Cholesteric liquid crystal display device and its cholesteric liquid crystal panel module

Abstract

A cholesteric liquid crystal display device and a cholesteric liquid crystal panel module thereof are provided. [Solution] The panel module includes a lower substrate (11), a lower insulating isolation layer (91), a lower transparent electrode layer (21), a cholesteric liquid crystal layer (30), an upper transparent electrode layer (22), an upper insulating isolation layer (92), an upper substrate (12), a black light-shielding structure, a lower metal wiring structure, and an upper metal wiring structure. The black light-shielding structure has a watermarked first lattice pattern and is located below the upper substrate. The lower metal wiring structure is located above the lower substrate and includes a plurality of parallel first metal lines. The upper metal wiring structure is located below the black light-shielding structure and includes a plurality of parallel second metal lines. The horizontal projections of the second metal lines and the first metal lines are perpendicular to each other, and the projections of the two form a second lattice pattern. The upper and lower transparent electrode layers are respectively provided with a plurality of first openings and second openings. The horizontal projection area of the first lattice pattern is larger than the horizontal projection areas of the second lattice pattern, the first openings, and the second openings, respectively, and they are obscured.

Description

[Technical Field]

[0001] The present invention relates to liquid crystal display technology, and more particularly to the optical structure of a cholesteric liquid crystal panel module. [Background technology]

[0002] Cholesteric liquid crystals are one of the main technologies used in e-book displays. Liquid crystal molecules possess bi-stable display properties, which contribute to power saving. The bi-stable property of cholesteric liquid crystal molecules means that they naturally exist in two stable states: a planar state and a focal-conic state. In the planar state, the liquid crystals are arranged in an orderly fashion and can reflect light of specific wavelengths, commonly referred to as the bright state. In the focal-conic state, the liquid crystals are arranged in a disorderly fashion, transmitting or scattering incident light and rarely reflecting it, commonly referred to as the dark state. Only during transitions (from the planar state to the focal-conic state or vice versa) is electricity required; when the screen is static, almost no power is consumed, resulting in excellent power saving.

[0003] Cholesteric liquid crystal panels typically have a lower transparent electrode layer and an upper transparent electrode layer above and below the liquid crystal layer, respectively, to provide the voltage required for the cholesteric liquid crystal molecules to transition. The transparent electrodes are typically made of conductive metal oxides, which, although conductive, ultimately have a higher resistance than ordinary metals. As the size of cholesteric liquid crystal panels increases, the overall resistance of the lower and upper transparent electrode layers also increases accordingly, which is detrimental to the circuit's conduction efficiency and makes drive control more difficult, so further improvement was needed. Summary of the Invention [Problem to be solved by the invention]

[0004] The first objective of the present invention is to provide a cholesteric liquid crystal panel module that reduces the resistance of the lower transparent electrode layer and the upper transparent electrode layer by installing a lower metal wiring structure and an upper metal wiring structure corresponding to the lower transparent electrode layer and the upper transparent electrode layer, respectively, thereby improving the efficiency of circuit conduction and drive control.

[0005] The second objective of the present invention is to provide a cholesteric liquid crystal panel module that can improve the image quality and contrast of the LCD screen by adding a black light-shielding structure to the lower metal wiring structure and the upper metal wiring structure to block reflections from the metal wiring. [Means for solving the problem]

[0006] To achieve the above objectives, a first best embodiment of the present invention provides a cholesteric liquid crystal panel module, which includes, arranged from bottom to top, a lower substrate, a lower insulating isolation layer, a lower transparent electrode layer, a cholesteric liquid crystal layer, an upper transparent electrode layer, an upper insulating isolation layer, and an upper substrate. The cholesteric liquid crystal panel module further includes a black light-shielding structure, a lower metal wiring structure, and an upper metal wiring structure. The black light-shielding structure has a first watermark lattice pattern and is located below the upper substrate. The lower metal wiring structure is located above the lower substrate and includes a plurality of parallel first metal lines. The upper metal wiring structure is located below the black light-shielding structure and includes a plurality of parallel second metal lines. The horizontal projections of the second metal lines and the first metal lines are perpendicular to each other, forming a second lattice pattern.

[0007] The lower transparent electrode layer and the upper transparent electrode layer are respectively provided with a plurality of first openings and a plurality of second openings corresponding to the positions of the first grid pattern, and the horizontal projected area of the first grid pattern is greater than the horizontal projected areas of the second grid pattern, the first openings, and the second openings, respectively, and cover them.

[0008] The present invention further provides a second best embodiment of a cholesteric liquid crystal display device, which includes a plurality of stacked cholesteric liquid crystal panel modules, wherein the cholesteric liquid crystal panel modules have the same characteristics as the cholesteric liquid crystal panel module of the first best embodiment. [Effects of the Invention]

[0009] The cholesteric liquid crystal display device and cholesteric liquid crystal panel module provided by the present invention reduce the resistance of the lower transparent electrode layer and the upper transparent electrode layer, thereby improving the efficiency of circuit conduction and drive control. Furthermore, the installation of a black shading structure can block reflections from the metal wiring, thereby improving the image quality and contrast of the LCD screen. [Brief explanation of the drawings]

[0010] The drawings provided are for the purpose of providing a better understanding of the embodiments of the present invention, showing the embodiments of the present invention and explaining the principles of the present invention together with the text. The drawings below do not limit the implementation of the present invention, and those skilled in the art can derive other drawings based on these drawings without any creative effort. [Figure 1] 1 is a schematic diagram of a cholesteric liquid crystal panel module according to a first preferred embodiment of the present invention; [Figure 2] 3 is a schematic diagram illustrating the reflected light blocking angle of the black light blocking structure in the preferred embodiment of the cholesteric liquid crystal panel module of the present invention. [Figure 3] 2 is a schematic diagram of a cholesteric liquid crystal display device according to a second preferred embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0011] The structure, features and effects of the present invention will be described in detail below with reference to the best embodiment and drawings.

[0012] The specific structural and functional details disclosed in the present invention are merely representative and are used to explain the embodiments of the present invention, and the present invention can be embodied in various modified forms and is not limited to the embodiments disclosed herein.

[0013] Terms used in this invention, such as "center," "lateral," "up," "down," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside," indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings. Except where the applicant specifically emphasizes or limits the role of a function, these terms are used merely for the convenience of describing this invention and are not intended to indicate or suggest a specific orientation or specific directional structure and operation of a specified device or component. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and do not indicate relative importance. Unless otherwise clearly indicated by the context, the terms "one" and "item" in this invention also include the plural.

[0014] Unless otherwise expressly specified or limited, the terms "attached," "adjacent," and "connected" in this invention shall be interpreted broadly. For example, a fixed connection may be a detachable connection or a connection formed by integral molding, and may be interpreted broadly to mean a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or communication between the interiors of two components. A person skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. [Example]

[0015] The first best embodiment of the present invention is a cholesteric liquid crystal panel module 10, as shown in Figure 1. The cholesteric liquid crystal panel module 10 includes, arranged from bottom to top, a lower substrate 11, a lower insulating isolation layer 91, a lower transparent electrode layer 21, a cholesteric liquid crystal layer 30, an upper transparent electrode layer 22, an upper insulating isolation layer 92, and an upper substrate 12.

[0016] To maintain a consistent liquid crystal layer thickness, the cholesteric liquid crystal layer 30 employs liquid crystal spacing structures 31 composed of organic or inorganic particles. The state of the liquid crystal molecules is controlled via voltage to form either a planar state or a focal conic state. In the focal conic state, interlayer reflected light must be prevented from passing through as much as possible to improve screen contrast. However, conventional liquid crystal spacing structures are transparent and non-optically rotatory, allowing interlayer reflected light to easily pass through the liquid crystal spacing structures, significantly reducing the contrast of the cholesteric liquid crystal panel and significantly affecting display quality. To address this issue, the cholesteric liquid crystal panel module 10 of the present invention further includes a black light-shielding structure. The black light-shielding structure has a watermarked first lattice pattern 40 and is located below the upper substrate 12, corresponding to the liquid crystal spacing structures 31. The line width of the first lattice pattern 40 is greater than that of the liquid crystal spacing structures 31. The upper substrate 12 is generally made of glass, which has high hardness, while the upper insulating isolation layer 92 has a softer texture. Therefore, more specifically, the first lattice pattern 40 with a black light-blocking structure is recessed into the upper insulating isolation layer 92.

[0017] 1 , the cholesteric liquid crystal panel module further includes a lower metal wiring structure disposed above the lower substrate 11, which includes a plurality of parallel first metal lines 51 and corresponds to the first lattice pattern 40. More specifically, the first metal lines 51 are recessed in the lower insulating isolation layer 91, and their horizontal projections are covered by the horizontal projections of the first lattice pattern 40. The first metal lines 51 are electrically connected to the lower transparent electrode layer 21, and the other end is connected to the driving circuit, so that the lower transparent electrode layer 21 reduces the overall resistance between the driving circuit and the cholesteric liquid crystal layer 30.

[0018] The first metal wires 51 are made of metal, and when an external light source passes through the upper substrate 12 and the cholesteric liquid crystal layer 30 and shines on the first metal wires 51, reflected light is generated. If there is nothing to block the reflected light, the reflected light will pass through the cholesteric liquid crystal layer 30 and the upper substrate 12 and exit the display screen, which will have a significant impact on the contrast of the screen. Another purpose of the black light-shielding structure of the present invention is to block the reflected light from the first metal wires 51, so the horizontal projected area of the first lattice pattern 40 must be larger than the horizontal projected area of the first metal wires 51 and must be obscured.

[0019] As shown in FIG. 1 , the cholesteric liquid crystal panel module further includes an upper metal wiring structure having a plurality of parallel second metal lines 52, which is disposed below the black light-shielding structure. More specifically, the second metal lines 52 are also recessed into the upper insulating isolation layer 92. The horizontal projections of the second metal lines 52 and the first metal lines 51 are perpendicular to each other, forming a second lattice pattern. The upper metal wiring structure 52 is electrically connected to the upper transparent electrode layer 22, and the other end is connected to the driving circuit, so that the upper transparent electrode layer 22 reduces the overall resistance between the driving circuit and the cholesteric liquid crystal layer 30. At the same time, the first lattice pattern 40 of the black light-shielding structure also needs to shield the reflected light from the second metal lines 52. Therefore, the horizontal projection area of the first lattice pattern 40 must be larger than and cover the horizontal projection area of the second metal lines 52. More specifically, the horizontal projection of the second metal wire 52 and the horizontal projection of the first metal wire 51 form the second lattice pattern, so the horizontal projection area of the first lattice pattern 40 with the black light-blocking structure must be larger than the horizontal projection area of the second lattice pattern and must be concealed.

[0020] Furthermore, as shown in FIG. 1, the center line of the first metal line 51 and the center line of the upper metal wiring structure 52 are both aligned with the center line of the first lattice pattern 40 .

[0021] As shown in FIG. 1, more preferably, the width of the first metal line 51 is the same as the width of the second metal line 52 .

[0022] In the present invention, the lower transparent electrode layer 21 has a plurality of first openings 211 corresponding to the positions of the first lattice pattern 40. The upper transparent electrode layer 22 has a plurality of second openings 221 corresponding to the positions of the first lattice pattern 40. More specifically, since the first openings 211 and the second openings 221 correspond to the liquid crystal spacing structures 31, the horizontal projection area of the first lattice pattern 40 also needs to be larger than the horizontal projection areas of the first openings 211 and the second openings 221, respectively.

[0023] Furthermore, in one embodiment, the first opening 211 and the second opening 221 have the same width, and the centerlines of both openings are aligned with each other.

[0024] 1, the center line of the second opening 221 and the center line of the first lattice design 40 do not overlap, and there is a deviation between them that is greater than 0. At the same time, the center line of the first opening 211 and the center line of the first lattice design 40 do not overlap, and there is also a deviation between them that is greater than 0.

[0025] 1 , in order to establish an electrical connection between the first metal wire 51 and the lower transparent electrode layer 21, a portion of the horizontal projection of the first metal wire 51 is located outside the horizontal projection of the first opening 211. At the same time, in order to establish an electrical connection between the second metal wire 52 and the upper transparent electrode layer 22, a portion of the horizontal projection of the second metal wire 52 is located outside the horizontal projection of the second opening 221.

[0026] To achieve a better reflected light blocking effect, the line width of the first lattice pattern 40 of the black light blocking structure should be wide enough so that the reflected light angle θr that can block the first metal line 51 reaches at least 30 degrees, as shown in FIG. 2. That is, even when the reflected light angle θr at the end of the first metal line 51 reaches 30 degrees, it can still be blocked by the black light blocking structure. θr = Tan -1 (D1 / D2) ≧ 30° To achieve this, when the center line of the first metal wire 51, the center line of the second metal wire 52, and the center line of the first lattice pattern 40 overlap, The line width of the first grid pattern 40 is W_bm, The width of the first metal line 51 and the second metal line 52 is W_m, The distance from the end of the first lattice pattern 40 to the end of the second metal line 52 is D1=(W_bm-W_m) / 2; The distance from the top end of the first metal wire 51 to the bottom end of the first lattice pattern 40 is D2, and θr is θr = Tan -1 The following formula must be satisfied: (D1 / D2) ≥ 30°.

[0027] Since the thickness of the first metal wire 51 is extremely thin and difficult to measure, the above equation is -1 The angle can be changed to (D1 / D3)≧30°, where D3 is the distance from the top surface of the lower substrate 11 to the bottom edge of the first lattice pattern 40.

[0028] Based on the same technical idea, the present invention also provides a second best embodiment, as shown in Figure 3, which is a cholesteric liquid crystal display device 100 including a plurality of stacked cholesteric liquid crystal panel modules 10. The cholesteric liquid crystal panel modules 10 are the cholesteric liquid crystal panel modules 10 described in the first best embodiment.

[0029] The cholesteric liquid crystal panel module 10 and the cholesteric liquid crystal display device 100 provided by the present invention have the following advantages:

[0030] First, by installing a first metal wire 51 corresponding to the lower transparent electrode layer 21 and installing an upper metal wiring structure 52 corresponding to the upper transparent electrode layer 22, the resistance of the lower transparent electrode layer 21 and the upper transparent electrode layer 22 can be reduced, respectively, and the efficiency of circuit conduction and drive control can be improved.

[0031] Second, a black light-shielding structure is provided corresponding to the first metal line 51 and the upper metal wiring structure 52. The black light-shielding structure has a watermarked first lattice pattern 40, which can block the reflected light from the metal wiring, thereby improving the image quality and contrast of the cholesteric liquid crystal display.

[0032] The detailed description of the best embodiment above is intended to more clearly explain the features and spirit of the present invention, and is not intended to limit the scope of the present invention. Even if a person skilled in the art makes changes or adjustments within the scope of the present invention, the important meaning of the present invention will not be lost and will still be included in the scope of the present invention. [Explanation of symbols]

[0033] 10 Cholesteric LCD panel module 11 Lower board 12 Upper board 91 Lower insulating isolation layer 92 Upper insulating isolation layer 21 Lower transparent electrode layer 22 Upper transparent electrode layer 30 Cholesteric liquid crystal layer 31 Liquid crystal spacing structure 40 First lattice design 51 Daiichi Metal Line 52 Second Golden Line 211 First opening 221 Second opening θr: Reflection angle of the lower metal wiring structure W_bm Line width of the first grid pattern W_m Width of the first metal line D1: Distance from the edge of the second metal wire to the side of the first grid pattern D2: Distance from the top edge of the first metal wire to the bottom edge of the first grid pattern D3 Distance from the top surface of the lower board to the bottom edge of the first lattice pattern 100 Cholesteric liquid crystal display device

Claims

1. The device is configured in the order from bottom to top: one lower substrate 11, one lower insulating isolation layer 91, one lower transparent electrode layer 21, one cholesteric liquid crystal layer 30, one upper transparent electrode layer 22, one upper insulating isolation layer 92, and one upper substrate 12. The device is characterized by the following features: the cholesteric liquid crystal panel module further includes a black light-shielding structure, a lower metal wiring structure, and an upper metal wiring structure; The black light-blocking structure has a first watermark lattice pattern 40 and is disposed below the upper substrate 12; The lower metal wiring structure is disposed above the lower substrate 11 and includes a plurality of parallel first metal lines 51; the upper metal wiring structure is disposed below the black light-shielding structure, and includes a plurality of parallel second metal lines 52, the horizontal projections of the second metal lines 52 and the first metal lines 51 being perpendicular to each other, forming a second grid pattern; The lower transparent electrode layer 21 and the upper transparent electrode layer 22 are respectively provided with a plurality of first openings 211 and a plurality of second openings 221 corresponding to the first lattice pattern 40; the horizontal projection area of the first lattice pattern 40 is greater than the horizontal projection areas of the second lattice pattern, the first opening 211, and the second opening 221, respectively, and obscures them; The first lattice pattern 40 and the second metal line 52 are recessed in the upper insulating isolation layer 92, and the first metal line 51 is recessed in the lower insulating isolation layer 92.

2. 2. The cholesteric liquid crystal panel module of claim 1, wherein the first opening 211 and the second opening 221 have the same width, and their center lines are aligned with each other, and the deviation between the center line of the second opening 221 and the center line of the first lattice pattern 40 is greater than 0, and a portion of the horizontal projection of the first metal line 51 is outside the horizontal projection of the first opening 211, and a portion of the horizontal projection of the second metal line 52 is outside the horizontal projection of the second opening 221.

3. The first grid pattern 40 and the first metal wire 51 are made of Tan -1 3. The cholesteric liquid crystal panel module of claim 2, wherein (D1 / D3)≧30° must be satisfied, wherein D1=(W_bm-W_m) / 2, W_bm is the line width of the first lattice pattern 40, W_m is the width of the first metal line 51, and D3 is the distance from the top surface of the lower substrate 11 to the bottom surface of the first lattice pattern 40.

4. A cholesteric liquid crystal display device comprising a plurality of stacked cholesteric liquid crystal panel modules, wherein the cholesteric liquid crystal panel modules are the cholesteric liquid crystal panel modules according to any one of claims 1 to 3.

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