A multicolor cholesteric liquid crystal display device

Abstract

The utility model discloses a multicolor cholesterol liquid crystal display device, include: first display module and second display module, first display module is located the top of second display module, first display module includes the glass cover plate of top, the first common substrate of bottom and the first cholesterol liquid crystal layer of clamping between both sides, and the glass cover plate bottom is equipped with the first array electrode layer, and the first array electrode layer includes a plurality of first pixel electrode and a plurality of first TFT switch of array distribution respectively with first pixel electrode is connected, and the first common substrate top is equipped with the first common electrode of cooperation with first pixel electrode, and the first cholesterol liquid crystal layer is used for reflecting the first color light, adopts cholesterol liquid crystal to reflect ambient light, and need not color filter layer can realize color display, and then will liquid crystal layer both sides common electrode and array electrode layer inversion, and array electrode layer and TFT device are integrated to the top glass cover plate, save single layer glass substrate structure, and need not the sticking procedure between glass substrate and cover plate, effectively reduce the overall thickness of whole display device, save material cost, improve the optical definition of display device.

Description

Technical Field

[0001] This utility model relates to the field of cholesterol liquid crystal display technology, and in particular to a multicolor cholesterol liquid crystal display device. Background Technology

[0002] Liquid crystal displays (LCDs) are widely used in many fields. To achieve color display, conventional LCDs have a color filter layer above the liquid crystal layer to filter the emitted light, and TFT transistors below the liquid crystal layer. By controlling the rotation of liquid crystals in different pixel units, different wavelengths of light are emitted to achieve different color displays.

[0003] Reflective liquid crystal displays (LCDs) achieve their display function by reflecting ambient light, allowing them to maintain image display even without a power supply, consuming power only when refreshing the image. Cholesterol LCDs are a typical example of reflective electronic paper, with a relatively simple structure and advantages in thickness and weight. Therefore, compared to traditional TFT LCDs and OLEDs, the most significant differences in electronic paper are its lighter weight, thinner profile, and energy efficiency.

[0004] Cholesterol liquid crystal is a special type of liquid crystal with a helical arrangement. This special arrangement is achieved by adding an optical oscillator to a nematic liquid crystal. The display effect is achieved by utilizing the two different polarized rotation states of cholesterol liquid crystal molecules at different potentials: "reflection" and "transmission." Cholesterol liquid crystal displays are typical reflective electronic paper devices. They do not require a backlight module; by adding optical oscillators with different pitches to the liquid crystal, they can reflect different colors of light, achieving color display.

[0005] In addition, such as Figure 1 As shown, a glass cover plate, with a thickness ranging from 0.7mm to 1.5mm, is typically installed on the top of the liquid crystal display module. This serves as a crucial protective barrier, preventing scratches and damage. The installation of the glass cover plate significantly increases the overall thickness of the cholesteric liquid crystal display device, and the gap between the cover plate and the top common substrate affects the optical path and efficiency of incident and reflected light. This means that existing cholesteric liquid crystal display devices do not offer significant advantages in terms of weight and material cost. Utility Model Content

[0006] To address the technical problems existing in the background art, this utility model proposes a multicolor cholesterol liquid crystal display device.

[0007] The present invention provides a multicolor cholesterol liquid crystal display device, comprising: a first display module and a second display module, wherein the first display module is located above the second display module;

[0008] The first display module includes a glass cover plate at the top, a first common substrate at the bottom, and a first cholesteric liquid crystal layer sandwiched between the two. The bottom of the glass cover plate is provided with a first array electrode layer, which includes a plurality of first pixel electrodes arranged in an array and a plurality of first TFT switches respectively connected to the first pixel electrodes. The top of the first common substrate is provided with a first common electrode that cooperates with the first pixel electrodes. The first cholesteric liquid crystal layer is used to reflect a first color light.

[0009] The second display module includes a second common substrate, a first array substrate, and a second cholesteric liquid crystal layer sandwiched between the two. The first array substrate has a second array electrode layer on the side facing the second cholesteric liquid crystal layer. The second array electrode layer includes a plurality of second pixel electrodes distributed in an array and a plurality of second TFT switches respectively connected to the second pixel electrodes. The second common substrate has a second common electrode on the side facing the second cholesteric liquid crystal layer that cooperates with the second pixel electrodes. The second cholesteric liquid crystal layer is used to reflect a second color light that is different from the first color light.

[0010] Preferably, the second common substrate is located above the first array substrate.

[0011] Preferably, the system further includes a third display module, which includes a third common substrate, a second array substrate, and a third cholesteric liquid crystal layer sandwiched between the two. The second array substrate has a third array electrode layer on the side facing the third cholesteric liquid crystal layer. The third array electrode layer includes a plurality of third pixel electrodes arranged in an array and a plurality of third TFT switches respectively connected to the third pixel electrodes. The third common substrate has a third common electrode on the side facing the third cholesteric liquid crystal layer that cooperates with the third pixel electrodes. The third cholesteric liquid crystal layer is used to reflect a third color light that is different from the first color light and the second color light.

[0012] Preferably, the first color light is blue light, the second color light is green light, and the third color light is red light.

[0013] Preferably, the third common substrate is located above the second array substrate.

[0014] Preferably, the liquid crystal display device has a light-absorbing layer at its bottom.

[0015] Preferably, two adjacent display modules are bonded together using OCA bonding.

[0016] The proposed multicolor cholesteric liquid crystal display device uses cholesteric liquid crystal to reflect ambient light, achieving color display without the need for a color filter layer. Furthermore, the common electrode and array electrode layer on both sides of the liquid crystal layer are inverted, and the array electrode layer and TFT devices are integrated onto the top glass cover plate, saving the single-layer glass substrate structure and eliminating the need for bonding between the glass substrate and the cover plate. This effectively reduces the overall thickness of the display device, saves material costs, and improves the optical clarity of the display device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a prior art cholesterol liquid crystal display device.

[0018] Figure 2 This is a schematic diagram of one embodiment of a multicolor cholesterol liquid crystal display device proposed in this utility model.

[0019] Figure 3 This is a schematic diagram of the structure of a single pixel unit of the array electrode layer in one embodiment of the multicolor cholesterol liquid crystal display device proposed in this utility model.

[0020] Figure 4 This is a schematic diagram of another embodiment of the multicolor cholesterol liquid crystal display device proposed in this utility model. Detailed Implementation

[0021] Reference Figure 2 and 3 The present invention proposes a multicolor cholesterol liquid crystal display device, comprising: a first display module and a second display module, wherein the first display module is located above the second display module;

[0022] The first display module includes a glass cover plate 1 at the top, a first common substrate 2 at the bottom, and a first cholesteric liquid crystal layer 3 sandwiched between the two. The bottom of the glass cover plate 1 is provided with a first array electrode layer 11, which includes a plurality of first pixel electrodes 4 arranged in an array and a plurality of first TFT switches 5 respectively connected to the first pixel electrodes 4. The top of the first common substrate 2 is provided with a first common electrode 6 that cooperates with the first pixel electrodes 4. The first cholesteric liquid crystal layer 3 is used to reflect first color light.

[0023] The second display module includes a second common substrate 7, a first array substrate 8, and a second cholesteric liquid crystal layer 9 sandwiched between the two. The first array substrate 8 has a second array electrode layer 10 on the side facing the second cholesteric liquid crystal layer 9. The second array electrode layer 10 includes a plurality of second pixel electrodes arranged in an array and a plurality of second TFT switches respectively connected to the second pixel electrodes. The second common substrate 7 has a second common electrode 16 on the side facing the second cholesteric liquid crystal layer 9 that cooperates with the second pixel electrodes. The second cholesteric liquid crystal layer 9 is used to reflect a second color light that is different from the first color light.

[0024] In the specific operation of the multicolor cholesteric liquid crystal display device of this embodiment, incident light enters the first cholesteric liquid crystal layer from above the first display module. The first TFT switch on the glass cover plate controls the switching and voltage of each first pixel electrode, driving the cholesteric liquid crystal of the corresponding pixel in the first liquid crystal layer to rotate, thereby realizing the pixel display function. Part of the light is reflected by the liquid crystal of the first cholesteric liquid crystal layer, realizing the display of the first color. Another part of the light passes through the first display module and enters the second display module. Similarly, the second TFT switch on the first array substrate controls the switching and voltage of each second pixel electrode, driving the cholesteric liquid crystal of the corresponding pixel in the second liquid crystal layer to rotate, thereby realizing the pixel display function and thus realizing the display of the second color.

[0025] In this embodiment, the proposed multicolor cholesteric liquid crystal display device uses cholesteric liquid crystal to reflect ambient light, achieving color display without the need for a color filter layer. Furthermore, the common electrode and array electrode layer on both sides of the liquid crystal layer are inverted, and the array electrode layer and TFT device are integrated onto the top glass cover plate, saving the single-layer glass substrate structure and eliminating the need for the bonding process between the glass substrate and the cover plate. This effectively reduces the overall thickness of the display device, saves material costs, and improves the optical clarity of the display device.

[0026] In this embodiment, the TFT cover glass is thicker than the TFT substrate of a conventional cholesteric liquid crystal display (LCD), and the driving electrodes are formed on the glass cover glass. By integrating the TFT driving circuit onto the glass cover glass, the thickness of one glass substrate is saved. This allows the overall thickness of the liquid crystal display device to be reduced by about 1 mm, and the estimated cost savings are about 20%. The stacking structure of this embodiment is simpler than the conventional stacking technology of liquid crystal display devices, resulting in lighter, thinner end-use products with better optical clarity. By eliminating one glass substrate and the bonding process, production costs are reduced and product yield is improved.

[0027] To achieve multi-color display, refer to Figure 4The multicolor cholesteric liquid crystal display device of this embodiment further includes a third display module. The third display module includes a third common substrate 12, a second array substrate 13, and a third cholesteric liquid crystal layer 14 sandwiched between the two. The second array substrate 13 has a third array electrode layer 15 on the side facing the third cholesteric liquid crystal layer 14. The third array electrode layer 15 includes a plurality of third pixel electrodes arranged in an array and a plurality of third TFT switches respectively connected to the third pixel electrodes. The third common substrate 12 has a third common electrode on the side facing the third cholesteric liquid crystal layer 14 that cooperates with the third pixel electrodes. The third cholesteric liquid crystal layer 14 is used to reflect a third color light that is different from the first color light and the second color light. In actual design, the first color light is blue light, the second color light is green light, and the third color light is red light. Color display is achieved by designing three cholesteric liquid crystal layers corresponding to the three primary colors.

[0028] In a specific implementation, the second common substrate 7 can be positioned above the first array substrate 8, according to a conventional display module structure. Similarly, the third common substrate 12 is positioned above the second array substrate 13.

[0029] When black needs to be displayed, the cholesteric liquid crystal is in a transmissive state. In order to ensure the black display effect, the bottom of the liquid crystal display device is provided with a light-absorbing layer 18 to absorb all the transmissive light.

[0030] To reduce light loss at the interface between adjacent display modules, in other embodiments, adjacent display modules are bonded together using OCA optical adhesive. In actual design, an OCA optical adhesive layer 17 is formed between adjacent display modules.

[0031] Compared with the conventional stacked structure distribution of liquid crystal display devices, this application has the following advantages;

[0032] 1) The design provides more space for other modules.

[0033] The proposed design, which integrates the TFT active driving circuitry into the glass cover, reduces the overall thickness of the LCD device by approximately 1mm. This design provides more space for other modules to meet mechanical structure requirements, ensuring smoother installation and removal of circuit boards and creating more possibilities for the design of the rear casing.

[0034] 2) Reduced weight of LCD display devices

[0035] The cover plate integration solution of this application saves the cost of one glass substrate and one bonding process, reducing the overall weight of the liquid crystal display device and ensuring that the end application products meet the market's demand for lighter, thinner and lower cost displays.

[0036] 3) Reduced material costs for liquid crystal display devices

[0037] By saving the cost of a glass substrate and a bonding process, the product yield is improved, the shipping efficiency is increased, and the material cost is reduced. It is estimated that the cost can be saved by about 20%, thus achieving the goal of cost reduction and efficiency improvement.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multicolor cholesterol liquid crystal display device, characterized in that, include: A first display module and a second display module, wherein the first display module is located above the second display module; The first display module includes a glass cover plate (1) at the top, a first common substrate (2) at the bottom, and a first cholesteric liquid crystal layer (3) sandwiched between the two. The bottom of the glass cover plate (1) is provided with a first array electrode layer (11). The first array electrode layer (11) includes a plurality of first pixel electrodes (4) distributed in an array and a plurality of first TFT switches (5) respectively connected to the first pixel electrodes (4). The top of the first common substrate (2) is provided with a first common electrode (6) that cooperates with the first pixel electrodes (4). The first cholesteric liquid crystal layer (3) is used to reflect the first color light. The second display module includes a second common substrate (7), a first array substrate (8), and a second cholesteric liquid crystal layer (9) sandwiched between the two. The first array substrate (8) has a second array electrode layer (10) on the side facing the second cholesteric liquid crystal layer (9). The second array electrode layer (10) includes a plurality of second pixel electrodes distributed in an array and a plurality of second TFT switches respectively connected to the second pixel electrodes. The second common substrate (7) has a second common electrode (16) on the side facing the second cholesteric liquid crystal layer (9) that cooperates with the second pixel electrodes. The second cholesteric liquid crystal layer (9) is used to reflect a second color light that is different from the first color light.

2. The multicolor cholesterol liquid crystal display device according to claim 1, characterized in that, The second common substrate (7) is located above the first array substrate (8).

3. The multicolor cholesterol liquid crystal display device according to claim 1, characterized in that, It also includes a third display module, which includes a third common substrate (12), a second array substrate (13) and a third cholesteric liquid crystal layer (14) sandwiched between the two. The second array substrate (13) has a third array electrode layer (15) on the side facing the third cholesteric liquid crystal layer (14). The third array electrode layer (15) includes a plurality of third pixel electrodes distributed in an array and a plurality of third TFT switches respectively connected to the third pixel electrodes. The third common substrate (12) has a third common electrode on the side facing the third cholesteric liquid crystal layer (14) that cooperates with the third pixel electrodes. The third cholesteric liquid crystal layer (14) is used to reflect a third color light that is different from the first color light and the second color light.

4. The multicolor cholesterol liquid crystal display device according to claim 3, characterized in that, The first color light is blue light, the second color light is green light, and the third color light is red light.

5. The multicolor cholesterol liquid crystal display device according to claim 3, characterized in that, The third common substrate (12) is located above the second array substrate (13).

6. The multicolor cholesterol liquid crystal display device according to claim 1, characterized in that, The liquid crystal display device has a light-absorbing layer (18) at the bottom.

7. The multicolor cholesterol liquid crystal display device according to claim 1 or 3, characterized in that, The two adjacent display modules are bonded together using OCA bonding.

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