Backlight module detection device
By designing a backlight detection fixture, the metal probe and air pressure push the components to contact the backlight FPC, combined with upper computer communication, the problem of heat dissipation abnormalities caused by poor attachment effect of LED light strips is solved, and efficient detection and screening of poor products is achieved, which improves detection efficiency and product quality.
Patent Information
- Application Number
- CN202421627654.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-07-10
AI Technical Summary
The prior art cannot effectively detect the adhesion effect between the LED light strip and the backlight iron frame, resulting in abnormal heat dissipation, affecting the client display effect, and the module brightness is reduced only by monitoring the temperature through NTC impedance.
A backlight detection fixture is designed, including an upper clamp, a lower pad, a return spring and a metal probe. The metal probe is contacted with the backlight FPC through the air pressure pushing component. Combined with the upper computer and the UART serial port communication, the detection of multiple backlight products is achieved, and products with poor light strip attachment effect and poor LED functions are screened out.
The simultaneous detection of LED light strip attachment effect and LED functions is achieved, which improves detection efficiency, screens out bad products, ensures product quality, and avoids the reduction of module brightness.
Smart Images
Figure CN223092109U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of detection jigs, in particular to a backlight module detection device. Background Art
[0002] The LED light bar FPC is connected to the backlight iron frame through an FPC double-sided thermal conductive adhesive, which is used to dissipate the heat generated by the LED lamp. However, if the thermal conductive adhesive between the LED light bar and the iron frame is not attached well, the heat cannot be conducted away in time, which will cause the NTC impedance to become very small, thus affecting the display effect of the client.
[0003] In the prior art, the BLU temperature is generally monitored through the NTC impedance. When the set threshold is exceeded, the module BLU will perform a current reduction operation, but this method will cause the module brightness to decrease.
[0004] Currently, when an NTC anomaly occurs, it is found through analysis that it is caused by abnormal heat dissipation due to poor attachment of the LED light bar. At present, for this kind of detection, most are only visual inspections and cannot effectively identify whether the attachment effect of the LED light bar is normal.
[0005] Therefore, in view of the above-mentioned problems, there is an urgent need in the current field for a device that can not only effectively detect the attachment effect of the light bar FPC but also detect the functional performance of the LED backlight beads. Summary of the Utility Model
[0006] The utility model aims to provide a technical solution to solve the above problems in order to overcome the above deficiencies.
[0007] To achieve the above purpose, the utility model provides the following technical solution: a backlight module detection device, including a backlight detection jig, the backlight detection jig includes an upper clamping plate and a lower backing plate, and both sides between the upper clamping plate and the lower backing plate are connected by return springs; a plurality of metal probes are also inserted into the interior of the lower backing plate, and the bottom of the metal probe is a probe head.
[0008] As a further solution of the utility model: the top of the metal probe is connected to the bottom of the upper clamping plate, the bottom of the metal probe penetrates through the lower backing plate, and an arc protrusion is integrally formed on the lower rod body of the metal probe, and the top of the arc protrusion fits against the bottom of the lower backing plate.
[0009] As a further solution of the utility model: it further includes a backlight main body, a backlight FPC is connected to the backlight main body, and probe points corresponding to the plurality of metal probes are arranged on the backlight FPC.
[0010] As a further solution of the present utility model: It further includes a pneumatic driving assembly, and the pneumatic driving assembly can be a cylinder. The pneumatic driving assembly is arranged on the top of the upper clamping plate, and the upper clamping plate can be pushed by the pneumatic driving assembly to make the metal probe contact the backlight FPC.
[0011] As a further solution of the present utility model: It further includes a host computer, and the host computer communicates with the backlight detection fixture through a UART serial port.
[0012] As a further solution of the present utility model: The backlight detection fixture is provided with at least four groups of metal probes. Adjacent multiple metal probes are in a group, and the installation positions of the metal probes correspond to the positions of the backlight FPC on the backlight body.
[0013] As a further solution of the present utility model: The lower backing plate is provided with at least four pieces, and there is a gap between every two lower backing plates. Each lower backing plate has a group of metal probes.
[0014] As a further solution of the present utility model: The area of the lower backing plate is smaller than the area of the backlight body.
[0015] As a further solution of the present utility model: Each group of the metal probes is provided with at least ten pieces. Among them, eight metal probes are provided with conducting wires, and there is a gap between the metal probes.
[0016] As a further solution of the present utility model: Each backlight FPC is provided with at least ten probing points, and there is a gap between the probing points. The gap between the probing points is the same as the gap distance between the metal probes.
[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0018] In this application, the backlight detection fixture composed of structures such as the upper clamping plate, the lower backing plate, the return spring, and the metal probes is provided. The backlight detection fixture is provided with multiple groups of designed metal probes, and each group corresponds to 1 backlight product. It can not only detect the quality of the LED lamp beads, screen out functional defects such as LED open circuit / short circuit, but also detect the attachment effect of the LED light strip. By detecting the NTC, products with poor light strip attachment effect can be screened out. At the same time, this solution can detect multiple backlight products simultaneously, thereby improving the detection efficiency and having a better effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic side sectional view of a partial enlargement of the backlight detection fixture of the present utility model;
[0020] Figure 2 It is a schematic top view of the backlight detection fixture of the present utility model;
[0021] Figure 3 It is a top view structural schematic diagram of the backlight main body of the present utility model;
[0022] Figure 4 It is a structural schematic diagram when the backlight main body of the present utility model is being detected on a backlight detection fixture;
[0023] Figure 5 It is a schematic diagram of the detection circuit of the present utility model;
[0024] Figure 6 It is the present utility model Figure 5 An enlarged schematic diagram at position A in;
[0025] Figure 7 It is the present utility model Figure 5 An enlarged schematic diagram at position B in;
[0026] Figure 8 It is the present utility model Figure 5 An enlarged schematic diagram at position C in;
[0027] Figure 9 It is the present utility model Figure 5 An enlarged schematic diagram at position D in;
[0028] Figure 10 It is the present utility model Figure 5 An enlarged schematic diagram at position E in;
[0029] Figure 11 It is the present utility model Figure 5 An enlarged schematic diagram at position F in;
[0030] Figure 12 It is the present utility model Figure 5 An enlarged schematic diagram at position G in.
[0031] The reference numerals and names in the figure are as follows:
[0032] 1. Upper clamping plate; 2. Lower backing plate; 3. Return spring; 4. Metal probe; 5. Backlight main body; 6. Backlight FPC. Specific embodiments
[0033] Next, with reference to the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0034] Please refer to Figures 1 - 12, A backlight module detection device, including a backlight detection fixture. The backlight detection fixture includes an upper clamping plate 1 and a lower backing plate 2, and both sides between the upper clamping plate 1 and the lower backing plate 2 are connected by return springs 3; multiple metal probes 4 are also inserted inside the lower backing plate 2, and the bottom of the metal probe 4 is a probe tip. It also includes a backlight main body 5, a backlight FPC 6 is connected to the backlight main body 5, and detection points corresponding to the multiple metal probes 4 are arranged on the backlight FPC 6. It further includes a host computer, and the host computer communicates with the backlight detection fixture through a UART serial port. The host computer controls the backlight switch and NTC sampling of the product and outputs the detection results.
[0035] Please refer to Figure 1 , In this embodiment, the top of the metal probe 4 is connected to the bottom of the upper clamping plate 1, the bottom of the metal probe 4 penetrates through the lower backing plate 2, and an arc-shaped protrusion is integrally formed on the lower rod body of the metal probe 4, and the top of the arc-shaped protrusion fits against the bottom of the lower backing plate 2.
[0036] Specifically, an arc-shaped protrusion is provided on the lower section of the metal probe 4, so as to limit the rising distance of the metal probe 4 and prevent the metal probe 4 from detaching from the lower backing plate 2. The lifting of the metal probe 4 relies on the return spring 3, and when the return spring 3 returns, it can drive the upper clamping plate 1 to lift, thereby driving the metal probe 4 to lift.
[0037] Please refer to Figure 1 , In this embodiment, it also includes a pneumatic pushing component, and the pneumatic pushing component can be a cylinder. The pneumatic pushing component is arranged on the top of the upper clamping plate 1, and the upper clamping plate 1 can be pushed by the pneumatic pushing component to make the metal probe 4 contact the backlight FPC 6.
[0038] Specifically, by setting a pneumatic pushing component (not shown), the downward pressure of the power output shaft of the pneumatic pushing component can be used to push the upper clamping plate 1 to move downward and approach the lower backing plate 2, thereby driving the metal probe 4 to contact the detection points on the backlight FPC 6 and maintaining stability.
[0039] Please refer to Figures 1 - 2 , In this embodiment, the backlight detection fixture is provided with at least four groups of metal probes 4. Adjacent multiple metal probes 4 are in a group, and the setting positions of the metal probes 4 correspond to the positions of the backlight FPC 6 on the backlight main body 5; the lower backing plate 2 is provided with at least four pieces, and there is a gap between every two lower backing plates 2, and each lower backing plate 2 has a group of metal probes 4.
[0040] Specifically, the four groups of metal probes 4 can correspondingly detect four backlight main bodies 5, and the positions of the metal probes 4 correspond to the positions of the backlight FPC 6, so it can be ensured that every time the upper clamping plate 1 is pressed down, the metal probe 4 can contact the detection points on the backlight FPC 6, thereby ensuring the stability after conduction.
[0041] Please refer to Figures 1 - 4 , in this embodiment, the area of the lower backing plate 2 is smaller than the area of the backlight main body 5.
[0042] Specifically, the area of the lower backing plate 2 being smaller than the area of the backlight main body 5 facilitates the lower backing plate 2 to be located above the backlight main body 5, making it convenient to observe the positioning effect.
[0043] Please refer to Figure 1 , in this embodiment, each group of metal probes 4 has at least ten metal probes. Among them, eight metal probes 4 are provided with conducting wires, and there are intervals between the metal probes 4; each backlight FPC 6 has at least ten probe points, and there are intervals between the probe points. The intervals between the probe points are the same as the interval distances between the metal probes 4.
[0044] Specifically, the conducting wires can connect the corresponding metal probes 4 to the detection board. The intervals between the metal probes 4 are left to avoid the influence of too close distance on detection and movement. The distances between the probe points on the backlight FPC 6 being the same as the distances between the metal probes 4 facilitates each metal probe 4 to make contact and conduction with the corresponding probe point.
[0045] During use:
[0046] Prepare the samples to be tested 1, 2, 3, and 4 and place them on the detection table (the samples to be tested 1, 2, 3, and 4 are four backlight main bodies 5). The backlight detection fixture is located above the samples. Among them, the four lower backing plates 2 respectively correspond to the four samples (as Figure 1 shown). Start the pneumatic pushing component (cylinder). The power output shaft of the pneumatic pushing component pushes the upper clamping plate 1 downward, thereby pushing the metal probes 4 into contact with the probe points on the backlight FPC 6, and then the detection can start. After the detection is completed, the power output shaft of the pneumatic pushing component retracts, and the upper clamping plate 1 is pushed to lift under the restoring action of the return spring 3, thereby driving the metal probes 4 away from the probe points on the backlight FPC 6;
[0047] For the detailed detection circuit schematic, please refer to Figures 5 - 12 , multiple products are detected simultaneously by using multi-channel ADC sampling. Communication between the host computer and the backlight detection fixture is through the UART serial port. The host computer controls the backlight switch and NTC sampling of the products and outputs the detection results (realize the detection of the performance (open / short circuit / overvoltage of LED lights) and NTC heat dissipation status of multiple backlight products at the same time);
[0048] After the LED light is turned on, the NTC senses the heat dissipation of the LED and its resistance will decrease sharply. It is necessary to collect the NTC data once before the LED light is turned on; after the LED is turned on for a set time interval, collect the NTC data again to determine whether the heat dissipation of the product is okay through the temperature rise; the host computer communicates with the backlight detection fixture through the UART serial port, controls the backlight to turn on and off, controls the sampling of the NTC, and outputs the detection result.
[0049] ADC sampling circuit: NTC1 is connected to GND, and NTC2 is connected to the ADC sampling input PIN.
[0050] It should be noted that:
[0051] The ADC mentioned in the text is the abbreviation of Analog-to-Digital Converter, which refers to an analog-to-digital converter or an analog-digital converter, a device that converts a continuously changing analog signal into a discrete digital signal.
[0052] The UART mentioned in the text is the Universal Asynchronous Receiver / Transmitter, a general-purpose serial data bus used for asynchronous communication. This bus is bidirectional and can achieve full-duplex transmission and reception.
[0053] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.
Claims
1. A backlight module detection device, characterized in that, Including a backlight detection fixture, the backlight detection fixture includes an upper clamping plate (1) and a lower backing plate (2), and both sides between the upper clamping plate (1) and the lower backing plate (2) are connected by a return spring (3); Multiple metal probes (4) are also inserted inside the lower backing plate (2), and the bottom of the metal probe (4) is a probe tip.
2. The backlight module detection device according to claim 1, wherein, The top of the metal probe (4) is connected to the bottom of the upper clamping plate (1), the bottom of the metal probe (4) penetrates through the lower backing plate (2), and an arc-shaped protrusion is integrally formed on the lower rod body of the metal probe (4), and the top of the arc-shaped protrusion fits against the bottom of the lower backing plate (2).
3. The backlight module detection device according to claim 1, characterized in that, It also includes a backlight main body (5), a backlight FPC (6) is connected to the backlight main body (5), and probe points corresponding to multiple metal probes (4) are provided on the backlight FPC (6).
4. The backlight module detection device according to claim 1, characterized in that It also includes a pneumatic pushing component, the pneumatic pushing component can be a cylinder, the pneumatic pushing component is arranged on the top of the upper clamping plate (1), and the upper clamping plate (1) can be pushed by the pneumatic pushing component to make the metal probe (4) contact the backlight FPC (6).
5. The backlight module detection device according to claim 1, wherein, It also includes a host computer, and communication between the host computer and the backlight detection fixture is through a UART serial port.
6. The backlight module detection device according to claim 1, wherein, The backlight detection fixture is provided with at least four groups of metal probes (4), and multiple adjacent metal probes (4) are in a group, and the setting positions of the metal probes (4) correspond to the positions of the backlight FPC (6) on the backlight main body (5).
7. The backlight module detection device according to claim 6, wherein There are at least four lower backing plates (2) provided, and there is a gap between every two lower backing plates (2), and a group of metal probes (4) is provided on each lower backing plate (2).
8. A backlight module detection device according to claim 1, characterized in that, The area of the lower backing plate (2) is smaller than the area of the backlight main body (5).
9. The backlight module detection device according to claim 1, characterized in that Each group of the metal probes (4) is provided with at least ten, and eight of the metal probes (4) are provided with conducting wires, and there are gaps between the metal probes (4).
10. The backlight module detection device according to claim 3, wherein, Each backlight FPC (6) is provided with at least ten probe points, and there are gaps between the probe points, and the gap between the probe points is the same as the gap distance between the metal probes (4).