TWI671561B - Curved light guide plate structure - Google Patents

Abstract

The invention relates to a device for improving the structure of a light guide plate. More specifically, we can use a curved light guide with multiple scores to guide light. The use of multiple scores on the light guide plate has the advantages of uniformly spreading the light and reducing the glare effect. The method of the present invention can save a lot of costs in the manufacturing process.

Description

Curved light guide plate structure

The present disclosure generally relates to a device for processing one or more curved light guide plates, and more particularly, a curved light guide plate has a plurality of first scores and a plurality of second scores, the plurality of first scores and The plurality of second scores cause the incident light rays to be refracted and reflected, and then guide the light rays to be emitted in parallel from the light emitting surface.

Generally speaking, light-emitting devices are mainly presented in two ways, one is to place the light-emitting elements in a traditional lamp; the other is to arrange the light-emitting elements uniformly, to locally reflect the light-emitting elements or to control the light on the light-emitting elements using an optical film .

Although, these two forms of presentation still fail to overcome the shortcomings of traditional lighting fixtures. These defects include the following: first, the directivity of the light irradiation is not controlled, which will cause the brightness of the illuminated area to be inconspicuous, that is, the light is irradiated to an unnecessary place, and the brightness of a part of the illuminated area is caused when the same light flux is generated decline. Secondly, the brightness of the light is not uniform, resulting in the brightness of the farther area can not reach the standard, in addition, the brightness of the nearer area is far higher than the standard, due to the uneven light distribution. Therefore, in order to achieve the brightness standard in both the far and near areas when the user uses the light-emitting element, the light-emitting element used has a higher power and higher luminous flux to meet the illuminance requirements of the dim area, resulting in electrical energy. Unnecessary consumption and waste.

In addition, traditional light-emitting devices cannot eliminate the glare phenomenon. The so-called glare phenomenon refers to the fact that when a user observes a certain visual object, the brightness of the light source in the field of vision greatly exceeds the background value. Worry, discomfort, or impaired vision. Generally speaking, glare can be divided into two types: direct glare or reflected glare. Direct glare is directly caused by the light source in the field of vision. When the light source is too concentrated, the light source is viewed directly or with afterglow. The brightness is high and dazzling, which is uncomfortable. The other is reflected glare, which is commonly known as reflection. Strongly directional light, easily reflects objects or paper, blurs the image, easily causes eye fatigue, and has trouble reading.

In order to solve the above problems, first, the directionality of the light irradiation is controllable; second, the problem of uneven brightness of the light; and third, the glare cannot be effectively eliminated or reduced. The present invention improves the structure of the light guide plate to overcome the existing problems.

In order to solve the problems mentioned in the prior art, the direct illumination of the light source causes obvious bright spots to be formed on the light guide plate, causing the problem of uneven light emission. The present invention provides a light emitting device having a curved light guide plate structure with a plurality of scores.

The invention provides a curved light guide plate structure, in particular to a curved light guide plate structure with semi-circular arc notches and triangular notches. A curved light guide plate structure includes: a plate body having a light entrance surface and a light exit surface; wherein the light exit surface includes at least one processing area, the light exit surface and the at least one processing area are parallel to each other and are respectively connected with the light entrance surface; The light planes intersect, and the light incident plane is used to receive a light beam emitted by a light source, and the light emitting plane is used to guide the light beam to exit; wherein the at least one processing area includes a plurality of first scores and a plurality of second scores Marks; the plurality of first notches are semi-circular arc notches, the first The notch has a radius and a circle center provided on the at least one processing area; the plurality of second notches are triangular-shaped notches, and the second notches have equal side lengths provided on the at least one processing area.

Furthermore, the light emitting source is an organic light emitting diode (OLED), a light emitting diode (LED), a cold cathode ray tube (CCFL), or a combination thereof.

Furthermore, the thickness of the curved light guide plate is between 3mm and 10mm, and the material is polymethyl methacrylate (PMMA) resin, cycloolefin hydrogen polymer (COP) or polycarbonate (PC).

Furthermore, the plurality of first scores and the plurality of second scores are a staggered arrangement in sequence.

Furthermore, the direction of the light beam emitted by the light source is 90 degrees with the direction of the light beam on the light emitting surface.

Furthermore, the center line of the plate is perpendicular to the light source.

Furthermore, the curved light guide plate structure and the light source together form a side light backlight module; the side light backlight module includes a reflective paper, a scattering film, and a reflective tape, the reflective paper The light guide plate is closely attached to one side of the curved light guide plate structure, the scattering film is closely attached to the other side of the curved light guide plate structure, and the reflective tape is attached to the top of the curved light guide plate structure.

Furthermore, the curved light guide plate structure further includes a first side surface, a second side surface, a third side surface, and a fourth side surface; wherein the first side surface and the third side surface In contrast, the second side surface is opposite to the fourth side surface, the length of the second side surface is greater than the length of the first side surface, and the length of the fourth side surface is greater than the length of the third side surface.

In another embodiment of the present invention, the plurality of the first scores and the plurality of the second scores are non-periodic and randomly disposed on the at least one processing area.

The foregoing brief description of the present invention aims to provide a basic description of several aspects and technical features of the present invention. The summary of the invention is not a detailed description of the invention, so its purpose is not specifically enumerated The key or important elements of the present invention are not intended to define the scope of the present invention, but merely to present several concepts of the present invention in a concise manner.

1‧‧‧light-emitting device

10‧‧‧ plate

20‧‧‧ Centerline

30‧‧‧ entrance

40‧‧‧light surface

50‧‧‧Reflective paper

60‧‧‧ scattering film

70‧‧‧Reflective tape

80‧‧‧light source

90‧‧‧ base element

101‧‧‧The first score

102‧‧‧Second score

201‧‧‧ the first side surface

202‧‧‧Second side surface

203‧‧‧ Third side surface

204‧‧‧ Fourth side surface

W1‧‧‧First pitch

W2‧‧‧Second Pitch

X‧‧‧first axis

Y‧‧‧ second axis

S1‧‧‧ long axis

S2‧‧‧ short axis

L1, L2, L3‧‧‧ Side Length

FIG. 1 is a schematic diagram of a curved light guide plate device according to a preferred embodiment of the present invention.

FIG. 2 is a schematic diagram of a first score and a second score of a curved light guide plate according to a preferred embodiment of the present invention.

FIG. 3 is a schematic diagram of a curved light guide plate and a light source forming a backlight module according to a preferred embodiment of the present invention.

FIG. 4 is a schematic diagram of staggered first and second scribes of a curved light guide plate according to a preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of a first score and a second score according to a preferred embodiment of the present invention.

In order to understand the technical features and practical effects of the present invention, and can be implemented in accordance with the contents of the description, the preferred embodiment shown in the drawings is further described in detail as follows: Please refer to FIG. 1, which is the present invention A schematic diagram of a curved light guide plate device of a preferred embodiment. A light emitting device 1 includes: a plate body 10 having a light incident surface 30 and a light emitting surface 40; a base member 90 having a plurality of light emitting sources 80; The light surface 30 is used to receive the light beam emitted by a light source 80, and the light output surface 40 is used to guide the light beam to be emitted. Will be guided to the direction of the light emitting surface 40, and after being adjusted by the plurality of first notches 101 and the plurality of second notches 102, the light beam is guided as a parallel light to be emitted.

The light emitting surface 40 includes at least one processing area, and the at least one processing area includes a plurality of first scores 101 and a plurality of second scores 102. The at least one processing area is provided with a plurality of A first axis X arranged at an equal interval at a distance W1 and a plurality of second axes Y arranged at an equal interval at a second interval W2, the first axes X and the second axes Y are intersected with each other and intersect to form A plurality of intersections, and the second axis Y is parallel to the light emitting surface 40. The first pitch W1 may be greater than, equal to, or smaller than the second pitch W2. In the present invention, the first pitch W1 may be smaller than the second pitch W2, which is a preferred embodiment.

Please refer to FIGS. 4 and 5. FIG. 4 is a schematic diagram of staggered arrangement of the first score and the second score of the curved light guide plate according to the preferred embodiment of the present invention. In this embodiment, the plurality of first scores 101 are semi-circular and are staggered at the intersections of the processing area, so that the plurality of second scores 102 are located on the second axes Y. A plurality of first notches 101 on the adjacent first axis X are in a staggered arrangement. The first notches 101 have a major axis S1 and a minor axis S2, and the length of the major axis S1. It is between 1.5mm and 3mm, and the length of the short axis S2 is between 1.5mm and 2mm. When the length of the long axis S1 is greater than the length of the short axis S2, it is an ellipse. Each of the long axes S1 and each The minor axis S2 may intersect at a center point vertically. In one of the embodiments, the preferred embodiment is that the length of the long axis S1 is equal to the length of the short axis S2, that is, a half arc shape. The semi-circular arc has a center and a radius. Each point in the semi-arc is equidistant from a point within the semi-arc. This point is called the center of the circle. The distance from any point on the circumference to the center of the circle is the radius of the circle. The length of the radius is between 1.5 mm and 3 mm, each radius overlaps the first axis X, and the centers of the circles are set at the intersections of the first axes X and the second axes Y. Also, referring to FIG. 5, FIG. 5 is a schematic diagram of a first score and a second score in a preferred embodiment of the present invention. The plurality of second scores 102 are triangular notches, and the triangular notches have a side length L1. , Side length L2, side length L3, when the side length L1 is equal to the side length L2, and the side length L3 is not equal to (greater than or less than) the side length L1, it is an isosceles triangle, and the isosceles triangle has two sides. Equal, so there will be two internal angles that are between 15 and 75 degrees. The preferred embodiment is between 30 and 60 degrees. The center of gravity of the isosceles triangle (triangle The three centerlines intersect at one point, so The point is called the center of gravity of this triangle) will be set at the intersection of the first axes X and the second axes Y. In one of the embodiments, the preferred embodiment is that the second score 102 is a regular triangle, and the three sides of the regular triangle are equal in length, that is, the side length L1 is equal to the side length L2 and the side length L3, The side length L1 is between 1mm and 3mm, and the preferred length is between 1.5mm and 2mm. The outer center, inner center, and center of gravity of the regular triangle will be at the same point, and will be set on the first axes X and the On the intersection of the second axis Y.

Please also refer to FIGS. 2 and 3 at the same time. FIG. 2 is a schematic view of the first score and the second score of the curved light guide plate according to the preferred embodiment of the present invention. The plate body 10 further includes a first side surface 201 and a second A side surface 202, a third side surface 203, and a fourth side surface 204, wherein the first side surface 201 is opposite to the third side surface 203, and the second side surface 202 is opposite to the fourth side surface 204, The length of the second side surface 202 will be greater than the length of the first side surface 201, and the length of the fourth side surface 204 will be greater than the length of the third side surface 203. FIG. 3 is a schematic diagram of a curved light guide plate and a light source forming a backlight module according to the embodiment. In FIG. 3 is another possible embodiment of the present invention, at the right side of the plate body 10 (that is, the second side surface 202) It has a scattering film 60, a reflective paper 50 at the left side of the plate body 10 (that is, the fourth side surface 204), and a reflective tape 70 at the top of the plate body 10 (that is, the third side surface 203). A light source 80 is provided below the plate body 10 (that is, the first side surface 201). The diffusing film 60 is a film for improving light uniformity but reducing brightness. The light source 80 emits a light that is scattered by the scattering film 60 to obtain uniform and better scattered light, which can be re-transmitted and can be set on the scattering film 60 to adjust the emission direction of the light from the direction of the light. The smooth surface 30 side is adjusted to the light output surface 40 side, and a plurality of first scores 101 and a plurality of second scores 102 are arranged in the processing area, so that the light passes through a plurality of semi-circular engravings inside the score. Refraction and reflection of the marks or triangular notches to achieve the uniform brightness of the light, and after a plurality of semicircular notches or triangular notches in the light guide plate, the light will not be concentrated at the same point, causing human eyes Dizziness, or the glare effect described earlier, is observed.

After the incident light passes through the light source 80, it enters the plate body 10 of the light guide plate. The line of entry of the light is as follows. The plate body 10 uses the total reflection characteristic of the light to guide the light beam to the far end, and uses each of the first One notch 101 and second notch 102 destroy the total reflection of the light beam. After the scattered light beam is incident on the first notch 101 or the second notch 102, it can be emitted from the light emitting surface 40 of the board 10, and the board 10 can The point light source or line light source is converted into a surface light source and emitted, so that the emitted light is a parallel light beam.

Each of the first scoring 101 and the second scoring 102 described in the present invention is provided on the processing surface of the plate 10 by machining, laser processing, or etching. The method of machining and laser processing can be transmitted through. The processing device senses the luminosity of each point light source, and determines whether the luminosity of each point light source is the same. If the luminosity of different sensing areas is different, the processing adjustment is performed according to the difference in luminosity of each point light source, so that each of the first scores 101 and the second The scores 102 may be simultaneously protruding from the processing surface, or may be simultaneously recessed from the processing surface. In a preferred embodiment of the present invention, each of the first scores 101 and the second scores 102 is the same as protruding from the processing surface. Machining surfaces. In another possible embodiment, each of the first scores 101 and the second scores 102 is non-periodic and randomly disposed on the at least one processing area. In other words, the first score The marks 101 and the second notches 102 are not regularly arranged (see FIG. 4), but appear in an irregular order, such as: two consecutive first notches 101 and one second notch 102 In the processing area, the present invention is not limited.

In this embodiment, the light emitting source 80 is, for example, a light emitting diode. However, this creation is not limited to this. In other embodiments, the light source 80 may also be other appropriate types of light emitting elements, such as a cold cathode fluorescent lamp (CCFL) or an organic light emitting diode. (organic light emitting diode, OLED) and so on.

Please refer to FIGS. 1 and 2. In this embodiment, the center line 20 of the plate is defined as entering from the center of gravity of the third side surface 203 through the interior of the plate 10 to the center of gravity of the first side surface 201. three The side surface 203 or the first side surface 201 may be a rectangle (the center of gravity of the rectangle is defined at the intersection of the corresponding midpoints of the two sides, or at the intersection of the diagonals), and the centerline 20 is a straight line. Through the plate body 10, the center line 20 is perpendicular to the plane where the light source 80 is located by 90 degrees.

However, the above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made in accordance with the scope of the patent application and the description of the present invention are still It is within the scope of the present invention.

Claims (6)

A curved light guide plate structure includes: a plate body having a light entrance surface and a light exit surface; wherein the light exit surface includes at least one processing area, and the light entrance surface is used to receive a light beam emitted by a light source, the The light-emitting surface is used to guide the light beam to exit; wherein the at least one processing area includes a plurality of first scores and a plurality of second scores; the plurality of first scores are semi-circular arc-shaped scores, and each first score The mark has a radius and a center of the circle on the at least one processing area; the plurality of second marks are triangular-shaped marks, and each second mark has an equal side length on the at least one processing area; The first score and each of the second scores are disposed at equal intervals in the at least one processing area, and each of the first scores and each of the second scores are sequentially staggered. The curved light guide plate structure according to claim 1, wherein the light emitting source is an organic light emitting diode (OLED), a light emitting diode (LED), a cold cathode ray tube (CCFL), or a combination thereof. The curved light guide plate structure according to claim 1, wherein the thickness of the curved light guide plate structure is between 3 mm and 15 mm, and the material is polymethyl methacrylate (PMMA) resin, cycloolefin hydrogen polymer (COP), or Polycarbonate (PC). The curved light guide plate structure according to claim 1, wherein the direction of the light beam emitted by the light source and the direction of the light beam on the light emitting surface are at an angle of 90 degrees. The curved light guide plate structure according to claim 2, further comprising a first side surface, a second side surface, a third side surface, and a fourth side surface; wherein the first side surface and the fourth side surface The third side surface is opposed, the second side surface is opposed to the fourth side surface, the length of the second side surface is greater than the length of the first side surface, and the length of the fourth side surface is greater than the third side surface length. The curved light guide plate structure according to claim 5, wherein the curved light guide plate structure and the light source together form a side light backlight module; the side light backlight module includes a reflective paper, a scattering film And a reflective tape, the reflective paper is closely attached to the fourth side surface of the curved light guide plate structure, the scattering film is closely attached to the second side surface of the curved light guide plate structure, and the reflective tape is attached to the curved guide The third side surface of the light plate structure.