CN100568073C - LCD panel - Google Patents

Abstract

A liquid crystal display panel comprises an active element array substrate, an opposite substrate and a liquid crystal layer. The active element array substrate comprises a plurality of pixel units, and each pixel unit is provided with a reflection area and a transmission area. The opposite substrate is arranged above the active element array substrate and is provided with a shared electrode, a plurality of first alignment bulges corresponding to the reflection areas and a plurality of second alignment bulges corresponding to the penetration areas, wherein the first alignment bulges and the second alignment bulges are positioned between the opposite substrate and the active element array substrate. In addition, the height of the first alignment protrusion is greater than the height of the second alignment protrusion. Wherein, part of the first alignment bulges are only used for alignment, and the rest of the first alignment bulges are contacted with the active element array substrate, so that the rest of the first alignment bulges not only have the alignment function, but also can be used as spacers. The liquid crystal layer is arranged between the opposite substrate and the active element array substrate. The liquid crystal display panel has high aperture ratio.

Description

LCD panel

technical field

The invention relates to a liquid crystal display panel, in particular to a liquid crystal display panel with a high aperture ratio.

Background technique

A display panel used in a Liquid Crystal Display (LCD) is mainly composed of an active element array substrate, a counter substrate, and a liquid crystal layer arranged between the two substrates. Currently, liquid crystal display panels are developing toward full color, large size, high resolution, and low cost. However, various performances of liquid crystal display panels, such as response speed, contrast, and viewing angle, are all related to the liquid crystal layer.

In order to precisely control the cell gap between the upper and lower substrates of the liquid crystal display, a spacer is generally added between the active element array substrate and the opposite substrate. In the past, the common spacer was a ball spacer, but the distribution of the ball spacer was often uneven and light leakage often occurred at the edge of the ball spacer. Therefore, photo spacers made of photoresist materials are developed and gradually replace spherical spacers. However, although the photoresist spacers can be arranged regularly and correctly without uneven distribution, light leakage still occurs at their edges. When making photoresist spacers, a light-shielding layer (such as a black matrix) must be designed at the position of the photoresist spacers to reduce the impact of light leakage on display image quality. In addition, in order to stabilize the photoresist spacers, a stage corresponding to the photoresist spacers must be fabricated on the active device array substrate. In this way, the aperture ratio of the liquid crystal display panel is thus reduced.

As far as the display panel of the multi-domain vertical alignment liquid crystal display is concerned, in order to achieve the effect of wide viewing angle, a plurality of alignment protrusions are usually arranged on the opposite substrate. However, the edges of the alignment protrusions, like the edges of the above-mentioned spacers, may cause light leakage, and a light-shielding black matrix must be configured to avoid affecting the display effect of the liquid crystal display panel. Therefore, how to maintain the aperture ratio in a multi-domain vertical alignment liquid crystal display with both spacers and alignment bumps is one of the issues worth pondering.

Contents of the invention

In view of the above problems, the present invention provides a liquid crystal display panel to solve the problem that the aperture ratio is greatly reduced when alignment protrusions and spacers are arranged at the same time.

The invention provides a liquid crystal display panel, which includes an active element array substrate, an opposite substrate and a liquid crystal layer. The active element array substrate includes a plurality of pixel units, and each pixel unit has a reflective area, a penetrating area, an active element, a reflective pixel electrode electrically connected to the active element and located in the reflective area, and electrically connected to the An active element and a transparent pixel electrode located in the penetrating area. The opposite substrate is disposed above the active element array substrate, and the opposite substrate has a shared electrode, a plurality of first alignment protrusions corresponding to the reflective area, and a plurality of second alignment protrusions corresponding to the penetrating area, wherein the first An alignment protrusion and a second alignment protrusion are located between the opposite substrate and the active element array substrate, and the first alignment protrusions are both located between the common electrode and the reflective pixel electrode. In addition, the height of the first alignment protrusion is greater than the height of the second alignment protrusion. Some of the first alignment bumps are only used for alignment, while the rest of the first alignment bumps are in contact with the active element array substrate, so that the rest of the first alignment bumps not only have an alignment function, It can also be used as a spacer. The liquid crystal layer is disposed between the opposite substrate and the active element array substrate.

In an embodiment of the present invention, the above-mentioned active device array substrate has a plurality of depressions, and each depression corresponds to a part of the first alignment protrusion below. At the same time, a part of the first alignment protrusion corresponding to the upper part of each recess maintains a gap with the active element array substrate, while the rest of the first alignment protrusion is in contact with the active element array substrate.

In an embodiment of the present invention, the above-mentioned opposite substrate further includes a black matrix arranged corresponding to the first alignment protrusions and the second alignment protrusions.

In an embodiment of the present invention, each pixel unit includes an active element, a reflective pixel electrode and a transparent pixel electrode. Wherein, the reflective pixel electrode is electrically connected to the active element and located in the reflective area, while the transparent pixel electrode is electrically connected to the active element and located in the transmissive area. At this time, the active element is located under the reflective pixel electrode, for example.

In an embodiment of the present invention, the active element array substrate further includes a plurality of bumps, wherein the reflective pixel electrodes cover the bumps.

In an embodiment of the present invention, the active device array substrate further includes a pad layer, wherein the reflective pixel electrode covers the pad layer and the bump.

In an embodiment of the present invention, the above-mentioned opposite substrate includes, for example, a pad layer corresponding to the top of each reflective pixel electrode, and the opposite substrate further includes a shared electrode, and the shared electrode covers the pad layer.

In an embodiment of the present invention, the above-mentioned opposite substrate includes a color filter.

The present invention also provides a liquid crystal display panel, which includes an active element array substrate, an opposite substrate and a liquid crystal layer. The active element array substrate includes a plurality of pixel units, and each pixel unit has a reflective area, a penetrating area, an active element, a reflective pixel electrode electrically connected to the active element and located in the reflective area, and electrically connected to the The active element and the transparent pixel electrode located in the penetrating area, and the active element array substrate has a plurality of depressions, and the depressions are located in the partial reflection area. The opposite substrate is arranged above the active element array substrate, and the opposite substrate has a shared electrode, a plurality of first alignment protrusions corresponding to the reflective area, and a plurality of second alignment protrusions corresponding to the penetration area, and the second alignment protrusion corresponds to the penetrating area. An alignment protrusion and a second alignment protrusion are located between the opposite substrate and the active element array substrate, and the first alignment protrusions are both located between the common electrode and the reflective pixel electrode. In addition, some of the first alignment protrusions correspond to the top of the recess and maintain a gap with the active element array substrate, while the rest of the first alignment protrusions are in contact with the active element array substrate, so that the part of the first alignment protrusions The first alignment protrusions are only used for alignment, while the rest of the first alignment protrusions not only have an alignment function, but also serve as spacers. The liquid crystal layer is disposed between the opposite substrate and the active element array substrate.

In an embodiment of the present invention, the above-mentioned opposite substrate further includes a black matrix arranged corresponding to the first alignment protrusions and the second alignment protrusions.

In an embodiment of the present invention, each pixel unit includes an active element, a reflective pixel electrode and a transparent pixel electrode. Wherein, the reflective pixel electrode is electrically connected to the active element and located in the reflective area, while the transparent pixel electrode is electrically connected to the active element and located in the transmissive area. At this time, the active element is located under the reflective pixel electrode, for example.

In an embodiment of the present invention, the active element array substrate further includes a plurality of bumps, wherein the reflective pixel electrodes cover the bumps.

In an embodiment of the present invention, the active device array substrate further includes a pad layer, wherein the reflective pixel electrode covers the pad layer and the bump.

On the other hand, the opposite substrate may include a pad layer corresponding to the top of each reflective pixel electrode, and the opposite substrate further includes a common electrode, and the common electrode covers the pad layer.

In an embodiment of the present invention, the above-mentioned opposite substrate includes a color filter.

In the liquid crystal display panel in the above-mentioned embodiments of the present invention, the alignment protrusions in contact with the active element array substrate can be used as spacers, so there is no need to additionally configure spacers at other positions, and the opening of the liquid crystal display panel can be increased. Rate.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1 a is a schematic top view of a liquid crystal display panel according to a first embodiment of the present invention.

Fig. 1b is a sectional view taken along the section line A-A' of Fig. 1a.

Fig. 1c is a sectional view taken along the section line B-B' of Fig. 1a.

FIG. 2a is a schematic top view of a liquid crystal display panel according to a second embodiment of the present invention.

Fig. 2b and Fig. 2c are cross-sectional schematic diagrams drawn along the section line A-A' of Fig. 2a.

FIG. 3 a is a schematic top view of a liquid crystal display panel according to a third embodiment of the present invention.

FIG. 3 b is a schematic cross-sectional view of a reflective region of a liquid crystal display panel according to a third embodiment of the present invention.

Wherein, the reference signs are explained as follows:

100, 200, 300: Liquid crystal display panel 110: Active element array substrate

112: bump 114: depression

116: flat layer 120: pixel unit

122: Active component 124: Reflective pixel electrode

126: Transparent pixel electrode 130: Counter substrate

132, 132A, 132B, 332A, 332B: first alignment bumps

134: Second alignment bump 136: Black matrix

138: Color filter film 140: Shared electrode

150: Liquid crystal layer 270: Padding layer

A-A': Sectional line B-B': Sectional line

dr: the gap in the reflective area dt: the gap in the penetrating area

g: gap h1, h2: height

R: Reflective area T: Penetrating area

Detailed ways

first embodiment

Fig. 1a is a schematic top view of a liquid crystal display panel according to the first embodiment of the present invention, Fig. 1b is a sectional view along the section line AA' of Fig. 1a, and Fig. 1c is a section view along the section line BB' of Fig. 1a Sectional view. Please refer to FIG. 1a and FIG. 1b at the same time. The liquid crystal display panel 100 of this embodiment includes an active element array substrate 110 , an opposite substrate 130 and a liquid crystal layer 150 . The active device array substrate 110 includes a plurality of pixel units 120 , and each pixel unit 120 has a reflective region R and a transmissive region T. The gap dr of the reflective region R is approximately the same as the gap dt of the transmissive region T, and this structure is called a single gap structure (single gap). The opposite substrate 130 is disposed above the active element array substrate 110 . The opposite substrate 130 has a plurality of first alignment protrusions 132 corresponding to the reflection region R and a plurality of second alignment protrusions 134 corresponding to the transmission region T, wherein the first alignment protrusions 132 and the second alignment protrusions 134 It is located between the opposite substrate 130 and the active element array substrate 110 . In addition, the height h1 of the first alignment protrusion 132 is greater than the height h2 of the second alignment protrusion 134 . The liquid crystal layer 150 is disposed between the opposite substrate 130 and the active element array substrate 110 .

Specifically, the pixel unit 120 includes an active element 122 , a reflective pixel electrode 124 and a transparent pixel electrode 126 . Wherein, the reflective pixel electrode 124 is electrically connected to the active element 122 and located in the reflective region R, and the transparent pixel electrode 126 is electrically connected to the active element 122 and located in the transmissive region T. In this embodiment, the active element 122 is located under the reflective pixel electrode 124 , and the transparent pixel electrode 126 is electrically connected to the active element 122 through the reflective pixel electrode 124 . Therefore, when the liquid crystal display panel 100 is in a driving state, the transparent pixel electrode 126 and the reflective pixel electrode 124 may have the same voltage. In other embodiments, the transparent pixel electrode 126 and the reflective pixel electrode 124 may be electrically connected to different active elements, respectively, and the transparent pixel electrode 126 and the reflective pixel electrode 124 may have the same or different voltages.

In order to improve the reflectivity of the reflective pixel electrodes 124 , in this embodiment, a plurality of bumps 112 may be arranged on the active element array substrate 110 , and the reflective pixel electrodes 124 cover the bumps 112 . In addition, the opposite substrate 130 is, for example, a color filter having red, green and blue color filter films 138 , and a common electrode 140 is disposed on the opposite substrate 130 .

Please continue to refer to FIG. 1b. The first alignment protrusions 132 and the second alignment protrusions 134 are, for example, disposed in the display area of the liquid crystal display panel 100. The first alignment protrusions 132 and the second alignment protrusions 134 can make the liquid crystal layer 150 The liquid crystal molecules in the liquid crystal display have multiple alignment directions, so that the liquid crystal display panel 100 has the function of wide viewing angle. In addition, as shown in FIG. 1b, the first alignment protrusion 132 located in the reflective region R can be in contact with the active element array substrate 110, that is, the height h1 of the first alignment protrusion 132 can support the two substrates 110, 130, so as to The thickness of the liquid crystal layer 150 is maintained. Therefore, the first alignment protrusions 132 can serve as spacers, and there is no need to additionally arrange spacers at other positions in the liquid crystal display panel 100 to maintain the thickness of the liquid crystal layer 150 .

Since the edge of the first alignment protrusion 132 and the second alignment protrusion 134 is prone to light leakage, in this embodiment, a black matrix 136 can be provided on the opposite substrate 130, and the black matrix 136 can be made to correspond to the first alignment protrusion. 132 and the second alignment protrusion 134 are configured. When viewed from the angle perpendicular to the opposite substrate 130, the area of the black matrix 136 will be slightly larger than the areas of the first alignment protrusions 132 and the second alignment protrusions 134, so that the black matrix 136 is sufficient to cover light leakage or other defect. It is worth mentioning that, in this embodiment, the first alignment protrusion 132 not only has an alignment function, but also serves as a spacer, so there is no need to make additional spacers at other positions.

In addition, in order to maintain a proper thickness of the liquid crystal layer 150 (ie, the liquid crystal display gap), the spacers must be uniformly distributed in the liquid crystal display panel 100 at a specific density. Therefore, in this embodiment, the active element array substrate 110 may have a plurality of recesses 114, and the recesses 114 correspond to the lower part of the first alignment protrusions 132a (as shown in FIG. 1c). Meanwhile, a part of the first alignment protrusions 132 a corresponding to the upper portion of the recess 114 maintains a gap g with the active device array substrate 110 , and the rest of the first alignment protrusions 132 b are in contact with the active device array substrate 110 . The gap g between the first alignment protrusion 132a and the active device array substrate 110 is, for example, between 0.1 μm and 5.0 μm. In short, some of the first alignment protrusions 132a are only used for alignment, while the rest of the first alignment protrusions 132b can perform both the alignment function and the spacer function.

As shown in FIG. 1 c , for example, a planar layer 116 is disposed on the active element array substrate 110 , and in this embodiment, the recess 114 is formed on the planar layer 116 . In detail, the formation of the recess 114 is, for example, formed by removing part of the flat layer 116 while forming the bump 112, so the formation of the recess 114 does not increase or complicate the manufacturing steps of the liquid crystal display panel 100. . Certainly, in other embodiments, the recess 114 may also be formed on other film layers of the active element array substrate 110 . Overall, the thickness of the liquid crystal layer 150 in the liquid crystal display panel 100 can be strictly controlled, and the liquid crystal display panel 100 has a relatively high aperture ratio.

second embodiment

2a is a schematic top view of a liquid crystal display panel according to a second embodiment of the present invention, and FIGS. 2b and 2c are schematic cross-sectional views along the line A-A' of FIG. 2a. Please refer to FIG. 2a first. The liquid crystal display panel 200 of this embodiment is substantially the same as the liquid crystal display panel 100 of the first embodiment. It can be seen from FIG. 2a and FIG. 2b that the pad layer 270 can make the product of the refractive index and the thickness (Δn·d) of the liquid crystal layer above the reflective region R and the transmissive region T roughly the same, so as to achieve a better display effect.

In this embodiment, the pad layer 270 may also be disposed on the opposite substrate 130 (as shown in FIG. 2 b ), and corresponds to the top of each reflective pixel electrode 124 . At this time, the common electrode 140 on the opposite substrate 130 will cover the pad layer 270 , and the first alignment protrusion 132 is disposed on the pad layer 270 . On the other hand, the pad layer 270 can also be arranged on the active element array substrate 110 (as shown in FIG. Pad layer 270 above. With the arrangement of the pad layer 270 , when the liquid crystal display panel 200 performs display, the display quality in the reflective region R and the transmissive region T is relatively similar. When the gap dr of the reflective region R is about 1/2 of the gap dt of the transmissive region T, there will be the best optical performance, and this structure is called a dual gap structure (dual gap).

Based on the above, the design of the first alignment protrusions 132 and the second alignment protrusions 134 of the liquid crystal display panel 200 is the same as that of the first alignment protrusions 132 and the second alignment protrusions 134 of the liquid crystal display panel 100, and part of the first alignment protrusions The protrusions 132 can be used as spacers. In addition, the height h1 of the first alignment protrusion 132 is greater than the height h2 of the second alignment protrusion 134 . Therefore, the liquid crystal display panel 200 also has the advantage of a high aperture ratio. It should be noted that when the pad layer 270 is located on the active element array substrate 110 (as shown in FIG. Pad layer 270. Meanwhile, the distance between the active device array substrate 110 and the opposite substrate 130 is approximately equal to the sum of the height of the first alignment protrusion 132 and the height of the pad layer 270 . Under such a design, the liquid crystal display panel 200 not only has a high aperture ratio, but also has good display quality.

third embodiment

FIG. 3 a is a schematic top view of a liquid crystal display panel according to a third embodiment of the present invention, and FIG. 3 b is a schematic cross-sectional view of a reflective region of the liquid crystal display panel according to a third embodiment of the present invention. The liquid crystal display panel 300 of this embodiment is similar to the liquid crystal display panel 100 , so the same components are marked with the same reference numerals, and no further description is given here.

Please refer to FIG. 3a and FIG. 3b at the same time. In the liquid crystal display panel 300, the active element array substrate 110 has a plurality of recesses 114, and the recesses 114 correspond to part of the first alignment protrusions 332A. At this time, a gap g is maintained between the active device array substrate 110 and the first alignment protrusion 332A, while the remaining first alignment protrusions 332B are in contact with the active device array substrate 110 . Actually, the plurality of recesses 114 on the active device array substrate 110 can be formed in the planar layer 116 or other film layers on the active device array substrate 100 , for example. In addition, in the liquid crystal display panel 300 , this embodiment does not limit the height of the first alignment protrusions 332A, 332B to be greater than the height of the second alignment protrusions 334 .

In the liquid crystal display panel 300 , the remaining first alignment protrusions 332B can be used as spacers to maintain a constant thickness of the liquid crystal layer 150 , so the liquid crystal display panel 300 has better quality. At the same time, the liquid crystal display panel 300 also has a high aperture ratio as the liquid crystal display panel 100 of the above-mentioned embodiment. In addition, the liquid crystal display panel 300 can also be the same as the liquid crystal display panel 200, and can present better display quality by disposing a laying layer. .

In summary, in the liquid crystal display panel of the present invention, since the rest of the alignment protrusions can also be used as spacers, there is no need to additionally arrange spacers at other positions to maintain the thickness of the liquid crystal layer, so the liquid crystal can be reduced. The aperture ratio loss of the display panel. In short, the liquid crystal display panel of the present invention has a high aperture ratio.

Although the present invention has been disclosed above with multiple embodiments, it is not intended to limit the present invention. Those skilled in the art should be able to make some changes and modifications without departing from the concept and scope of the present invention. Therefore, the protection of the present invention The scope should be governed by the scope of the appended claims.

Claims (18)

1. A liquid crystal display panel, comprising: An active element array substrate, including a plurality of pixel units, and each of the pixel units has: a reflective area; a penetrating area; an active component; a reflective pixel electrode electrically connected to the active element and located in the reflective area; and a transparent pixel electrode, electrically connected to the active element, and located in the penetrating region; A pair of opposite substrates, arranged above the active element array substrate, the opposite substrate has a shared electrode, a plurality of first alignment protrusions corresponding to the reflective area, and a plurality of first alignment protrusions corresponding to the penetrating area The second alignment protrusion, the first alignment protrusion and the second alignment protrusion are located between the opposite substrate and the active element array substrate, and the first alignment protrusions are both located between the common electrode and the active element array substrate. Between the reflective pixel electrodes, and the height of the first alignment protrusion is greater than the height of the second alignment protrusion, wherein part of the first alignment protrusion is only used for alignment, and the rest of the first alignment protrusion The alignment protrusions are in contact with the active element array substrate, so that the rest of the first alignment protrusions not only have an alignment function, but also serve as spacers; and A liquid crystal layer is disposed between the opposite substrate and the active element array substrate. 2. The liquid crystal display panel as claimed in claim 1, wherein the active element array substrate has a plurality of depressions, and the depressions correspond to the parts below the first alignment protrusions. 3. The liquid crystal display panel as claimed in claim 2, wherein a gap is maintained between the first alignment protrusion corresponding to the upper portion of the recess and the active element array substrate, and the rest of the first alignment protrusion is in contact with the active element array substrate. The active element array substrate contacts. 4. The liquid crystal display panel as claimed in claim 1, wherein the opposite substrate further comprises a black matrix, and the black matrix is disposed corresponding to the first alignment protrusions and the second alignment protrusions. 5. The liquid crystal display panel as claimed in claim 1, wherein the active element is located below the reflective pixel electrode. 6. The liquid crystal display panel as claimed in claim 1, wherein the active element array substrate further comprises a plurality of bumps, and the reflective pixel electrode covers the bumps. 7. The liquid crystal display panel as claimed in claim 6, wherein the active element array substrate further comprises a pad layer, wherein the reflective pixel electrode covers the pad layer and the bump. 8. The liquid crystal display panel as claimed in claim 1, wherein the opposite substrate further comprises a pad layer corresponding to the top of each of the reflective pixel electrodes. 9. The liquid crystal display panel as claimed in claim 8, wherein the common electrode covers the pad layer. 10. The liquid crystal display panel as claimed in claim 1, wherein the opposite substrate comprises a color filter. 11. A liquid crystal display panel, comprising: An active element array substrate, including a plurality of pixel units, and each of the pixel units has: a reflective area; a penetrating area; an active component; a reflective pixel electrode electrically connected to the active element and located in the reflective area; and a transparent pixel electrode electrically connected to the active element and located in the penetrating region, Wherein, the active element array substrate has a plurality of depressions, and the depressions are located in part of the reflection area; A pair of opposite substrates, arranged above the active element array substrate, the opposite substrate has a shared electrode, a plurality of first alignment protrusions corresponding to the reflective area, and a plurality of first alignment protrusions corresponding to the penetrating area The second alignment protrusion, and the first alignment protrusion and the second alignment protrusion are located between the opposite substrate and the active element array substrate, and the first alignment protrusions are both located on the shared electrode Between the reflective pixel electrode, part of the first alignment protrusions correspond to the top of the recess, and maintain a gap with the active element array substrate, while the rest of the first alignment protrusions and the active element array substrate The source element array substrate is in contact, so that the part of the first alignment protrusion is only used for alignment, while the rest of the first alignment protrusion not only has the alignment function, but also serves as a spacer; and A liquid crystal layer is disposed between the opposite substrate and the active element array substrate. 12. The liquid crystal display panel as claimed in claim 11, wherein the opposite substrate further comprises a black matrix, and the black matrix is arranged corresponding to the first alignment protrusions and the second alignment protrusions. 13. The liquid crystal display panel as claimed in claim 11, wherein the active element is located under the reflective pixel electrode. 14. The liquid crystal display panel as claimed in claim 11, wherein the active element array substrate further comprises a plurality of bumps, wherein the reflective pixel electrode covers the bumps. 15. The liquid crystal display panel as claimed in claim 14, wherein the active device array substrate further comprises a pad layer, wherein the reflective pixel electrode covers the pad layer and the bumps. 16. The liquid crystal display panel as claimed in claim 11, wherein the opposite substrate further comprises a pad layer corresponding to the top of each of the reflective pixel electrodes. 17. The liquid crystal display panel as claimed in claim 16, wherein the common electrode covers the pad layer. 18. The liquid crystal display panel as claimed in claim 11, wherein the opposite substrate comprises a color filter.

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