JP7276785B2 - Edge-type backlight module, liquid crystal display device, and optical inspection method for backlight - Google Patents

Description

The present invention belongs to the field of optical inspection of a light guide plate, and more specifically, an edge-type backlight module capable of adjusting the distance of a light bar for optical inspection of a light guide plate, a liquid crystal display device employing the backlight module, and The present invention relates to an optical inspection method for a backlight panel that employs an edge type backlight module.

The rapid development of the liquid crystal display industry in our country has encouraged the development of many enterprises that produce liquid crystal backlight module components. Backlight modules are classified into edge-type backlights and direct-type backlights, and the present disclosure is directed to backlight modules of edge-type backlights.

The main body member of the backlight module of the edge type backlight is the light guide plate. After the light guide plate is printed with ink or processed with laser dots, it needs to be optically inspected. It is placed in a light module and optically inspected using BM-7. However, as a result of research by the inventors, the positioning lock groove of the light guide plate and the positioning post of the backlight module are generally loose fit (in order to facilitate assembly, it is not necessary to design them as a tight fit). possible), when the light guide plate is placed in the backlight module, its light incident side cannot be accurately brought close to the light bar of the backlight module, but is separated by a certain distance; Long-term use loosens the locating posts, again making it impossible to accurately bring the light input side closer to the light bar. However, the inventors have found from numerous simulation experiments and actual measurements that the distance between the light bar and the light incident side of the light guide plate is very important, and even if the distance between the light bar and the light guide plate is slightly increased, We found that the optical detection value of the light guide plate decreased by 300-500 nits (optical units in BM-7). This is fatal for the light guide plate, and the distance from the light bar may cause the product to fail the inspection, even though it should have passed. The selling price of a single light guide plate varies from 50 to 1500 yuan, which is a big loss. In addition, when inspecting the light guide plate, experienced workers will intentionally push the light guide plate toward the light bar to reduce the distance between the light bar and the light entrance side of the light guide plate, so that the optical Although it can improve the target detection value, this requires touching and moving the light guide plate, which causes stains and scratches on the light guide plate, especially 86 inches (1.9 m*1.2 m) or larger. Large size light guide plates are difficult to move. All of the above issues result in losses for companies.

In order to overcome the above drawbacks of the prior art, the present disclosure provides an edge-type backlight module in which the distance of a light bar for optical inspection of a light guide plate is adjustable, a liquid crystal display device employing the backlight module, and an edge-type backlight module. Provided is an optical inspection method for a backlight panel that employs a backlight module.

The technical solutions adopted by the present disclosure are as follows.

An edge-type backlight module, the backlight module including a backlight panel body, the backlight panel body being detachably connected to a first substrate for mounting a light guide plate to be inspected and the first substrate. and a light source moving module installed on the second substrate, and a light source mounted on the light source moving module.

According to the above technical solution, the light source moving module is used to drive the light source to move along the direction perpendicular to it, so that the distance between the light source and the light guide plate is adjusted, and the light guide plate is touched and moved. , the light guide plate will not be damaged or damaged, the loss can be reduced, and the cost can be saved.

In addition, the light source moving module includes a light source support frame, two L-shaped levers installed symmetrically for driving the light source support frame to move up and down, and a rotating device for driving the L-shaped levers to move in a fan shape. include.

In addition, the light source support frame includes a lateral support rod and two longitudinal guide rods perpendicular to the lateral support rod, the light source is mounted on the lateral support rod, and an L-shaped lever is located below the lateral support rod. Two guide members engaging with are symmetrically installed, and both side walls of each guide member are provided with slit-like through holes along the lateral direction.

Further, a stopper is provided at a position corresponding to the vertical guide rod on the second substrate to limit the movement position of the vertical guide rod, and the vertical guide rod is positioned between the stopper and the second substrate. Form a cavity in between.

According to the above technical solution, the stopper is used to limit the movement direction and position of the light source support frame, the light source support frame is moved along the direction perpendicular to it, and the light source is driven to be perpendicular to the light source support frame. By moving along the direction, the distance between the light source and the light entrance side of the light guide plate can be adjusted, and the probability of the light guide plate being judged incorrectly, dirty, and damaged can be greatly reduced, and the cost can be reduced. . Even if the finished product of the light guide plate passes the inspection, the optical detection value of the light guide plate will be low due to the improper distance between the light entrance side and the light bar when inspecting the light guide plate. In response to the misjudgment of the finished product, the present disclosure uses the light source moving module to move the light source along the direction perpendicular to it to adjust the distance between the light source and the light incident side of the light guide plate. This greatly reduces the probability of making an error in the pass/fail judgment of the light guide plate.
Further, a rotating shaft is installed at a position corresponding to the L-shaped lever of the second board, and the connecting part of the horizontal part and the vertical part of the L-shaped lever is installed on the rotating shaft of the second board.
The above technical solution ensures that the rotation axis is used to facilitate the fan-shaped movement of the L-shaped lever, and the L-shaped lever is rotated around the rotation axis.

Further, a projection for engaging with the guide member is provided at one end of the horizontal portion of the L-shaped lever, and the projection of the horizontal portion of the L-shaped lever is positioned within the through hole of the guide member.

The above technical solution adopts the engagement between the projection and the guide member, and when the L-shaped lever performs the fan-shaped movement, the engagement between the projection and the guide member pushes up or lowers the light source support frame. to achieve the purpose of adjusting the distance between the light source and the light guide plate.
Further, the rotating device includes a rotating disk and a knob, and both sides of the rotating disk are respectively connected to one end of the vertical part of the L-shaped lever through a link.
Said knob is mounted on the rear surface of the second substrate and connected to the rotating disk through a connecting shaft.

According to the above technical solution, the knob on the back of the second substrate is rotated to drive the turntable to rotate, and the turntable drives the L-shaped lever through the link to rotate into a fan shape, thereby supporting the light source. The frame can be pushed up or driven down to drive the light source through the light source support frame to achieve the purpose of adjusting the distance between the light source and the light guide plate.

Further comprising a shading module, wherein the shading module comprises a cover plate installed outside the light source moving module and a shading plate installed on the cover plate, both ends of the cover plate are fixedly connected to the second substrate, and the shading module Both sides of the plate are latched and fixed to the cover plate via edge strips.

According to the above technical solution, the shading plate is used to prevent the light emitted from the light source from leaking, and the cover plate is used to prevent the light source moving module from being detached from the second substrate.

A liquid crystal display device comprising the edge-type backlight module and a light guide plate, the light guide plate being fixed to a backlight panel body and facing a light source.
An optical inspection method for a light guide plate, which is realized based on the edge type backlight module as above, the method includes the following steps.
A light guide plate to be inspected is fixedly attached to the first substrate.
Rotating the knob clockwise, the knob drives the rotation of the wheel.
The turntable drives two L-shaped levers through two links in a fan-like motion around the axis of rotation.
The projections of the two L-shaped levers each perform a fan-shaped swing and push up the light source support frame at the same time.
The light source support frame moves the light source upward to bring the light source closer to the light entrance side of the light guide plate.
The backlight module optical measuring instrument is used to optically inspect the light guide plate to obtain the optical detection value of the light guide plate.

With the above technical solutions, the beneficial effects of the present disclosure are as follows.

(1) The present disclosure uses the light source moving module to move the light source to move along the direction perpendicular to it, thereby adjusting the distance between the light source and the light guide plate, preventing the light guide plate from being touched and moved; Losses can be reduced and costs can be saved without the light guide plate being stained or scratched.

(2) The body of the present disclosure is not a monolithic structure, but consists of two substrates that are detachably connected, making it easier to transport. In addition, these two substrates are aluminum substrates, which are easy to dissipate heat and do not cause bending or deformation of the plate material.

(3) The present disclosure adopts the structure of turning the knob on the back of the second substrate to drive the rotating disk to rotate, and the rotating disk drives the L-shaped lever through the link to rotate in a fan shape, thereby turning the light source The support frame can be pushed up or driven down to drive the light source through the light source support frame to achieve the purpose of adjusting the distance between the light source and the light guide plate. It is possible to greatly reduce the probability of errors in pass/fail judgment, stains, and scratches, thereby reducing costs.

The drawings of the specification, which form part of this disclosure, are used to provide a further understanding of the disclosure, and the exemplary embodiments of the disclosure and their descriptions are used to explain the present application. , should not unduly limit this disclosure.
4 is a schematic diagram of the overall structure of the edge-type backlight module of Embodiment 1; FIG. 4 is a schematic diagram of the cover plateless structure of the edge type backlight module of the first embodiment; FIG. 4 is a partially enlarged schematic diagram of the light source and the light source support frame of the first embodiment; FIG. FIG. 4 is a structural schematic diagram of the light source support frame of the first embodiment; FIG. 1 is a structural schematic diagram 1 of the light source moving module of the first embodiment; FIG. 2 is a structural schematic diagram 2 of the light source moving module of the first embodiment; 4 is a partially enlarged schematic view of the light shielding module of the first embodiment; FIG. 2 is a structural schematic diagram of the knob of the first embodiment; FIG.

The present disclosure will be further described below in combination with drawings and examples.

It should be noted that all of the following detailed descriptions are exemplary and are intended to further explain the present disclosure. Unless defined otherwise, all technical and scientific terms used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art.

It should be noted that the terminology used herein is used to describe particular embodiments only and is not intended to be limiting of the exemplary embodiments based on this application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise and, furthermore, it should be understood that "includes" herein. and/or where the term "comprising" is used, it also indicates the presence of features, steps, operations, devices, components and/or combinations thereof.

Embodiment 1 provides an edge-type backlight module, which includes a backlight panel body, a light source, a light source moving module and a shading module.

As shown in FIG. 1, the backlight panel body includes a first substrate 1 and a second substrate 2 for mounting and fixing a light guide plate to be inspected, and the first substrate 1 and the second substrate 2 are detachable. to form a receiving space for other elements installed in the backlight module, such as the light source, the light source moving module and the shading module. The first substrate 1 and the second substrate 2 which are detachably connected are not of an integral structure, and can be placed separately during transportation, facilitating transportation.

2 and 3, the light source moving module is installed on the front side of the second substrate 2, and includes a light source supporting frame 5, a rotating plate 6, a link 7, an L-shaped lever 8, and a rotating shaft 10. and a knob 14 , the light source 4 is installed on the light source support frame 5 .

As shown in FIG. 4, the light source support frame 5 includes a lateral support rod 51 and two longitudinal guide rods 52 perpendicular to the lateral support rod, the light source 4 is installed on the lateral support rod 51, and the light source 4 used to place the Two guide members 53 are symmetrically installed below the lateral support rod 51 , and uppermost sides of the two guide members 53 are fixedly connected to the bottom of the lateral support rod 51 . , the two guide members 53 are positioned between the two vertical support rods 52, and both side walls of each guide member 53 are provided with slit-shaped through holes 54 along the lateral direction, respectively, to form an L-shaped lever. Used to engage projections and transmit motion. An L-shaped lever 8 is installed in each of the two guide members 53 .

As shown in FIG. 5, a rotating shaft 10 is installed at a position corresponding to the L-shaped lever 8 on the second substrate, and the connecting portion between the horizontal portion 81 and the vertical portion 82 of the L-shaped lever 8 is located on the second substrate. is installed on the rotating shaft 10, so that the L-shaped lever 8 can be fan-shaped around the rotating shaft 10, the horizontal part 81 of the L-shaped lever 8 is located in the guide member 53, and the L-shaped lever 8 Two projections 83 are symmetrically installed at one end away from the vertical portion of the horizontal portion 81 of the guide member 53, and the projections 83 are positioned in the through holes 54 of both side walls of the guide member 53 and are slidable in the through holes 54. , and when the L-shaped lever makes a fanning motion about the rotation axis 10 , the projection 83 can push up or down the light source support frame 5 , thereby moving the light source 4 along a direction perpendicular to the light source support frame 5 . It can be used to adjust the distance between the light source and the light entrance side of the light guide plate assembly by moving the light source with the light guide plate assembly. can.

As shown in FIG. 6 , through holes are formed on both sides of the rotary disc 6 , and each through hole on the rotary disc is connected to one end of the vertical portion 82 of the L-shaped lever 8 away from the horizontal end via the link 7 . connected and used to drive the rotation of the L-shaped lever via link 7 .

As shown in FIG. 7, the shading module includes a cover plate 13 and a shading plate 11, the cover plate 13 is installed outside the light source moving module and fixedly mounted on the second substrate 2, and the light source moving module is used to prevent detachment from the second substrate 2, further prevent light rays from leaking from the light source to prevent the inspection of the light guide plate from being affected, and further to mount the light shielding plate 11 used for The light-shielding plate 11 is installed on the cover plate 13, and both sides of the light-shielding plate 11 are locked and fixed to the cover plate 13 through the edge strips 12, thereby fixing the light-shielding plate 11 to the cover plate 13 and making it difficult to separate. to prevent leakage of light emitted by the light source.

As shown in FIG. 8 , the knob 14 is attached to the rear side of the second substrate 2, and the knob 14 is connected to the rotating disk 6 through a connecting shaft. When the knob 14 rotates, the rotating disk 6 rotates. , the link 7 drives the L-shaped lever to fan-shaped around the rotary shaft 10, the projection 83 of the L-shaped lever pushes up or lowers the light source support frame 5, and the light source 4 is mounted on the light source support frame 5. By moving along the vertical direction, the distance between the light source and the first substrate and the second substrate can be adjusted to bring the light source closer to the light incident side of the light guide plate.

When using the edge-type backlight module provided by the present embodiment, the light guide plate to be inspected is fixed and attached to the first substrate by a plurality of positioning pins 3, and the knob 14 is turned clockwise to rotate the rotary disc 6. When driven to rotate, the L-shaped lever is driven by the link 7 to make a fan-shaped movement around the rotating shaft 10, and the protrusion 83 of the L-shaped lever pushes up the light source support frame 5 to make the light source 4 perpendicular to the light source support frame 5. direction to bring the light source closer to the light entrance side of the light guide plate.

In the edge type backlight module provided by this embodiment, the turntable 6 is driven to rotate by turning the knob 14 on the back side of the second substrate, and the turntable 6 and the L-shaped lever 8 are connected through the link 7. When the rotating disk 6 rotates, the L-shaped lever 8 also performs a fan-shaped motion, and the protrusion of the L-shaped lever 8 swings in a fan-shaped manner, driving the light source support frame 5 upward. or downward, and finally the light source 4 can be moved upward or downward. Adjust it so that it is closer to the side.

The first substrate 1 is an aluminum substrate and is used to mount and fix the light guide plate to be inspected. The second substrate 2 is also an aluminum substrate and is used to mount the light guide plate. The light source 4 generates a large amount of heat when emitting light, and if the heat cannot be dissipated, the plate material will be bent or deformed. By using the substrate, it is possible to dissipate heat well.

The first substrate 1 and the second substrate 2 are integrally connected with bolts, and when transportation is required, the bolts can be removed to remove the first substrate 1 and the second substrate 2, which facilitates transportation. .

In this embodiment, the light source 4 adopts an LED light bar, which is used as the light source for the entire backlight module. When fanned around, the projection 83 of the L-shaped lever 8 can push up or down the light source support frame 5 to move the light bar along a direction perpendicular to the light source support frame 5, and the light bar and By adjusting the distance from the light-incident side of the light guide plate assembly, it is possible to greatly reduce the probability of erroneous judgment of whether the light guide plate is acceptable, dirt, and scratches, reduce losses, and reduce costs. can.

As shown in FIG. 6 , a stopper 9 for limiting the movement position of the vertical guide rod 52 is provided at a position corresponding to the vertical guide rod 52 of the light source support frame 5 on the second substrate provided in this embodiment. It is installed and used to limit the position to which the light source support frame 5 moves downward. In this embodiment, the stopper 9 is attached to the second aluminum substrate 3 by screws, a cavity is formed between the stopper 9 and the second aluminum substrate 3, and the vertical guide rod 52 of the light source support frame 5 is Situated within the cavity, a longitudinal guide rod 52 can move along the direction that the stopper 9 restricts.

The present embodiment provides a liquid crystal display device, which includes a light guide plate and the edge type backlight module, the light guide plate is fixed on the first substrate 1 and facing the light source 4. .
Here, for the specific structure of the edge-type backlight module of this embodiment, please refer to the related description of the previous embodiment, and the description is omitted here.

In this embodiment, the light guide plate is fixedly attached to the first substrate with a plurality of positioning pins 3, and in this embodiment, the light guide plate is fixed to the first substrate using a plurality of positioning pins 3 and positioned. The pins 1 are mutually engaged with the locking grooves of the light guide plate to ensure that the light guide plate does not shake on the first substrate.

This embodiment provides an optical inspection method for a light guide plate, which is implemented based on the above edge-type backlight module, and includes the following steps.
S101, a light guide plate to be inspected is fixed and attached to the first substrate with a plurality of positioning pins.
S102, rotate the knob clockwise, and the knob drives the rotating disk 6 to rotate;
S103, the rotary disc drives the two L-shaped levers 8 through the two links 7 to make a fan motion around the rotary shaft 10;
S104, the projections 83 of the two L-shaped levers swing in a fan shape and push up the light source support frame 5. As shown in FIG.
S105, the light source support frame 5 drives the light source 4 to move upward along the direction perpendicular to the light source support frame 5, so that the light source approaches the light incident side of the light guide plate.
S106, using the backlight module optical measuring device BM-7 to optically inspect the light guide plate to obtain the optical detection value of the light guide plate.
Specifically, in step 106, the optical inspection of the light guide plate is implemented using the following solutions.

After the light source is brought close to the light guide plate, the composite film sheet is coated, which mainly includes some optical film sheets such as prism film, diffusion film and so on.

The observation lens of the backlight module optical measuring device BM-7 is brought into contact with the position where the composite film sheet is coated, and the optical data detected by the BM-7 instrument is recorded and analyzed, and the light guide plate has obvious defects in appearance. On the premise that there is no damage (for example, scratches or stains), if these optical data meet the standard, the product is accepted, and if it does not meet the standard, the product is defective.

The optical inspection method for the light guide plate provided by this embodiment is to turn the knob 14 on the back side of the second substrate to drive the rotary disc 6 to rotate, and the rotary disc 6 and the L-shaped lever 8 are connected through the link 7. When the rotating disk 6 rotates, the L-shaped lever 8 also moves in a fan shape, and the projection of the L-shaped lever 8 swings in a fan shape, thereby driving the light source support frame 5 upward or downward. , and finally the light source 4 can be moved upwards or downwards. In this embodiment, by converting the rotary motion of the knob into the linear motion of the light source, the light source is adjusted to approach the light incident side of the light guide plate, and then the backlight module optical measurement system BM-7 is used to move the light guide plate. Optical inspection is performed to provide the accuracy of the optically detected values of the light guide plate.

The backlight module of the present disclosure can be applied to inspect whether the optical indicators of the light guide plate pass when the light guide plate manufacturer produces the laser dot processed light guide plate or the ink printed light guide plate. .

Although the specific embodiments of the present disclosure have been described with reference to the drawings, this is not intended to limit the protection scope of the present disclosure, and those skilled in the art will be able to It should be understood that various modifications or variations that can be made by persons skilled in the art without creative efforts still fall within the protection scope of the present disclosure.

Claims (8)

including a backlight panel body and a light source moving module;
The backlight panel body includes a first substrate for mounting a light guide plate to be inspected, and a second substrate on which a light source moving module is installed and detachably connected to the first substrate,
The light source moving module includes a light source, a light source support frame on which the light source is mounted , two L-shaped levers installed symmetrically for driving the light source support frame to move up and down , and two L-shaped levers. including a rotating device that drives the to move in a fan shape,
The light guide plate is fixed to the backlight panel body and installed facing the light source for inspection.
An edge-type backlight module for light guide plate inspection, characterized by: The light source support frame includes a lateral support rod and two longitudinal guide rods perpendicular to the lateral support rod, the light source is mounted on the lateral support rod and engaged with an L-shaped lever below the lateral support rod. 2. The guide according to claim 1 , characterized in that two guide members for fitting are symmetrically installed, and slit-like through holes are formed in both side walls of each guide member along the lateral direction. Edge type backlight module for light plate inspection . A stopper is installed at a position corresponding to the vertical guide rod on the second substrate to limit the movement position of the vertical guide rod, and the vertical guide rod is formed between the stopper and the second substrate. 3. The edge-type backlight module for inspecting a light guide plate according to claim 2 , wherein the edge-type backlight module is located in a recessed cavity. each of the L-shaped levers has a horizontal portion and a vertical portion;
A connecting portion of the horizontal portion and the vertical portion of the L-shaped lever is rotatably supported by a rotation shaft provided on the second substrate , and the L-shaped lever performs fan-shaped movement around the rotation shaft.
The edge-type backlight module for light guide plate inspection according to claim 1 , characterized in that: 5. A projection for engaging with the guide member is provided at one end of the horizontal portion of the L-shaped lever, and the projection of the horizontal portion of the L-shaped lever is positioned in the through hole of the guide member. The edge type backlight module for light guide plate inspection according to . The rotating device comprises a rotating disk and a knob, both sides of the rotating disk are respectively connected to one end of the vertical part of the L-shaped lever through a link,
2. The edge-type backlight module for inspecting a light guide plate as claimed in claim 1 , wherein the knob is attached to the rear surface of the second substrate and connected to the rotating disk through a connecting shaft. 2. The edge type backlight module of claim 1, further comprising a shading module,
The shading module includes a cover plate installed outside the light source moving module and a shading plate installed on the cover plate, both ends of the cover plate are fixedly connected to the second substrate, and both sides of the shading plate form edge strips. An edge-type backlight module for inspecting a light guide plate, which is locked and fixed to a cover plate through an opening. a step of fixing and attaching the light guide plate to be inspected to the first substrate;
turning the knob clockwise, the knob driving the turntable to rotate;
the rotating disc drives two L-shaped levers through two links to move in a fan shape about the axis of rotation;
the protrusions of the two L-shaped levers swinging in a fan shape and pushing up the light source support frame;
The light source support frame drives the light source to move upward to bring the light source closer to the light entrance side of the light guide plate,
The light guide plate inspection according to any one of claims 1 to 7 , comprising performing optical inspection of the light guide plate using a backlight module optical measuring instrument to obtain an optical detection value of the light guide plate. An optical inspection method for a light guide plate realized based on an edge-type backlight module for

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