High-brightness front light module and reflective display screen

Abstract

A highlight front light module disclosed by the present invention comprises a light guide plate, lattice points and a light source, the light guide plate comprises a first surface, a second surface and a third surface facing the light source, the first surface and the second surface are oppositely arranged, the second surface is a light emitting surface, the lattice points are arranged on the first surface, and the light source is arranged on the third surface. The distribution density of the lattice points is gradually increased along with the increase of the distance between the lattice points and the light source, the first surface is provided with a plurality of lattice point arrangement areas, and the light incidence angle of the lattice points in each lattice point arrangement area is increased along with the increase of the distance between the lattice point arrangement area and the light source. According to the high-brightness front light module, by designing the lattice point morphology and the arrangement mode of the light guide plate, the light rays are emitted from the light emitting surface in the collimation direction to the maximum extent, so that a reflective display screen carrying the front light module has the characteristic of high brightness, the display effect of the reflective display screen is effectively improved, and the product competitiveness is improved. The invention further discloses a reflective display screen.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical elements. Specifically, the present invention relates to a high-brightness frontlight module and a reflective display screen. Background Art

[0002] Nowadays, reflective display technology has developed rapidly. While playing the role of energy conservation and emission reduction, it can also protect the visual health of the people, and is expected to become an indispensable part of the future display industry. However, the display effect of a reflective display screen is poor when the ambient light is weak, and a frontlight module is required to provide light source supplementation for it.

[0003] The frontlight module mainly includes a light guide plate and a light source. The optical film in the traditional backlight module is not applicable in the frontlight module. Therefore, high requirements are put forward for the performance of the light guide plate itself.

[0004] In the prior art, due to the low reflectivity of the reflective display screen, the display brightness at night is still at a low level after the frontlight module is installed, and the display effect is poor. In the frontlight module, due to the lack of the functions of a diffusion film, a brightness enhancement film, and a reflective film, the light output effect mainly depends on the light control effect of the light guide dots on the light. Due to design defects in the morphology and arrangement of the light guide dots on the light guide plate, the light cannot be emitted from the light output surface in a collimated direction.

[0005] For example, the patent document with the publication number CN115933253A discloses a frontlight module, which includes: a light guide plate having a light incident surface, a first surface, and a second surface, the first surface and the second surface connecting the light incident surface and being opposite to each other; a light source disposed adjacent to the light incident surface; a plurality of first microstructures disposed at intervals and configured on the first surface; a light-transmitting cover plate; and a dielectric layer formed between the light guide plate and the light-transmitting cover plate and covering the surface of the first microstructures. The technical solution disclosed in this patent document also cannot solve the above-mentioned technical problems. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a high-brightness frontlight module, and the purpose is to make the reflective display screen equipped with this frontlight module have a high-brightness display effect.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a high-brightness frontlight module, including a light guide plate, dots, and a light source. The light guide plate includes a first surface, a second surface, and a third surface facing the light source. The first surface and the second surface are oppositely arranged, the second surface is the light output surface, the dots are arranged on the first surface, the distribution density of the dots gradually increases as the distance between the dots and the light source increases, and a plurality of dot arrangement areas are arranged on the first surface, and the light incident angle of the dots in each dot arrangement area increases as the distance between the dot arrangement area and the light source increases.

[0008] The dot is a concave dot or a convex dot.

[0009] The shape of the dot is a pyramid, a frustum of a pyramid, a cone or a frustum of a cone.

[0010] The light source is arranged on one side of the light guide plate, and n dot arrangement areas are provided. The light incident angle of the dots in each dot arrangement area satisfies d > T, where d is the distance between the center position of the dot arrangement area and the light source, and T is the thickness of the light guide plate. The light incident angles of the dots in the 1st to nth dot arrangement areas are respectively

[0011] The light sources are arranged on both sides of the light guide plate, and the light guide plate is located between the two light sources. n dot arrangement areas are provided. The light incident angle of the dots in each dot arrangement area satisfies d > T, where d is the distance between the center position of the dot arrangement area and the light source, and T is the thickness of the light guide plate. The light incident angles of the dots in the 1st to nth dot arrangement areas are respectively where d 1 = d n d 2 = d n-1 d 3 = d n-2 ......

[0012] where n ≥ 3.

[0013] The light guide plate is made of plastic or glass.

[0014] The refractive index of the light guide plate is 1.4 - 2.0.

[0015] The present invention also provides a reflective display screen, including the high-brightness front light module described above.

[0016] By designing the dot morphology and arrangement mode of the light guide plate, the high-brightness front light module of the present invention enables light to be emitted from the light-emitting surface in a collimated direction to the greatest extent, so that the reflective display screen equipped with the front light module has the characteristic of high brightness, effectively improves the display effect of the reflective display screen, and increases the product competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] This specification includes the following drawings, and the shown contents are respectively:

[0018] Figure 1 is a schematic structural diagram of the high-brightness front light module of the present invention;

[0019] Figure 2 is a schematic diagram of parameter definition;

[0020] Figure 3 Schematic diagram of the area distribution of dot arrangements when there is a single light source;

[0021] Figure 4 Schematic diagram of the area distribution of dot arrangements when there are two light sources;

[0022] In the figure, the markings are as follows:

[0023] 10. Light guide plate; 101. First surface; 102. Second surface; 103. Third surface; 11. Dots; 12. Light source; 13. First light source; 14. Second light source. Detailed implementation manners

[0024] The following further describes in detail the specific implementation manners of the present invention by describing the embodiments with reference to the accompanying drawings, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitate its implementation.

[0025] It should be noted that in the following embodiments, the "first", "second" and "third" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order, but are only for the convenience of description.

[0026] As Figure 1 shown, the present invention provides a high-brightness front light module, including a light guide plate 10, dots 11 and a light source 12. The light guide plate 10 includes a first surface 101, a second surface 102 and a third surface 103 facing the light source 12. The first surface 101 and the second surface 102 are located on opposite sides of the light guide plate 10. The second surface 102 is the light-emitting surface, and the third surface 103 is the light-incident surface. The first surface 101 is the top surface of the light guide plate 10, and the second surface 102 is the bottom surface of the light guide plate 10, that is, the second surface 102 and the first surface 101 are respectively located on the upper and lower sides of the light guide plate 10. Two third surfaces 103 are provided, and the first surface 101 and the second surface 102 are located between the two third surfaces 103. The third surfaces 103 are located on the left and right sides of the light guide plate 10. Dots 11 are provided on the first surface 101, and the distribution density of the dots 11 gradually increases as the distance between the dots 11 and the light source 12 increases. The distribution density of the dots 11 farther away from the light source 12 is greater. A plurality of dot arrangement areas are provided on the first surface 101, and all the dot arrangement areas are arranged in sequence along the length direction of the first surface 101. The dot arrangement area is the area where the dots 11 are arranged, and the light-incident angle of the dots in each dot arrangement area increases as the distance between the dot arrangement area and the light source 12 increases.

[0027] As Figure 1As shown, the light source 12 is disposed outside the third surface 103 of the light guide plate 10. The light source 12 is at a certain distance from the third surface 103. The closer the light source 12 is to the third surface 103, the higher the light incident efficiency.

[0028] Preferably, the light guide plate 10 can be made of, including but not limited to, plastic or glass, and the refractive index of the light guide plate 10 is 1.4 to 2.0. The function of the light guide plate 10 is to regulate the light rays incident from the two side light sources 12 and change the propagation direction so that the light rays are emitted from the second surface 102.

[0029] The light source 12 is a light emitting diode (LED). The light guide plate can be single-sided light incident or double-sided light incident, that is, whether to set the light source 12 on the two side surfaces of the light guide plate can be determined according to actual needs. The number of the light sources 12 can be set by itself and can be arranged at equal intervals.

[0030] As Figure 1 shown, the dot 11 can be a convex dot or a concave dot. The dot 11 is surrounded by a top surface, a bottom surface and a side surface according to its shape. The included angle between the top surface and the side surface of the dot 11 is the light incident angle θ. The shapes of the dots 11 include but are not limited to pyramid, frustum of a pyramid, cone, frustum of a cone, etc. The arrangement density of the dots 11 gradually increases as the distance between the dots 11 and the light source 12 increases.

[0031] The included angle between the top surface and the side surface of the dot (or the included angle between the bottom surface and the side surface) is the light incident angle θ, and the magnitude of the light incident angle θ will affect the propagation direction of the light. As Figure 2 shown, when a beam of light with an incident angle of α is reflected by a dot with a light incident angle of θ, the incident angle after reflection will become α - 2θ. When α - 2θ = 0°, that is, the reflected light is just in the collimated direction. Since the size of a single dot is negligible compared to the entire light guide plate, the incident angle α of the light can be expressed as At this time, when α - 2θ = 0°, it can be obtained that:

[0032]

[0033] In the formula, d is the distance between the dot and the light source, and T is the thickness of the light guide plate. At this time, the dots that satisfy the light incident angle θ will reflect the light and emit it from the second surface 102 in the collimated direction.

[0034] Embodiment 1

[0035] As Figure 3 shown is the top view of the top surface 101 of the light guide plate. In this embodiment, the light source is disposed on one side of the light guide plate. The first light source 13 faces the third surface 103 of the light guide plate. The distribution density of the dots farther away from the light source is greater. n dot arrangement areas are set, and the light incident angles of the dots in each dot arrangement area satisfy d > T, where d is the distance between the center position of the dot arrangement area and the light source, and T is the thickness of the light guide plate. The light incident angles of the dots in the 1st to nth dot arrangement areas are respectively n is a positive integer and n ≥ 3, d 1 is the distance between the center position of the 1st dot arrangement area and the first light source 13, d 2 is the distance between the center position of the 2nd dot arrangement area and the first light source 13, d 3 is the distance between the center position of the 3rd dot arrangement area and the first light source 13...... d n is the distance between the center position of the nth dot arrangement area and the first light source 13, d 1 、d 2 、d 3 ...... d n gradually increases.

[0036] As Figure 3 shown, the distance between the 1st dot arrangement area and the first light source 13 is the smallest, and the distance between the nth dot arrangement area and the first light source 13 is the largest. The 1st dot arrangement area, the 2nd dot arrangement area...... the nth dot arrangement area are arranged in sequence along the length direction of the first surface.

[0037] In this embodiment, for the light rays emitted from the LED light source at different angles, by designing the light guide plate in zones, different areas of the light guide plate have specific dot light incident angles, so that most of the light rays are emitted in a collimated direction, thereby improving the display brightness of the reflective display.

[0038] Embodiment 2

[0039] As Figure 4 shown is the top view of the top surface 101 of the light guide plate. In this embodiment, the light sources are arranged on both sides of the light guide plate. The two light sources are respectively the first light source 13 and the second light source 14, and the first light source 13 and the second light source 14 respectively face two third surfaces 103 at both ends of the light guide plate.

[0040] When the light guide plate adopts double-sided light input: the dots are symmetrically distributed about the center of the light guide plate, and the distribution density of the dots farther away from the light source is greater.

[0041] n dot arrangement areas are set, and the light incident angles of the dots in each dot arrangement area satisfy d > T, where d is the distance between the center position of the dot arrangement area and the light source, and T is the thickness of the light guide plate. The light incident angles of the dots in the 1st to nth dot arrangement areas are respectively

[0042] Wherein, n and k are positive integers, and n≥3, k<n, d 1 is the distance between the center position of the first dot arrangement area and the first light source 13, d 2 is the distance between the center position of the second dot arrangement area and the first light source 13, d 3 is the distance between the center position of the third dot arrangement area and the first light source 13...... d k is the distance between the center position of the k-th dot arrangement area and the first light source 13, d n is the distance between the center position of the n-th dot arrangement area and the second light source 14, d n-1 is the distance between the center position of the (n - 1)-th dot arrangement area and the second light source 14...... d k+1 is the distance between the center position of the (k + 1)-th dot arrangement area and the second light source 14, d 1 , d 2 , d 3 ...... d k increases gradually, d n , d n-1 ...... d k+1 decreases gradually, d 1 = d n , d 2 = d n-1 , d 3 = d n-2 ...... d k = d k+1 .

[0043] As Figure 4 shown, the distance between the first dot arrangement area and the first light source 13 is the smallest, the distance between the k-th dot arrangement area and the first light source 13 is the largest, the distance between the n-th dot arrangement area and the second light source 14 is the smallest, the distance between the (k + 1)-th dot arrangement area and the second light source 14 is the largest, and the first dot arrangement area, the second dot arrangement area...... the n-th dot arrangement area are arranged in sequence along the length direction of the first surface.

[0044] In this embodiment, for the light rays emitted by the LED light source at different angles, by partitioning the design of the light guide plate, different areas of the light guide plate have specific dot light-incident angles, so that most of the light rays are emitted in a collimated direction, thereby improving the display brightness of the reflective display.

[0045] The present invention also provides a reflective display screen, including the high-brightness front light module with the above structure. The specific structure of this high-brightness front light module can refer to Figures 1 to 4, which will not be elaborated here. Since the reflective display screen of the present invention includes the high-brightness front light module in the above embodiments, it has all the advantages of the above high-brightness front light module.

[0046] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. High-brightness frontlight module, comprising a light guide plate, light dots and a light source. The light guide plate includes a first surface, a second surface and a third surface facing the light source. The first surface and the second surface are oppositely arranged, and the second surface is the light-emitting surface. The light dots are arranged on the first surface. Characterized in that: The distribution density of the light dots gradually increases as the distance between the light dots and the light source increases. A plurality of light dot arrangement areas are provided on the first surface, and the incident light angles of the light dots in each light dot arrangement area increase as the distance between the light dot arrangement area and the light source increases.

2. The high-brightness frontlight module according to claim 1, Characterized in that: The light dots are concave dots or convex dots.

3. The high-brightness frontlight module according to claim 1, Characterized in that: The shape of the light dots is a pyramid, a frustum of a pyramid, a cone or a frustum of a cone.

4. The high-brightness frontlight module according to any one of claims 1 to 3, Characterized in that: The light source is arranged on one side of the light guide plate, and n dot arrangement areas are provided. The light incident angles of the dots in each dot arrangement area satisfy d > T, where d is the distance between the center position of the dot arrangement area and the light source, and T is the thickness of the light guide plate. The light incident angles of the dots in the 1st to nth dot arrangement areas are respectively 5. The high-brightness frontlight module according to claim 4, Characterized in that: n≥3.

6. The high-brightness frontlight module according to any one of claims 1 to 3, Characterized in that: The light sources are arranged on both sides of the light guide plate, the light guide plate is located between two light sources, and n dot arrangement areas are provided. The light incident angles of the dots in each dot arrangement area satisfy d > T, where d is the distance between the center position of the dot arrangement area and the light source, and T is the thickness of the light guide plate. The light incident angles of the dots in the 1st to nth dot arrangement areas are respectively wherein, d 1 = d n , d 2 = d n-1 , d 3 = d n-2 ......。 7. The high-brightness frontlight module according to claim 6, Characterized in that: n≥3.

8. The high-brightness frontlight module according to any one of claims 1 to 7, Characterized in that: The light guide plate is made of plastic or glass.

9. The high-brightness frontlight module according to any one of claims 1 to 8, Characterized in that: The refractive index of the light guide plate is 1.4 to 2.

0.

10. Reflective display screen, Characterized in that: Comprising the high-brightness frontlight module according to any one of claims 1 to 9.

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