TWI703383B - Light guide plate, backlight module and display - Google Patents

Abstract

The present invention relates to a light guide plate, which has a body, a plurality of recesses, and a plurality of light splitting grooves. A side surface of the body is defined as a light incident surface, and a top surface of the body is defined as a light exit surface. A concave part is recessed on the light incident surface of the body. The plurality of light-splitting grooves are arranged on the light-emitting surface of the main body and correspond to the positions of the recesses respectively. A distance is formed between each light-splitting groove and the light-incident surface, and a light-splitting groove is formed on the side close to the light-incident surface of each light-splitting groove Point and a total reflection surface extending from the beam splitting point to both sides, away from the light incident surface, and having a total reflection effect for part of the light source entered by the recess, thereby forming a kind of light-darkness difference between the two luminous bodies , To reduce the energy dark area of the light guide plate.

Description

Light guide plate, backlight module and display

The present invention relates to a light guide plate, in particular to a light guide plate that can provide a total reflection effect to part of the light sources to reduce the difference between brightness and darkness between the light sources.

Please refer to FIG. 6, the backlight module of the existing liquid crystal display mainly uses a luminous body 52 such as a light emitting diode (LED) as a light source, and a light guide plate 50 is used to evenly distribute the light source emitted by the luminous body 52 throughout the guide. The light plate 50 provides a display panel as a backlight module. However, because the luminous bodies 52 of the existing light source are arranged at intervals, an energy dark zone is formed between two adjacent luminous bodies, especially when the light After the light emitted by the body 52 enters the light guide plate 50, due to the phenomenon of light refraction, the traveling angle of the light becomes smaller, thus increasing the energy dark area. Therefore, the existing light guide plate 50 needs to be further improved to reduce energy The occurrence of dark areas.

Therefore, in view of the problem of the energy dark area of the existing light guide plate, the inventors have finally developed an invention that can improve the existing shortcomings after continuous experiments and research.

The main purpose of the present invention is to provide a light guide plate, which can reduce the occurrence of energy dark areas, so that the light energy of the light source is more evenly distributed on the entire display surface, so as to achieve the purpose of improving the display effect of the display.

To achieve the above object, the present invention provides a light guide plate, which includes: a body, a side surface of the body is defined as a light incident surface, a top surface of the body is defined as a light exit surface; Recessed on the light incident surface of the main body; and A plurality of light-splitting grooves are arranged on the light-emitting surface of the main body and respectively correspond to the positions of the recesses. A distance is formed between each light-splitting groove and the light-incident surface, and each light-splitting groove is close to the light-incident surface A light splitting point is formed on one side of the light splitting point and a total reflection surface extending from the light splitting point to both sides, away from the light incident surface, and having a total reflection effect for part of the light source entering from the concave portion; wherein each light splitting groove is far away from the One side of the light incident surface forms a concave arc surface whose center is far away from the light incident surface, and opposite ends of the concave arc surface are respectively connected to opposite ends of the total reflection surface.

With the above technical means, the present invention can use the total reflection surface on each beam splitter, so that after the light emitted by the luminous body enters the body from the light incident surface of the body, part of the light reaches the total reflection surface of the opposing beam splitter. , Will be reflected due to the principle of total reflection, increase the angle of travel of the light and deviate further from the splitting point to enter the dark energy zone between the two luminous bodies. In this way, the reflected light can effectively reduce the space between the two luminous bodies. The energy dark area of the light source can be more evenly distributed on the entire body to provide a better backlight effect of the display.

10: body

12: Glossy surface

14: Glossy surface

20: recess

30: Spectroscopic slot

32: split point

34: Total reflection surface

36: concave arc

38: display panel

40: luminous body

50: light guide plate

52: luminous body

Figure 1 is a partial perspective view of the present invention.

Figure 2 is a partial top view of the present invention.

Figure 3 is a schematic diagram of the present invention in operation.

Figure 4 is a schematic side view of the display of the present invention.

Figure 5 is a partial top view of another embodiment of the present invention.

Fig. 6 is a schematic top view of a conventional backlight module.

The present invention relates to a light guide plate, a backlight module and a display. Please refer to Figures 1 and 2 together. It can be seen from the figures that the light guide plate of the present invention mainly includes a body 10, a plurality of recesses 20 and a plurality of light splitting grooves 30 .

A side surface of the main body 10 is defined as a light-incident surface 12, a top surface of the main body 10 is defined as a light-emitting surface 14, and the plurality of recesses 20 are recessed on the light-incident surface 12 of the main body 10. The light-splitting grooves 30 are arranged on the light-emitting surface 14 of the main body 10 and respectively correspond to the positions of the recesses 20. Each light-splitting groove 30 is formed with a distance from the light-incident surface 12, and each light-splitting groove 30 is close to the light-incident surface 12 There is a light splitting point 32 and a total reflection surface 34 extending from the light splitting point 32 to both sides, away from the light incident surface 12, and having a partial light source entering from the recess 20 to form a total reflection effect. Each of the light splitting grooves 30 The total reflection surface 34 is a surface with curvature, preferably a surface with varying curvature. With the total reflection surface 34 showing varying curvature, the curvature of each position can be precisely controlled, so that the The light can achieve the total reflection effect, ensuring that the light can be reflected and enter the dark energy zone between the two luminous bodies 40. In addition, as shown in FIG. 5, the total reflection surface 34 with each curvature can be formed by multiple continuous small planes. In this way, the convenience of opening the mold of the main body 10 can be improved, and the overall production cost can be reduced.

The side of each light splitting groove 30 away from the light incident surface 12 is formed with a concave arc surface 36 whose center is away from the light incident surface 12, and opposite ends of the concave arc surface 36 are respectively connected to opposite ends of the total reflection surface 34, and The maximum width of each dichroic groove 30 can be greater than the maximum width of the opposing concave portion 20, so that when the light emitted by the luminous body 40 enters the main body 10 through the concave portion 20, it will not be refracted inward as shown in FIG. The angle of travel is maintained at the original angle, or compared to the form shown in Fig. 6 with an outwardly expanded angle as shown in Fig. 3, a larger width of the beam splitter 30 can be used to effectively reflect light to improve The probability of the reflected light entering the dark energy zone between the two luminous bodies 40.

A light-emitting source is arranged on one side of the light-incident surface 12 of the main body 10 to form a backlight module. The light-emitting source includes a plurality of light-emitting bodies corresponding to the concave portions 20 of the light-incident surface 12 of the main body 10 respectively. 40. Each light-emitting body 40 may be a light-emitting diode (LED). Please refer to FIG. 4, and a display panel 38 is provided on one side of the light-emitting surface 14 of the light guide plate body 10 to form a display.

In this way, please refer to FIG. 3. When the light emitted by the luminous body 40 enters the body 10 from the light-incident surface 12 of the body 10, some of the light rays reach the total reflection surface 34 of the opposing beam splitter 30 due to Based on the principle of total reflection, it travels toward the light incident surface 12 of the main body 10, increasing the traveling angle of the light, and further deviating from the beam splitting point 32 to enter the dark energy zone between two adjacent luminous bodies 40. The reflected light can effectively reduce the energy dark area between the two light-emitting bodies 40, so that the light emitted by the light-emitting source can be more evenly distributed on the entire body, so as to provide a better backlight effect of the display.

In addition, each concave portion 20 is in the shape of a concave arc in the direction of the light-emitting surface 14 of the main body 10. In more detail, when each concave portion 20 has a semicircular cross-section, and each opposing light-emitting body 40 is provided in each concave portion 20 At the center of the circle, part of the light source emitted by the luminous body 40 will directly enter the body 10 when entering the body 10 from the light-incident surface 12, and there will be no refraction. This can avoid the reduction of light travel due to refraction. Angle to improve the overall light guide effect of the light guide plate.

Furthermore, because the side of each dichroic groove 30 away from the light-incident surface is formed with a concave arc surface 36 away from the light-incident surface 12, so that the light that is not reflected by the total reflection surface 34 enters the dichroic groove 30, the concave arc surface 36 can provide the light entering the light splitting groove 30 with an astigmatism effect like a concave lens, so that the light entering the light guide plate body 10 from the concave arc surface 36 can be further divergent outward, and the light emitted by the luminous body 40 The light can be more evenly distributed on the body 10 of the entire light guide plate, so that the light energy of the backlight module is more uniform, and the overall display effect of the display is improved.

10: body

12: Glossy surface

14: Glossy surface

20: recess

30: Spectroscopic slot

32: split point

34: Total reflection surface

36: concave arc

Claims (9)

A light guide plate includes: a body, a side surface of the body is defined as a light-incident surface, a top surface of the body is defined as a light-emitting surface; a plurality of recesses are recessed in the entrance of the body Light surface; and a plurality of light splitting grooves are provided on the light emitting surface of the body, and respectively correspond to the positions of the recesses, each light splitting groove is formed with a distance between the light incident surface, and each light splitting groove A side close to the light incident surface is formed with a light splitting point and a total reflection surface extending from the light splitting point to both sides, away from the light incident surface, and having a partial light source entering from the concave portion to form a total reflection effect; wherein The side of each light splitting groove away from the light incident surface forms a concave arc surface whose center is away from the light incident surface, and opposite ends of the concave arc surface are respectively connected to opposite ends of the total reflection surface. The light guide plate according to claim 1, wherein the total reflection surface of each light splitting groove is a surface with curvature. The light guide plate according to claim 2, wherein the total reflection surface of each light splitting groove is a surface with a variable curvature. The light guide plate according to claim 1, wherein the total reflection surface of each light splitting groove is composed of a plurality of continuous small planes. The light guide plate according to any one of claims 1 to 4, wherein the maximum width of each dichroic groove is greater than the maximum width of the opposite recess. The light guide plate according to claim 1, wherein the concave portion is in a concave arc shape in the direction of the light emitting surface of the body. A backlight module, comprising the light guide plate according to any one of claims 1 to 6; and a light source, which is arranged on one side of the light incident surface of the body and includes a plurality of respective The luminous body on the concave portion corresponding to the light incident surface of the main body. According to claim 7, the backlight module, wherein each concave portion has a semicircular cross section, and each opposite light-emitting system is arranged at the center of each concave portion. A display includes the backlight module described in claim 7 or 8; and a display panel arranged on one side of the light emitting surface of the light guide plate.

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