CN220085211U - Touch electronic paper device with front lighting structure - Google Patents
Touch electronic paper device with front lighting structure Download PDFInfo
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- CN220085211U CN220085211U CN202321081805.4U CN202321081805U CN220085211U CN 220085211 U CN220085211 U CN 220085211U CN 202321081805 U CN202321081805 U CN 202321081805U CN 220085211 U CN220085211 U CN 220085211U
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- electronic paper
- touch
- guide plate
- light guide
- front lighting
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Abstract
The touch electronic paper device with the front lighting structure comprises a touch cover plate module, wherein the touch cover plate module is formed by overlapping a top plate, a touch sensor and a bottom plate into a whole, a black frame is arranged in the peripheral edge area of the bottom surface of the top plate, and a low-refractive-index transparent conductive film is arranged on the bottom surface of the bottom plate; the front lighting module is provided with a light guide plate, at least one outer side end edge part of the light guide plate is provided with a point light source, and the point light source projects light rays from the side end surface of the light guide plate to be converted into a surface light source emitted to the bottom surface of the light guide plate; an electronic paper display module; the touch cover plate module, the front lighting module and the electronic paper display module are sequentially overlapped to form a whole, so that the upper surface of the light guide plate is attached to the bottom surface of the low-refractive-index transparent conductive film, a total reflection interface is formed on the upper surface of the light guide plate, and an electromagnetic shielding layer is formed between the touch sensor and the electronic paper display module. Therefore, the ghost phenomenon generated near the black frame can be eliminated, the illumination of the electronic paper display screen can be increased, and electromagnetic interference signals can be blocked.
Description
Technical Field
The present utility model relates to electronic paper, and more particularly, to a touch electronic paper device with a front lighting structure.
Background
Electronic paper is widely used in combination with various electronic devices; the electronic paper has the characteristics of simulated paper such as flexibility, wide visual angle, light weight, high resolution, high contrast, indoor and outdoor readability and the like, and has the advantages of low power consumption and the like, but the electronic paper does not emit light, and is used as a source of illumination light of a display screen, and the display quality is seriously affected in the occasion of insufficient ambient light such as indoor space and the like, so that the electronic paper display equipment is mostly provided with a front illumination module to provide auxiliary illumination light so as to ensure the display quality of the electronic paper; the front lighting module is installed in front of the electronic paper display screen so as to provide auxiliary lighting for the electronic paper display screen.
In a conventional front lighting module structure, one or more point light sources are disposed on a side end surface of a light guide plate, and the light guide plate can convert the point light sources into a surface light source, so that light is uniformly projected onto a display screen of an electronic paper display module to provide illumination. The front lighting module is arranged between the surface cover plate and the lamination layers of the electronic paper display module, and the lamination layers are bonded into a whole by using optical adhesive; wherein, a black frame which is not light-transmitting is arranged at the peripheral edge area of the bottom surface of the surface cover plate and is used as a decorative frame for covering the edge circuit structure, and the punctiform light source of the front lighting module is just below the black frame; however, when the configuration mode is actually used, the illumination light of the front illumination module often generates a ghost phenomenon of uneven brightness on the display screen near the black frame part, and the prospective of the electronic paper display screen is affected; researches show that the refractive indexes of the surface cover plate, the bonded optical adhesive and the light guide plate material are similar, and the total reflection effect of the surface of the light guide plate is destroyed after the surface cover plate and the bonded optical adhesive are bonded together, so that part of light rays of the point-shaped light source incident from the side surface of the light guide plate are refracted to the optical adhesive and the surface cover plate, the refracted light rays are influenced by the black frame, and the ghost phenomenon of uneven light and shade lines is formed on the display screen near the black frame part, thereby seriously affecting the attractiveness and reducing the prospective of the electronic paper display screen.
In addition, a plurality of application schemes are provided at present, wherein a touch sensor is arranged in front of the electronic paper display screen and used as an input device, so that a user can interactively operate with an image picture of the electronic paper display screen through the touch sensor, and the convenience of using the electronic paper is further improved; however, when the touch sensor is used, electromagnetic interference (EMI) and Radio Frequency Interference (RFI) from the outside are easily suffered, so when the electronic paper display screen is in a changing display operation, for example, turning pages or removing pictures, the electronic paper can generate interference signals, which often causes false alarm of the touch sensor, thus forming a using trouble.
Disclosure of Invention
In view of this, the present utility model provides an improved touch electronic paper device with a front lighting structure, in which a low refractive index transparent conductive film is disposed above a light guide plate of a front lighting module so as to form a total reflection interface on the upper surface of the light guide plate, thereby eliminating the defect of generating ghosting phenomenon near a black frame portion, increasing the illuminance to an electronic paper display screen, and the low refractive index transparent conductive film can form an electromagnetic shielding layer between a touch sensor and the electronic paper display screen to block electromagnetic interference signals and avoid affecting the normal operation of the touch sensor.
In order to achieve the above-mentioned purpose, the touch electronic paper device with a front lighting structure provided by the utility model comprises a touch cover plate module, which is formed by overlapping a top plate, a touch sensor and a bottom plate into a whole, wherein a black frame is arranged in the peripheral edge area of the bottom surface of the top plate, and a layer of low-refractive-index transparent conductive film is arranged on the bottom surface of the bottom plate; the front lighting module is provided with a light guide plate, at least one point light source is arranged at the outer side edge part of the light guide plate, and the point light source projects light from the side end surface of the light guide plate so as to convert the projected light into a surface light source which is emitted to the bottom surface of the light guide plate; an electronic paper display module; the touch cover plate module, the front lighting module and the electronic paper display module are sequentially overlapped to form a whole, so that the upper surface of the light guide plate is attached to the bottom surface of the low-refractive-index transparent conductive film, a total reflection interface is formed on the upper surface of the light guide plate, and an electromagnetic shielding layer is formed between the touch sensor and the electronic paper display module.
According to the present utility model, wherein the refractive index of the low refractive index transparent conductive film is smaller than that of the light guide plate; preferably, the refractive index of the low refractive index transparent conductive film is 1.0 or less; more preferably, the refractive index of the low refractive index transparent conductive film is 0.7 or less.
According to the utility model, the low refractive index transparent conductive film is a metal film, and the thickness of the metal film is below 70 nm; in one embodiment, the low refractive index transparent conductive film is a molybdenum-containing metal film.
According to the utility model, the black frame is an opaque or low light transmittance film made of a non-conductive material.
According to the utility model, a light shielding frame is arranged at the peripheral edge area of the bottom surface of the bottom plate, the light shielding frame is a thin film layer formed by materials with light-tight or low light transmittance, and the width of the light shielding frame is smaller than or equal to that of the black frame.
According to the utility model, the touch sensor is selected from a capacitive touch sensor, a resistive touch sensor, an electromagnetic touch sensor, a sonic touch sensor, a vibration touch sensor, an optical touch sensor or a combination of more than one of the above touch sensors.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following.
Drawings
Fig. 1 is a schematic plan view of the present utility model.
FIG. 2 is a schematic side sectional view of the laminated composite structure of FIG. 1 along section line II-II.
Symbol description in the drawings:
10, a touch cover plate module;
a top plate 11;
11a black frame;
a 12 touch sensor;
13a bottom plate;
13a low refractive index transparent conductive film;
13b a light shielding frame;
a front lighting module 30;
31 a light guide plate;
32 point light sources;
50 an electronic paper display module.
Detailed Description
The technical features of the present utility model will be further explained in the following embodiments, wherein the structures, proportions, sizes and the like shown in the drawings attached hereto are used solely for the purposes of illustration and description and are not intended to limit the applicable scope of the present utility model, and any structural modifications, proportional changes or dimensional adjustments should not be construed as limitations on the scope of the utility model, without affecting the efficacy or achievement of the present utility model. Also, the terms cited in the present specification are only for convenience of description and are not intended to limit the scope of the present utility model, and the changes or modifications of the relative relationship are considered to be within the scope of the present utility model without substantial modification of the technical content.
Fig. 1 and 2 show a preferred embodiment of a touch electronic paper device with a front lighting structure according to the present utility model, which sequentially includes a touch cover module 10, a front lighting module 30, and an electronic paper display module 50.
The touch cover module 10 is composed of a top plate 11, a touch sensor 12 and a bottom plate 13; the top plate 11 is a high light transmittance sheet with excellent mechanical strength, and is selected from various glass, polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polycarbonate (PC), cyclic olefin copolymer (COC/COP), etc., but the implementation range is not limited to the above materials; the top surface of the top plate 11 may be a hardened surface and/or an optically functional surface, such as an anti-glare surface (AG) or an anti-reflection surface (AR); a black frame 11a is disposed at the peripheral edge region of the bottom surface of the top plate 11, and the black frame 11a is an opaque or low-transmittance film made of a non-conductive material, wherein the non-conductive material may be ink or photoresist (photoresist st), but the range of applicable materials is not limited thereto; the non-conductive material may be formed into a thin film layer having a thickness of 15 μm or more on the peripheral portion of the bottom surface of the top plate 11 by printing, sputtering, coating, or the like.
In fig. 1, the touch sensor 12 is shown as a capacitive touch sensor, which is composed of an X-axis sensing layer and a Y-axis sensing layer, so that the two sensing layers are insulated, and the X-axis sensing layer and the Y-axis sensing layer are respectively grounded and connected to a control circuit (not shown in the drawing); generally, the touch action area of the touch sensor 12 has an area range corresponding to the visual area of the electronic paper display module 50, so that the touch action area can be matched with the image displayed by the electronic paper display module 50 as a touch input device, so that a user can perform interactive operation with the image provided by the electronic paper display module 50 through the touch sensor 12 to form a friendly man-machine interactive use interface; the touch sensor 12 may be a resistive touch sensor, an electromagnetic touch sensor, a sonic touch sensor, a vibration touch sensor, an optical touch sensor, or a combination of more than one of the above-mentioned touch sensors, in addition to the capacitive touch sensor, but the implementation range is not limited to the above-mentioned types.
The bottom plate 13 is a high light transmittance sheet selected from various glass, polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polycarbonate (PC) or cycloolefin copolymer (COC/COP), etc., but the implementation range is not limited to the above materials; the bottom surface of the bottom plate 13 is provided with a low refractive index transparent conductive film 13a, wherein the refractive index of the low refractive index transparent conductive film 13a must be smaller than the refractive index of the light guide plate 31 described later, preferably, the refractive index of the low refractive index transparent conductive film 13a is 1.0 or less, more preferably, the refractive index of the low refractive index transparent conductive film 13a is 0.7 or less; in one embodiment, the low refractive index transparent conductive film 13a is a metal film, which is formed by coating a metal material with good conductivity on the bottom surface of the bottom plate 13 through Evaporation (Sputtering) or other processes to form a metal film with a thickness of about 20-70 nm; for example, a metal film formed of a molybdenum (Mo) containing material having a refractive index of about 0.696. In addition, a light shielding frame 13b is disposed at the peripheral edge region of the bottom surface of the bottom plate 13, and the light shielding frame 13b can block the light from the point light source 32 and the light guide plate 31 below from directly entering the bottom plate 13 in the vertical direction, so as to form a ghost phenomenon of light interference near the black frame 11 a; the light shielding frame 13b is made of a material with light-proof or low light transmittance, such as ink or photoresist, and a thin film layer is formed by printing, sputtering, coating, etc.; wherein, the width of the light shielding frame 13b is smaller than or equal to the width of the black frame 11a along the peripheral edge of the bottom surface of the bottom plate 13.
The front lighting module 30 comprises a light guide plate 31, at least one point light source 32 is disposed at least one outer side edge of the light guide plate 31, and the point light source 32 is an LED or a Mico LED; the point light source 32 projects light from one end face of the light guide plate 31, and converts the projected light into a surface light source which emits light toward the bottom face of the light guide plate 31. The area of the light guide plate 31 approximately corresponds to the visual area of the electronic paper display module 50, so as to provide illumination light for the visual area. The material of the light guide plate 31 is selected from Polycarbonate (PC), polymethyl methacrylate (PMMA), and Polyester (PET), but the type of the material is not limited to the above; the refractive index of the light guide plate material is approximately between 1.47 and 1.51. In addition, in order to form a surface light source with uniformly distributed light brightness on the light guide plate 31, a plurality of light scattering points (not shown in the figure) may be disposed on the plate body of the light guide plate 31 to convert the incident light from the point light source 32 into light uniformly distributed on the plate body; wherein, the light-emitting points can be selected from materials with refractive index higher than that of the substrate of the light guide plate 31, or the concave holes or protruding bumps can be arranged on the plate body of the light guide plate 31, and the light-emitting points are distributed on the light guide plate 31 in a sparse and dense manner so as to achieve the effect of uniform light brightness distribution on the light guide plate 31.
The electronic paper display module 50 is a reflective display with low power consumption and flexibility, and uses electrophoresis technology or cholesterol liquid crystal technology to display the output signal on the display screen of the electronic paper display module 50 as an image.
As shown in fig. 2, the touch cover module 10, the front lighting module 30 and the electronic paper display module 50 are sequentially stacked together, so that the upper surface of the light guide plate 31 is attached to the bottom surface of the low refractive index transparent conductive film 13a, and since the refractive index of the low refractive index transparent conductive film 13a (e.g. a molybdenum metal film with a refractive index of 0.696) is far lower than that of the light guide plate 31 (typically with a refractive index of 1.47-1.51), a total reflection interface can be formed on the upper surface of the light guide plate 31, and the light incident into the light guide plate 31 from the side surface is not refracted upwards any more and is adversely affected by the black frame 11a, the problem of ghost phenomenon on the display screen near the black frame can be improved, so that the light in the light guide plate 31 can be concentrated on the visible area of the electronic paper display module 50 to provide good lighting; the low refractive index transparent conductive film 13a can form an electromagnetic shielding layer between the touch sensor 12 and the electronic paper display module 50 to prevent interference of EMI and RFI so as to avoid affecting normal operation of the touch sensor 12. In addition, the black frame 11a on the touch cover module 10 can shield the dot light source 32 and the peripheral circuit area of the electronic paper display module 50 at the edge of the front lighting module 30 below, so as to improve the aesthetic property of the whole device.
Although the utility model has been fully described with reference to the accompanying drawings in connection with the specific embodiments, it is to be understood that the foregoing embodiments are merely illustrative examples for further description and that the embodiments of the utility model are not limited thereto, but are to be construed as included within the scope of the utility model as defined by the appended claims.
Claims (10)
1. A touch electronic paper device with a front lighting structure, comprising:
the touch cover plate module is formed by overlapping a top plate, a touch sensor and a bottom plate into a whole, a black frame is arranged in the peripheral edge area of the bottom surface of the top plate, and a layer of low-refractive-index transparent conductive film is arranged on the bottom surface of the bottom plate;
the front lighting module is provided with a light guide plate, at least one point-shaped light source is arranged at the outer side edge part of the light guide plate, and the point-shaped light source projects light rays from the side end surface of the light guide plate so as to convert the projected light rays into a surface light source which is emitted to the bottom surface of the light guide plate; and
an electronic paper display module;
the touch cover plate module, the front lighting module and the electronic paper display module are sequentially overlapped to form a whole, so that the upper surface of the light guide plate is attached to the bottom surface of the low-refractive-index transparent conductive film, a total reflection interface is formed on the upper surface of the light guide plate, and an electromagnetic shielding layer is formed between the touch sensor and the electronic paper display module.
2. The touch electronic paper device with front lighting structure according to claim 1, wherein the refractive index of the low refractive index transparent conductive film is smaller than the refractive index of the light guide plate.
3. The touch electronic paper device with front lighting structure according to claim 2, wherein the refractive index of the low refractive index transparent conductive film is 1.0 or less.
4. The touch electronic paper device with front lighting structure according to claim 3, wherein the refractive index of the low refractive index transparent conductive film is 0.7 or less.
5. The touch electronic paper device with front lighting structure of claim 4, wherein the low refractive index transparent conductive film is a metal film, and the thickness of the metal film is below 70 nm.
6. The touch electronic paper device with front lighting structure of claim 5, wherein the low refractive index transparent conductive film is a molybdenum-containing metal film.
7. The touch electronic paper device with front lighting structure of claim 1, wherein the black frame is an opaque or low light transmittance film made of a non-conductive material.
8. The touch electronic paper device with front lighting structure according to claim 1, further comprising a light shielding frame disposed at a peripheral edge region of the bottom surface of the bottom plate, wherein the light shielding frame is a thin film layer formed of a light-impermeable or low-light-transmittance material.
9. The touch electronic paper device with front lighting structure according to claim 8, wherein the width of the light shielding frame is set to be smaller than or equal to the width of the black frame.
10. The touch electronic paper device with the front lighting structure according to claim 1, wherein the touch sensor is selected from a capacitive touch sensor, a resistive touch sensor, an electromagnetic touch sensor, a sonic touch sensor, a vibration wave touch sensor, an optical touch sensor, or a combination of more than one of the foregoing touch sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321081805.4U CN220085211U (en) | 2023-05-08 | 2023-05-08 | Touch electronic paper device with front lighting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321081805.4U CN220085211U (en) | 2023-05-08 | 2023-05-08 | Touch electronic paper device with front lighting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220085211U true CN220085211U (en) | 2023-11-24 |
Family
ID=88819897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321081805.4U Active CN220085211U (en) | 2023-05-08 | 2023-05-08 | Touch electronic paper device with front lighting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220085211U (en) |
-
2023
- 2023-05-08 CN CN202321081805.4U patent/CN220085211U/en active Active
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