KR100451383B1 - A light-guiding plate of surface-type source device - Google Patents

Abstract

The present invention relates to a light-guiding plate of surface-type light source device in which a reflection pattern is formed on a light reflection surface using a non-printing method, The reflective pattern is in the form of a triangular surface in which a hexagonal body is cut in the long axis direction, and the sidewalls of the reflective pattern are above the light critical angle (including the critical angle) on the light-inducing plate and are less than 90 degrees (90 degrees). A inclined bottom angle. On the other hand, the long axis angle of the above-described reflective pattern can be adjusted in the weak light source region to obtain uniform light and improve the brightness of light.

Description

A light-guiding plate of surface-type source device}

The present invention relates to a light guide plate of a surface type light source device that uses a non-printing method when forming a reflective pattern on a light reflective surface.

In the conventional light guide plate structure, as shown in FIG. 1, a circular (or square) pattern 11 is printed on the light reflecting surface 1 of the light guide plate to improve the output optic-energy of the light guide plate. In the conventional method only the pattern 11 and its relative distance are changed. That is, as the display board becomes larger and the size of the pattern 11 becomes larger, the distance from the light tube increases or decreases as the distance from the electron tube decreases. In recent years, as the thickness of display boards becomes thinner, the pattern on the light emitting surface becomes very important. That is, poor light uniformity has occurred in the display board. So, to avoid this problem, it is possible to increase the diffuse reflection element on the light-emitting surface, but this limits the brightness of the display board. In addition, manufacturing costs increase as the required components increase.

2 shows another conventional printing method. In the printing process, pattern 21 of light reflecting surface 2 is formed with a diffuse reflection surface 22 comprising a high refractive material or a high reflecting material to enhance the output light energy of the light-emitting surface. However, similarly, the change in pattern 21 is formed on the flat surface. Therefore, its efficiency improvement is limited.

Some manufacturers use an etching method instead of the printing method to form a pattern 31 on the light reflecting surface, and form a matted surface 32 over the pattern 31 to diffusely reflect incident light on the pattern 31. However, the sidewall 33 of the pattern 31 is a vertical wall which reduces the angle of incident light and thus reduces the output light energy.

In view of the above deficiencies, the main object of the present invention is to solve the above problems.

1 is a schematic diagram showing a pattern formed on a conventional light reflecting surface.

2 is an elevation view showing a pattern formed by a conventional printing method.

3 is an elevation view showing a pattern formed by a conventional etching method.

4 is a schematic diagram showing a pattern formed according to a particular embodiment of the present invention.

5 is an elevational view of the pattern formed in accordance with certain embodiments of the present invention.

6 is a schematic diagram showing light reflection (refraction) of the reflective pattern of the present invention.

7 is an elevational view of the reflective pattern of the present invention.

8 is a schematic diagram showing a change in the major axis angle of the reflective pattern of the present invention.

9 is a graph showing the difference in efficiency between the present invention and the technique by the conventional printing method.

<Explanation of symbols for the main parts of the drawings>

4 ... reflective pattern

5 ... incident light surface

6 ... light emitting surface

41 ... sidewalls

42 ... bottom

The present invention is to form reflective pattern 4 on the light reflective surface using a non-printing method. Non-printing is a prior art that need not be described further below. Referring to FIG. 4, the reflection pattern 4 shows a hexagonal body. Referring to FIG. 5, the side wall 41 of the reflective pattern 4 is inclined inwardly so that the side wall 41 has a base angle Φ. The base angle Φ is above the critical angle (including the critical angle) of the light on the light-inducing plate and less than 90 degrees (not including 90 degrees). Since the base angle Φ and the height d of the reflective pattern 4 can change the light path, this improves the light emission efficiency. As shown in FIG. 6, in the case where the sidewall 41 has an inclined base angle Φ, the limit of the incident light source can be reduced so that the incident angle of the light source becomes large. As shown in FIG. 7, the light utilization (ie, the result of secondary reflection on the light-emitting surface 6 of the lower surface 42 and the sidewalls 41) under the condition that more light sources can enter the reflection pattern 4 through the incident light surface 5. Can be increased to improve luminous intensity. In addition, the light reflection pattern 4 influences the light-emitting energy acting on one surface, and the partial length l and the major axis angle φ of the hexagonal body positively influence the output visual power. As such, the reflection pattern 41 on the light reflecting surface is not arranged in parallel as in the prior art and in addition the above-described angle can be adjusted as required. That is, as shown approximately in FIG. 8, in the region of weak light (or the distance from the light source), the reflection pattern 4 adjusts its long axis angle by the change of the long axis angle φ, whereby the output visual force is It can be effectively raised so that no bright-dark gradient is formed on the emitting surface. Therefore, uniform light with improved light application efficiency can be obtained even in a region far from the light source.

According to the present invention, the reflection pattern 4 is formed as a part of the hexagonal deformable body by the non-printing method, and by changing the base angle Φ and the major axis angle φ of the side wall 41, the efficiency of the visual force of the present invention (line B in Fig. 9) and As in comparing the efficiency by the conventional printing method (line A in Fig. 9), the present invention can improve the visual power gain efficiency.

Claims (4)

delete A light-guiding plate of surface-type light source device in which a reflection pattern is formed on a light reflection surface using a non-printing method, wherein the reflection pattern Wherein the sidewalls of have an inclined bottom angle, wherein the bottom angle of the sidewalls is greater than or equal to the light critical angle (including the critical angle) on the light-inducing plate and is less than 90 degrees (excluding 90 degrees). Light-inducing plate of surface-type light source device. A light-inducing plate of a surface type light source device in which a reflection pattern is formed on a light reflection surface by using a non-printing method, the sidewall of the reflection pattern having an inclined base angle, wherein the reflection pattern is a hexagonal body. Light-inducing plate of the surface type light source device, characterized in that) is cut in the long axis direction. A light-inducing plate of a surface type light source device in which a reflection pattern is formed on a light reflection surface by using a non-printing method, wherein the sidewall of the reflection pattern has an inclined base angle, wherein angle) is adjustable in the weak light source region.