JP3241183U - Improved electronic paper display lighting structure - Google Patents

Abstract

An improved electronic paper display lighting structure is provided.
An improved electronic paper display lighting structure including a surface cover (30), a lighting module (20), and an electronic paper display module (10) includes a non-light-transmitting or low light-transmitting material in the peripheral region of its bottom surface. It has a black frame 31 formed by An illumination module having a light guide plate 21 and a plurality of point light sources 22 provided on the outer end surface of the light guide plate is adhered to the bottom surface of the surface cover with an optical adhesive 40 . A light reflecting element LR is provided in the overlapping region between the light guide plate and the black frame portion of the front cover, and the electronic paper display module is attached to the bottom surface of the lighting module using an optical adhesive. A light reflection element is used to form a total reflection effect in the overlapping area between a light guide plate and a black frame portion of a surface cover, thereby eliminating the defect that a ghost phenomenon occurs on a display screen in the vicinity of the black frame portion.
[Selection drawing] Fig. 3

Description

TECHNICAL FIELD The present invention relates to the technical field of electronic paper displays, and more particularly to the structural improvement of lighting modules of electronic paper displays.

Electronic paper display (E-Paper Display) has advantages such as analog paper characteristics such as flexibility, wide viewing angle, light weight, high resolution, high contrast, indoor and outdoor readability and low power consumption, so it is widely used in electronic devices. Widely used in combination with The electronic paper display itself does not emit light, and normally uses ambient light as the display illumination source. Current electronic paper displays often install a separate lighting module to provide supplemental lighting to ensure display quality. As shown in FIGS. 1 and 2, the current lighting module 20 has one or more point light sources 22 on the side edges of the light guide plate 21, and the light guide plate 21 converts the point light sources 22 into surface light sources. Illumination light uniformly projected onto the display screen of the electronic paper display 10 is supplied. The illumination module 20 is arranged between the laminations of the surface cover 30 and the electronic paper display 10 , and the laminations are adhered and integrated using an optical adhesive 40 .
Of these, a black frame 31 that does not transmit light is provided in the peripheral area of the bottom surface of the surface cover 30 as a decorative frame that covers the edge wiring structure. The point-like light source 22 of the illumination module is positioned just below the black frame 31 , and the light guide plate 21 and the black frame 31 are adhered to each other with an optical adhesive 40 . However, the refractive index range of the optical adhesive 40 is about 1.47 to 1.51, and the refractive index of the light guide plate 21 (acrylic plate) is about 1.491. Since the index is very close, the rays of the point light source 22 incident from the side surface of the light guide plate 21 are partially refracted by the lamination of the optical adhesive 40 and affected by the black frame 31, resulting in refraction and reflection of the light. become uneven. Therefore, the ghost phenomenon occurs in the display near the black frame 31, creating a darker or brighter light shading SD, which not only affects the aesthetic appearance, but also impairs the visibility of the display and needs to be improved.

In view of the shortcomings of the lighting structure of the traditional electronic paper display, the main purpose of the present invention is to eliminate the ghost phenomenon in the display near the black border, so that the lighting of the electronic paper display can have a uniform and bright effect. To provide an improved structure of a lighting module for a paper display.
To achieve the above objectives, the improved electronic paper display lighting structure of the present invention includes a surface cover, a lighting module, and an electronic paper display module.
The top cover is provided with a black frame made of a light-impermeable or low-light-transmittance material in the peripheral area of the bottom surface.
The illumination module has a light guide plate and a plurality of point light sources, the point light sources are provided on the outer end surface portion of the light guide plate, the illumination module is arranged on the bottom surface of the surface cover, and is attached using an optical adhesive. A light reflector is attached to the surface cover and provided in an overlapping region between the light guide plate and the black frame portion of the surface cover.
The electronic paper display module is provided on the bottom surface of the illumination module and is attached to the bottom surface of the light guide plate of the illumination module using an optical adhesive. By arranging the light reflecting element, a total reflection effect is formed in the range of the overlapping area between the light guide plate and the black frame portion of the front cover, and the occurrence of the ghost phenomenon on the display screen in the vicinity of the black frame is eliminated.
According to the present invention, the light reflecting element is an optical thinning medium layer whose refractive index is smaller than that of the light guide plate, and the refractive index of the optical thinning medium layer is lower than that of the light guide plate. small.
Preferably, the refractive index of the photophobic dielectric layer is less than 1.4, preferably the photophobic dielectric layer is an air layer or a vacuum layer.
According to the present invention, the opto-dielectric layer is disposed within the area of the black frame, and the distance between the inner edge of the opto-dielectric layer and the inner edge of the black frame is about 0.5 mm to 2 mm.
According to the invention, the light reflecting element is a mirror or a white reflecting surface.
Other functional and technical features of the present invention will be further clarified below, and those skilled in the art will be able to realize the present invention after carefully reading the description of this specification.

The present invention can eliminate the ghost phenomenon on the display near the black border, and make the lighting of the electronic paper display a uniform and bright effect.

1 is a schematic plan view of a conventional electronic paper display; FIG. 2 is a schematic side cross-sectional view of the laminated composite structure along section line II-II of FIG. 1; FIG. 1 is a schematic side cross-sectional view of a laminated composite structure according to a first embodiment of the present invention; FIG. FIG. 5 is a schematic side cross-sectional view of a laminated composite structure according to a second embodiment of the present invention;

3 and 4 respectively describe the first embodiment and the second embodiment of the lighting structure of the electronic paper display of the present invention, including the electronic paper display module 10, the lighting module 20 and the surface cover 30. FIG. The electronic paper display module 10 is a reflective display with low power consumption and flexibility, and uses electrophoretic technology and cholesteric liquid crystal technology to display video signals on the display screen of the electronic paper display module 10 as a video screen. do.

The illumination module 20 includes a light guide plate 21, and a plurality of point light sources 22 (for example, LEDs or Micro LEDs) are provided on one side end surface of the light guide plate 21. As shown in FIG.
Among them, the point light source 22 projects light from one side end surface of the light guide plate 21 and converts the projected light into an area light emitting downward. The area of the light guide plate 21 matches the visible area of the electronic paper display module 10 and provides good illumination to the visible area of the electronic paper display module 10 . The material of the light guide plate 21 is selected from polycarbonate (PC), polymethylmethacrylate (PMMA), and polyester (PET) materials, but the types used are not limited to the above materials. In order for the light guide plate 21 to serve as a surface light source that uniformly distributes the luminance of light rays, a plurality of astigmatism points (not shown in the drawing) are provided on the plate body of the light guide plate 21 so that the light from the point light source 22 is Incident light can be converted into light rays uniformly distributed on the plate. Moreover, astigmatism points can be formed by using a material having a higher refractive index than the base material of the light guide plate 21, or by providing concave holes or protruding bumps in the plate body of the light guide plate 21, and The sparse and dense distribution of viewpoints may be used to produce the uniform distribution effect of the light intensity on the light guide plate 21 .

The surface cover 30 is a thin plate having excellent mechanical strength and high light transmittance, and its material is various glasses, polymethyl methacrylate (PMMA), polycarbonate (PC), polyester (PET), cycloolefin copolymer. (COC) or cycloolefin polymer (COP), etc., but the scope of implementation is not limited to the aforementioned materials. In addition, a black frame 31 made of a non-light-transmitting or low-light-transmitting film layer made of a non-conductive material is provided in the peripheral area of the bottom surface of the surface cover 30. The non-conductive material is ink or photo film. Materials such as photoresist can be used, and the range of materials that can be implemented is not limited thereto. The non-conductive material can form a thin film layer with a thickness of 15 μm or more on the periphery of the bottom surface of the surface cover 30 by technical means such as printing, sputtering, coating, and the like. The black frame 31 of the front cover shields the point light source 22 located at the lower edge of the lighting module 20 and the peripheral wiring area of the electronic paper display module 10, thereby improving the appearance of the entire device.

The electronic paper display module 10, the lighting module 20 and the surface cover 30 are sequentially laminated, and the optical adhesive 40, such as OCA Optical Clear Adhesive, OCR Optical Clear Resin, or SCA optical adhesive (Solid Optically Clear Adhesive), etc., to bond each laminate together. A light reflecting element LR is provided in the overlapping region between the light guide plate 21 and the black frame 31 of the front cover. It is a light-phobic dielectric layer 41 having a small refractive index. For example, the light guide plate 21 is made of PMMA material with a refractive index of 1.491. is preferably an air layer or a vacuum layer where is close to unity. Since the light sparse dielectric layer 41 forms a total reflection effect in the range of the overlapping area between the light guide plate 21 and the black frame 31 of the front cover, light rays incident from the side surface of the light guide plate 21 are not affected by the black frame 31. , the problem that a ghost phenomenon occurs on the display screen in the vicinity of the black frame portion can be improved. Experiments have shown that the effect of eliminating the ghost phenomenon is good by keeping the distance between the inner edge 41a of the light-sparing dielectric layer 41 and the inner edge 31a of the black frame at about 0.5 mm to 2 mm. It was shown that there is

In addition, in the second embodiment described with reference to FIG. 4, the light reflecting element LR may be the mirror 51 (or the white reflecting surface) provided on the bottom surface of the black frame 31 . By providing a highly efficient light reflection interface in the overlapping region between the light guide plate 21 and the black frame 31 of the front cover, the light incident from the side surface of the light guide plate 21 is not affected by the black frame 31. The problem of ghost phenomenon occurring on the display screen can be eliminated.

Although the present invention fully describes specific embodiments with reference to the drawings, said embodiments are only for the purpose of facilitating the description of the examples, and the embodiments of the present invention are limited to this description. not a thing Since the present invention can actually achieve the desired function and purpose, and can be implemented by a person skilled in the art based on the above detailed description, from the above examples, equivalent structural changes are still without departing from the scope of rights of the present invention. That is, any changes or modifications made in the same creative spirit related to the present invention shall fall within the protection scope of the present invention.

10 electronic paper display module 20 illumination module 21 light guide plate 22 point light source 30 surface cover 31 black frame 31a inner edge of black frame 40 optical adhesive;
41 light-sparing dielectric layer 41a inner edge of light-sparing dielectric layer 51 mirror LR light reflecting element SD light shading

Claims (7)

An improved electronic paper display lighting structure includes a surface cover, a lighting module, an electronic paper display module,
The surface cover is provided with a black frame made of a light-impermeable or low-light-transmittance material in the peripheral region of the bottom surface,
The illumination module has a light guide plate and a plurality of point light sources, the point light sources are provided on the outer end face portion of the light guide plate, the illumination module is arranged on the bottom surface of the surface cover, and the optical a light reflecting element is provided in an overlapping region between the light guide plate and the black frame portion of the surface cover, and is attached to the surface cover using an adhesive;
The improved electronic paper display lighting structure is characterized in that the electronic paper display module is provided on the bottom surface of the lighting module and bonded to the bottom surface of the light guide plate of the lighting module using an optical adhesive. 2. The improved electronic paper according to claim 1, wherein the light reflecting element is a light-sparing dielectric layer, and the refractive index of the light-sparing dielectric layer is lower than the refractive index of the light guide plate. display lighting structure. 3. The improved electronic paper display lighting structure as claimed in claim 2, wherein the refractive index of said light-phobic dielectric layer is less than 1.4. The improved electronic paper display lighting structure of claim 2, wherein the light-phobic dielectric layer is an air layer or a vacuum layer. The light-rejective dielectric layer is disposed within the black frame area, and the distance between the inner edge of the light-rejective dielectric layer and the inner edge of the black frame is about 0.5 mm to 2 mm. The improved electronic paper display lighting structure according to claim 2. The improved electronic paper display lighting structure as claimed in claim 1, wherein said light reflecting element is a mirror. The improved electronic paper display lighting structure as claimed in claim 1, wherein said light reflective element is a white reflective surface.

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