A special electronic paper front light structure

Abstract

The present invention provides an electronic paper front light structure, comprising a flexible optical light-guiding film, an electronic paper display module, a fixed iron frame, a toothed light-guiding plastic frame, an LED light bar, and an aluminum foil reflective film. The front end of the flexible optical light-guiding film is bonded to the display surface of the electronic paper display module by OCA glue, and the outside of the rear end is bonded to the aluminum foil reflective film. The rear end of the flexible optical light-guiding film also wraps the fixed iron frame, the toothed light-guiding plastic frame, and the LED light bar inside, and is fixed to the back of the electronic paper display module after wrapping. The disadvantages of using a light guide plate that the size and shape cannot be changed at will and the high mold opening cost are solved, and the cost is effectively reduced; the flexible optical light-guiding film has a better luminous effect than the light guide plate, is more uniform, and has a softer visual effect; due to the thin and light characteristics of the flexible optical light-guiding film, the surface thickness of the electronic paper display module can be effectively reduced, and compared with the thick thickness of the light guide plate, the surface transmittance of the electronic paper display module is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal displays, and in particular to an electronic paper front light structure. Background Art

[0002] In current technology, the display principle of electronic paper display modules is the electrophoresis principle, which drives charged particles by changing the electric field to produce a display image. Since electronic paper display modules do not have their own light source and do not emit light to the outside world, users can only rely on natural light or ambient light to view the displayed content. Therefore, electronic paper display modules need to be equipped with a front light device so that users can use them normally in dark environments or environments with weak external light.

[0003] At present, the common front light device structure of the electronic paper display module is to attach a light guide plate above the electronic paper display module, add an LED light bar to the side of the light guide plate, and attach a light shielding tape at the contact point between the light guide plate and the LED light bar to prevent the light source from leaking out. However, the material of the light guide plate is generally acrylic or PC sheet, and the manufacturing method adopts nano-imprinting. The size cannot be changed at will. For electronic paper display modules of different sizes, molds need to be opened, and the mold opening cost is expensive; because the electronic paper display module is not light-transmitting, the LED light bar can only be installed on the side of the light guide plate, which will cause uneven light emission, and the light closer to the LED light bar will be brighter than the light farther away from the LED light bar; the thickness of the electronic paper display device itself is 1.0mm, and the thickness of the light guide plate is generally 0.4mm. The light guide plate needs to be attached to the electronic paper display device through OCA glue, and the overall thickness will reach 1.9mm, which greatly increases the surface thickness of the electronic paper display module and has a serious impact on the overall installation of the product. Summary of the invention

[0004] In order to solve the technical problems raised by the background technology, the present invention provides an electronic paper front light structure, which adopts a flexible optical light-guiding film to replace the light-guiding plate commonly used today, and through a special structural design, it can reduce costs, simplify processes, reduce thickness, and improve performance to meet the needs of more products and users.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An electronic paper front light structure comprises a flexible optical light-guiding film, an electronic paper display module, a fixed iron frame, a toothed light-guiding plastic frame, an LED light bar and an aluminum foil reflective film.

[0007] The front end of the flexible optical light-guiding film is adhered to the display surface of the electronic paper display module through OCA glue, and the outside of the rear end is adhered to the aluminum foil reflective film. The rear end of the flexible optical light-guiding film also wraps the fixed iron frame, toothed light-guiding plastic frame and LED light strip inside it, and then fixes it on the back of the electronic paper display module.

[0008] The fixed iron frame is fixed to the back of the electronic paper display module, the toothed light-guiding plastic frame and the LED light strip are both fixed on the fixed iron frame, the toothed light-guiding plastic frame is provided with teeth, the end of the flexible optical light-guiding film is cut into strips, the number of strips is equal to the number of teeth of the toothed light-guiding plastic frame, so that the fixed ends of the flexible optical light-guiding film are wound around the teeth of the toothed light-guiding plastic frame one by one.

[0009] The teeth of the toothed light-guiding plastic frame are triangular in shape, the teeth are not on the same plane, and are arranged in sequence in a stepped form.

[0010] The LED light strip is composed of an LED lamp and an LED light strip FPC. A toothed light guide plastic frame wrapped with a flexible optical light guide film is fixed in the middle of a fixed iron frame. The LED light strip is located between the toothed light guide plastic frame and the fixed iron frame and is fixed by a slot at the end of the fixed iron frame.

[0011] The LED lamp is a side-emitting LED, and the light-emitting surface of the LED faces the teeth of the toothed light-guiding plastic frame, so that the light source directly irradiates the fixed end of the flexible optical light-guiding film.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The present invention solves the drawbacks of the inability to arbitrarily change the size and shape of the light guide plate and the high mold opening cost through a special structure of the electronic paper front light, thereby effectively reducing the cost; the flexible optical light guide film has a better and more uniform luminous effect than the light guide plate, and the visual effect is softer; due to the thin and light characteristics of the flexible optical light guide film, the surface thickness of the electronic paper display module can be effectively reduced, and compared with the thicker thickness of the light guide plate, the surface transmittance of the electronic paper display module is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the structure of the electronic paper display module with front light of the present invention;

[0015] Figure 2 It is a side view of the structure of the electronic paper display module with front light of the present invention;

[0016] Figure 3 A top view of the electronic paper display module structure with front light of the present invention;

[0017] Figure 4 This is a front view of the toothed light guide plastic frame of the present invention;

[0018] Figure 5 for Figure 4 An upper plan view of

[0019] Figure 6 for Figure 4 A bottom plan view of

[0020] Figure 7 for Figure 4 Side view of

[0021] Figure 8 It is a schematic diagram of the appearance of the flexible optical light-guiding film of the present invention;

[0022] Fig. 9 It is a schematic diagram of fixing the flexible optical light-guiding film and the toothed light-guiding plastic frame of the present invention;

[0023] Fig.10 It is a schematic diagram of light source illumination of the present invention;

[0024] Fig.11 This is the appearance diagram of the LED light bar of the present invention;

[0025] Fig.12 It is the appearance diagram of the fixed iron frame of the present invention;

[0026] Fig.13 It is a schematic diagram of assembling the front light unit of the present invention;

[0027] Wherein: 1-electronic paper display module 2-flexible optical light guide film 3-LED light strip FPC 4-aluminum foil reflective film 5-electronic paper display module FPC 6-LED lamp 7-fixed iron frame 8-toothed light guide plastic frame 9-teeth of the toothed light guide plastic frame 10-fixed end of the flexible optical light guide film 11-buckle of the toothed light guide plastic frame 12-slot of the fixed iron frame 13-buckle of the fixed iron frame. DETAILED DESCRIPTION

[0028] The specific implementation modes provided by the present invention are described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-13 As shown, an electronic paper front light structure comprises a flexible optical light-guiding film (2), an electronic paper display module (1), a fixed iron frame (7), a toothed light-guiding plastic frame (8), an LED lamp (6), an LED light strip FPC (3), and an aluminum foil reflective film (4).

[0030] The front end of the flexible optical light-guiding film (2) is bonded to the display surface of the electronic paper display module (1) by means of OCA glue, and the outside of the rear end is bonded to the aluminum foil reflective film (4). The rear end of the flexible optical light-guiding film (2) also wraps the fixed iron frame (7), the toothed light-guiding plastic frame (8) and the LED lamp (6) inside, and is fixed to the back of the electronic paper display module (1) after wrapping. The fixed iron frame (7) is fixed to the back of the electronic paper display module (1), the toothed light-guiding plastic frame (8) and the LED lamp (6) are both fixed to the fixed iron frame (7), and the toothed light-guiding plastic frame (8) is provided with teeth (9). The fixed end (10) at the end of the flexible optical light-guiding film (2) is cut into strips, and the number of strips is equal to the number of teeth (9) of the toothed light-guiding plastic frame, so that the fixed end (10) of the flexible optical light-guiding film is wound on the teeth (9) of the toothed light-guiding plastic frame in a one-to-one correspondence.

[0031] The light-guiding medium is a flexible optical light-guiding film (2) (Light Guide Film, LGF for short). The flexible optical light-guiding film (2) is a transparent film with high refractive index and high transmittance, and has a dot microstructure of different densities on the surface. It uses the difference in the refractive index of light between the media to cause total reflection, and guides the light to be emitted from the surface by destroying the dot microstructure. It is a product that converts the point light source of LED into a surface light source through a colored light-guiding film. Its advantages are: it has the characteristics of ultra-thinness, with the thinnest thickness reaching 0.05mm; it emits light evenly and has a variety of colors; it has good stability, and its shape can be changed according to customer needs, and it does not require mold opening, which is convenient for assembly; it saves mold opening costs, has a low price, and is a low-cost and low-energy light-transmitting material. The flexible optical light-guiding film (2) of a size that meets customer needs is bonded to the display surface of the electronic paper display module (1) by OCA adhesive bonding. The flexible optical light-conducting film (2), except for the portion that is bonded to the surface of the electronic paper display module (1) and the portion of the fixed end (10) of the flexible optical light-conducting film (2), the exposed portion in the middle section needs to be bonded to the aluminum foil reflective film (4) to facilitate wrapping when the front light unit is installed and fixed, so as to ensure that the flexible optical light-conducting film (2) absorbs the light source better and at the same time plays a role in shading to prevent light from leaking out.

[0032] like Figure 4-7 As shown, a toothed light-guiding plastic frame (8) is used to fix the flexible optical light-guiding film (2), and triangular teeth (9) are made on the toothed light-guiding plastic frame (8). The teeth (9) cannot be on the same plane, but need to be arranged in a stepped manner.

[0033] like Figure 8-9 As shown, the flexible optical light-guiding film fixed end (10) is cut into strips, and the number of strips is equal to the number of teeth (9) of the toothed light-guiding plastic frame, so that the flexible optical light-guiding film fixed end (10) can be wound on the teeth (9) of the toothed light-guiding plastic frame one by one. The winding and fixing method is as follows: Figure 6shown.

[0034] like Fig.10 As shown, the use of a stepped tooth distribution method can ensure that the optical film on each tooth (9) can be evenly and fully illuminated by the LED light (6), so that the light source is absorbed to the maximum extent and diffused to the surface of the electronic paper display module (1).

[0035] like Fig.11 As shown, the LED light bar is composed of an LED lamp (6) and an LED light bar FPC (3). The LED lamp (6) is a side-emitting LED, so that the light-emitting surface of the LED lamp (6) faces the teeth (9) of the toothed light-guiding plastic frame, and the light source can directly illuminate the fixed end (10) of the flexible optical light-guiding film. The number and brightness of the LED lamp (6) are selected according to the size of the electronic paper display module (1) and the required display brightness. The LED lamp (6) is connected to the LED light bar FPC (3) by welding.

[0036] like Figure 12-13 As shown, the fixed iron frame (7) can fix and assemble the toothed light guide plastic frame (8), the LED lamp (6), and the LED light bar FPC (3) to form a front light unit. The welded LED light bar is placed in the card slot (12) of the fixed iron frame for fixing, and then the toothed light guide plastic frame (8) wrapped with the flexible optical light guide film (2) is fixed in the fixed iron frame (7), and the buckle (11) of the toothed light guide plastic frame is installed correspondingly with the buckle (13) of the fixed iron frame, so that the LED light bar can be fixed between the toothed light guide plastic frame (8) and the fixed iron frame (7).

[0037] The above embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. An electronic paper front light structure, characterized in that: Including flexible optical light-guiding film, electronic paper display module, fixed iron frame, toothed light-guiding plastic frame, LED light bar, and aluminum foil reflective film; The front end of the flexible optical light guide film is attached to the display surface of the electronic paper display module through OCA glue, and the outside of the rear end is attached to the aluminum foil reflective film. The rear end of the flexible optical light guide film also wraps the fixed iron frame, the toothed light guide plastic frame and the LED light strip inside it, and then fixes it to the back of the electronic paper display module. The fixed iron frame is fixed to the back of the electronic paper display module, the toothed light guide plastic frame and the LED light strip are fixed to the fixed iron frame, the toothed light guide plastic frame is provided with teeth, the end of the flexible optical light guide film is cut into strips, the number of strips is equal to the number of teeth of the toothed light guide plastic frame, so that the fixed ends of the flexible optical light guide film are wound around the teeth of the toothed light guide plastic frame in a one-to-one correspondence; The teeth are triangular in shape, the teeth are not on the same plane, and are arranged in a stepped manner; The LED light strip is composed of an LED lamp and an LED light strip FPC. A toothed light guide plastic frame wrapped with a flexible optical light guide film is fixed in the middle of a fixed iron frame. The LED light strip is located between the toothed light guide plastic frame and the fixed iron frame and is fixed by a slot at the end of the fixed iron frame.

2. The electronic paper front light structure according to claim 1, characterized in that: The LED lamp is a side-emitting LED, and the light-emitting surface of the LED faces the teeth of the toothed light-guiding plastic frame, so that the light source directly irradiates the fixed end of the flexible optical light-guiding film.

Images