TW201044037A - Light guide plate and backlight module using same - Google Patents

Abstract

A light guide plate comprises an incident surface and an emission surface. A plurality of V cuts are defined on the incident surface. A Fresnel lens is located between the adjacent V cuts. The extent of the V cut is perpendicular with the emission surface. A backlight module is also related.

Description

[0002] The invention relates to a light guide plate and a backlight module, and more particularly to a light guide plate with uniform light emission, high brightness and excellent optical performance, and a backlight mold using the same. group. [Prior Art] [0002] Since liquid crystal displays are light, thin, and consume less power, they are widely used in modern information devices such as notebook computers, mobile phones, and personal digital assistants. Because the liquid crystal itself does not have illuminating characteristics, it needs to provide a backlight module 〇 to realize the display function. The backlight module includes a light source and a light guide plate. The light source is disposed relative to the light incident surface of the light guide plate. The light guide plate guides the light source to emit a light beam, and converts the point light source or the line light source into a surface light source. [0004] Light-emitting diodes (LEDs) have been widely used in backlight modules in recent years due to their advantages of high brightness, long life, and anhydrous silver.

[0005] As shown in FIG. 1, in the backlight module 10 using an LED as a light source, due to the LED

The limitation of the divergence angle of the Q light source 13 occurs, the light column bright area 11 appears in the area of the light guide plate 17 near the LED light source 13, and the portion of the light guide plate 17 corresponding to the LED light source 13 passes through the light beam so that the shadow area 15 appears, which is called For the light column or the dark band phenomenon, which reduces the light uniformity of the light guide plate 17 [Invention] [0006] There is a need to provide a light guide plate with uniform light emission, high brightness and excellent optical performance, and the use of the light guide plate. Backlight module. [0007] A light guide plate comprising a light incident surface, an light output 098118392 connected to the light incident surface, a form number A0101, a third page, a total of 11 pages 0982031181-0 201044037, the light entrance surface is provided with a plurality of concave places The v-shaped slits described in the smooth surface have a Fresnel lens between adjacent V-shaped slits, and the extending direction of the V-shaped slits is perpendicular to the light-emitting surface. [0008] A backlight module includes a light guide plate and a light source, the light guide plate includes a light emitting surface that is connected to the light incident surface, and the light source is disposed on the light incident surface, and the light entering The surface is provided with a plurality of V-shaped grooves recessed into the light incident surface, and a Fresnel lens is disposed between adjacent V-shaped slits, and the extending direction of the V-shaped slits is perpendicular to the light-emitting surface. [0009] Preferably, the V-shaped slit includes a first inclined surface and a second inclined surface intersecting the first inclined surface, and an angle between the first inclined surface and the second inclined surface is greater than equal 20 degrees and less than or equal to 120 degree. [0010] Compared with the prior art, the light-guiding plate of the embodiment of the present invention has a plurality of V-shaped slits disposed on the light-incident surface thereof and a Fresnel lens between the adjacent V-shaped slits, and the light emitted by the light source is After the V-groove and the Fresnel lens are refracted, the light guide plate enters the light guide plate at a large divergence angle, thereby reducing the dark band area and improving the light utilization rate, thereby increasing the light-emitting brightness and uniformity of the backlight module. [Embodiment] The present invention will be further described in detail below with reference to the accompanying drawings. As shown in FIG. 2, the backlight module 20 of the embodiment of the present invention includes a light source 21 and a light guide plate 22. The light source 21 is for emitting a light beam, and the light guide plate 22 guides the light source 21 to emit the direction of propagation of the light beam, which is converted into a surface light source. [0013] The light guide plate 22 includes a light incident surface 23, a first side surface 25 connected to the light incident surface 23, a second side surface 26, and a light exit surface 27. The first side surface 25 and the second side surface 26 are located on both sides of the light incident surface 23. . The light guide plate 22 may be in the shape of a flat plate or a wedge, and may be made of a synthetic resin material such as polycarbonate (PC) or polymethyl methacrylate (ΡΜΜΑ). [0014] The light source 21 is disposed near the light incident surface 23, and the light emitted from the light source 21 enters the inside of the light guide plate 22 through the light incident surface 23, and is emitted by the light exit surface 27. The light source 21 is a point light source, which may be a light emitting diode or a bulb, etc., and may be configured with a plurality of different colors of light emitting diodes or bulbs to match the desired light source color and luminance. [0015] The illuminating surface 23 is disposed on a concave V-cut 24 having a first inclined surface 241 and a second inclined surface 242, and a first inclined surface 241 and a second The angle between the inclined faces 242 is a, and the adjacent V-shaped slits 24 have a spacing therebetween. Wherein, a 〇 [0016] is greater than or equal to 20 degrees and less than or equal to 120 degrees; the pitches may be equal or may be changed in a gradient, for example, increasing or decreasing from the first side 25 and the second side 26 toward the middle, respectively. Between adjacent V-shaped slits 24, a Fresnel lens 28 is provided which is a concentric arrangement of zigzag structures having a depth smaller than the depth of the V-shaped slits 24. [0017] The light emitted by the light source 21 has a certain divergence angle, and is diffused and refracted by the V-shaped slit 24 and the Fresnel lens 28 to enter the light guide plate 22. The divergence angle of the light entering the light guide plate 22 is greatly increased, thereby reducing The dark band area improves the brightness and uniformity of the backlight module 100. 098118392 Form No. A0101 Page 5 of 11 0982031181-0 201044037 Reward] Through the experimental simulation, the light guide plate 2 with the Philippine lens 28 is the angle of the shape of the groove 24 when the stomach is the following value ' / 3⁄4 degree is as follows Shown as follows:

[ 〇 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ [0021] In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0022] FIG. 1 is a schematic diagram of a backlight module in the prior art. 2 is a schematic diagram of a backlight module according to an embodiment of the present invention, which includes a light guide plate having a light entrance number 098118392, a form number Α0101, a sixth page, a total of 11 pages, a temperature of 982 〇 31181-〇 201044037. ❹ [Main component symbol description] [0024] Light guide plate 17, 20 Light source 13, 21 Light guide plate 22 Light-incident surface 23 First side surface 25 Second side surface 26 Light-emitting surface 27 V-shaped groove 24 First inclined surface 241 Second inclined surface 242 Philippine lens 28 backlight module 10 light column party area 11 shaded area 15 Ο 098118392 form number Α 0101 page 7 / total 11 pages 0982031181-0

Claims (1)

201044037 VII. Patent application scope: 1. A light guide plate comprising a light incident surface and a light exit surface connected to the human light surface, wherein the improvement is that the light surface of the person is provided with a plurality of concave people. The v-shaped slit has a phenanthrene lens between the adjacent v-shaped slits, and the v-shaped slit extends in a direction perpendicular to the light-emitting surface. 2. If you apply for a patent range! The light guide plate of the present invention, wherein: the v-shaped slit includes a first inclined surface and a second inclined surface intersecting the first inclined surface, and an angle between the first inclined surface and the second inclined surface is greater than or equal to 2 () Degree is less than or equal to 120 degrees. 3. The light guide plate of claim 2, wherein the angle between the first slope and the second slope is 30 degrees, 8 degrees, profit, _110 degrees or 120 degrees. 4. The light guide plate of claim 1, wherein: the spacing between adjacent ones of the grooving grooves is equal or gradient. 5. If the light guide plate according to item 4 of the patent application is applied, #令: the spacing between the adjacent grooves is reduced from the both sides to the middle or from both sides to the middle 〇'6. The light guide plate according to any one of claims 1 to 5, wherein the light guide plate has a flat plate shape or a wedge shape. a backlight module comprising a light guide plate and a light source, wherein the wire comprises a light-emitting surface connected to the light-incident surface, and the light source is disposed on the light-incident surface, wherein the light is improved by The surface is provided with a plurality of v-shaped slits for the light-incident surface. The adjacent v-shaped slits have a phenanthrene lens, and the extending direction of the v-shaped slits is perpendicular to the light-emitting surface. 8. The backlight module of claim 7, wherein: the light source 098118392 Form No. A0101 Page 8 of 11 0982031181-0 201044037 is a light emitting diode or a light bulb. 9. The backlight module of claim 7, wherein: the V-shaped slot includes a first slope and a second slope intersecting the first slope, the first slope and the first The angle between the two slopes is greater than or equal to 20 degrees and less than or equal to 120 degrees. 10. The optical module of claim 7, wherein: the spacing between adjacent V-shaped slots is equal or gradient. ❹ 098118392 Form No. A0101 Page 9 of 11 0982031181-0