Cholesteric liquid crystal display device

Abstract

This disclosure provides a cholesteric liquid crystal display device, comprising a lower substrate, a lower electrode layer, a pixel layer, an upper electrode layer, a plurality of support members, and an upper substrate. The lower electrode layer is disposed on a surface of the lower substrate. The pixel layer is connected to the lower electrode layer. The upper electrode layer is connected to the pixel layer, such that the pixel layer is sandwiched between the lower electrode layer and the upper electrode layer. The support members are disposed between the lower electrode layer and the upper electrode layer. The upper substrate is connected to the upper electrode layer, such that the upper electrode layer is located between the pixel layer and the upper substrate. Accordingly, reflected light at the lower electrode layer and the lower substrate can be significantly reduced, thereby improving the contrast and optical performance of the cholesteric liquid crystal display device.

Description

Technical Field

[0001] This disclosure relates to a liquid crystal display device, and more particularly to a cholesterol liquid crystal display device that can reduce the impact of reflected light on display performance. Prior Technology

[0002] A cholesteric liquid crystal display (CLCD) is a display device that uses cholesteric liquid crystals to reflect external light to display images. A conventional Cholesteric liquid crystal display includes a substrate, a lower electrode layer, a liquid crystal layer, and a upper electrode layer stacked sequentially. The lower and upper electrode layers can apply an electric field to the liquid crystal layer to adjust the state of the cholesteric liquid crystals within the liquid crystal layer. Furthermore, the conventional Cholesteric liquid crystal display also includes a protective section disposed between the substrate and the lower electrode layer to provide protection.

[0003] Please refer to Figure 5, which is a partial top view of the matrix section 910 and the protective section 920 of a conventional cholesteric liquid crystal display device. As can be seen from Figure 5, in a conventional cholesteric liquid crystal display device, because the protective section 920 covers a large area of ​​the surface of the lower substrate (not shown), external light passing through the pixel layer (not shown) is reflected by the protective section 920, affecting the display image of the pixel layer and thus reducing the contrast and optical performance of the conventional cholesteric liquid crystal display device.

[0004] In view of this, reducing the reflection problem between the substrate and the lower electrode layer of a cholesterol liquid crystal display device has become the goal of relevant manufacturers. Summary of the Invention

[0005] The purpose of this disclosure is to provide a cholesterol liquid crystal display device that reduces the structural configuration between the lower substrate and the lower electrode layer to reduce reflection problems.

[0006] One embodiment of this disclosure provides a cholesteric liquid crystal display device, comprising a lower substrate, a lower electrode layer, a pixel layer, an upper electrode layer, a plurality of support members, and an upper substrate. The lower electrode layer is disposed on a surface of the lower substrate. The pixel layer is connected to the lower electrode layer. The upper electrode layer is connected to the pixel layer, such that the pixel layer is sandwiched between the lower electrode layer and the upper electrode layer. The support members are disposed between the lower electrode layer and the upper electrode layer. The upper substrate is connected to the upper electrode layer, such that the upper electrode layer is located between the pixel layer and the upper substrate.

[0007] The cholesterol liquid crystal display device according to the aforementioned embodiment may further include a plurality of protective parts disposed between the lower substrate and the lower electrode layer.

[0008] According to the cholesterol liquid crystal display device of the aforementioned embodiment, the protective part can be positioned opposite the support member.

[0009] According to the cholesterol liquid crystal display device of the aforementioned embodiment, each support member has a first width, each protective part has a second width, and the second width may be greater than the first width.

[0010] The cholesterol liquid crystal display device according to the foregoing embodiment may further include a non-display area, which may include a plurality of metal wiring layers, a protective portion, and a non-display area support member. The metal wiring layers may be disposed on the surface of the lower substrate. The protective portion may be disposed on the metal wiring layers. The non-display area support member may be disposed between the upper and lower substrates, and located above the protective portion.

[0011] According to the cholesterol liquid crystal display device of the aforementioned embodiment, the width of each support member adjacent to the lower electrode layer may be smaller than the width of the support member adjacent to the upper electrode layer.

[0012] In the cholesterol liquid crystal display device according to the aforementioned embodiment, each support member may have a gap distance with the lower electrode layer.

[0013] Another embodiment of this disclosure provides a cholesteric liquid crystal display device, comprising a lower substrate, a plurality of element layers, a lower electrode layer, a pixel layer, an upper electrode layer, a plurality of support members, an upper substrate, and a plurality of matrix sections. The element layers are respectively disposed on a surface of the lower substrate. The lower electrode layer covers the surface of the lower substrate and the element layers. The pixel layer is connected to the lower electrode layer. The upper electrode layer is connected to the pixel layer, such that the pixel layer is sandwiched between the lower electrode layer and the upper electrode layer. The support members are disposed between the lower electrode layer and the upper electrode layer, and are respectively positioned opposite the element layers. The upper substrate is connected to the upper electrode layer, such that the upper electrode layer is located between the pixel layer and the upper substrate. The matrix sections are disposed between the upper electrode layer and the upper substrate, and are respectively positioned opposite the support members.

[0014] The cholesterol liquid crystal display device according to the aforementioned embodiment may further include a plurality of protective parts disposed between the lower substrate and the lower electrode layer.

[0015] According to the cholesterol liquid crystal display device of the aforementioned embodiment, the protective part can be located on the support member respectively, and the protective part can cover the element layer respectively.

[0016] According to the cholesterol liquid crystal display device of the aforementioned embodiment, each support member has a first width, each protective part has a second width, and the second width may be greater than the first width.

[0017] The cholesterol liquid crystal display device according to the foregoing embodiment may further include a non-display area, which may include a plurality of metal wiring layers, a protective portion, and a non-display area support member. The metal wiring layers may be disposed on the surface of the lower substrate. The protective portion may be disposed on the metal wiring layers. The non-display area support member may be disposed between the upper and lower substrates, and located above the protective portion.

[0018] According to the cholesterol liquid crystal display device of the aforementioned embodiment, the width of each support member adjacent to the lower electrode layer may be smaller than the width of the support member adjacent to the upper electrode layer.

[0019] In the cholesterol liquid crystal display device according to the aforementioned embodiment, each support member may have a gap distance with the lower electrode layer.

[0020] Accordingly, the cholesteric liquid crystal display device disclosed herein reduces or eliminates the structure between the lower electrode layer and the lower substrate while ensuring the complete functionality of the cholesteric liquid crystal display device, thereby significantly reducing reflected light at the lower electrode layer and the lower substrate, and thus improving the contrast and optical performance of the cholesteric liquid crystal display device. Simple Explanation of the Diagram

[0021] Figure 1 is a cross-sectional schematic diagram of the cholesterol liquid crystal display device according to the first embodiment of this disclosure; Figure 2 is a cross-sectional schematic diagram of the cholesterol liquid crystal display device according to the second embodiment of this disclosure; Figure 3 is a cross-sectional schematic diagram of the cholesterol liquid crystal display device according to the third embodiment of this disclosure; Figure 4 is a partial top view of the matrix section and protective section of the cholesterol liquid crystal display device in the third embodiment of Figure 3; and Figure 5 is a partial top view of the matrix section and protective section of a conventional cholesterol liquid crystal display device. Implementation

[0022] The various embodiments of this disclosure will be discussed in more detail below. However, this embodiment can be an application of various disclosed concepts and can be implemented in various different specific scopes. The specific embodiments are for illustrative purposes only and are not limited to the scope of the disclosure. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner, and repeated components may be represented by the same or similar numbers.

[0023] Please refer to Figure 1, which is a cross-sectional schematic diagram of the cholesteric liquid crystal display device 100 according to the first embodiment of this disclosure. The cholesteric liquid crystal display device 100 includes a lower substrate 110, a lower electrode layer 120, a pixel layer 130, an upper electrode layer 140, a plurality of support members 150, and an upper substrate 160.

[0024] In detail, the lower electrode layer 120 is disposed on a surface 110a of the lower substrate 110, the pixel layer 130 is connected to the lower electrode layer 120, and the upper electrode layer 140 is connected to the pixel layer 130, so that the pixel layer 130 is sandwiched between the lower electrode layer 120 and the upper electrode layer 140. Accordingly, the lower electrode layer 120 and the upper electrode layer 140 can be used to control the pixel layer 130 to display, and no other structural layer is disposed between the lower electrode layer 120 and the lower substrate 110, which can significantly reduce the reflected light at the lower electrode layer 120 and the lower substrate 110, thereby improving the contrast of the cholesteric liquid crystal display device 100.

[0025] A support member 150 is disposed between the lower electrode layer 120 and the upper electrode layer 140, and an upper substrate 160 is connected to the upper electrode layer 140, such that the upper electrode layer 140 is located between the pixel layer 130 and the upper substrate 160. Accordingly, the support member 150 can provide good support and maintain an appropriate spacing between the lower substrate 110 and the upper substrate 160. Furthermore, the width (not labeled) of each support member 150 adjacent to the lower electrode layer 120 can be smaller than the width (not labeled) of the adjacent upper electrode layer 140, so that each support member 150 has a trapezoidal structure as shown in Figure 1, but the present disclosure is not limited to the shape of the support member 150.

[0026] Please refer to Figure 2, which is a cross-sectional schematic diagram of the cholesterol liquid crystal display device 200 according to the second embodiment of this disclosure. In the second embodiment, the structural configuration of the cholesterol liquid crystal display device 200 is generally the same as or similar to that of the cholesterol liquid crystal display device 100 in the first embodiment, and the similarities will not be described in detail here.

[0027] The cholesterol liquid crystal display device 200 may further include a plurality of protective portions 270 disposed between the lower substrate 210 and the lower electrode layer 220. Each protective portion 270 may be located opposite a support member 250; that is, the protective portion 270 may be disposed only at positions corresponding to the support member 250. Accordingly, the protective portions 270 can provide protection at positions where the support member 250 is located, while simultaneously preventing excessive light reflection at positions where the support member 250 is not located, thus ensuring good optical performance of the cholesterol liquid crystal display device 200.

[0028] Furthermore, each support member 250 has a first width W1, and each protective portion 270 has a second width W2, and the second width W2 may be greater than the first width W1. Accordingly, the size of the protective portion 270 can be larger than the size of the support member 250 to provide a good protective effect.

[0029] Furthermore, each support member 250 may have a gap distance D between it and the lower electrode layer 220, so that the pixel layers 230 on both sides of the support member 250 remain connected, allowing the fluid medium of the pixel layer 230 to flow.

[0030] The cholesterol liquid crystal display device 200 may further include a non-display area A1, that is, the cholesterol liquid crystal display device 200 may include a non-display area A1 and a display area A2, and the pixel layer 230 is located in the display area A2. The non-display area A1 may include a plurality of metal wiring layers A11, a protective portion A12 and a non-display area support member A13. The metal wiring layers A11 may be disposed on the surface 210a of the lower substrate 210, the protective portion A12 may be disposed on the metal wiring layers A11, and the non-display area support member A13 may be disposed between the upper substrate 260 and the lower substrate 210, and located above the protective portion A12. Accordingly, the non-display area A1 can provide sufficient space for the configuration of circuits or other components.

[0031] It should be noted that the cholesterol liquid crystal display device 100 of the first embodiment and the cholesterol liquid crystal display device 200 of the second embodiment can be passive matrix liquid crystal display devices, which can control the liquid crystal arrangement through the mesh structure formed by the lower electrode layer 120 and the upper electrode layer 140 or the lower electrode layer 220 and the upper electrode layer 240.

[0032] Please refer to Figure 3, which is a cross-sectional schematic diagram of the cholesteric liquid crystal display device 300 according to the third embodiment of this disclosure. The cholesteric liquid crystal display device 300 includes a lower substrate 310, a plurality of element layers 380, a lower electrode layer 320, a pixel layer 330, an upper electrode layer 340, a plurality of support members 350, an upper substrate 360, and a plurality of matrix sections 390. The structural configuration of the lower substrate 310, lower electrode layer 320, pixel layer 330, upper electrode layer 340, support members 350, and upper substrate 360 ​​is generally the same as or similar to that of the cholesteric liquid crystal display device 100 of the first embodiment, and the similarities will not be described in detail here.

[0033] In detail, element layers 380 are respectively disposed on a surface 310a of the lower substrate 310, and the lower electrode layer 320 covers the surface 310a of the lower substrate 310 and the element layers 380, and the support members 350 are respectively located on the element layers 380. Accordingly, the required element layers 380 can be disposed between the lower electrode layer 320 and the lower substrate 310, while avoiding light reflection caused by the element layers 380 and affecting the optical performance of the cholesteric liquid crystal display device 300. Furthermore, the protective parts 370 can respectively cover the element layers 380 to provide a protective effect, while preventing the protective parts 370 from reflecting light.

[0034] Please refer to Figure 4, which is a partial top view of the matrix section 390 and the protective section 370 of the cholesteric liquid crystal display device 300 in the third embodiment of Figure 3. As shown in Figures 3 and 4, the matrix section 390 is disposed between the upper electrode layer 340 and the upper substrate 360, and the matrix section 390 is positioned opposite the support member 350. Accordingly, the matrix section 390 can be used to control the display of the pixel layer 330, and because the protective section 370 covers the element layer 380, the overlap between the protective section 370 and the pixel layer 330 is small, thus avoiding excessive light reflection caused by the protective section 370.

[0035] Furthermore, please refer to Figure 5, which is a partial top view of the matrix section 910 and the protective section 920 of a conventional cholesteric liquid crystal display device. As can be seen from Figures 4 and 5, the area occupied by the protective section 370 of the cholesteric liquid crystal display device 300 disclosed herein is smaller than that of the protective section 920 of a conventional cholesteric liquid crystal display device. Therefore, the reflected light caused by the protective section 370 can be significantly reduced, and the cholesteric liquid crystal display device 300 disclosed herein can have a superior contrast performance compared to conventional cholesteric liquid crystal display devices.

[0036] It should be noted that the cholesterol liquid crystal display device 300 of the third embodiment can be an active matrix liquid crystal display device, which can individually control the display of a single pixel in the pixel layer 330 through the matrix unit 390.

[0037] In summary, the cholesteric liquid crystal display device disclosed herein significantly reduces reflected light at the lower electrode layer and the lower substrate by reducing or eliminating the structure between the lower electrode layer and the lower substrate, while ensuring the complete functionality of the cholesteric liquid crystal display device, thereby improving the contrast and optical performance of the cholesteric liquid crystal display device.

[0038] Although the present disclosure has been presented above with reference to embodiments, it is not intended to limit the present disclosure. Anyone skilled in the art may make various modifications and alterations without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the appended claims.

[0039] 100, 200, 300: Cholesterol LCD display device 110,210,310: Lower base plate 110a, 210a, 310a: Surface 120, 220, 320: Lower electrode layer 130, 230, 330: Pixel layer 140, 240, 340: Upper electrode layer 150, 250, 350: Support components 160,260,360: Upper substrate 270, 370, 920, A12: Protection Department 380: Component Layer 390, 910: Matrix Section W1: First width W2: Second width D: Spacing distance A1: Non-display area A11: Metal trace layer A13: Support component for non-display area A2: Display Area

Claims

1. A cholesteric liquid crystal display device, comprising: a lower substrate; a lower electrode layer disposed on a surface of the lower substrate; a pixel layer connected to the lower electrode layer; an upper electrode layer connected to the pixel layer, such that the pixel layer is sandwiched between the lower electrode layer and the upper electrode layer; a plurality of support members disposed between the lower electrode layer and the upper electrode layer; and an upper substrate connected to the upper electrode layer, such that the upper electrode layer is located between the pixel layer and the upper substrate; wherein, The cholesterol liquid crystal display device further includes a plurality of protective portions disposed between the lower substrate and the lower electrode layer, and the protective portions are respectively positioned opposite the support members.

2. The cholesterol liquid crystal display device as claimed in claim 1, wherein each of the support members has a first width, each of the protective portions has a second width, and the second width is greater than the first width.

3. The cholesteric liquid crystal display device as claimed in claim 1 further includes a non-display area, the non-display area comprising: a plurality of metal trace layers disposed on the surface of the lower substrate; a protective portion disposed on the metal trace layers; and a non-display area support member disposed between the upper substrate and the lower substrate and located above the protective portion.

4. The cholesterol liquid crystal display device as claimed in claim 1, wherein the width of each support member adjacent to the lower electrode layer is smaller than the width adjacent to the upper electrode layer.

5. The cholesterol liquid crystal display device as claimed in claim 1, wherein each of the supports has a spacing distance from the lower electrode layer.

6. A cholesteric liquid crystal display device, comprising: a lower substrate; a plurality of element layers respectively disposed on a surface of the lower substrate; a lower electrode layer covering the surface of the lower substrate and the element layers; a pixel layer connected to the lower electrode layer; an upper electrode layer connected to the pixel layer, such that the pixel layer is sandwiched between the lower electrode layer and the upper electrode layer; a plurality of support members disposed between the lower electrode layer and the upper electrode layer, and the support members are respectively positioned opposite the element layers; an upper substrate connected to the upper electrode layer, such that the upper electrode layer is located between the pixel layer and the upper substrate; and a plurality of matrix portions disposed between the upper electrode layer and the upper substrate, and the matrix portions are respectively positioned opposite the support members; wherein... The cholesterol liquid crystal display device further includes a plurality of protective portions disposed between the lower substrate and the lower electrode layer, the protective portions being respectively located opposite the support members and respectively covering the element layers.

7. The cholesterol liquid crystal display device as claimed in claim 6, wherein each of the support members has a first width, each of the protective portions has a second width, and the second width is greater than the first width.

8. The cholesteric liquid crystal display device as claimed in claim 6 further includes a non-display area, the non-display area comprising: a plurality of metal trace layers disposed on the surface of the lower substrate; a protective portion disposed on the metal trace layers; and a non-display area support member disposed between the upper substrate and the lower substrate and located above the protective portion.

9. The cholesterol liquid crystal display device as claimed in claim 6, wherein the width of each support member adjacent to the lower electrode layer is smaller than the width adjacent to the upper electrode layer.

10. The cholesterol liquid crystal display device as claimed in claim 6, wherein each of the supports has a spacing distance from the lower electrode layer.

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