CN112817192A

CN112817192A - Special electronic paper front light structure

Info

Publication number: CN112817192A
Application number: CN202110205456.1A
Authority: CN
Inventors: 牛红丽; 陈鑫
Original assignee: Yashi Optoelectronics Group Co ltd
Current assignee: Yashi Optoelectronics Group Co ltd
Priority date: 2021-02-24
Filing date: 2021-02-24
Publication date: 2021-05-18
Anticipated expiration: 2041-02-24
Also published as: CN112817192B

Abstract

The invention provides an electronic paper front light structure, comprising a flexible optical light guide film, an electronic paper display module, a fixed iron frame, a toothed light guide plastic frame, an LED light bar and an aluminum foil reflective film. The front end of the flexible optical light guide film is pasted on the display surface of the electronic paper display module through OCA glue, and the outside of the back end is pasted with the aluminum foil reflective film. The back end of the flexible optical light guide film will also fix the iron frame and the toothed light guide. The plastic frame and LED light bar are wrapped inside, and fixed on the back of the electronic paper display module after wrapping. Compared with the light guide plate, the flexible optical light guide film has better luminous effect, more uniform and softer visual effect; The thin and light characteristics of the flexible optical light guide film can effectively reduce the surface thickness of the electronic paper display module. Compared with the thicker thickness of the light guide plate, the surface transmittance of the electronic paper display module can be effectively improved.

Description

Special electronic paper front light structure

Technical Field

The invention relates to the technical field of liquid crystal displays, in particular to a front light structure of electronic paper.

Background

In the prior art, the display principle of the electronic paper display module is an electrophoresis principle, and the electric field is changed to drive the charged particles, so as to generate a display picture. Because the electronic paper display module group does not have the light source, can not send light to the external world, can only rely on natural light or ambient light, just enable the user and watch the demonstration content, therefore the electronic paper display module group need install the front light device for the user also can normal use in dark surrounds or the environment that outside light is weak.

At present, the common front light device structure of the electronic paper display module is a light guide plate attached to the top of the electronic paper display module, an LED lamp bar is additionally arranged on the side edge of the light guide plate, and the light source is prevented from leaking outside in an attached shading belt at the contact position of the light guide plate and the LED lamp bar. However, the current light guide plate is generally made of acrylic or PC plate, the manufacturing method adopts nanoimprint, the size cannot be changed at will, and the mold opening is needed for electronic paper display modules with different sizes, which is expensive; because the electronic paper display module is light-proof, the LED lamp strip can only be arranged on the side edge of the light guide plate, so that the light is not uniform, and the light close to the LED lamp strip is brighter than the light far away from the LED lamp strip; the electronic paper display device self thickness is 1.0mm, and light guide plate thickness generally is 0.4mm, and the light guide plate needs to glue the laminating through OCA on the electronic paper display device, and whole thickness can reach 1.9mm, very big increase the surface thickness of electronic paper display module assembly, produced serious influence to the whole installation of product.

Disclosure of Invention

In order to solve the technical problems in the background art, the invention provides an electronic paper front light structure, which replaces the light guide plate commonly used nowadays by adopting a flexible optical light guide film, and realizes the purposes of reducing cost, simplifying process, reducing thickness and improving performance through special structural design so as to meet the requirements of more products and users.

In order to achieve the purpose, the invention adopts the following technical scheme:

an electronic paper front light structure comprises a flexible optical light guide film, an electronic paper display module, a fixed iron frame, a tooth-shaped light guide plastic frame, an LED light bar and an aluminum foil reflecting film.

The front end of flexible optics leaded light membrane passes through OCA and glues the display surface of laminating at electronic paper display module assembly, and the outside and the aluminium foil reflectance coating laminating of rear end, the rear end of flexible optics leaded light membrane still will fix chase, profile of tooth leaded light and mould frame and LED lamp strip parcel inside it, is fixed in electronic paper display module assembly back after the parcel.

Fixed chase be fixed in electronic paper display module assembly back, the frame is moulded to profile of tooth leaded light and LED lamp strip is all fixed on fixed chase, is equipped with the tooth on the frame is moulded to the profile of tooth leaded light, and the strip cutting is done to flexible optics leaded light membrane end, and the strip number equals with the number of the tooth that the frame is moulded to the profile of tooth leaded light for the winding of flexible optics leaded light membrane stiff end one-to-one is moulded on the tooth of frame is moulded to the profile of tooth leaded light.

The teeth of the tooth-shaped light guide plastic frame are triangular, are not on the same plane and are sequentially arranged in a step form.

The LED lamp strip comprises an LED lamp and an LED lamp strip FPC, the tooth-shaped light guide plastic frame wound with the flexible optical light guide film is fixed in the middle of the fixed iron frame, and the LED lamp strip is located between the tooth-shaped light guide plastic frame and the fixed iron frame and fixed through a clamping groove in the end portion of the fixed iron frame.

The LED lamp adopts a side-emitting LED, the light emitting surface of the LED faces to the teeth of the tooth-shaped light guide plastic frame, and then the light source directly irradiates the fixed end of the flexible optical light guide film.

Compared with the prior art, the invention has the beneficial effects that:

the invention solves the defects that the size and the shape cannot be changed at will by using the light guide plate and the mold opening cost is high by the electronic paper front light with a special structure, thereby effectively reducing the cost; compared with the light guide plate, the flexible optical light guide film has good and uniform light emitting effect and softer visual effect; because the frivolous characteristic of flexible optics leaded light membrane, can effectively reduce the surface thickness of electronic paper display module assembly, compare the thickness that the light guide plate is thick, the effectual surface transmissivity that promotes electronic paper display module assembly.

Drawings

FIG. 1 is a front view of an electronic paper display module with front light according to the present invention;

FIG. 2 is a side view of the structure of the electronic paper display module with front light according to the present invention;

FIG. 3 is a top view of the electronic paper display module with front light according to the present invention;

FIG. 4 is a front view of the profile of the tooth-shaped light guide plastic frame of the present invention;

FIG. 5 is a top plan view of FIG. 4;

FIG. 6 is a lower plan view of FIG. 4;

FIG. 7 is a side view of FIG. 4;

FIG. 8 is a schematic view of the flexible optical light directing film of the present invention;

FIG. 9 is a schematic view of the flexible optical light guide film and the tooth-shaped light guide plastic frame according to the present invention;

FIG. 10 is a schematic view of the illumination of a light source of the present invention;

FIG. 11 is a schematic view of an LED light bar of the present invention;

FIG. 12 is a view showing the outer shape of the fixing iron frame according to the present invention;

FIG. 13 is a schematic view of the front light unit assembly of the present invention;

wherein: 1-electronic paper display module 2-flexible optical light guide film 3-LED light bar FPC 4-aluminum foil reflective film 5-electronic paper display module FPC 6-LED lamp 7-fixed iron frame 8-tooth-shaped light guide plastic frame 9-tooth-shaped light guide plastic frame tooth 10-flexible optical light guide film fixed end 11-tooth-shaped light guide plastic frame buckle 12-fixed iron frame clamping groove 13-fixed iron frame buckle.

Detailed Description

The following detailed description of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1-13, an electronic paper front light structure includes a flexible optical light guiding film (2), an electronic paper display module (1), a fixed iron frame (7), a tooth-shaped light guiding plastic frame (8), an LED lamp (6), an LED lamp strip FPC (3), and an aluminum foil reflective film (4).

The front end of flexible optics leaded light membrane (2) passes through OCA and glues the display surface of laminating at electronic paper display module (1), and the outside and the laminating of aluminium foil reflectance coating (4) of rear end, the rear end of flexible optics leaded light membrane (2) still will fix chase (7), the profile of tooth leaded light is moulded frame (8) and LED lamp (6) parcel and is inside, is fixed in electronic paper display module (1) back after the parcel. Fixed chase (7) are fixed in electronic paper display module assembly (1) back, frame (8) and LED lamp (6) are all fixed on fixed chase (7) are moulded to profile of tooth leaded light, be equipped with tooth (9) on frame (8) are moulded to profile of tooth leaded light, the strip cutting is done to stiff end (10) at flexible optics leaded light membrane (2) end, the number of strip equals with the number of the tooth (9) that the frame was moulded to profile of tooth leaded light, make the winding of flexible optics leaded light membrane stiff end (10) one-to-one mould on tooth (9) that the frame was moulded to profile of tooth leaded light.

The Light Guide medium is a flexible optical Light Guide Film (2) (LGF for short), the flexible optical Light Guide Film (2) is a transparent Film with high refractive index and high transmittance, and the surface of the flexible optical Light Guide Film is provided with mesh point microstructures with different densities; the total reflection phenomenon is generated by utilizing the difference of the refractive indexes of the light among the media, and the light is guided to be emitted from the surface by the damage of the dot microstructure, so that the LED light source is a product for converting a point light source of an LED into a surface light source through a color light guide film. It has the advantages that: the ultrathin character is realized, and the thinnest thickness can reach 0.05 mm; uniform light emission and multiple color changes; the stability is good, the shape can be changed according to the requirements of customers, the die sinking is not needed, and the assembly is convenient; the cost of opening the mold is saved, the price is low, and the material is a light conduction material with low cost and low energy consumption. Adopt OCA to glue the mode of laminating, will satisfy the flexible optics leaded light membrane (2) laminating of customer's demand size at electronic paper display module assembly (1) display surface. The flexible optical light guide film (2) is removed from the surface part of the laminated electronic paper display module (1) and the fixed end (10) of the flexible optical light guide film, the middle section is externally leaked, the part needs to be laminated with the aluminum foil reflecting film (4), and the flexible optical light guide film (2) is convenient to absorb the light source better and is prevented from being externally leaked due to the shading effect, and the front section is convenient to wrap when being fixedly installed.

As shown in fig. 4-7, the flexible optical light guide film (2) is fixed by using a tooth-shaped light guide plastic frame (8), triangular teeth (9) are made on the tooth-shaped light guide plastic frame (8), and the teeth (9) cannot be on the same plane, and need to be arranged in sequence in a step form.

As shown in fig. 8-9, the flexible optical light guiding film fixing end (10) is cut into strips, the number of the strips is equal to the number of the teeth (9) of the tooth-shaped light guiding plastic frame, so that the flexible optical light guiding film fixing end (10) can be wound on the teeth (9) of the tooth-shaped light guiding plastic frame in a one-to-one correspondence manner, and the winding and fixing manner is as shown in fig. 6.

As shown in fig. 10, the step-shaped tooth distribution mode is used, so that the optical film on each tooth (9) can be uniformly and sufficiently irradiated by the LED lamp (6), and the light source is absorbed by the maximum capacity and is diffused to the surface of the electronic paper display module (1).

As shown in fig. 11, the LED lamp strip is composed of an LED lamp (6) and an LED lamp strip FPC (3), the LED lamp (6) is a side light emitting LED, so that the light emitting surface of the LED lamp (6) faces to the tooth (9) of the tooth-shaped light guide plastic frame, the light source can directly irradiate on the flexible optical light guide film fixing end (10), and the number and the brightness of the LED lamp (6) are selected according to the size and the required display brightness of the electronic paper display module (1). The LED lamp (6) is connected with the LED lamp strip FPC (3) in a welding mode.

As shown in fig. 12-13, the tooth-shaped light guide plastic frame (8), the LED lamp (6), and the FPC (3) for the LED light bar can be fixed and assembled by the fixing iron frame (7) to form a front light unit. The welded LED lamp strip is placed into a clamping groove (12) of a fixed iron frame to be fixed, then a tooth-shaped light guide plastic frame (8) wound with a flexible optical light guide film (2) is fixed in the fixed iron frame (7), a buckle (11) of the tooth-shaped light guide plastic frame and a buckle (13) of the fixed iron frame are correspondingly installed, and the LED lamp strip can be fixed between the tooth-shaped light guide plastic frame (8) and the fixed iron frame (7).

The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.

Claims

1. An electronic paper front light structure, characterized in that it comprises a flexible optical light guide film, an electronic paper display module, a fixed iron frame, a toothed light guide plastic frame, an LED light bar, and an aluminum foil reflective film;

The front end of the flexible optical light guide film is pasted on the display surface of the electronic paper display module through OCA glue, and the outside of the back end is pasted with the aluminum foil reflective film. The back end of the flexible optical light guide film will also fix the iron frame and the toothed light guide. The plastic frame and LED light bar are wrapped inside, and fixed on the back of the electronic paper display module after wrapping.

2. An electronic paper front light structure according to claim 1, wherein the fixed iron frame is fixed on the back of the electronic paper display module, and the toothed light guide plastic frame and the LED light bar are fixed on the fixed iron frame. On the iron frame, the tooth-shaped light guide plastic frame is provided with teeth, and the end of the flexible optical light guide film is cut in strips. The number of strips is equal to the number of teeth of the tooth-shaped light guide plastic frame, making the flexible optical guide The fixed ends of the light film are correspondingly wound on the teeth of the tooth-shaped light guide plastic frame.

3 . The electronic paper front light structure according to claim 2 , wherein the teeth of the tooth-shaped light-guiding plastic frame are in a triangular shape, and the teeth are not on the same plane, and are sequentially arranged in a stepped form. 4 . .

4 . The electronic paper front light structure according to claim 2 , wherein the LED light bar is composed of LED light and LED light bar FPC, and a tooth-shaped light guide plastic wrapped around a flexible optical light guide film. 5 . The frame is fixed in the middle of the fixed iron frame, and the LED light bar is located between the toothed light guide plastic frame and the fixed iron frame, and is fixed by the card slot at the end of the fixed iron frame.

5 . The electronic paper front light structure according to claim 2 , wherein the side-emitting LED is selected for the LED lamp, and the light-emitting surface of the LED faces the teeth of the tooth-shaped light guide plastic frame, and the light source directly illuminates the light source. 6 . On the fixed end of the flexible optical light guide film.