13 is on one side. The conductive layer 122 is further insulated from the common electrode layer 114 to form a capacitive touch sensing structure, such that the dielectric layer between the conductive layer 122 and the common electrode layer 114 includes at least the liquid crystal layer 13, the second The substrate 120 and the black matrix 121.

Specifically, the common electrode layer 114 is disposed on the passivation layer 112. The first substrate 11 further includes a common electrode line 115 and an insulating layer 116. The common electrode line 115 is disposed on the common electrode layer 114. The insulating layer 116 is disposed on the common electrode layer 114. The pixel electrode 113 is disposed on the common electrode layer 114 and the common electrode line 115. The pixel electrode 113 is disposed on the insulating layer 116. The passivation layer 112 includes a via 151 extending through the passivation layer 112. The first substrate 11 further includes a conductive portion 119 disposed on the passivation layer 112 and connected to the thin film transistor 111 via the via 151. The conductive portion 119 The conductive layer 116 is spaced apart from the common electrode layer 114. The insulating layer 116 includes a via hole 152 extending through the insulating layer 116. The pixel electrode 113 is electrically connected to the conductive portion 119 via the via hole 152 to be electrically connected to the thin film transistor 111.

The material of the common electrode layer 114 and the pixel electrode 113 may be a transparent conductive layer. The material of the common electrode line 115 may be an opaque metal, and the material of the conductive portion 119 is also an opaque metal. Preferably, the conductive portion 119 is the same material as the common electrode line 115, and the conductive portion 119 and the common electrode line 115 are formed in the same mask process. Specifically, in the manufacturing process of the first substrate 11, after the common electrode layer 114 is formed, a metal layer and a photoresist layer for manufacturing the common electrode line 115 and the conductive portion 119 are deposited, and then provided A mask of a specific pattern is exposed to the photoresist layer, and the exposed photoresist layer is developed to form a predetermined photoresist pattern. Further, the metal layer is etched to form the common electrode line 115 and the conductive portion 119 having a predetermined pattern, and the remaining photoresist layer is removed, thereby completing the fabrication of the common electrode line 115 and the conductive portion 119. .

In addition, the thin film transistor 111 may be a low temperature polycrystalline germanium thin film transistor including a gate 1110, a source 1111, a drain 1112, and a channel layer 1113. The first substrate 110 is a transparent substrate such as a glass substrate. The second substrate 12 may also be a transparent substrate. The first substrate 11 further includes a light shielding layer 141, a first isolation layer group 142, a gate insulating layer 143, and a second isolation layer group 144.

Specifically, the light shielding layer 141 is disposed on the first substrate 110. The first isolation layer group 142 covers the light shielding layer 141, and may include three isolation layers. The material of the three isolation layers may be yttrium oxide, tantalum nitride and hafnium oxide from bottom to top. The channel layer 1113 is disposed on the first isolation layer group 142, and includes a lightly doped region and a heavily doped region. The gate insulating layer 143 covers the channel layer 1113, and the material thereof may be yttrium oxide. The gate electrode 1110 is disposed on the gate insulating layer 143. In the embodiment, the thin film transistor 111 may be a double gate type thin film transistor. The second isolation layer group 144 is disposed on the gate 1110, which may include bottom-up nitride and oxygen Phlegm. The second isolation layer group 144 and the gate insulating layer 143 are further provided with a via hole 153 and a via hole 154 extending through the second isolation layer group 144 and the gate insulating layer 143. The source 1111 and the drain 1112 are disposed on the second isolation layer group 144, and the source 1111 is connected to one end of the channel layer 1113 through the via hole 153. The drain electrode 1112 is connected through the via hole 154. To the other end of the channel layer 1113. It can be understood that the source 1111 is further connected to a source driving line (not shown) disposed on the second isolation layer group 144 and disposed in the same layer as the source 1111. The gate 1110 is further connected to the gate. A gate driving line (not shown) provided on the insulating layer 143 and disposed in the same layer as the gate 1110.

The passivation layer 112, that is, the color photoresist layer, covers the second isolation layer group 144, the source electrode 1111, and the drain electrode 1112, and the position of the via hole 153 penetrating the color photoresist layer may be The via holes 152 correspond to each other. The color photoresist layer may include a spaced red photoresist R, a green photoresist G, and a blue photoresist B.

In addition, as shown in FIG. 1 , a plurality of first openings 117 are formed in the pixel electrode 113 , and the common electrode layer 114 forms a plurality of second openings 118 , and the plurality of first openings 117 and the plurality of second openings 118 may be interlaced. Settings. Certainly, when the liquid crystal display panel 10 is a fringe field switching type liquid crystal display panel, the common electrode layer 114 may not be provided with the plurality of second openings 118 or the first opening 117 is not disposed in the pixel electrodes 113. Moreover, the liquid crystal display panel 10 may further include a spacer 132 located in the liquid crystal layer 13, wherein the position of the spacer 132 may correspond to the common electrode line 115.

Compared with the prior art, in the liquid crystal display panel 10 of the present invention, the color photoresist layer and the pixel electrode 113 are more easily aligned on the same substrate than the color photoresist layer and the pixel electrode on different substrates, thereby being improved. The problem of the deviation of the alignment between the color resist layer of the prior art and the pixel electrode 113 increases the aperture ratio.

Please refer to FIG. 2. FIG. 2 is a cross-sectional view showing a second embodiment of the liquid crystal display panel 20 of the present invention. intention. The main difference between the liquid crystal display panel 20 of the second embodiment and the liquid crystal display panel 10 of the first embodiment is that the second substrate 22 may not include a black matrix, and the passivation layer 212 of the first substrate 21 serves as the liquid crystal display panel 20 . The color filter, that is, the passivation layer 212 includes a black matrix BM and a color photoresist layer, wherein the color photoresist layer includes a red photoresist R, a green photoresist G, and a blue photoresist B which are sequentially spaced apart, the black The matrix BM is disposed between the adjacent two photoresists of the red photoresist R, the green photoresist G, and the blue photoresist B. Further, preferably, the conductive portion 219 is a metal that does not transmit light, and also covers the position where the drain 2112 is located, and shields light near the drain 2112.

In the liquid crystal display panel 20 of the second embodiment, the black matrix BM and the thin film transistor are both disposed on the second substrate 12 to be easily aligned, thereby improving the alignment deviation between the black matrix BM and the thin film transistor, and improving the problem. Opening ratio.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art can make equivalent modifications or variations according to the spirit of the present invention. All should be covered by the following patent application.

10‧‧‧LCD panel

11‧‧‧First substrate

12‧‧‧second substrate

13‧‧‧Liquid layer

131‧‧‧liquid crystal molecules

132‧‧‧ spacers

110‧‧‧First base

111‧‧‧film transistor

112‧‧‧ Passivation layer

113‧‧‧ pixel electrodes

114‧‧‧Common electrode layer

115‧‧‧Common electrode line

116‧‧‧Insulation

119‧‧‧Electrical Department

120‧‧‧second base

121‧‧‧Black matrix

122‧‧‧ Conductive layer

1110‧‧‧ gate

1111‧‧‧ source

1112‧‧‧汲polar

1113‧‧‧ channel layer

141‧‧‧Light shielding layer

142‧‧‧First isolation group

143‧‧‧ gate insulation

144‧‧‧Second isolation group

151, 152, 153, 154‧ ‧ through holes

R‧‧‧Red photoresist

G‧‧‧Green photoresist

B‧‧‧Blue photoresist

117‧‧‧ first opening

118‧‧‧second opening

Claims (13)

A liquid crystal display panel includes a first substrate, a second substrate disposed opposite the first substrate, and a liquid crystal layer sandwiched between the first substrate and the second substrate, the first substrate including a first substrate, and a setting a thin film transistor on the first substrate, a passivation layer covering the thin film transistor, a pixel electrode electrically connected to the thin film transistor, a common electrode layer insulated from the pixel electrode, and a common electrode layer disposed on the common electrode An insulating layer between the common electrode layer and the pixel electrode for generating liquid crystal molecules that drive the liquid crystal layer parallel to the electric field of the first substrate, the passivation layer also functioning as a color photoresist layer The common electrode layer is disposed on a surface of the color photoresist layer, the passivation layer includes a first via hole penetrating the passivation layer, and the first substrate further includes a buffer layer disposed on the passivation layer and connected via the first via hole a conductive portion of the drain of the thin film transistor, the conductive portion is spaced apart from the common electrode layer, the insulating layer includes a second via hole penetrating the insulating layer, and the pixel electrode passes through the second via hole Drain connected to the conductive portion to the thin film transistor is connected. The liquid crystal display panel of claim 1, wherein the second substrate comprises a second substrate and a conductive layer disposed on the second substrate, the conductive layer is further insulated from the common electrode layer to form a capacitive touch The sensing structure, the dielectric layer between the conductive layer and the common electrode layer includes the liquid crystal layer. The liquid crystal display panel of claim 2, wherein the conductive layer is disposed on a side of the second substrate away from the liquid crystal layer. The liquid crystal display panel of any one of claims 1 to 3, wherein the second substrate further comprises a black matrix, the black matrix and the color photoresist layer constituting a color filter of the liquid crystal display panel, the colored light The resist layer acts as a passivation layer covering the thin film transistor. The liquid crystal display panel of claim 4, wherein the black matrix is disposed adjacent to the second substrate The liquid crystal layer is on one side. The liquid crystal display panel of any one of claims 1 to 3, wherein the first substrate further comprises a black matrix, and the black matrix and the color photoresist layer constitute a color filter of the liquid crystal display panel, the black matrix The passivation layer is composed of the color photoresist layer. The liquid crystal display panel of claim 6, wherein the color photoresist layer comprises a red photoresist, a green photoresist, and a blue photoresist arranged in sequence, and the black matrix is disposed on the red photoresist, the green photoresist, and Between two adjacent photoresists of blue photoresist. The liquid crystal display panel of claim 1, wherein the first substrate further comprises a common electrode line, and the common electrode line is disposed on the common electrode layer. The liquid crystal display panel of claim 8, wherein the insulating layer covers the common electrode line, and the pixel electrode is disposed on the insulating layer. The liquid crystal display panel of claim 1, wherein the material of the conductive portion is metal. The liquid crystal display panel of claim 10, wherein the conductive portion is the same material as the common electrode line. The liquid crystal display panel of claim 10, wherein the conductive portion and the common electrode line are formed in the same mask process. The liquid crystal display panel of claim 1, wherein the thin film transistor is a low temperature polycrystalline thin film transistor.