A reflective liquid crystal display device and its front cover plate assembly

Abstract

This utility model discloses a reflective liquid crystal display device and its front cover plate assembly. The cover plate body has an outer side and an inner side. The LED light source and the light guide strip are both disposed on the inner side of the cover plate body, with the LED light source located on one side of the light guide strip. The light emitted from the LED light source passes through the light guide strip, enters the cover plate body through the inner side, and then is uniformly illuminated by the cover plate body before exiting from the inner side. By moving the LED light source from the end of the cover plate to the inner side of the cover plate, the supplementary light is incident into the interior of the cover plate through the light guide component, without affecting the outer frame structure, and effectively preventing light leakage from the LED at the edge of the outer frame. In addition, the LED light source is directly installed and fitted with the cover plate, and the gap between the two is not affected by the assembly, ensuring the incident efficiency of the light emitted from the light source entering the cover plate.

Description

Technical Field

[0001] This utility model relates to the field of reflective liquid crystal display technology, and in particular to a reflective liquid crystal display device and its front light cover assembly. Background Technology

[0002] In recent years, reflective displays have combined the advantages of paper with the information-updating capabilities of electronic devices, leading to their widespread adoption. Take cholesteric liquid crystal displays (LCDs) as an example. Cholesteric liquid crystals possess bistable, high contrast, and high color accuracy. They utilize ambient light reflection for imaging, requiring power to refresh the image only when the screen changes. Furthermore, cholesteric LCDs can maintain their display even without an applied voltage. Therefore, reflective LCDs exhibit excellent power-saving characteristics.

[0003] However, in environments with low ambient light, reflective displays suffer from insufficient incident light, affecting display quality. To address this issue, an LED light source is typically installed on the front light cover. The LED light source is fixed to the end of the front light cover by an outer frame, which also protects the LED. The light emitted from the LED light source is evenly distributed through the front light cover before entering the liquid crystal module, achieving a supplementary lighting effect. Figure 1 As shown. This design has the following defects: (1) The front light cover is the surface structure of the front light module. Adding an LED light source to the end face requires an additional LED light source protection structure, which will affect the cover plate bonding and related outer frame structure design, making the outer frame structure more complicated; (2) There is an assembly gap between the LED light source and the front light cover. The gap distance is uncontrollable and affects the light guiding effect; (3) There is light leakage between the outer frame structure and the LED light source, which affects the display effect. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a reflective liquid crystal display device and its front light cover assembly.

[0005] This utility model proposes a front light cover plate assembly for a reflective liquid crystal display device, comprising: a cover plate body, an LED light source, and a light guide strip;

[0006] The cover plate body has an outer side and an inner side. The LED light source and the light guide strip are both set on the inner side of the cover plate body, and the LED light source is located on one side of the light guide strip. The light emitted by the LED light source enters the cover plate body through the light guide strip and the inner side, and then is uniformly emitted from the inner side after being uniformly emitted by the cover plate body.

[0007] Preferably, the light guide strip has a wedge-shaped structure, and the light guide strip has a first optical surface, a second optical surface and a third optical surface. The first optical surface is located on the side of the light guide strip close to the cover plate body, the LED light source is located on the side of the second optical surface of the light guide strip, and the third optical surface is a reflective surface.

[0008] Preferably, the light guide strip is fixedly connected to the cover plate body by optical adhesive.

[0009] And / or, the LED light source is fixed to the cover plate body by optical adhesive.

[0010] Preferably, the optical adhesive is OCA optical adhesive.

[0011] Preferably, it also includes a reflective film that covers the third optical surface of the light guide strip.

[0012] Preferably, the reflective film includes a first reflective portion and a second reflective portion, the first reflective portion covering a third optical surface, and the second reflective portion extending from one end of the first reflective portion to cover part of the inner side of the cover plate body.

[0013] In this invention, the proposed front cover plate assembly for a reflective liquid crystal display device has an outer and inner side. The LED light source and light guide strip are both located on the inner side of the cover plate, with the LED light source positioned on one side of the light guide strip. Light emitted from the LED light source passes through the light guide strip, enters the cover plate through the inner side, and then, after being uniformly diffused by the cover plate, exits from the inner side. By moving the LED light source from the end of the cover plate to the inner side, supplementary light is directed into the cover plate via the light guide, without affecting the outer frame structure. This effectively prevents light leakage from the LED at the outer frame edge. Furthermore, the LED light source is directly mounted to the cover plate, and the gap between them is unaffected by the assembly, ensuring the incident efficiency of the emitted light entering the cover plate.

[0014] This utility model also includes a reflective liquid crystal display device, comprising the aforementioned front light cover assembly.

[0015] Preferably, it also includes a reflective liquid crystal module and an outer frame;

[0016] The outer frame has a display window, and the reflective liquid crystal module is located inside the display window. The cover plate body is installed on the outer frame and covers the display window. The LED light source and light guide strip are located on the side of the cover plate body close to the reflective liquid crystal module.

[0017] Preferably, the outer frame is provided with a support structure, and the support structure is provided with cover plate fixing adhesive, and the cover plate body is fixed to the support structure by cover plate fixing adhesive.

[0018] Preferably, the light guide strip has a wedge-shaped structure and is located on the side of the LED light source away from the supporting structure.

[0019] The reflective liquid crystal display device proposed in this invention has similar technical effects to the aforementioned front light cover assembly, so it will not be described in detail here. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the structure of a reflective liquid crystal display device in the prior art.

[0021] Figure 2 This is a schematic diagram of one embodiment of the front light cover plate assembly of a reflective liquid crystal display device proposed in this utility model.

[0022] Figure 3 This is a schematic diagram of one embodiment of a reflective liquid crystal display device proposed in this utility model.

[0023] Figure 4 This is a schematic diagram of the optical path of one embodiment of a reflective liquid crystal display device proposed in this utility model.

[0024] Figure 5 This is a schematic diagram of another embodiment of the front light cover plate assembly of a reflective liquid crystal display device proposed in this utility model.

[0025] Figure 6 This is a partial structural schematic diagram of one embodiment of the front light cover plate assembly of a reflective liquid crystal display device proposed in this utility model. Detailed Implementation

[0026] Reference Figure 2 and 3 The present invention proposes a front light cover plate assembly for a reflective liquid crystal display device, comprising: a cover plate body 1, an LED light source 2, and a light guide strip 3;

[0027] The cover plate body 1 has an outer side and an inner side. The LED light source 2 and the light guide strip 3 are both set on the inner side of the cover plate body 1, and the LED light source 2 is located on one side of the light guide strip 3. The light emitted from the LED light source 2 enters the cover plate body 1 through the light guide strip 3 via the inner side, and then exits from the inner side after being uniformly illuminated by the cover plate body 1.

[0028] To illustrate the front light cover assembly of this embodiment in detail, this embodiment also proposes a reflective liquid crystal display device, including the aforementioned front light cover assembly. Specifically, it further includes a reflective liquid crystal module 300 and an outer frame 200; the outer frame 200 is provided with a display window, the reflective liquid crystal module 300 is located within the display window, the cover body 1 is mounted on the outer frame 200 and covers the display window, and the LED light source 2 and the light guide strip 3 are located on the side of the cover body 1 near the reflective liquid crystal module 300.

[0029] In a reflective liquid crystal display (LCD), ambient light enters from the outside through the cover plate and reaches the reflective liquid crystal module within the display window. Inside the module, applying a suitable voltage to the liquid crystal layer causes the liquid crystal molecules to rotate, thus controlling their state and switching between reflection and transmission of incident light. The light reflected by the liquid crystal returns through the front cover plate for display. Figure 4 As shown, when the ambient light is insufficient, the light emitted by the LED light source enters the front light cover through the light guide strip. After being uniformly distributed within the cover, the light is emitted from the side closest to the LCD module along with the ambient light and enters the LCD module to achieve the supplementary lighting function.

[0030] In this embodiment, the proposed reflective liquid crystal display device and its front cover plate assembly have an outer and inner side. The LED light source and light guide strip are both disposed on the inner side of the cover plate, with the LED light source located on one side of the light guide strip. Light emitted from the LED light source passes through the light guide strip, enters the cover plate through the inner side, and then is uniformly diffused by the cover plate before exiting from the inner side. By moving the LED light source from the end of the cover plate to the inner side, supplementary light is incident into the cover plate through the light guide, without affecting the outer frame structure. This effectively prevents light leakage from the LED at the outer frame edge. Furthermore, the LED light source is directly mounted to the cover plate, and the gap between them is not affected by the assembly, ensuring the incident efficiency of the emitted light entering the cover plate.

[0031] In the specific installation method of the front light cover assembly, the outer frame 200 is provided with a support structure 201 located at the outer edge of the display window. The support structure 201 is provided with cover plate fixing adhesive 202, and the cover plate body 1 is fixed to the support structure 201 by the cover plate fixing adhesive 202. Without the need for complex structural design, the entire device can be made flat, while eliminating assembly gaps and light leakage problems.

[0032] To avoid the light guide strip significantly affecting the overall thickness of the display device, the light guide strip 3 has a wedge-shaped structure. It has a first optical surface, a second optical surface, and a third optical surface. The first optical surface is located on the side of the light guide strip 3 closest to the cover plate body 1. The LED light source 2 is located on the side of the second optical surface of the light guide strip 3, and the third optical surface is a reflective surface. On one hand, the projected width of the light guide strip on the cover plate body is greater than its thickness in the normal direction of the cover plate body, reducing the gap between the cover plate body and the liquid crystal module. On the other hand, the light emitted from the LED light source enters the light guide strip through the first optical surface, a portion of the light enters the cover plate body directly through the second optical surface, and another portion is reflected by the third optical surface and then enters the cover plate body through the second optical surface, thereby improving the utilization rate of the LED light source. In actual design, refer to... Figure 6 The angle α between the third optical surface of the light guide strip and the horizontal plane is 0-60°.

[0033] Accordingly, to reduce the impact of the LED light source and light guide strip on the display effect of the display window, the light guide strip 3 is located on the side of the LED light source 2 away from the support structure 201. Positioning the light guide strip and light source at the edge of the display window near the support structure minimizes the impact on the display window without affecting the installation reliability of the cover plate.

[0034] In a further specific embodiment, the light guide strip 3 is fixedly connected to the cover plate body 1 by optical adhesive, and the LED light source 2 is fixed to the cover plate body 1 by optical adhesive. The optical adhesive eliminates assembly gaps between the light guide strip and the LED light source. Specifically, OCA optical adhesive 4 is used to minimize the impact on light transmission between the light guide strip and the cover plate body. In actual design, the LED light source can be fixed to the cover plate body by bonding the OCA optical adhesive to the FPC on it. In one processing method, an OCA optical adhesive layer can be locally coated on the cover plate body, and then the light guide strip and the LED light source can be sequentially adhered to the OCA optical adhesive layer.

[0035] In addition, in order to improve the light utilization rate of LED light sources, refer to Figure 5 The front light cover assembly of this embodiment also includes a reflective film 5, which covers the third optical surface of the light guide strip 3 and reflects the light refracted through the third optical surface back into the light guide strip.

[0036] In the specific design of the reflective module, the reflective film 5 includes a first reflective portion and a second reflective portion. The first reflective portion covers the third optical surface, and the second reflective portion extends from one end of the first reflective portion, covering part of the inner side of the cover plate body 1. The reflective film completely covers the area around the light guide strip where light leakage may occur, thus preventing light leakage.

[0037] 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 front light cover plate assembly for a reflective liquid crystal display device, characterized by include: Cover plate body (1), LED light source (2) and light guide strip (3); The cover plate body (1) has an outer side and an inner side. The LED light source (2) and the light guide strip (3) are both set on the inner side of the cover plate body (1) and the LED light source (2) is located on one side of the light guide strip (3). The light emitted from the LED light source (2) enters the cover plate body (1) through the light guide strip (3) and then exits from the inner side after being uniformly illuminated by the cover plate body (1). The light guide strip (3) has a wedge-shaped structure and has a first optical surface, a second optical surface and a third optical surface. The first optical surface is located on the side of the light guide strip (3) close to the cover plate body (1). The LED light source (2) is located on the side of the second optical surface of the light guide strip (3). The third optical surface is a reflective surface.

2. The front light cover plate assembly for a reflective liquid crystal display device according to claim 1, wherein The light guide strip (3) is fixedly connected to the cover plate body (1) by optical adhesive; And / or, the LED light source (2) is fixed to the cover plate body (1) by optical adhesive.

3. The front light cover plate assembly for a reflective liquid crystal display device according to claim 2, wherein The optical adhesive used is OCA optical adhesive (4).

4. The front light cover plate assembly for a reflective liquid crystal display device according to claim 1, wherein It also includes a reflective film (5), which covers the third optical surface of the light guide strip (3).

5. The front light cover plate assembly for a reflective liquid crystal display device according to claim 4, wherein The reflective film (5) includes a first reflective portion and a second reflective portion. The first reflective portion covers a third optical surface, and the second reflective portion extends from one end of the first reflective portion and covers part of the inner side of the cover plate body (1).

6. A reflective liquid crystal display device, characterized by comprising: Includes the front light cover assembly according to any one of claims 1-5.

7. The reflective liquid crystal display device according to claim 6, wherein It also includes a reflective liquid crystal module (300) and an outer frame (200). The outer frame (200) is provided with a display window, the reflective liquid crystal module (300) is located in the display window, the cover plate body (1) is installed on the outer frame (200) and covers the display window, and the LED light source (2) and the light guide strip (3) are located on the side of the cover plate body (1) close to the reflective liquid crystal module (300).

8. The reflective liquid crystal display device according to claim 7, wherein The outer frame (200) is provided with a support structure (201) located at the outer edge of the display window. The support structure (201) is provided with a cover plate fixing adhesive (202). The cover plate body (1) is fixed to the support structure (201) by the cover plate fixing adhesive (202).

9. The reflective liquid crystal display device according to claim 8, wherein The light guide strip (3) has a wedge-shaped structure and is located on the side of the LED light source (2) away from the support structure (201).

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