WO2020155808A1

WO2020155808A1 - Edge-type backlight module, liquid crystal display apparatus and backlight plate optical inspection method

Info

Publication number: WO2020155808A1
Application number: PCT/CN2019/120395
Authority: WO
Inventors: 吕强强; 孙树峰; 王萍萍; 邵晶; 刘庆玉; 王津; 王永武; 王德祥
Original assignee: 青岛理工大学
Priority date: 2019-01-28
Filing date: 2019-11-22
Publication date: 2020-08-06
Also published as: KR102644340B1; KR20210132037A; JP7276785B2; CN109683395A; JP2022523300A

Abstract

Disclosed are an edge-type backlight module, a liquid crystal display apparatus and a backlight plate optical inspection method. The backlight module comprises a backlight plate main body, wherein the backlight plate main body comprises a first substrate (1) for bearing a light guide plate to be inspected and a second substrate (2) detachably connected to the first substrate (1), a light source moving module is arranged on the second substrate (2), and a light source (4) is mounted on the light source moving module. The light source moving module is used to drive the light source (4) to move in a direction perpendicular to the light source, so that the distance between the light source (4) and the light guide plate is adjusted, and the phenomenon of an optical index not meeting standards caused by the problem of the distance between a light incident side of the light guide plate and the light source is prevented, namely, the misjudgment probability of determining whether the light guide plate meets standards is reduced; in this process, there is no need to touch and move the light guide plate, thereby preventing the staining, damage and scratching of the light guide plate, so that loss is reduced and the cost is economized; and the backlight plate main body is not an integral structure, thereby facilitating transportation.

Description

Side-entry backlight module, liquid crystal display device, and optical inspection method of backlight plate

Technical field

The present disclosure belongs to the field of optical inspection of light guide plates, and in particular relates to a side-entry backlight module for inspecting light guide plate optics with adjustable light bar distance, a liquid crystal display device using the backlight module, and a backlight using the side-entry backlight module Optical inspection method of plate.

Background technique

The rapid development of my country's liquid crystal display industry has driven the development of many enterprises that produce liquid crystal backlight module components. The backlight module is divided into side-type backlight and direct-type backlight. The present disclosure is directed to a backlight module with an edge-type backlight.

The main part of the backlight module of the edge type backlight is a light guide plate. The light guide plate needs to be optically inspected after ink printing or laser dotting. Optical inspection usually involves placing the light guide plate after ink printing or laser dotting on a simple backlight module and using BM-7 for optical inspection. However, the inventor found in the research that the positioning slot of the light guide plate and the positioning post of the backlight module are usually clearance fit (for ease of assembly, it is impossible to design an interference fit), which leads to the placement of the light guide plate on the backlight module When it is installed, the light incident side cannot be accurately close to the light bar of the backlight module, and there will be a certain distance between them. In addition, due to long-term use, the positioning column will become loose, which will also cause the light incident side to not accurately approach the light bar. However, the inventor found through a large number of simulation experiments and actual measurements that the distance between the light bar and the light entrance side of the light guide plate is very important. A larger distance between the light bar and the light guide plate will reduce the optical detection value of the light guide plate by 300-500nit ( BM-7 optical unit). This is fatal to the light guide plate. It is very likely that a product that was originally qualified will be unqualified due to the distance of the light bar. The price of a light guide plate ranges from 50-1500 yuan, which is a great loss. In addition, experienced staff will deliberately push the light guide plate toward the light bar when inspecting the light guide plate to reduce the distance between the light bar and the light entrance side of the light guide plate. Although this can increase the optical detection value of the light guide plate, it cannot Avoid touching the moving light guide plate, causing stains and scratches on the light guide plate, especially the light guide plate of 86 inches (1.9m*1.2m) or larger, which is difficult to move at all. The above-mentioned problems will cause losses to the enterprise.

Summary of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the present disclosure provides an edge-lit backlight module for inspecting light guide plate optics with adjustable light bar distance, and a liquid crystal display device using the backlight module and an edge-lit backlight module Optical inspection method of the backlight plate.

The technical solutions adopted in this disclosure are:

An edge-type backlight module, the backlight module includes a backlight plate main body, the backlight plate main body includes a first substrate for carrying a light guide plate to be tested and a second substrate detachably connected to the first substrate, the A light source moving module is provided on the second substrate, and a light source is installed on the light source moving module.

Through the above technical solution, the light source moving module is used to drive the light source to move in a direction perpendicular to it, thereby adjusting the distance between the light source and the light guide plate, avoiding touching the moving light guide plate, causing no stains and scratches on the light guide plate, and reducing loss. The cost is saved, and the main body of the backlight board is not an integral structure, which is convenient for transportation.

Further, the light source moving module includes a light source support frame, two symmetrically arranged L-shaped levers for driving the light source support frame to move up and down, and a rotating device for driving the L-shaped lever to perform fan-shaped movement.

Further, the light source support frame includes a transverse support rod and two vertical guide rods perpendicular to the transverse support rod, the light source is mounted on the transverse support rod, and two symmetrical support rods are provided below the transverse support rod to communicate with L The U-shaped guide pieces matched with the shaped shift levers, and two side walls of each guide piece are respectively provided with long through holes along the transverse direction.

Further, a U-shaped stopper for restricting the movement position of the vertical guide rod is provided at a position on the second substrate corresponding to the vertical guide rod, and the vertical guide rod is located between the U-shaped stopper and the second substrate. Between the formation of the cavity.

Through the above technical solution, the U-shaped stopper is used to limit the moving direction and position of the light source support frame, so that the light source support frame moves in a direction perpendicular to it, and then drives the light source to move in the direction perpendicular to the light source support frame, and adjust the light source The distance from the light entrance side of the light guide plate can greatly reduce the probability of misjudgment, dirt, and scratches of the light guide plate, and reduce the cost, because sometimes the finished light guide plate is qualified, but it is because the light guide plate is inspecting At this time, due to the improper distance between the light entrance side and the light bar, the optical detection value of the light guide plate is low, resulting in misjudgment of the finished light guide plate. The present disclosure uses the light source moving module to drive the light source to move in a direction perpendicular to it, thereby adjusting the light source and the light guide. The distance from the light entrance side of the light guide plate greatly reduces the probability of misjudgment of whether the light guide plate is qualified or not.

Further, a rotating shaft is provided at a position corresponding to the L-shaped shift lever on the second substrate, and the connection between the horizontal section and the vertical section of the L-shaped shift lever is provided on the rotating shaft on the second substrate.

Through the above technical solution, the use of the rotating shaft facilitates fan-shaped movement of the L-shaped lever, and ensures that the L-shaped lever can rotate around the rotating shaft.

Further, one end of the horizontal section of the L-shaped shift lever is provided with a protrusion that cooperates with the U-shaped guide, and the horizontal section of the L-shaped shift lever is located in the through hole of the U-shaped guide.

Through the above technical solutions, the protrusions are matched with the U-shaped guides. When the L-shaped lever makes a fan-shaped movement, the light source support frame is raised or lowered through the cooperation of the protrusions and the guides to achieve the adjustment of the distance between the light source and the light guide plate. purpose.

Further, the rotating device includes a turntable and a knob, and both sides of the turntable are respectively connected to one end of the vertical section of the L-shaped lever through a connecting rod;

The knob is installed on the back side of the second substrate and is connected to the turntable through a shaft.

Through the above technical solution, the rotation of the knob on the back of the second substrate is used to drive the turntable to rotate. The turntable drives the L-shaped lever through the connecting rod to rotate in a fan shape, so as to facilitate the lifting or lowering of the light source support frame, and the light source support frame drives the light source to move , To achieve the purpose of adjusting the distance between the light source and the light guide plate.

Further, it also includes a light-shielding module. The light-shielding module includes a cover plate arranged on the outer side of the light source moving module and a light-shielding plate arranged on the cover plate. Both ends of the cover plate are fixedly connected to the second substrate. The two sides of the board are clamped and fixed on the cover by edge strips.

Through the above technical solution, the light shielding plate is used to prevent the light emitted by the light source from overflowing, and the cover plate is used to prevent the light source moving module from falling off the second substrate.

A liquid crystal display device includes the above-mentioned edge-type backlight module and a light guide plate, the light guide plate is fixed on the body of the backlight plate and arranged opposite to the light source.

An optical inspection method for a light guide plate, which is implemented based on the above-mentioned edge-type backlight module, and includes the following steps:

Fix the light guide plate to be inspected on the first substrate;

Rotate the knob clockwise, the knob drives the turntable to rotate;

The turntable drives the two L-shaped levers to perform fan-shaped movement around the shaft through two connecting rods;

The protrusions of the two L-shaped levers swing in a fan shape, and simultaneously lift the light source support frame;

The light source support frame drives the light source to move upward, making the light source close to the light entrance side of the light guide plate;

The light guide plate is optically inspected with a backlight module optical measuring instrument to obtain the optical detection value of the light guide plate.

Through the above technical solutions, the beneficial effects of the present disclosure are:

(1) The present disclosure adopts the light source moving module to drive the light source to move in a direction perpendicular to it, thereby adjusting the distance between the light source and the light guide plate, avoiding touching the moving light guide plate, causing no stains and scratches on the light guide plate, and reducing loss. Cost savings;

(2) The main body of the present disclosure is not an integral structure, but is composed of two detachably connected base plates, which is convenient for transportation; and the two base plates are aluminum base plates, which is convenient for heat dissipation and does not cause bending and deformation of the plates;

(3) The present disclosure uses the rotation of the knob on the back of the second substrate to drive the turntable to rotate. The turntable drives the L-shaped lever through the connecting rod to make a fan-shaped rotation, so as to facilitate the lifting or lowering of the light source support frame, and the light source support frame drives the light source to move , To achieve the purpose of adjusting the distance between the light source and the light guide plate, which can greatly reduce the probability of misjudgment, dirt, and scratches on the qualified light guide plate, and reduce the cost.

Description of the drawings

The accompanying drawings of the specification constituting a part of the present disclosure are used to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions of the present disclosure are used to explain the present application, and do not constitute an improper limitation of the present disclosure.

FIG. 1 is a schematic diagram of the overall structure of the side-lit backlight module of this embodiment;

2 is a schematic diagram of the structure without a cover of the side-lit backlight module of this embodiment;

Fig. 3 is a partial enlarged schematic diagram of a light source and a light source support frame of this embodiment;

4 is a schematic diagram of the structure of a light source support frame in this embodiment;

Fig. 5 is a structural schematic diagram 1 of a light source moving module of this embodiment;

Fig. 6 is a second structural diagram of a light source moving module of the first embodiment;

FIG. 7 is a partial enlarged schematic diagram of a shading module of this embodiment;

Fig. 8 is a schematic structural diagram of a knob of this embodiment.

detailed description

The disclosure will be further described below in conjunction with the drawings and embodiments.

It should be pointed out that the following detailed descriptions are all illustrative and are intended to provide further descriptions of the present disclosure. Unless otherwise specified, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs.

It should be noted that the terms used here are only for describing specific implementations, and are not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "including" are used in this specification, they indicate There are features, steps, operations, devices, components, and/or combinations thereof.

Example one

The first embodiment provides a side-lit backlight module. The side-lit backlight module includes a backlight plate main body, a light source, a light source moving module and a light shielding module.

Referring to Figure 1, the backlight main body includes a first substrate 1 and a second substrate 2 for fixing and carrying the light guide plate to be inspected. The first substrate 1 and the second substrate 2 are detachably connected to form a backlight. Other components of the module, such as the light source, the light source moving module and the accommodating space of the shading module; the first substrate 1 and the second substrate 2 that are detachably connected are not an integral structure, and can be placed separately during transportation for convenient transportation.

2 and 3, the light source moving module is arranged on the front side of the second substrate 2. The light source moving module includes a light source support frame 5, a turntable 6, a connecting rod 7, an L-shaped lever 8, and a rotating shaft 10. And the knob 14, the light source 4 is arranged on the light source support frame 5.

Referring to FIG. 4, the light source support frame 5 includes a horizontal support rod 51 and two vertical guide rods 52 that are vertical and horizontal support rods. The light source 4 is arranged on the horizontal support rod 51 for carrying the light source 4; There are also two U-shaped guides 53 arranged symmetrically below the transverse support rod 51. The top sides of the two guides 53 are fixedly connected to the bottom of the transverse support rod 51, and the two guides 53 are located at Between the two vertical support rods 52, the two side walls of each guide 53 are respectively provided with elongated through holes 54 in the transverse direction, which are used to cooperate with the protrusions of the L-shaped lever to transmit movement; An L-shaped lever 8 is respectively provided in each connecting piece 53.

Referring to FIG. 5, a rotating shaft 10 is provided at a position corresponding to the L-shaped shift lever 8 on the second substrate, and the connection between the horizontal section 81 and the vertical section 82 of the L-shaped shift lever 8 is set in the second On the rotating shaft 10 on the base plate, the L-shaped shift lever 8 can perform fan-shaped movement around the rotating shaft 10. The horizontal section 81 of the L-shaped shift lever 8 is located in the U-shaped connector 53, and the horizontal section of the L-shaped shift lever 8 The end of 81 away from the vertical section is symmetrically provided with two protrusions 83. The protrusions 83 are located in the through holes 54 on the two side walls of the U-shaped connecting member 53 and can slide in the passage 54 to act as an L-shaped dial. When the rod moves in a fan shape around the rotating shaft 10, the protrusion 83 can raise or lower the light source support frame 5, so that the light source 4 can move in a direction perpendicular to the light source support frame 5, and adjust the distance between the light source and the light entrance side of the light guide plate assembly. Greatly reduce the probability of misjudgment, dirt, and scratches on whether the light guide plate is qualified or not, and reduce costs.

Referring to FIG. 6, the two sides of the turntable 6 are respectively provided with through holes, and each through hole on the turntable is respectively connected to the end of the vertical section 82 of the L-shaped lever 8 away from the horizontal end through a connecting rod 8 for The connecting rod drives the L-shaped lever to rotate.

Referring to FIG. 7, the shading module includes a cover 13 and a shading plate 11. The cover 13 is arranged on the outside of the light source moving module and is fixedly installed on the second substrate 2 to prevent the light source from moving the module It is removed from the second substrate 2 to prevent the light from overflowing at the light source and to prevent the detection of the light guide plate. It is also used to carry the light shielding plate 11; the light shielding plate 11 is arranged on the cover plate 13, and the light shielding plate 11 The two sides of the light shield are clamped and fixed on the cover plate 13 by the side strips 13, so that the shading plate is fixed on the cover plate and is not easy to fall off and prevents the light emitted by the light source from overflowing.

Referring to FIG. 7, the knob 14 is installed on the back side of the second base plate 2. The knob 14 is connected to the turntable through a shaft. When the knob 14 rotates, the turntable 6 rotates, and the connecting rod 7 drives the L-shaped The shift lever performs fan-shaped movement around the rotating shaft 10, and the protrusion 83 of the L-shaped shift lever lifts or lowers the light source support frame 5, so that the light source 4 moves in a direction perpendicular to the light source support frame 5, and adjusts the light source and the first substrate and the second substrate The distance of the light source can be close to the light incident side of the light guide plate.

When the side-type backlight module proposed in this embodiment is used, the light guide plate to be inspected is fixedly installed on the first substrate through a plurality of positioning pins 3, and the knob 14 is rotated clockwise to drive the turntable 6 to rotate, which is driven by the connecting rod 7. The L-shaped lever moves in a fan shape around the shaft 10, and the protrusion 83 of the L-shaped lever lifts the light source support frame 5 to move the light source 4 in a direction perpendicular to the light source support frame 5, making the light source close to the light entrance side of the light guide plate .

The side-entry backlight module proposed in this embodiment drives the turntable 6 to rotate by turning the knob 14 on the back side of the second substrate. The turntable 6 and the L-shaped lever 8 are connected by the connecting rod 7. When the turntable 6 rotates, the L-shaped The shift lever 8 also performs a fan-shaped motion accordingly, and the protrusions on the L-shaped shift lever 8 swing in a fan-shaped manner, thereby driving the upward or downward movement of the light source support frame 5, and finally the light source 4 moves upward or downward. This embodiment The rotary movement of the knob is transformed into the linear movement of the light source, and the light source is adjusted to be close to the light incident side of the light guide plate.

It should be noted that the above-mentioned first substrate 1 adopts an aluminum substrate for supporting and fixing the light guide plate to be inspected, and the above-mentioned second substrate 2 also adopts an aluminum substrate for carrying the light guide plate and can dissipate heat well. A large amount of heat is generated during light emission, and if it is not dissipated, it will cause bending and deformation of the plate. Therefore, in this embodiment, the first substrate 1 and the second substrate are respectively aluminum substrates, which can dissipate heat well.

The above-mentioned first substrate 1 and second substrate 2 can be connected together by bolts. When transportation is required, the bolts can be removed to disassemble the first substrate 1 and the second substrate 2 for convenient transportation.

It should be noted that in this embodiment, the light source 4 adopts an LED light bar as the light source of the entire backlight module. The light bar is fixedly arranged on the light source support frame 5. When the L-shaped lever 8 is fan-shaped around the shaft 10 When moving, the protrusion 83 of the L-shaped lever 8 can lift or lower the light source support frame 5, so that the light bar moves in a direction perpendicular to the light source support frame 5, and adjusts the distance between the light bar and the light entrance side of the light guide plate assembly. Greatly reduce the probability of misjudgment, contamination and scratches of the light guide plate, reduce losses and reduce costs.

Referring to FIG. 5, the position on the second substrate proposed in this embodiment corresponding to the vertical guide rod 52 of the light source support frame 5 is provided with a U-shaped stopper 9 for restricting the moving position of the vertical guide rod 52 for limiting The position where the light source support frame 5 moves downward. In this embodiment, the U-shaped limiting member 9 is mounted on the second aluminum substrate 3 by screws, a cavity is formed between the U-shaped limiting member 9 and the second aluminum substrate 3, and the light source support frame 5 The vertical guide rod 52 is located in the cavity, and the vertical guide rod 52 can move along the direction specified by the U-shaped stop 9.

Example two

This embodiment provides a liquid crystal display device. The liquid crystal display device includes a light guide plate and the above-mentioned side-lit backlight module. The light guide plate is fixed on the first substrate 1 and arranged opposite to the light source 4.

For the specific structure of the edge-lit backlight module of this embodiment, please refer to the related description of the previous embodiment, and will not be repeated here.

It should be noted that, in this embodiment, the light guide plate is fixedly mounted on the first substrate by a plurality of positioning pins 3, and this embodiment uses a plurality of positioning pins 3 to fix the light guide plate on the first substrate, and the positioning pins 1 It cooperates with the slot of the light guide plate to ensure that the light guide plate will not shake on the first substrate.

Example three

This embodiment provides an optical inspection method for a light guide plate, which is implemented based on the above edge-lit backlight module, and the method includes the following steps:

S101, fixing the light guide plate to be inspected on the first substrate through a plurality of positioning pins;

S102, rotate the knob clockwise, the knob drives the turntable 6 to rotate;

S103, the turntable drives the two L-shaped levers 8 to perform fan-shaped movement around the rotating shaft 10 through the two connecting rods 7;

S104, the protrusions 83 of the two L-shaped levers swing in a fan shape, and simultaneously lift the light source support frame 5;

S105: The light source support frame 5 drives the light source 4 to move upward in a direction perpendicular to the light source support frame 5, so that the light source is close to the light incident side of the light guide plate;

S106, optically inspect the light guide plate using the backlight module optical measuring instrument BM-7 to obtain the optical detection value of the light guide plate.

Specifically, in the step 106, the optical inspection of the light guide plate is implemented by adopting the following scheme:

When the light source is close to the light guide plate, cover the composite film, which mainly includes some optical film such as prism film and diffusion film;

Put the observation lens of the backlight module optical measuring instrument BM-7 on the position after the composite film is covered, and analyze and record the optical data detected by the BM-7 instrument. There is no obvious appearance defect (such as scratches) on the light guide plate. , Stains), these optical data are qualified if they meet the standard, otherwise it is a defective product.

The optical inspection method of the light guide plate proposed in this embodiment drives the turntable 6 to rotate by rotating the knob 14 on the back side of the second substrate. The turntable 6 and the L-shaped lever 8 are connected by the connecting rod 7. When the turntable 6 rotates, the L-shaped dial The rod 8 also performs a fan-shaped movement, and the protrusion on the L-shaped lever 8 swings in a fan-shaped manner, thereby driving the upward or downward movement on the light source support frame 5, and finally the light source 4 moves upward or downward. This embodiment passes The rotary motion of the knob is transformed into the linear motion of the light source. The light source is adjusted close to the light entrance side of the light guide plate, and then the backlight module optical measurement system BM-7 performs optical inspection on the light guide plate to provide the optical detection value accuracy of the light guide plate.

Industrial applicability

The backlight module of the present disclosure can be suitable for the purpose of detecting whether the optical index of the light guide plate is qualified when the light guide plate manufacturer is producing the laser dotted light guide plate or the ink printed light guide plate.

Although the specific embodiments of the present disclosure are described above in conjunction with the accompanying drawings, they do not limit the scope of protection of the present disclosure. Those skilled in the art should understand that on the basis of the technical solutions of the present disclosure, those skilled in the art do not need to make creative efforts. Various modifications or variations that can be made are still within the protection scope of the present disclosure.

Claims

An edge-type backlight module is characterized in that it comprises a backlight plate main body which comprises a first substrate for carrying a light guide plate to be inspected and a second substrate detachably connected to the first substrate. A light source moving module is provided on the second substrate, and a light source is installed on the light source moving module.
The side-lit backlight module according to claim 1, wherein the light source moving module includes a light source support frame, two symmetrically arranged L-shaped levers for driving the light source support frame to move up and down, and L-shaped lever is a rotating device for fan-shaped movement.
The side-lit backlight module according to claim 2, wherein the light source support frame comprises a horizontal support rod and two vertical guide rods that are vertical and horizontal support rods, and the light source is installed on the horizontal support rod, Two U-shaped guides for matching with the L-shaped shift lever are symmetrically arranged under the transverse support rod, and two side walls of each guide are respectively provided with elongated through holes along the transverse direction.
The edge-lit backlight module according to claim 3, wherein a U-shaped stopper is provided at a position corresponding to the vertical guide rod on the second substrate to limit the moving position of the vertical guide rod, and The vertical guide rod is located in the cavity formed between the U-shaped limiting member and the second substrate.
The side-lit backlight module according to claim 2, wherein a rotating shaft is provided at a position corresponding to the L-shaped lever on the second substrate, and the horizontal section and the vertical section of the L-shaped lever are The connection point is set on the rotating shaft on the second substrate.
The edge-type backlight module according to claim 5, wherein one end of the horizontal section of the L-shaped lever is provided with a protrusion that matches with the U-shaped guide, and the horizontal section of the L-shaped lever is The upper protrusion is located in the through hole of the U-shaped guide.
The side-lit backlight module according to claim 2, wherein the rotating device comprises a turntable and a knob, and two sides of the turntable are respectively connected to one end of the vertical section of the L-shaped lever through a connecting rod;

The knob is installed on the back side of the second substrate and is connected to the turntable through a shaft.
The edge-lit backlight module according to claim 1, further comprising a shading module, the shading module comprising a cover plate arranged on the outside of the light source moving module and a shading plate arranged on the cover plate, the Both ends of the cover plate are fixedly connected with the second substrate, and both sides of the light shielding plate are clamped and fixed on the cover plate by edge strips.
A liquid crystal display device, which is characterized by comprising the edge-lit backlight module and a light guide plate according to any one of claims 1-8, and the light guide plate is fixed on the main body of the backlight plate and arranged opposite to the light source.
An optical inspection method for a light guide plate, which is implemented based on the edge-lit backlight module of any one of claims 1-8, characterized in that the method includes the following steps:

Fix the light guide plate to be inspected on the first substrate;

Rotate the knob clockwise, the knob drives the turntable to rotate;

The turntable drives the two L-shaped levers to perform fan-shaped movement around the shaft through two connecting rods;

The protrusions of the two L-shaped levers swing in a fan shape, and simultaneously lift the light source support frame;

The light source support frame drives the light source to move upward, making the light source close to the light entrance side of the light guide plate;

The light guide plate is optically inspected with a backlight module optical measuring instrument to obtain the optical detection value of the light guide plate.