Mini LED chip detection device

Abstract

The utility model provides a mini LED chip detection device, which comprises a laser transmitter, a light guide plate and a laser receiver, the laser transmitter is arranged on one side of the light guide plate, the laser receiver is arranged on the other side of the light guide plate, more than one laser channel is arranged on the light guide plate, one end of the laser channel is arranged corresponding to the laser transmitter, and the other end of the laser channel is arranged corresponding to the laser receiver. The other end of the laser channel is arranged corresponding to the laser receiver, a first refraction piece set and a second refraction piece set are arranged on the laser channel, one end of the first refraction piece set is used for receiving light emitted by the laser emitter, the first refraction piece set and the second refraction piece set protrude out of the light guide plate, and a gap is formed between the first refraction piece set and the second refraction piece set. According to the utility model, whether the position of the mini LED chip on the lamp panel deviates or not can be accurately detected through the light guide plate by laser, the structure is simple, and the detection efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of chip detection, and in particular to a mini LED chip detection device. Background Art

[0002] Mini LED chips are widely used in display modules and other fields due to their small size. In the process of mounting mini LED chips, a mounting machine is usually used to assemble the LED chips. During the assembly process, a negative pressure suction nozzle is driven by a motor to make reciprocating movements between the wafer and the substrate, and the chip on the wafer is adsorbed and transported to the top of the substrate. Solder paste is pre-smeared near the contacts above the substrate, and the chip is attached to the outside of the solder paste for fixation. When the chip is mounted, since the chip is moved by a negative pressure suction nozzle, deviations (such as chip offset, etc.) are inevitable. In this case, the chip needs to be tested. If the chip only has a slight offset after the test, the chip needs to be corrected. To solve this technical problem, such as Chinese patent application No. It is 202310829633.2, and the publication date is 2023.08.04. It discloses a Mini-LED patch detection device and detection method, which relates to the field of Mini-LED patch detection. A substrate, a driving mechanism and a wafer are installed above the mounting seat. The output end of the driving mechanism is connected to a negative pressure mechanism, and the negative pressure mechanism is located above the substrate and the wafer. There are multiple groups of LED chips above the wafer. The negative pressure mechanism patches the multiple groups of LED chips on the substrate. Moving mechanisms are installed under the substrate and the wafer. The mounting seat is provided with a detection mechanism, and a detection camera is installed at the center of the detection mechanism.

[0003] In the process of detecting the placed LED chip, the above patent uses a camera to capture the relative position of the LED chip and the two sets of push plates to detect whether the position of the LED chip is offset. However, in this process, the mini LED chips on the light board need to be captured one by one to accurately detect whether the position of the LED chip is offset. This requires cameras to be installed at multiple positions, and the cameras need to detect the LED chips. At the same time, due to the small size of the mini LED chip, the accuracy of the camera is required to be high. Utility Model Content

[0004] The utility model aims to provide a mini LED chip detection device, which can accurately detect whether the position of the mini chip on the lamp board is offset by passing laser through a light guide plate, and has a simple structure and high detection efficiency.

[0005] To achieve the above-mentioned purpose, a mini LED chip detection device includes a laser transmitter, a light guide plate and a laser receiver, wherein the laser transmitter is arranged on one side of the light guide plate, and the laser receiver is arranged on the other side of the light guide plate. More than one laser channel is arranged on the light guide plate, one end of the laser channel is arranged corresponding to the laser transmitter, and the other end of the laser channel is arranged corresponding to the laser receiver. A refraction plate group 1 and a refraction plate group 2 are arranged on the laser channel, one end of the refraction plate group 1 is used to receive the light emitted by the laser transmitter, the refraction plate group 1 and the refraction plate group 2 are protruding from the light guide plate, and a spacing is arranged between the refraction plate group 1 and the refraction plate group 2, and the spacing matches the mini LED chip on the light board.

[0006] The above arrangement, by arranging the laser transmitter on one side of the light guide plate and the laser receiver on the other side of the light guide plate, after the light guide plate and the light board are placed in a dark test environment, the laser transmitter can emit laser light through the light guide plate, and finally be received by the laser receiver; by arranging the refraction plate group 1 at intervals on the upper light guide layer and the refraction plate group 2 at intervals on the lower light guide layer, and making the refraction plate group 1 and the refraction plate group 2 protrude through the lower light shielding layer, after the laser passes through the upper light guide layer and the laser channel, the propagation route of the laser can be changed by the refraction plate group 1 and refracted by the mini led chip, so that the refracted laser can then pass through the refraction plate group 2 to change the propagation route and be emitted from the lower light guide layer; and the refraction plate group 1 and the refraction plate group 2 are staggered and the spacing between the refraction plate group 1 and the refraction plate group 2 matches the mini led chip on the light board, so that when the light guide plate is placed on the light board, the mini led chip can be placed on the light board. The LED chip is matched and arranged in the distance between the refraction plate group 1 and the refraction plate group 2, so that the miniLED chip on the lamp board can be refracted by laser, and finally the laser receiver is received to confirm whether the outgoing refraction angle is offset. This has a simple structure and high detection reliability.

[0007] Furthermore, the light guide plate includes an upper light shading layer, an upper light guiding layer, a middle light shading layer, a lower light guiding layer and a lower light shading layer, the upper light guiding layer is provided with more than two refractive plate groups 1 which are spaced apart from each other, the lower light guiding layer is provided with more than two refractive plate groups 2 which are spaced apart from each other, and the other ends of the refractive plate group 1 and the refractive plate group 2 both extend downward and protrude through the lower light shading layer.

[0008] The above arrangement, by providing an upper light-shielding layer, a middle light-shielding layer and a lower light-shielding layer, shields the upper light-guiding layer and the lower light-guiding layer, prevents leakage of light from the upper light-guiding layer and the lower light-guiding layer, thereby affecting the refraction of the laser.

[0009] Furthermore, one end of the refractive sheet group 1 is fixed on the upper light guide layer, and the other end of the refractive sheet group 1 extends downward and sequentially penetrates the middle light shielding layer, the lower light guide layer and the lower light shielding layer to protrude.

[0010] The above arrangement can change the propagation path of the laser after it enters the upper light-shielding layer through the refraction plate group.

[0011] Furthermore, one end of the refractive sheet group 2 is fixed on the lower light guide layer, and the other end of the refractive sheet group 2 extends downward and penetrates through the lower light shielding layer to protrude.

[0012] The above arrangement can change the propagation path of the refracted laser light through the refraction plate group 2 to enter the lower light guide layer and emit from the lower light guide layer.

[0013] Furthermore, the refractive sheet group 1 includes a box body 1 and at least two refractive lenses 1, the refractive lenses 1 are arranged at both ends of the box body 1, and openings 1 are provided on both sides of the box body 1 and at positions corresponding to the refractive lenses 1, and the angle between the refractive lenses 1 and the box body 1 in the vertical direction is set to 45°~60°.

[0014] The above arrangement makes it easy for the laser to enter the upper light guide layer, then pass through the opening at one end of the box body and hit the refractive lens to change the propagation path of the laser, and then pass through the opening at the other end of the box body and hit the mini LED chip.

[0015] Furthermore, the refractive sheet group 2 includes a box body 2 and at least two refractive lenses 2, the refractive lenses 2 are arranged at both ends of the box body 2, openings 2 are provided on both sides of the box body 2 and at positions corresponding to the refractive lenses 2, and the angle between the refractive lenses 2 and the box body 2 in the vertical direction is set to 45°~60°.

[0016] The above arrangement facilitates the laser after refraction by the mini LED chip to pass through the opening 2 at one end of the box body 2 and be projected onto the refractive lens 2 to change the propagation path of the laser, and then pass through the opening 2 at the other end of the box body 2 and be projected from the lower light guide layer.

[0017] Furthermore, two ends of the lower light-shielding layer are fixed with alignment slots.

[0018] The above settings prevent deviations from occurring during the process of placing the light guide plate on the light board.

[0019] Furthermore, the wavelength of the laser emitted by the laser emitter is set to 720nm ~ 760nm.

[0020] The above setting enables the laser to be refracted after passing through the light guide plate and the mini LED chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the planar structure of the utility model.

[0022] Figure 2 It is an exploded schematic diagram of the light guide plate in the utility model.

[0023] Figure 3 for Figure 1 Enlarged view of point A in the middle.

[0024] Figure 4 for Figure 1 Enlarged view of point B in the middle.

[0025] Figure 5 for Figure 1 Enlarged view of center C.

[0026] Figure 6 It is a schematic diagram of the structure of the laser channel in the upper light guide layer in the utility model.

[0027] Figure 7 It is a schematic diagram of the structure of the laser channel in the lower light guide layer in the utility model. DETAILED DESCRIPTION

[0028] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] like Figure 1-7As shown, the embodiment of the utility model provides a mini LED chip detection device, including a laser emitter 1, a light guide plate and a laser receiver 3, wherein the laser emitter 1 is arranged on one side of the light guide plate, and the laser receiver 3 is arranged on the other side of the light guide plate, and the light guide plate is provided with more than one laser channel, one end of the laser channel is arranged corresponding to the laser emitter, and the other end of the laser channel is arranged corresponding to the laser receiver, and the laser channel includes a first light guide groove 01 arranged on the upper light guide layer 22, and a second light guide groove 02 arranged on the lower light guide layer 24, one end of the first light guide groove 01 is arranged corresponding to the laser emitter 1, and one end of the first light guide groove 01 is fixed with one end of the refraction plate group 1, and one end of the second light guide groove 02 is fixed with one end of the refraction plate group 2, and the other end of the second light guide groove 02 is arranged corresponding to the laser receiver 3, and the number of laser channels is the same as that of the Mini LED chip to be tested. Corresponding to the number of LED chips 6, a refraction plate group 1 and a refraction plate group 2 are arranged on the laser channel. The light guide plate includes an upper light-shielding layer 21, an upper light-guiding layer 22, a middle light-shielding layer 23, a lower light-guiding layer 24 and a lower light-shielding layer 25 arranged in sequence from top to bottom. The upper light-guiding layer 21 is provided with more than two refraction plate groups 1 arranged at intervals, and the lower light-guiding layer 24 is provided with more than two refraction plate groups 2 arranged at intervals. The refraction plate group 1 and the refraction plate group 2 are staggered along the length direction of the light guide plate. In this embodiment, the laser receiver 3 is connected to the computer terminal (not marked in the figure). In this embodiment, each row has 3 first light guide grooves 01 and 3 second light guide grooves 02. A first light guide groove 01 on each row is transmitted downward through the refraction plate group 1 and then passes through the LED chip and the refraction plate group 2 and then is emitted through a second light guide groove 02.

[0030] In this embodiment, if Figure 1 As shown, one end of the refractive plate group one is fixed on the upper light guide layer 22, and the middle light shielding layer 23, the lower light guide layer 24 and the lower light shielding layer 25 are respectively provided with through holes (not marked in the figure) matching the refractive plate group one, and the other end of the refractive plate group one extends downward through the through hole and sequentially penetrates the middle light shielding layer 23, the lower light guide layer 24 and the lower light shielding layer 25 to protrude, so that the propagation path of the laser after entering the upper light guide layer 22 can be changed by the refractive plate group one; one end of the refractive plate group two is fixed on the lower light guide layer 24, and the lower light shielding layer 25 is provided with a through hole matching the refractive plate group two, and the other end of the refractive plate group two extends downward through the through hole and penetrates the lower light shielding layer 25 to protrude, so that the propagation path of the laser after refracting the mini chip 6 can be changed by the refractive plate group two to enter the lower light guide layer 25 and emit from the lower light guide layer 25; the spacing between the refractive plate group one and the refractive plate group two matches the mini core 6 on the lamp board.

[0031] like Figure 1As shown, the refractive sheet group 1 includes a box body 41 and at least two refractive lenses 42. In the present embodiment, two refractive lenses 42 are arranged in one box body 41, and the two refractive lenses 42 are arranged at two ends of the box body 41 respectively. The angle between the refractive lens 42 located in the upper light guide layer 22 of the box body 41 and the vertical direction of the box body 41 is set to 45°, and the angle between the refractive lens 42 at the other end of the box body 41 and the vertical direction is set to 60°. Openings 43 are arranged on both sides of the box body 41 and at positions corresponding to the refractive lenses 42.

[0032] like Figure 1 As shown, the refractive sheet group 2 includes a box body 51 and at least two refractive lenses 52. In the present embodiment, two refractive lenses 52 are arranged in one box body 51, and the two refractive lenses 52 are arranged at two ends of the box body 51 respectively. The angle between the refractive lens 52 located in the lower light guide layer 24 of the box body 51 and the vertical direction of the box body 51 is set to 45°, and the angle between the refractive lens 52 at the other end of the box body 51 and the vertical direction is set to 60°. Openings 53 are arranged on both sides of the box body 51 and at positions corresponding to the refractive lenses 52.

[0033] like Figure 1 As shown, in this embodiment, two alignment grooves 7 are fixed at both ends of the lower light-shielding layer 25, which can avoid deviation when the light guide plate is placed on the light board 8; the laser wavelength emitted by the laser emitter 1 is set to 730nm, so that the laser can be refracted after passing through the light guide plate and the mini chip.

[0034] In this embodiment, if Figure 3 , 4 As shown in FIG. 5 , the laser passes through the light guide plate and is emitted from the refraction plate group 1, and is refracted after passing through the mini chip 6. Then the refracted laser enters the refraction plate group 2 and is emitted from the light guide plate, and is finally received by the laser receiver 3. Figure 3 , 4 As shown, it is possible to determine whether the position of the mini chip 6 on the light board 8 is offset by projecting the received laser onto the light board, or by confirming whether there is a deviation between the laser receiver and the preset correct refraction angle, such as Figure 5 As shown, when the laser does not refract, it is determined that there is no mini chip 6 at the position.

Claims

1. A mini LED chip detection device, characterized in that: It includes a laser transmitter, a light guide plate and a laser receiver. The laser transmitter is arranged on one side of the light guide plate, and the laser receiver is arranged on the other side of the light guide plate. The light guide plate is provided with more than one laser channel, one end of the laser channel is arranged corresponding to the laser transmitter, and the other end of the laser channel is arranged corresponding to the laser receiver. A refraction plate group 1 and a refraction plate group 2 are arranged on the laser channel, one end of the refraction plate group 1 is used to receive the light emitted by the laser transmitter, the refraction plate group 1 and the refraction plate group 2 are protruded from the light guide plate, and a spacing is arranged between the refraction plate group 1 and the refraction plate group 2, and the spacing matches the mini LED chip on the light board.

2. A mini LED chip detection device according to claim 1, characterized in that: The light guide plate includes an upper light shading layer, an upper light guiding layer, a middle light shading layer, a lower light guiding layer and a lower light shading layer. The upper light guiding layer is provided with more than two refractive plate groups 1 that are spaced apart from each other, and the lower light guiding layer is provided with more than two refractive plate groups 2 that are spaced apart from each other. The other ends of the refractive plate group 1 and the refractive plate group 2 both extend downward and protrude through the lower light shading layer.

3. The mini LED chip detection device according to claim 1, characterized in that: One end of the refractive sheet group 1 is fixed on the upper light guide layer, and the other end of the refractive sheet group 1 extends downward and sequentially penetrates the middle light shielding layer, the lower light guide layer and the lower light shielding layer to protrude.

4. The mini LED chip detection device according to claim 1, characterized in that: One end of the refractive sheet group 2 is fixed on the lower light guide layer, and the other end of the refractive sheet group 2 extends downward and penetrates through the lower light shielding layer to protrude.

5. The mini LED chip detection device according to claim 3, characterized in that: The refractive sheet group 1 includes a box body 1 and one or more refractive lenses 1, the refractive lenses 1 are arranged at both ends of the box body 1, and openings 1 are arranged on both sides of the box body 1 and at positions corresponding to the refractive lenses 1, and the angle between the refractive lenses 1 and the vertical direction is set to 45°~60°.

6. The mini LED chip detection device according to claim 4, characterized in that: The refractive sheet group 2 includes a box body 2 and one or more refractive lenses 2, the refractive lenses 2 are arranged at both ends of the box body 2, openings 2 are arranged on both sides of the box body 2 and at positions corresponding to the refractive lenses 2, and the angle between the refractive lenses 2 and the vertical direction is set to 45°~60°.

7. The mini LED chip detection device according to claim 2, characterized in that: Alignment slots are fixed at both ends of the lower light shielding layer.

8. The mini LED chip detection device according to claim 1, characterized in that: The wavelength of the laser emitted by the laser transmitter is set to 720nm ~ 760nm.

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