Cholesterol liquid crystal display device and cholesterol liquid crystal panel module therein

Abstract

The utility model discloses a cholesterol liquid crystal display device and a cholesterol liquid crystal panel module in the cholesterol liquid crystal display device. The panel module comprises a lower substrate, a lower insulation isolation layer, a lower transparent electrode layer, a cholesterol liquid crystal layer, an upper transparent electrode layer, an upper insulation isolation layer, an upper substrate, a black light blocking structure, a lower metal circuit structure and an upper metal circuit structure. The black light blocking structure is provided with a hollow first checkerboard pattern and is arranged below the upper substrate. The lower metal line structure is arranged above the lower substrate and comprises a plurality of parallel first metal lines. The upper metal line structure is arranged below the black light blocking structure and comprises a plurality of parallel second metal lines. The horizontal projections of the second metal wires and the first metal wires are perpendicular to each other and present a second checkerboard pattern. The lower transparent electrode layer and the upper transparent electrode layer are respectively provided with a plurality of first openings and second openings. The horizontal projection area of the first checkerboard pattern is larger than and covers the horizontal projection areas of the second checkerboard pattern, the first opening and the second opening.

Description

Technical Field

[0001] The present application relates to the field of liquid crystal display technology, and in particular to the optical structure technology of cholesteric liquid crystal panel modules. Background Art

[0002] Cholesteric liquid crystal is one of the main technologies used in e-book displays. Because its liquid crystal molecules have the characteristics of bistable display, they have the effect of saving electricity. The bistable characteristics of cholesteric liquid crystal molecules refer to the fact that they have two stable states in their natural state, one of which is the reflective state (Planar State) and the other is the transmissive state (Focal-Conic State). In the reflective state, the liquid crystals are arranged neatly and can reflect light of a specific wavelength, which is usually called the bright state. In the transmissive state, the liquid crystals are arranged in a disordered manner, and the incident light will penetrate or be scattered, and very little will be reflected, which is usually called the dark state. Electricity is only required when switching states (switching from the reflective state to the transmissive state, or from the transmissive state to the reflective state). When the image is still, almost no electricity is required, so the power saving effect is excellent.

[0003] Cholesteric liquid crystal panels typically feature lower and upper transparent electrode layers below and above 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. While conductive, their impedance is higher than that of ordinary metals. As the size of the cholesteric liquid crystal panel increases, the overall impedance of the lower and upper transparent electrode layers also increases, compromising circuit conduction efficiency and making control and driving more difficult. Summary of the Invention

[0004] The primary purpose of this application is to propose a cholesterol liquid crystal panel module, which is further provided with a lower metal circuit structure and an upper metal circuit structure corresponding to the lower transparent electrode layer and the upper transparent electrode layer, which can respectively reduce the impedance of the lower transparent electrode layer and the upper transparent electrode layer, thereby improving the efficiency of circuit conduction and control driving.

[0005] Another object of the present application is to propose a cholesterol liquid crystal panel module, which is further provided with a black light-blocking structure corresponding to the lower metal circuit structure and the upper metal circuit structure, which can block the reflection of the metal circuit structure, thereby improving the image quality and contrast of the liquid crystal display.

[0006] In order to achieve the purpose of this application, the first preferred embodiment of the present application proposes a cholesterol liquid crystal panel module, including a lower substrate, a lower insulating isolation layer, a lower transparent electrode layer, a cholesterol liquid crystal layer, an upper transparent electrode layer, an upper insulating isolation layer, and an upper substrate arranged in order from bottom to top. The cholesterol liquid crystal panel module also includes a black light-blocking structure, a lower metal circuit structure, and an upper metal circuit structure. The black light-blocking structure has a hollow first checkerboard pattern and is arranged below the upper substrate. The lower metal circuit structure is arranged above the lower substrate and includes a plurality of parallel first metal wires. The upper metal circuit structure is arranged below the black light-blocking structure and includes a plurality of parallel second metal wires. The horizontal projections of the second metal wires and the first metal wires are perpendicular to each other, forming a second checkerboard 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 at positions corresponding to the first checkerboard pattern. The horizontal projection area of the first checkerboard pattern is larger than and covers the horizontal projection area of the second checkerboard pattern, the first openings, and the second openings.

[0008] The present application further proposes a second preferred embodiment, which is a cholesteric liquid crystal display device comprising a plurality of stacked cholesteric liquid crystal panel modules, wherein the features of the cholesteric liquid crystal panel modules are as described in the cholesteric liquid crystal panel modules of the aforementioned first preferred embodiment.

[0009] The advantages and spirit of the present application can be further understood through the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The provided figures are used to provide a further understanding of the technical solutions of the present application. They constitute part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the provided figures are not and do not need to be drawn according to actual sizes. They are used to explain the embodiments of the present application and are not used to limit the implementation methods of the present application. For those of ordinary skill in the art, other figures can be derived from these figures without creative work. The provided figures include:

[0011] Figure 1 This is a schematic diagram of a cholesteric liquid crystal panel module according to the first preferred embodiment of the present application;

[0012] Figure 2 1 is a schematic diagram of the reflective shielding angle of the black light-blocking structure in the embodiment of the cholesteric liquid crystal panel module of the present application;

[0013] Figure 3 This is a schematic diagram of a cholesteric liquid crystal display device according to the second preferred embodiment of the present application.

[0014] Reference numerals:

[0015] 10: Cholesteric LCD panel module

[0016] 11: Lower base plate

[0017] 12: Upper substrate

[0018] 91: Lower insulation layer

[0019] 92: Upper insulation layer

[0020] 21: Lower transparent electrode layer

[0021] 22: Upper transparent electrode layer

[0022] 30: Cholesteric liquid crystal layer

[0023] 31: Liquid crystal spacer structure

[0024] 40: First checkerboard pattern

[0025] 51: First metal wire

[0026] 52: Second metal wire

[0027] 211: First Opening

[0028] 221: Second opening

[0029] θr: reflection angle of the lower metal circuit structure

[0030] W_bm: Line width of the first checkerboard pattern

[0031] W_m: width of the first metal line

[0032] D1: Distance from the edge of the second metal line to the side edge of the first checkerboard pattern

[0033] D2: The distance from the upper edge of the first metal wire to the lower edge of the first checkerboard pattern

[0034] D3: Distance from the upper surface of the lower substrate to the lower edge of the first checkerboard pattern

[0035] 100: Cholesteric liquid crystal display device DETAILED DESCRIPTION

[0036] The specific structural and functional details disclosed in the description of this application are merely representative and are for the purpose of describing exemplary embodiments of the present application. The present application can be specifically implemented in many alternative forms and should not be interpreted as being limited to only the embodiments disclosed herein.

[0037] It should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like in the description of this application indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. Except where the applicant specifically emphasizes and defines their functional roles, they are only for the convenience of describing this application, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as relative importance or the number of implied technical features. In the description of this application, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variations thereof all mean "at least including".

[0038] It should also be understood that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" in this application are to be understood broadly. For example, they may refer to fixed connections, detachable connections, or integrally formed connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal connections between two components. Persons of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0039] Unless the context clearly indicates otherwise, the terms "a", "an" and "an item" in the description of this application are also intended to include the plural. It should also be understood that the terms "include" and / or "comprise" stipulate the presence of the stated features, steps, operations, units and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, units, components and / or their combinations.

[0040] The first preferred embodiment proposed in this application is a cholesteric liquid crystal panel module 10, see Figure 1 The cholesteric liquid crystal panel module 10 includes, in order 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.

[0041] In the cholesteric liquid crystal layer 30, in order to maintain a certain liquid crystal layer thickness, a liquid crystal spacer structure 31 composed of organic or inorganic particles is used. The state of the liquid crystal molecules is controlled by voltage to form a reflective state or a transmissive state. In the transmissive state, in order to improve the contrast of the image, it is necessary to prevent the transmission of interlayer reflected light as much as possible. However, the existing liquid crystal spacer structure is transparent and non-optically active. The interlayer reflected light can easily penetrate the liquid crystal spacer structure, significantly reducing the contrast of the cholesteric liquid crystal panel and seriously affecting the display quality. To solve this problem, the cholesteric liquid crystal panel module 10 of the present application also includes a black light-blocking structure. The black light-blocking structure has a hollow first checkerboard pattern 40, which is arranged below the upper substrate 12 and corresponds to the liquid crystal spacer structure 31. The line width of the first checkerboard pattern 40 is also greater than the line width of the liquid crystal spacer structure 31. Since the upper substrate 12 is generally made of glass and has a relatively hard texture, and the upper insulating isolation layer 92 has a relatively soft texture, more specifically, the first checkerboard pattern 40 of the black light-blocking structure is recessed in the upper insulating isolation layer 92.

[0042] like Figure 1 As shown, the cholesteric liquid crystal panel module 10 further includes a lower metal circuit structure disposed above the lower substrate 11. The structure comprises a plurality of parallel first metal lines 51 corresponding to the first checkerboard pattern 40. More specifically, the first metal lines 51 are recessed within the lower insulating isolation layer 91, with their horizontal projections obscured by the horizontal projections of the first checkerboard pattern 40. The first metal lines 51 are electrically connected to the lower transparent electrode layer 21, with their other ends connected to the drive circuit, thereby reducing the overall impedance of the lower transparent electrode layer 21 between the drive circuit and the cholesteric liquid crystal layer 30.

[0043] The first metal wires 51 are made of metal. When external light penetrates the upper substrate 12 and the cholesteric liquid crystal layer 30 and strikes the first metal wires 51, it generates light reflections. Without a shield to block the light reflections, the light reflections would penetrate the cholesteric liquid crystal layer 30 and the upper substrate 12 and exit the display, severely impacting image contrast. Another purpose of the black light-blocking structure in this application is to block the light reflections from the first metal wires 51. Therefore, the horizontal projection area of the first checkerboard pattern 40 must be larger than and cover the horizontal projection area of the first metal wires 51.

[0044] like Figure 1As shown, the cholesteric liquid crystal panel module 10 also includes an upper metal circuit structure comprising a plurality of parallel second metal lines 52 disposed beneath the black light-blocking structure. More specifically, the second metal lines 52 are also recessed within the upper insulating isolation layer 92. The horizontal projections of the second metal lines 52 and the horizontal projections of the first metal lines 51 are perpendicular to each other, forming a second checkerboard pattern. The upper metal circuit structure 52 is electrically conductive to the upper transparent electrode layer 22 and, at its other end, is connected to the drive circuit, thereby reducing the overall impedance of the upper transparent electrode layer 22 between the drive circuit and the cholesteric liquid crystal layer 30. Furthermore, the first checkerboard pattern 40 of the black light-blocking structure must also block light reflections from the second metal lines 52. Therefore, the horizontal projection area of the first checkerboard pattern 40 must be larger than and cover the horizontal projection area of the second metal lines 52. More specifically, because the horizontal projections of the second metal lines 52 and the first metal lines 51 form the second checkerboard pattern, the horizontal projection area of the first checkerboard pattern 40 of the black light-blocking structure must be larger than and cover the horizontal projection area of the second checkerboard pattern.

[0045] Furthermore, Figure 1 As shown, the center line of the first metal line 51 and the center line of the upper metal circuit structure 52 are both aligned with the center line of the first checkerboard pattern 40 .

[0046] Better, such as Figure 1 As shown, the width of the first metal line 51 is the same as the width of the second metal line 52 .

[0047] In the present application, the lower transparent electrode layer 21 is provided with a plurality of first openings 211 at positions corresponding to the first checkerboard pattern 40; and the upper transparent electrode layer 22 is provided with a plurality of second openings 221 at positions corresponding to the first checkerboard pattern 40. More specifically, the first openings 211 and the second openings 221 correspond to the liquid crystal spacer structures 31. Therefore, the horizontal projection area of the first checkerboard pattern 40 must also be larger than the horizontal projection areas of the first openings 211 and the second openings 221, respectively.

[0048] Furthermore, in one embodiment, the first opening 211 and the second opening 221 have the same width, and their center lines are aligned with each other.

[0049] More specifically, Figure 1 As shown, the centerline of the second opening 221 does not coincide with the centerline of the first checkerboard pattern 40, and there is an offset between them that is greater than 0. At the same time, the centerline of the first opening 211 does not coincide with the centerline of the first checkerboard pattern 40, and there is also an offset between them that is greater than 0.

[0050] More specifically, in order to establish electrical conduction between the first metal line 51 and the lower transparent electrode layer 21, a portion of the horizontal projection of the first metal line 51 falls outside the horizontal projection of the first opening 211, such as Figure 1 At the same time, in order to establish electrical conduction between the second metal line 52 and the upper transparent electrode layer 22 , a portion of the horizontal projection of the second metal line 52 falls outside the horizontal projection of the second opening 221 .

[0051] In order to achieve a better reflection shielding effect, the line width of the first checkerboard pattern 40 of the black light-blocking structure must be wide enough to shield the reflection angle θr of the first metal line 51 to at least 30 degrees. Figure 2 As shown. That is to say, when the reflection angle θr at the outermost position of the first metal wire 51 reaches 30 degrees, it can still be shielded by the black light-blocking structure. In order to achieve this purpose, when the line center line of the first metal wire 51, the line center line of the second metal wire 52, and the line center line of the first checkerboard pattern 40 coincide with each other, let the line width of the first checkerboard pattern 40 be W_bm, the width of the first metal wire 51 and the second metal wire 52 be W_m, the distance from the side edge of the first checkerboard pattern 40 to the side edge of the second metal wire 52 be D1 = (W_bm-W_m) / 2, and the distance between the upper edge of the first metal wire 51 and the lower edge of the first checkerboard pattern 40 be D2, then θr must satisfy θr = Tan -1 The relationship between (D1 / D2)≥30°.

[0052] Since the thickness of the first metal wire 51 is very thin and difficult to measure, the above relationship can be changed to θr = Tan -1 (D1 / D3)≥30°, where D3 is the distance between the upper surface of the lower substrate 11 and the lower edge of the first checkerboard pattern 40.

[0053] Based on the same technical concept, the present application proposes a second preferred embodiment, which is a cholesteric liquid crystal display device 100, comprising a plurality of stacked cholesteric liquid crystal panel modules 10, such as Figure 3 The cholesteric liquid crystal panel module 10 is the cholesteric liquid crystal panel module 10 described in the first preferred embodiment.

[0054] The cholesteric liquid crystal panel module 10 and the cholesteric liquid crystal display device 100 proposed in this application have the following advantages:

[0055] 1. A lower metal circuit structure 51 is provided corresponding to the lower transparent electrode layer 21 , and an upper metal circuit structure 52 is provided corresponding to the upper transparent electrode layer 22 , which can reduce the impedance of the lower transparent electrode layer 21 and the upper transparent electrode layer 22 respectively, thereby improving the efficiency of circuit conduction and control driving.

[0056] Second, a black light-blocking structure 40 is provided corresponding to the lower metal circuit structure 51 and the upper metal circuit structure 52. The black light-blocking structure 40 can effectively block the light reflection of the metal circuit through a special width design, thereby improving the image quality and contrast of the cholesteric liquid crystal display.

[0057] The above detailed description of the preferred embodiments is intended to more clearly describe the features and spirit of the present application, and is not intended to limit the scope of the present application by the preferred embodiments disclosed above. On the contrary, its purpose is to cover various equivalent modifications within the scope of the claims to be applied for by this application.

Claims

1. A cholesteric liquid crystal panel module, comprising, arranged in order 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), characterized in that: The cholesteric liquid crystal panel module further includes a black light-blocking structure, a lower metal circuit structure and an upper metal circuit structure; The black light-blocking structure has a hollowed-out first checkerboard pattern (40) and is arranged below the upper substrate (12); The lower metal circuit structure is arranged above the lower substrate (11) and comprises a plurality of parallel first metal wires (51); The upper metal circuit structure is arranged below the black light-blocking structure and comprises a plurality of parallel second metal lines (52), wherein the horizontal projections of the second metal lines (52) and the first metal lines (51) are perpendicular to each other, forming a second checkerboard 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) at positions corresponding to the first checkerboard pattern (40); The horizontal projection area of the first checkerboard pattern (40) is larger than and covers the horizontal projection areas of the second checkerboard pattern, the first opening (211), and the second opening (221).

2. The cholesteric liquid crystal panel module according to claim 1, characterized in that: The first checkerboard pattern (40) and the second metal line (52) are recessed in the upper insulating isolation layer (92).

3. The cholesteric liquid crystal panel module according to claim 2, characterized in that: The first metal wire (51) is recessed in the lower insulating isolation layer (91).

4. The cholesteric liquid crystal panel module according to claim 1, characterized in that: The line center line of the first metal wire (51) is aligned with the line center line of the first checkerboard pattern (40).

5. The cholesteric liquid crystal panel module according to claim 4, characterized in that: The center line of the second metal line (52) is aligned with the center line of the first checkerboard pattern (40), and the first metal line (51) and the second metal line (52) have the same width.

6. The cholesteric liquid crystal panel module according to claim 5, characterized in that: The first opening (211) and the second opening (221) have the same width, and their center lines are aligned with each other.

7. The cholesteric liquid crystal panel module according to claim 6, characterized in that: There is an offset distance greater than 0 between the line center line of the second opening (221) and the line center line of the first checkerboard pattern (40).

8. The cholesteric liquid crystal panel module according to claim 7, characterized in that: A portion of the horizontal projection of the first metal wire (51) falls outside the horizontal projection of the first opening (211), and a portion of the horizontal projection of the second metal wire (52) falls outside the horizontal projection of the second opening (221).

9. The cholesteric liquid crystal panel module according to claim 8, characterized in that: The first checkerboard pattern (40) and the first metal wire (51) must satisfy Tan -1 (D1 / D3)≥30°, D1=(W_bm-W_m) / 2, W_bm is the line width of the first checkerboard pattern (40), W_m is the width of the first metal line (51), and D3 is the distance between the upper surface of the lower substrate (11) and the lower surface of the first checkerboard pattern (40).

10. A cholesteric liquid crystal display device comprising a plurality of stacked cholesteric liquid crystal panel modules, characterized in that: The cholesteric liquid crystal panel module is the cholesteric liquid crystal panel module according to any one of claims 1 to 9.

Images