Flexible front light guide structure with folded light path and reflective display screen

Abstract

The utility model discloses a flexible front light guide structure and reflection type display screen of folding light path, including front light guide film, its plane end is equipped with at least one light guide net point, flexible light source module, it includes setting in front light guide film at least one side multiple light sources and flexible light source substrate, wherein, flexible light source module is along the edge setting of front light guide film, and light source arrangement direction is perpendicular with the folding line of front light guide film, the density distribution of light guide net point is, the density of near light source side decreases gradually, and the density of far light source side increases gradually. The utility model discloses through changing the structure position of light source in front module, uses different spare materials to solve the problem of the uneven picture display when folding different angle positions.

Description

Technical Field

[0001] This utility model relates to the field of electronic paper folding display technology, and in particular to a flexible front light guide structure for folding optical paths and a reflective display screen. Background Technology

[0002] Foldable e-paper products combine e-ink screen technology and flexible display technology, achieving a perfect balance between visual comfort and dynamic interactivity. While these products display well under normal lighting conditions, they fail to display properly in low-light environments, such as at night. Therefore, we need a front-light structure that can still display correctly in low-light conditions.

[0003] Traditional e-paper products use a front-light module consisting of an LED light source, a front light guide plate, and an e-paper module. One side of the front light guide plate has light-guiding dots, and the other side is a smooth surface, which is tightly attached to the e-paper surface. When light enters the light guide plate, it is refracted into the e-paper, and the e-paper reflects the light to achieve image display. However, this traditional front-light structure is mainly suitable for flat e-paper products. The latest foldable e-paper alters the angle of the light guide plate during folding, causing changes in the light refraction angle and affecting the display effect. Therefore, how to overcome the interference caused by these folding angles while ensuring good display performance in foldable e-paper products has become a pressing problem. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology. To achieve the above objectives, a flexible front light guide structure with a folded optical path and a reflective display screen are adopted to solve the problems mentioned in the background technology.

[0005] A flexible front-end light guide structure with a folded optical path, comprising:

[0006] The front light guide film has at least one light guide dot on its flat end;

[0007] A flexible light source module includes multiple light sources disposed on at least one side of the front light guide film, and a flexible lamp source substrate;

[0008] The flexible light source module is arranged along the edge of the front light guide film, and the light source arrangement direction is perpendicular to the fold line of the front light guide film.

[0009] The density distribution of the light guide dots is such that the density decreases closer to the light source and increases further away from the light source.

[0010] As a further embodiment of this utility model: the material of the front light guide film is polycarbonate or optical-grade glass, and its thickness ranges from 0.05mm to 0.4mm.

[0011] As a further aspect of this utility model: the flexible lamp source substrate is made of a bendable polyimide substrate, and the light source wiring has a serpentine wiring structure.

[0012] As a further aspect of this utility model: the density gradient arrangement of the light guide dots is such that the dot density gradually increases for every 1cm increase in distance from the light source.

[0013] As a further aspect of this invention, it also includes an optical diffusion layer covering the surface of the light guide dots.

[0014] As a further embodiment of this utility model: the flat end of the front light guide film is the bonding surface, and the bonding surface is fully bonded to the electronic display layer through an optically transparent adhesive layer, wherein the difference between the refractive index of the optically transparent adhesive and the refractive index of the light guide film is ≤0.2.

[0015] As a further embodiment of this utility model: a light-free area is set at the position corresponding to the fold line, and the width of the area is 1.5-2 times the width of the fold line.

[0016] As a further embodiment of this utility model: the fold line is a parallel double fold structure, and the distance between the two folds is 1-3mm.

[0017] As a further embodiment of this utility model: the front light guide film has an arc transition structure in the folded area, and the radius of curvature R of the arc is ≥3mm.

[0018] The second aspect of the technical solution: a reflective display screen, comprising:

[0019] Electronic display layer;

[0020] A flexible front light guide structure with a folded optical path as described in any of the above-mentioned embodiments is adopted;

[0021] The touch sensor layer is located between the front light guide structure and the electronic display layer.

[0022] Compared with the prior art, the present invention has the following technical advantages:

[0023] By adopting the above technical solution, the problem of sudden changes in light intake during folding is completely solved by changing the traditional parallel folding line light source layout to a vertical layout and combining it with the serpentine wiring of the flexible lamp source substrate. Furthermore, the brightness uniformity is improved when the optical simulation display is folded. Attached Figure Description

[0024] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings:

[0025] Figure 1This is a schematic diagram of the flexible front light guide structure according to an embodiment of this application;

[0026] Figure 2 This is a vertical schematic diagram of the fold lines of the front light guide film in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram showing the light source placed in the front light guide film and bent together, according to an embodiment of this application.

[0028] Figure 4 This is a schematic diagram of the flexible light source module and the front light guide film according to an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of a tri-fold front light guide film according to an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the arc-shaped front light guide film according to an embodiment of this application.

[0031] In the diagram: 101, front light guide film; 102, light guide dots; 103, flexible light source module; 104, light source; 106, fold line; 107, optical diffusion layer; 108, optical transparent adhesive layer; 109, electronic display layer; 110, area without light; 111, touch sensor layer. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please refer to Figure 1 In this embodiment of the present invention, a flexible front light guide structure for a folded optical path includes:

[0034] The front light guide film 101 has at least one light guide dot 102 on its flat end;

[0035] The flexible light source module 103 includes a plurality of light sources 104 disposed on at least one side of the front light guide film 101, and a flexible lamp source substrate.

[0036] In this embodiment, light guide dots 102 are provided on one side of the front light guide film 101, or light guide dots 102 are provided on both ends of the film.

[0037] Specifically, when the front light guide film 101 adopts a single-sided light-incident structure, the light source (such as an LED light strip) is only arranged on the long side. The light enters the interior from this side and is reflected and scattered by the dot / microstructure design on the bottom or surface, and finally emitted uniformly from the front.

[0038] Meanwhile, the front light guide film 101 can also adopt a dual-side light-incident structure. The light source (such as an LED light strip) is symmetrically arranged on the two long sides. Light enters the interior from both sides simultaneously and mixes inside. The dot / microstructure layout of the bottom or surface is optimized to accommodate the incident light from both sides, ensuring sufficient light diffusion and ultimately achieving a uniform and high-brightness light output effect from the front.

[0039] In this embodiment, the light source can be selected from, but is not limited to, LED, miniLED, MicroLED, laser light source (LD), or other future-developing solid-state planar light source technologies. The specific light source type selected depends on the product's performance objectives (such as peak brightness, contrast ratio, HDR performance), cost requirements, energy efficiency specifications, and application scenarios (such as consumer TVs, professional monitors, automotive displays, etc.).

[0040] The flexible light source module 103 is arranged along the edge of the front light guide film 101, and the arrangement direction of the light source 104 is perpendicular to the fold line 106 of the front light guide film 101.

[0041] The density distribution of the light guide dots 102 is such that the density decreases on the side closer to the light source 104 and increases on the side farther away from the light source 104.

[0042] In this embodiment, the traditional front light module consists of an LED light source 104 (the light source 104 is positioned parallel to the fold line 106), a front light guide plate, and an electronic paper module. One side of the front light guide plate has light guide dots 102, and the other side is a smooth surface. The smooth surface of the front light guide plate is attached to the surface of the electronic paper. After the light enters the front light guide plate, it is refracted towards the electronic paper, and the electronic paper reflects the light out, so as to realize the display and viewing of the image on the electronic paper.

[0043] like Figure 2 As shown, the figure is a vertical schematic diagram of the fold line 106 of the front light guide film 101;

[0044] When the light source 104 is positioned parallel to the folding line 106, the output result of folding electronic paper is simulated by optical simulation software. It can be used at different folding angles, which is more similar to the use scenario of paper books. However, in folding products, the angle of light refraction changes due to the change of the light guide plate angle, resulting in areas without light and affecting the display effect of the image.

[0045] Among them, the LED light source 104, the entire structure requires the use of LED or mini LED light source 104 (mini LED is smaller than traditional LED) and flexible light source substrate and ribbon cable, which can be better applied to foldable electronic paper products. More light sources 104 can be arranged in the same area. When the product is folded, the LED or mini LED changes with the module without affecting the light intake of the light guide plate, so that the product has a better display effect. The application of flexible light source substrate and ribbon cable can be used on foldable products, which can better adapt to the folding function of the product, extend the service life, and bring customers a better use and display effect.

[0046] In this embodiment, the folding line 106 is set according to actual needs, and it includes one, two, three or more lines;

[0047] Alternatively, an electronic display screen with a fixed angle or curvature can be used;

[0048] In this embodiment, the front light guide film 101 is made of polycarbonate or optical-grade glass, and its thickness ranges from 0.05 mm to 0.4 mm.

[0049] In this embodiment, the flexible lamp source substrate is a bendable polyimide substrate, and the light source 104 wiring has a serpentine wiring structure.

[0050] In this embodiment, the density gradient arrangement of the light guide dots 102 is such that the dot density gradually increases for every 1cm increase in distance from the light source 104.

[0051] In this embodiment, an optical diffusion layer 107 is also included covering the surface of the light guide dot 102.

[0052] like Figure 3 As shown in the figure, the light source 104 is placed on the front light guide film 101 and bent together. The LED or miniLED light source 104 of the entire flexible front light guide structure is placed on or below the front light module (the position of the light source 104 is perpendicular to the folding line 106). During normal use, when the LED or miniLED light source 104 is turned on, the dots in the light guide plate evenly disperse the LED or miniLED light to the entire display surface to achieve a uniform display effect.

[0053] like Figure 4 As shown, the figure is a schematic diagram of the flexible light source module 103 and the front light guide film 101;

[0054] The flexible front light guide structure can be used at different angles. When folded, the LED or miniLED will bend together with the front light module. The position of the LED or miniLED light source 104 and the front light module does not change, and the amount of light entering each position of the light guide plate does not change. Without changing the dot pattern of the light guide plate, the light guiding effect is not changed, making the whole screen uniform and not affecting the display effect of the entire flexible front light guide structure.

[0055] In this embodiment, the planar end of the front light guide film 101 is the bonding surface, and the bonding surface is fully bonded to the electronic display layer 109 through the optically transparent adhesive layer 108. The difference between the refractive index of the optically transparent adhesive and the refractive index of the light guide film is ≤0.2.

[0056] In this embodiment, a light-free area 110 is provided at the position corresponding to the fold line 106, and the width of the area is 1.5-2 times the width of the fold line 106.

[0057] In this embodiment, one structure of the fold line 106 is a parallel double fold structure, with a distance of 1-3mm between the two folds.

[0058] like Figure 5 As shown, the figure is a schematic diagram of the triple-folded front light guide film 101 with a parallel double fold structure;

[0059] In this embodiment, the front light guide film 101 has an arc transition structure in the folded area, and the radius of curvature R of the arc is ≥3mm.

[0060] like Figure 6 As shown, the figure is a schematic diagram of the arc-shaped front light guide film 101;

[0061] The second aspect of the technical solution: a reflective display screen, comprising:

[0062] Electronic display layer 109;

[0063] A flexible front light guide structure with a folded optical path as described in any of the above-mentioned embodiments is adopted.

[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents, all of which should be included within the protection scope of the present invention.

Claims

1. A flexible front-mounted light guide structure with a folded optical path, characterized in that, include: The front light guide film (101) has at least one light guide dot (102) on its flat end. The flexible light source module (103) includes a plurality of light sources (104) disposed on at least one side of the front light guide film (101), and a flexible lamp source substrate; The flexible light source module (103) is arranged along the edge of the front light guide film (101), and the light source arrangement direction is perpendicular to the fold line (106) of the front light guide film. The density distribution of the light guide dots (102) is such that the density decreases near the light source and increases away from the light source.

2. The flexible front light guide structure for a folded optical path according to claim 1, characterized in that, The material of the front light guide film is polycarbonate or optical-grade glass, and its thickness ranges from 0.05mm to 0.4mm.

3. The flexible front-end light guide structure for a folded optical path according to claim 1, characterized in that, The flexible lamp source substrate is made of bendable polyimide substrate, and the light source wiring has a serpentine wiring structure.

4. The flexible front-end light guide structure for a folded optical path according to claim 1, characterized in that, The density gradient arrangement of the light guide dots (102) is such that the dot density gradually increases for every 1cm increase in distance from the light source.

5. The flexible front light guide structure for a folded optical path according to claim 1, characterized in that, It also includes an optical diffusion layer (107) covering the surface of the light guide dots (102).

6. The flexible front-end light guide structure for a folded optical path according to claim 1, characterized in that, The planar end of the front light guide film (101) is the bonding surface, and the bonding surface is fully bonded to the electronic display layer (109) through the optically transparent adhesive layer (108). The difference between the refractive index of the optically transparent adhesive layer and the refractive index of the light guide film is ≤0.

2.

7. The flexible front-end light guide structure for a folded optical path according to claim 1, characterized in that, The fold line (106) has a light-free area (110) at the fold position, and the width of the area is 1.5-2 times the width of the fold line.

8. The flexible front light guide structure for a folded optical path according to claim 7, characterized in that, The fold line (106) is a parallel double fold structure with a distance of 1-3 mm between the two folds.

9. The flexible front light guide structure for a folded optical path according to claim 1, characterized in that, The front light guide film has a circular arc transition structure in the folded area, with a radius of curvature R ≥ 3 mm.

10. A reflective display screen, characterized in that, include: Electronic display layer (109); A flexible front light guide structure with a folded optical path as described in any one of claims 1 to 9 is adopted.

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