CN211878221U

CN211878221U - Backlight type light guide plate with holes

Info

Publication number: CN211878221U
Application number: CN202020297686.6U
Authority: CN
Inventors: 王庆芳; 刘育维
Original assignee: Zhejiang Chenheng Technology Co ltd
Current assignee: Zhejiang Chenheng Technology Co ltd
Priority date: 2020-03-11
Filing date: 2020-03-11
Publication date: 2020-11-06
Anticipated expiration: 2030-03-11

Abstract

A backlight type light guide plate with holes comprises a mounting plate, a plurality of LED lamps arranged on the mounting plate at intervals, a universal light guide plate positioned above the mounting plate and the LED lamps, a regular brightness enhancement film positioned above the universal light guide plate and a reflection-type polarizer positioned above the regular brightness enhancement film; a through hole is formed in the universal light guide plate corresponding to each LED lamp, and at least part of the through hole is filled with an optical particle mixture formed by uniformly mixing fluorescent particles and diffusion particles. Thus reducing the layered structure, thickness and cost.

Description

Backlight type light guide plate with holes

Technical Field

The utility model relates to an electronic display device's light guide plate technical field, especially a foraminiferous backlight formula light guide plate.

Background

Referring to fig. 1, the conventional direct-backlight light guide plate includes, from bottom to top, a diffuser plate (diffuser plate)4, a prism film (BEF)5, a regular brightness enhancement film (BEF II)6, and a reflective polarizer (DBEF) 7. A plurality of LED lamps 2 are arranged on the mounting plate 1, a light splitting lens 3 is arranged above the LED lamps 2, and the scattering plate 4 is positioned above the light splitting lens 3. The light splitting effect and the optical color rendering of the structure depend on the light splitting lens 3 and the scattering plate 4, the whole thickness is thick, and the cost is high.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a back light type light guide plate with holes, which reduces the number of layers and the thickness and cost, to solve the above problems.

A backlight type light guide plate with holes comprises a mounting plate, a plurality of LED lamps arranged on the mounting plate at intervals, a universal light guide plate positioned above the mounting plate and the LED lamps, a regular brightness enhancement film positioned above the universal light guide plate and a reflection-type polarizer positioned above the regular brightness enhancement film; a through hole is formed in the universal light guide plate corresponding to each LED lamp, and at least part of the through hole is filled with an optical particle mixture formed by uniformly mixing fluorescent particles and diffusion particles.

Further, a light-transmitting plate is arranged above the universal light guide plate and covers all the through holes.

Further, the light-transmitting plate is connected with the top surface of the general light guide plate through an adhesive.

Further, a prism film is arranged between the regular brightness enhancement film and the universal light guide plate.

Further, each LED lamp is located in a corresponding through hole in the universal light guide plate, and the optical particle mixture is located in the through hole and above the LED lamp.

Further, the depth of the LED lamp extending into the through hole is less than or equal to 1/3 of the length of the through hole.

Furthermore, the optical particle mixture contains viscose, and the optical particle mixture is dried in the through hole and then fixed and molded.

Further, the mounting plate is a circuit board.

Compared with the prior art, the utility model discloses a foraminiferous backlight formula light guide plate includes mounting panel, a plurality of LED lamps that set up on the mounting panel at intervals, the general type light guide plate that is located mounting panel and LED lamp top, the regular type membrane of adding lustre to that is located general type light guide plate top and the reflection-type polaroid that is located the regular type membrane of adding lustre to top; a through hole is formed in the universal light guide plate corresponding to each LED lamp, and at least part of the through hole is filled with an optical particle mixture formed by uniformly mixing fluorescent particles and diffusion particles. Thus reducing the layered structure, thickness and cost.

Drawings

Embodiments of the present invention are described below with reference to the accompanying drawings, in which:

fig. 1 is a schematic side view of a conventional direct-backlight light guide plate.

Fig. 2 is a schematic side view of a first embodiment of a back light type light guide plate with holes according to the present invention.

Fig. 3 is a schematic side view of a back light type light guide plate with holes according to a second embodiment of the present invention.

Detailed Description

The following describes in further detail specific embodiments of the present invention based on the drawings. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.

Referring to fig. 2, the structure of the first embodiment of the light guide plate with holes in a backlight according to the present invention includes a mounting plate 10, a plurality of LED lamps 20 disposed on the mounting plate 10 at intervals, a General Light Guide Plate (GLGP)30 located above the mounting plate 10 and the LED lamps 20, a regular brightness enhancement film (BEF II)40 located above the general light guide plate 30, and a reflective polarizer (DBEF)50 located above the regular brightness enhancement film 40.

The top surface of the mounting plate 20 is provided with a reflective layer to reflect light, and the mounting plate 10 may be a circuit board.

The general light guide plate 30 is provided with a through hole 31 corresponding to each LED lamp 20, the through hole 31 is filled with an optical particle mixture formed by uniformly mixing fluorescent particles and diffusion particles, light emitted by the LED lamp 20 penetrates through the optical particle mixture, and the optical particle mixture has a light splitting effect on light and improves optical color rendering performance. Color rendering is an evaluation of the quality of the visual effect of a color that appears when a light source illuminates an object. The numerical value of the evaluation is based on the color index seen under reference light, the color reflected by the object under the irradiation of the full-color spectrum is the truest, and sunlight is an equal-proportion full-color light source with the best color rendering property.

In this embodiment, the optical particle mixture is mixed with viscose to form a gel, and the gel is filled in the through hole 31, dried, and then fixed and molded.

The weight ratio of the fluorescent particles to the diffusing particles was 1: 1.

Therefore, a beam splitting lens and a scattering plate are omitted, the layered structure is reduced, and the thickness and the cost are reduced.

Further, a transparent plate 32 is disposed above the general-purpose light guide plate 30, and the transparent plate 32 covers all the through holes 31. The light-transmitting plate 32 serves to confine and protect the mixture of optical particles and to keep the upper surface of the mixture of optical particles flush. The light-transmitting plate 32 is attached to the top surface of the general-purpose light guide plate 30 by adhesive.

Referring to fig. 2, in a second embodiment of the light guide plate with holes according to the present invention, compared to the first embodiment, each LED lamp 20 is located in the corresponding through hole 31, and an optical particle mixture formed by uniformly mixing fluorescent particles and diffusing particles is filled in the through hole 31 above the LED lamp 20, light emitted from the LED lamp 20 penetrates through the optical particle mixture, and the optical particle mixture has a light splitting effect on light and provides an optical color rendering performance. This further reduces the overall thickness.

The depth of the LED lamp 20 extending into the through hole 31 is less than or equal to 1/3 of the length of the through hole 31.

A prism film (BEF)60 may be provided below the regular brightness enhancement film 40. The surface of the prism film 60 is a micro-prism structure having a height of about 20 μm. The light emitted from below is divergent light which is uniform in all directions. The prism film 60 gathers part of the light rays to be emitted within the range of about 70 degrees, and the other part of the light rays are reflected by the micro-prism structure and are recycled through the reflection action of the mounting plate 10, so that the light rays are emitted within the range of about 70 degrees finally. Thus, the brightness of the front view is increased, and the visual angle is reduced.

The reflection type polarizer (DBEF)50 operates on the principle that the brightness is further improved based on the above, and the light vector of the fully polarized light emitted from the backlight is resolved into two vibration directions P and S perpendicular to each other. For a conventional absorption polarizer, light (assumed to be P light) passing through one vibration direction is selected and light (assumed to be S light) perpendicular to the vibration direction is totally absorbed, so that light energy is absorbed and more than 50% is lost when passing through a polarizer under an LCD. The P light of the reflective polarizer can directly pass through the DBEF, but most of the S light is reflected by the DBEF to the backlight, and after passing through materials of each layer of the backlight, the S light is depolarized, becomes fully polarized light (P light + S light), and re-exits the backlight to be recycled. Therefore, the DBEF increases brightness by using 50% of light originally absorbed by the conventional absorptive polarizer, and is an increase in full viewing angle and omnidirection. Compared with the mode of brightening by a prism film (BEF), DBEF has no influence on the viewing angle while brightening.

The regular brightness enhancement film (BEF II)40 is a prism film having a regular shape. The prism film (BEF)60 is used in cooperation with the regular brightness enhancement film (BEF II)40, which can further improve the light utilization rate and increase the brightness.

Compared with the prior art, the utility model discloses a foraminiferous backlight formula light guide plate includes mounting panel 10, a plurality of interval sets up LED lamp 20 on mounting panel 10, be located mounting panel 10 and LED lamp 20 overhead general type light guide plate 30, be located the regular form membrane of adding lustre to 40 of general type light guide plate 30 and be located the reflection-type polaroid 50 of regular form membrane of adding lustre to 40; the general light guide plate 30 is provided with a through hole 31 corresponding to each LED lamp 20, and the through hole 31 is filled with an optical particle mixture formed by uniformly mixing fluorescent particles and diffusion particles. Thus reducing the layered structure, thickness and cost.

The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention, and any modification, equivalent replacement or improvement within the spirit of the present invention is encompassed by the claims of the present invention.

Claims

1. The utility model provides a foraminiferous backlight formula light guide plate which characterized in that: the LED light source comprises a mounting plate, a plurality of LED lamps arranged on the mounting plate at intervals, a universal light guide plate positioned above the mounting plate and the LED lamps, a regular brightness enhancement film positioned above the universal light guide plate and a reflection-type polarizer positioned above the regular brightness enhancement film; a through hole is formed in the universal light guide plate corresponding to each LED lamp, and at least part of the through hole is filled with an optical particle mixture formed by uniformly mixing fluorescent particles and diffusion particles.

2. The apertured backlight as defined in claim 1, wherein: and a light-transmitting plate is arranged above the universal light guide plate and covers all the through holes.

3. The perforated backlight light guide plate of claim 2, wherein: the light-transmitting plate is connected with the top surface of the universal light guide plate through an adhesive.

4. The apertured backlight as defined in claim 1, wherein: and a prism film is also arranged between the regular brightness enhancement film and the universal light guide plate.

5. The apertured backlight as defined in claim 1, wherein: each LED lamp is positioned in a corresponding through hole on the universal light guide plate, and the optical particle mixture is positioned in the through holes and above the LED lamps.

6. The perforated backlight light guide plate of claim 5, wherein: the depth of the LED lamp extending into the through hole is less than or equal to 1/3 of the length of the through hole.

7. The apertured backlight as defined in claim 1, wherein: the optical particle mixture contains viscose, and the optical particle mixture is dried in the through hole and then fixed and molded.

8. The apertured backlight as defined in claim 1, wherein: the mounting plate is a circuit board.