CN201050739Y

CN201050739Y - Light guide plate and liquid crystal display device

Info

Publication number: CN201050739Y
Application number: CNU2007201520263U
Authority: CN
Inventors: 陈嘉钧
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-06-20
Filing date: 2007-06-20
Publication date: 2008-04-23
Anticipated expiration: 2017-06-20

Abstract

The light guide plate of the utility model at least comprises a light incident surface, a bottom surface intersected with the light incident surface and a light emergent surface opposite to the bottom surface, and the light source is arranged at one side corresponding to the light incident surface; the light emitting surface and the bottom surface are respectively provided with a first group of cutting grooves and a second group of cutting grooves, the cross section of each cutting groove of the first group of cutting grooves and the cross section of each cutting groove of the second group of cutting grooves are provided with a vertex angle, a first oblique angle and a second oblique angle, the value range of the vertex angle in each cutting groove of the first group of cutting grooves is 75-150 degrees, the value range of the first oblique angle in each cutting groove of the second group of cutting grooves is 35-55 degrees, so that the passing light rays are emitted out in a total reflection mode at a certain light emitting angle, the loss of large-angle light can be avoided, the light utilization rate is improved, the arrangement of a prism sheet and a diffusion sheet.

Description

LGP and liquid crystal indicator

Technical field

The utility model relates to a kind of light conducting plate structure improvement, aims to provide a kind of loss of avoiding wide-angle light, improves light utilization efficiency, and the setting that can save prismatic lens and diffusion sheet, to reach the light conducting plate structure improvement of slimming design.

Background technology

General liquid crystal indicator (Liquid Crystal Display, LCD) backlight module (BackLight Unit, BLU) basic structure is formed as shown in Figure 1, by LGP (LGP) 11, be located at LGP 11 plate edge positions light source 12, be located at the reflection diaphragm 13 of LGP 11 belows, and the assemblies of being located between LGP 11 and the liquid crystal panel 17 such as blooming piece constitute.

Wherein, the major function of LGP 11 is to convert the directional light of light source 12 incidents to the plane vertical light by light principle at random, but in order to reach all effects of light of scattering, usually set blooming piece between LGP 11 and liquid crystal panel 17, it is mainly in regular turn by down diffusion sheet 14, two prismatic lenses 15 and go up diffusion sheet 16 and formed, with the equal effect of light of scattering; Each prismatic lens 15 upper face is provided with prism structure 151 (prism structure is continuous sawtooth channel form), it receives by LGP 11 and reaches diffusion sheet 14 light down, and after prism structure 151 refractions via each prismatic lens, it is big that the lighting angle of its light becomes, and then make the visual angle change make brightness reduce greatly.

So liquid crystal indicator structure is as shown in Figure 2 also arranged, its by LGP (LGP) 11, be located at LGP 11 plate edge positions light source 12, be located at the reflection diaphragm 13 of LGP 11 belows, and the assemblies of being located between LGP 11 and the liquid crystal panel 17 such as blooming piece constitute; Wherein, this blooming piece mainly is made up of an inverse edge eyeglass 15 ' and last diffusion sheet 16 in regular turn, the bottom surface of its inverse edge eyeglass 15 ' also is provided with plural prism structure 151 ', when light is penetrated by LGP 11 and when entering inverse edge eyeglass 15 ', can dwindle the rising angle of light, and then dwindle the visual angle and make brightness improve.

Yet above-mentioned two kinds of liquid crystal indicator structures all utilize the use that increases the number blooming piece not only to increase cost, and the assembling of its each blooming piece, also can increase the thickness of this liquid crystal indicator, have run counter to light, thin, short, little demand.

The utility model content

In view of this, the purpose of the utility model LGP and liquid crystal indicator is to provide a kind of loss of avoiding wide-angle light, improves light utilization efficiency, and the setting that can save prismatic lens and diffusion sheet, to reach the light conducting plate structure improvement of slimming design.

The solution of the utility model LGP and liquid crystal indicator, this LGP include an incidence surface, one and this incidence surface bottom surface of intersecting at least, and an exiting surface relative with this bottom surface, and light source then is arranged at a side that should incidence surface; Wherein, this exiting surface and bottom surface are respectively equipped with first and second group grooving, the cross section of its first and second group grooving each grooving has a drift angle, one first oblique angle and second oblique angle, span 75 degree～150 degree of drift angle in this first group of each grooving of grooving, span 35 degree～55 degree at first oblique angle in this second group of each grooving of grooving are so that the light that passes through is penetrated with certain rising angle by the total reflection mode.

The beneficial effect of the utility model LGP and liquid crystal indicator is: can obtain a kind of loss of avoiding wide-angle light, improve light utilization efficiency, and the setting that can save prismatic lens and diffusion sheet, to reach the LGP and the liquid crystal indicator of slimming design.

Description of drawings

Fig. 1 is first kind of structural representation of commonly using backlight module;

Fig. 2 is second kind of structural representation of commonly using backlight module;

Fig. 3 is the structural perspective of LGP first embodiment in the utility model;

Fig. 4 is the structural representation that the LGP drift angle amplifies in the utility model;

Fig. 5 is the structural representation of LGP second embodiment in the utility model;

Fig. 6 is the structural perspective of LGP the 3rd embodiment in the utility model.

[figure number explanation]

Vertex angle theta LGP 11

Light source 12 reflection diaphragms 13

Following diffusion sheet 14 prismatic lenses 15

Prism structure 151 inverse edge eyeglasses 15 '

Prism structure 151 ' is gone up diffusion sheet 16

Liquid crystal panel 17 LGPs 20

Incidence surface 21 exiting surfaces 22

Bottom surface 23 light sources 30

The first grooving group, 24 second grooving groups 25

The specific embodiment

The utility model LGP and liquid crystal indicator, being primarily aimed in the side light type back light module framework LGP is improved, as shown in Figure 3, its LGP 20 plate ends are divided into incidence surface 21, its front portion is an exiting surface 22, and with respect to exiting surface 22 and the bottom surface 23 that has incidence surface 21 to intersect, and light source 30 is arranged at a side that should incidence surface 21, its light source 30 can be spot light (as light emitting diode), make light be able to inject from this incidence surface 21, exiting surface 22 by LGP 20 fronts penetrates again, to reach the effect that light source shows.

Focusing on of this case: this exiting surface 22 and bottom surface 23 are provided with first, two groups of

groovings

24,25, embodiment as shown in the figure, this is first years old, two groups of

grooving groovings

24,25 is the structure of V-groove, its cross section has a drift angle γ, the one first oblique angle β and the second oblique angle α, as shown in Figure 4, the span of drift angle γ is 75 degree～150 degree in these first group of grooving, 24 each groovings, the span of the first oblique angle β is 35 degree～55 degree in these second group of grooving, 25 each groovings, so that the light that passes through is penetrated with certain rising angle by the total reflection mode, can avoid the loss of wide-angle light.

In addition, this first and second group grooving 24,25 mode of arranging that can continue is arranged on the exiting surface 22 and bottom surface 23 of LGP 20, as shown in Figure 4; Also can be as shown in Figure 5, have spacing between each grooving, and the formula variation in gradient of this spacing, and light source 30 can be right against the grooving setting with spacing maximum.

During concrete enforcement, the backlight modular structure of this liquid crystal indicator as shown in Figure 6, by LGP 20, be located at the light source 30 of LGP 20 plate edge positions, be located at the reflection diaphragm 13 of LGP 20 belows, and the last diffusion sheet of being located between LGP 20 and the liquid crystal panel 17 16 constitutes, the light of its light source 30 enters LGP 20 by LGP 20 incidence surfaces 21, part light is evenly penetrated to exiting surface 22 by second group of grooving 25 of bottom surface 23, part light is then penetrated by first group of grooving 24 of exiting surface 22, and by the angular dimension at the drift angle or first oblique angle, the light that passes through is penetrated with certain rising angle by the total reflection mode, can avoid the loss of wide-angle light, and special angle design via the drift angle or first oblique angle, can improve light utilization efficiency, and can save prismatic lens and the setting of diffusion sheet down, to reach the design of slimming.

As mentioned above, the utility model provides the side light type back light module frame another preferable feasible light conducting plate structure, so offer the application of novel patent in accordance with the law; Yet, above implementation and graphic shown in, be the utility model preferred embodiment, be not to limit to the utility model with this, be with, approximate with structure of the present utility model, device, feature etc. such as, identical person all should belong to of the present utility model founding within purpose and the claim.

Claims

1. LGP and liquid crystal indicator, its LGP include an incidence surface, one and this incidence surface bottom surface of intersecting at least, and an exiting surface relative with this bottom surface, and light source is arranged at a side that should incidence surface; It is characterized in that:

This exiting surface and bottom surface are respectively equipped with first and second group grooving, the cross section of its first and second group grooving each grooving has a drift angle, one first oblique angle and second oblique angle, the span of drift angle is 120 degree～150 degree in this first group of each grooving of grooving, and the span at first oblique angle is 35 degree～55 degree in this second group of each grooving of grooving.

2. LGP and liquid crystal indicator according to claim 1 is characterized in that this grooving is the structure of V-groove.

3. LGP and liquid crystal indicator according to claim 1 is characterized in that, each grooving is provided with in the mode of arranging that continues.

4. LGP and liquid crystal indicator according to claim 1 is characterized in that having spacing between each grooving.

5. as LGP and liquid crystal indicator as described in the claim 4, it is characterized in that, change apart from formula in gradient between each grooving, and light source is right against the grooving setting with spacing maximum.

6. LGP and liquid crystal indicator according to claim 1 is characterized in that this light source is a spot light.

7. LGP and liquid crystal indicator according to claim 1, it is characterized in that this LGP is located in the liquid crystal indicator, this light source is arranged at a side of LGP incidence surface, and the LGP below is provided with a reflector plate, and this LGP top is provided with diffusion sheet and liquid crystal panel in regular turn.