LED testing machine calibration methods, LED test standard sample tubes, and LED calibration equipment

Abstract

This invention provides a calibration method for an LED testing machine, an LED testing standard sample tube, and an LED calibration device. The LED testing machine calibration method includes the following steps: providing an LED testing standard sample tube, which includes light-emitting units with adjustable luminous intensity; selecting multiple LED elements within a batch to be tested, obtaining the luminous intensity of each LED element when a set test voltage is input, and calculating the average luminous intensity of each LED element; adjusting the luminous intensity of the light-emitting units of the LED testing standard sample tube to the average luminous intensity; and calibrating the LED testing machine using the LED testing standard sample tube. Compared with the prior art, this invention adjusts the luminous intensity of the LED testing standard sample tube to the average luminous intensity of the selected multiple LED elements, and then uses the LED testing standard sample tube to calibrate the LED testing machine, thereby improving the accuracy of the LED testing machine and resulting in better consistency in the luminous intensity of LED elements that pass the LED testing machine test.

Description

Technical Field

[0001] This invention relates to the field of LED testing technology, and in particular to an LED testing machine calibration method, an LED testing standard sample tube, and an LED calibration device. Background Technology

[0002] A light-emitting diode (LED) is a semiconductor component widely used in indicator lights, displays, and other fields. Within a batch of LED components, the luminous intensity of each component will vary to some extent, generally following a normal distribution. Therefore, an LED testing machine is needed to detect the luminous intensity of LED components to screen out those with luminous intensities below or above the normal range.

[0003] Before testing LED components, the LED testing machine must be calibrated to ensure its accuracy. In existing technology, LED components are typically selected from the batch to be tested for calibration. Specifically, a set test voltage is input to the selected LED component in the LED testing machine, which acquires the luminous intensity of the LED component and records it as a reference value. During subsequent testing, the brightness of the tested LED component is compared with this reference value to determine whether the luminous intensity of the LED component is acceptable.

[0004] Ideally, the LED tester should be calibrated using an LED element whose luminous intensity corresponds to the vertex of the normal distribution curve. This would allow the tester to obtain the most accurate test results, resulting in better consistency in the luminous intensity of the qualified LED elements. However, the luminous intensity of the actually selected LED element may differ from the luminous intensity corresponding to the vertex of the normal distribution curve, leading to a decrease in the accuracy of the LED tester and consequently, a decrease in the consistency of the luminous intensity of the qualified LED elements. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide an LED testing machine calibration method, an LED testing standard sample tube, and an LED calibration device, so as to improve the accuracy of LED testing machine calibration and improve the consistency of the luminous intensity of qualified LED components.

[0006] In a first aspect, the present invention provides a method for calibrating an LED testing machine, comprising the following steps:

[0007] Provide an LED test standard sample tube, wherein the LED test standard sample tube includes a light-emitting unit with adjustable light intensity;

[0008] Multiple LED elements are selected within the batch to be tested, and the luminous intensity of each LED element is obtained when a set test voltage is input. The average luminous intensity of each LED element is then calculated.

[0009] The luminous intensity of the light-emitting unit of the LED test standard sample tube is adjusted to the average luminous intensity.

[0010] The LED testing machine is calibrated using the LED test standard sample tube.

[0011] Furthermore, the LED element includes multiple LED chips, and the LED test standard sample tube includes multiple light-emitting units with adjustable light intensity, with each light-emitting unit of the LED test standard sample tube corresponding to each LED chip of the LED element;

[0012] The process of obtaining the luminous intensity of each LED element when a set test voltage is input, and calculating the average luminous intensity of each LED element, specifically includes the following steps:

[0013] The luminous intensity of each LED chip on each LED element is obtained when a set test voltage is input, and the average luminous intensity of each corresponding LED chip on each LED element is calculated.

[0014] Adjusting the luminous intensity of the light-emitting unit of the LED test standard sample tube to the average luminous intensity specifically includes the following steps:

[0015] The luminous intensity of each light-emitting unit on the LED test standard sample tube is adjusted to the corresponding average luminous intensity.

[0016] Further, adjusting the luminous intensity of each light-emitting unit on the LED test standard sample tube to the corresponding average luminous intensity specifically includes the following steps:

[0017] According to the set lighting sequence parameters, the set test voltage is input to each of the light-emitting units on the LED test standard sample tube, and the luminous intensity of each light-emitting unit is obtained respectively.

[0018] The difference between the luminous intensity of each of the light-emitting units and the corresponding average luminous intensity is calculated, and the corresponding calibration parameters are calculated based on each difference.

[0019] The luminous intensity of each light-emitting unit is adjusted according to the corresponding calibration parameters so that the luminous intensity of each light-emitting unit is adjusted to the corresponding average luminous intensity when the set test voltage is input.

[0020] The calibration of the LED testing machine using the LED test standard sample tube specifically includes the following steps:

[0021] According to the set lighting sequence parameters, the set test voltage is input to each of the light-emitting units on the LED test standard sample tube respectively;

[0022] The LED testing machine acquires the luminous intensity of each of the light-emitting units and records the luminous intensity of each light-emitting unit as a corresponding reference value.

[0023] Secondly, the present invention provides an LED test standard sample tube, including a first controller and a light-emitting unit. The first controller is provided with a power input pin, a ground pin, an LED output pin, and a data input pin. The LED output pin is electrically connected to the light-emitting unit. The first controller is used to receive calibration parameters through the data input pin (SDI) and to calibrate the luminous intensity of the light-emitting unit according to the calibration parameters when a set test voltage is input through the power input pin.

[0024] Furthermore, the light-emitting unit includes multiple units, and the LED output pin includes multiple pins, with each light-emitting unit electrically connected to a corresponding LED output pin;

[0025] The first controller is also configured to receive lighting sequence parameters through the data input pin, and to control the lighting sequence of each light-emitting unit according to the lighting sequence parameters when a set test voltage is input to the power input pin.

[0026] Furthermore, the light-emitting unit includes a red light-emitting unit, a green light-emitting unit, and a blue light-emitting unit.

[0027] Furthermore, the positive terminal of each of the light-emitting units is electrically connected to the corresponding LED output pin, and the negative terminal of each of the light-emitting units is electrically connected to the ground pin.

[0028] Furthermore, the positive terminal of each of the light-emitting units is electrically connected to the power input pin, and the negative terminal of each of the light-emitting units is electrically connected to the corresponding LED output pin.

[0029] Furthermore, it also includes a substrate, on which the first controller and the light-emitting unit are disposed;

[0030] The substrate is also provided with a power input terminal, a ground terminal and a data input terminal, and the power input terminal and / or the ground terminal include multiple terminals, and each power input terminal and / or each ground terminal is electrically connected to the other terminals.

[0031] Each of the power input terminals is electrically connected to the power input pin of the first controller and each of the light-emitting units, each of the ground terminals is electrically connected to the ground pin of the first controller, and each of the data input terminals is electrically connected to the data input pin of the first controller.

[0032] Thirdly, the present invention provides an LED calibration device for calibrating the aforementioned LED test standard sample tube. The LED calibration device includes a second controller and a photosensitive element, wherein the photosensitive element is electrically connected to the second controller.

[0033] The second controller is used to acquire the luminous intensity of each LED chip of each selected LED element in the batch to be tested when the set test voltage is input through the photosensitive element, and calculate the average luminous intensity of each LED chip corresponding to different LED elements, and record them as the corresponding standard luminous intensity.

[0034] The second controller is also used to acquire the difference between the luminous intensity of each light-emitting unit of the LED test standard sample tube when the standard test voltage is input and the corresponding standard luminous intensity, and to calculate the corresponding calibration parameters based on each difference.

[0035] The second controller is also used to send each of the calibration parameters to the data input pin of the LED test standard sample tube.

[0036] Furthermore, the second controller is also used to send the set lighting sequence parameters to the data input pin of the LED test standard sample tube.

[0037] Compared with existing technologies, this invention selects multiple LED components from the batch to be tested, obtains the average luminous intensity of each selected LED component, and adjusts the luminous intensity of the LED test standard sample tube to match the average luminous intensity of the selected LED components. The LED test standard sample tube is then used to calibrate the LED testing machine. In this invention, by adjusting the luminous intensity of the LED test standard sample tube to the average luminous intensity of the selected multiple LED components, the luminous intensity used for calibrating the LED testing machine is closer to the luminous intensity corresponding to the vertex of the normal distribution curve of the luminous intensity of the LED components in the batch to be tested. This improves the accuracy of the LED testing machine and results in better consistency in the luminous intensity of LED components that pass the LED testing machine test. Attached Figure Description

[0038] Figure 1 This is a flowchart of an LED testing machine calibration method according to one embodiment of the present invention;

[0039] Figure 2This is a schematic diagram of the front structure of an existing LED element;

[0040] Figure 3 This is a schematic diagram of the back structure of an existing LED element;

[0041] Figure 4 This is a schematic diagram of the front structure of an LED test standard sample tube in one embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the back structure of an LED test standard sample tube in one embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the front structure of an existing LED element;

[0044] Figure 7 This is a schematic diagram of the back structure of an existing LED element;

[0045] Figure 8 This is a schematic diagram of the front structure of an LED test standard sample tube in one embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the back structure of an LED test standard sample tube in one embodiment of the present invention;

[0047] Figure 10 This is a schematic diagram showing the circuit connection between the LED test standard sample tube and the LED calibration equipment in one embodiment of the present invention;

[0048] Figure 11 This is a schematic diagram showing the circuit connection relationship between the LED element and the LED calibration device in one embodiment of the present invention.

[0049] In the picture:

[0050] 11. Substrate; VCC', power input terminal; GND', ground terminal; SDI', data input terminal;

[0051] 12. First controller; VCC, power input pin; GND, ground pin; SDI, data input pin; R0~R3, red LED output pins; G0~G3, green LED output pins; B0~B3, blue LED output pins;

[0052] 13. Light-emitting unit; 13R. Red light-emitting unit; 13G. Green light-emitting unit; 13B. Blue light-emitting unit;

[0053] 22. Second controller;

[0054] 23. Photosensitive element;

[0055] A, LED chip; R', red LED chip; G', green LED chip; B', blue LED chip. Detailed Implementation

[0056] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0057] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0059] To address the above technical problems, firstly, this application provides a calibration method for an LED testing machine, such as... Figure 1 As shown, the method includes the following steps:

[0060] S101. Provide an LED test standard sample tube, wherein the LED test standard sample tube includes a light-emitting unit 13 with adjustable light intensity;

[0061] S102. Select multiple LED elements within the batch to be tested, obtain the luminous intensity of each LED element when a set test voltage is input, and calculate the average luminous intensity of each LED element.

[0062] S103. Adjust the luminous intensity of the light-emitting unit 13 of the LED test standard sample tube to the average luminous intensity.

[0063] S104. Calibrate the LED testing machine using the LED test standard sample tube.

[0064] In this embodiment, a standard sample tube for LED testing is first provided, such as... Figure 4 or Figure 8As shown, the LED test standard sample tube includes an adjustable light-emitting unit 13. Then, multiple LED elements are selected from the batch to be tested, and the light intensity of each LED element is obtained when a set test voltage is input. The average light intensity of each LED element is then calculated. Subsequently, the light intensity of the light-emitting unit 13 of the LED test standard sample tube is adjusted to the calculated average light intensity. Finally, the LED test standard sample tube with adjusted light intensity is used to calibrate the LED tester.

[0065] In this embodiment, the luminous intensity of the LED test standard sample tube is adjusted to the average luminous intensity of multiple selected LED components. This makes the luminous intensity used to calibrate the LED tester closer to the luminous intensity corresponding to the vertex of the normal distribution curve of the luminous intensity of the LED components in the batch under test, thereby improving the accuracy of the LED tester and making the luminous intensity of qualified LED components more consistent.

[0066] like Figure 2 or Figure 6 As shown, the LED element to be tested has an LED chip A. The LED element emits light from the LED chip A. In order to increase the density of LED chips A and thus improve the display accuracy of the LED screen, multiple LED chips A are set on one LED element.

[0067] Therefore, based on the structure of the LED element described above, in a preferred embodiment, such as Figure 4 or Figure 8 As shown, the LED test standard sample tube includes multiple light-emitting units 13 with adjustable light intensity, and each light-emitting unit 13 of the LED test standard sample tube corresponds to each LED chip A of the LED element;

[0068] The step S102 above, which involves obtaining the luminous intensity of each LED element when a set test voltage is input and calculating the average luminous intensity of each LED element, specifically includes the following steps:

[0069] S1021. Obtain the luminous intensity of each LED chip A on each LED element when a set test voltage is input, and calculate the average luminous intensity of each corresponding LED chip A on each LED element.

[0070] Step S103, which involves adjusting the luminous intensity of the light-emitting unit 13 of the LED test standard sample tube to the average luminous intensity, specifically includes the following steps:

[0071] S1031. Adjust the luminous intensity of each of the light-emitting units 13 on the LED test standard sample tube to the corresponding average luminous intensity.

[0072] In this embodiment, the LED element is provided with multiple LED chips A, and the LED test standard sample tube is provided with multiple light-emitting units 13. Each light-emitting unit 13 on the LED test standard sample tube corresponds to each LED chip A on the LED element. Specifically, the multiple LED chips A on the LED element may include multiple LED chips of different colors, or multiple LED chips of different rated power; each light-emitting unit 13 on the LED test standard sample tube has the same color as the corresponding LED chip A on the LED element.

[0073] Based on the structure of the LED components and LED test standard sample tube described above, firstly, the luminous intensity of each selected LED component should be tested to obtain the luminous intensity of each LED chip A on each LED component when the set test voltage is input, and the average luminous intensity of the corresponding LED chip A on each different LED component should be calculated. Then, the luminous intensity of each light-emitting unit 13 on the LED test standard sample tube should be adjusted to the corresponding average luminous intensity. Finally, the adjusted LED sample tube should be used to calibrate the LED tester.

[0074] In one exemplary embodiment, such as Figure 2 As shown, the LED component has one red LED chip R', one green LED chip G', and one blue LED chip B', corresponding to which are, as follows: Figure 4 As shown, the LED test standard sample tube is equipped with one red light-emitting unit 13R, one green light-emitting unit 13G, and one blue light-emitting unit 13B. First, the luminous intensity of each selected LED element should be tested. The luminous intensity of the red LED chip R', green LED chip G', and blue LED chip B' of each LED element should be obtained when a set test voltage is input. The average luminous intensity of each of the red LED chip R', green LED chip G', and blue LED chip B' on each of the different LED elements should be calculated to obtain the average red luminous intensity, the average green luminous intensity, and the average blue luminous intensity. Then, the luminous intensity of the red light-emitting unit 13R on the LED test standard sample tube should be adjusted to the calculated average red luminous intensity, the luminous intensity of the green light-emitting unit 13G on the LED test standard sample tube should be adjusted to the calculated average green luminous intensity, and the luminous intensity of the blue light-emitting unit 13B on the LED test standard sample tube should be adjusted to the calculated average blue luminous intensity. Finally, the adjusted LED sample tube is used to calibrate the LED testing machine.

[0075] Since the LED component to be tested has multiple LED chips A, the LED testing machine needs to be calibrated for different LED chips A. Therefore, in a preferred embodiment, the calibration of the LED testing machine using the LED test standard sample tube in step S104 specifically includes the following steps:

[0076] S1041: According to the set lighting sequence parameters, the set test voltage is input to each of the light-emitting units 13 on the LED test standard sample tube respectively;

[0077] S1042: The LED testing machine acquires the luminous intensity of each of the light-emitting units and records the luminous intensity of each of the light-emitting units as a corresponding reference value.

[0078] In this embodiment, the lighting sequence of each light-emitting unit 13 on the LED test standard sample tube is set. When calibrating the LED tester using the LED test standard sample tube, the set test voltage is input to each light-emitting unit 13 on the LED test standard sample tube according to the set lighting sequence parameters. At the same time, the LED tester obtains the luminous intensity of each light-emitting unit 13 according to the set lighting sequence parameters and records it as the corresponding reference value. In the subsequent testing process of the LED component, the LED tester can determine whether the luminous intensity of the LED component is qualified based on the corresponding reference value.

[0079] In one exemplary embodiment, such as Figure 2 As shown, the LED component has one red LED chip R', one green LED chip G', and one blue LED chip B', corresponding to which are, as follows: Figure 3As shown, the LED test standard sample tube is equipped with one red light-emitting unit 13R, one green light-emitting unit 13G, and one blue light-emitting unit 13B. The set lighting sequence parameters are: the light-emitting units 13 on the LED test standard sample tube are lit sequentially in the order of red, green, and blue. The lighting duration of each light-emitting unit 13 is the first set duration, and the time interval between the lighting of the next light-emitting unit 13 and the extinguishing of the previous light-emitting unit 13 is the second set duration. Therefore, the calibration process of the LED test equipment specifically includes the following steps: ① Apply the set test voltage to the red light-emitting unit 13R, and then... ① The power-on duration is the first set duration. During this period, the LED tester acquires the luminous intensity of the red light-emitting unit 13R and records it as the red luminous intensity reference value; ② The set test voltage is applied to the green light-emitting unit 13G for the first set duration. During this period, the LED tester acquires the luminous intensity of the green light-emitting unit 13G and records it as the green luminous intensity reference value; ③ The set test voltage is applied to the blue light-emitting unit 13B for the first set duration. During this period, the LED tester acquires the luminous intensity of the blue light-emitting unit 13B and records it as the blue luminous intensity reference value.

[0080] In a preferred embodiment, the step S1031 above, which involves adjusting the luminous intensity of each light-emitting unit on the LED test standard sample tube to the corresponding average luminous intensity, specifically includes the following steps:

[0081] S10311: According to the set lighting sequence parameters, the set test voltage is input to each of the light-emitting units 13 on the LED test standard sample tube, and the light intensity of each light-emitting unit 13 is obtained respectively.

[0082] S10312: Calculate the difference between the luminous intensity of each of the light-emitting units 13 and the corresponding average luminous intensity, and calculate the corresponding calibration parameters based on each difference;

[0083] S10313: Adjust the luminous intensity of each of the light-emitting units 13 according to the corresponding calibration parameters, so that the luminous intensity of each of the light-emitting units 13 is adjusted to the corresponding average luminous intensity when the set test voltage is input.

[0084] In this embodiment, adjusting the luminous intensity of each light-emitting unit 13 on the LED test standard sample tube to the corresponding average luminous intensity includes the following steps: First, according to the set lighting sequence parameters, the set test voltage is input to each light-emitting unit 13 on the LED test standard sample tube, and the luminous intensity of each light-emitting unit 13 is obtained respectively; then, the difference between the luminous intensity of each light-emitting unit 13 and the corresponding average luminous intensity is calculated, and the corresponding calibration parameters are calculated based on the differences; finally, the luminous intensity of each light-emitting unit is adjusted according to the corresponding calibration parameters so that the luminous intensity of each light-emitting unit when the set test voltage is input is adjusted to the corresponding average luminous intensity. Therefore, in this embodiment, the intensity of each light-emitting unit 13 on the LED test standard sample tube is adjusted. When acquiring the brightness of each light-emitting unit 13 on each LED test standard sample tube, a set test voltage is input to each light-emitting unit 13 on the LED test standard sample tube according to a set lighting sequence parameter, and the luminous intensity of each light-emitting unit 13 is acquired according to the set lighting sequence parameter, thereby avoiding errors in the acquired luminous intensity of each light-emitting unit 13. Specifically, a correspondence between the luminous intensity of each light-emitting unit 13 and the corresponding average luminous intensity, and calibration parameters can be established in advance. Therefore, after calculating the difference between the luminous intensity of each light-emitting unit 13 and the corresponding average luminous intensity, the corresponding calibration parameters can be obtained through this correspondence.

[0085] In one exemplary embodiment, such as Figure 2 As shown, the LED component has one red LED chip R', one green LED chip G', and one blue LED chip B'. Correspondingly, as shown in Figure 4, the LED test standard sample tube has one red light-emitting unit 13R, one green light-emitting unit 13G, and one blue light-emitting unit 13B. The set lighting sequence parameters are: each light-emitting unit 13 on the LED test standard sample tube is lit in the order of red, green, and blue. The lighting duration of each light-emitting unit 13 is the first set duration, and the time interval between the lighting of the next light-emitting unit 13 and the extinguishing of the previous light-emitting unit 13 is the second set duration.

[0086] Therefore, the specific procedures for obtaining each calibration parameter include the following: ① Applying a set test voltage to the red light-emitting unit 13R for a first set duration, and during this period, acquiring the luminous intensity of the red light-emitting unit 13R; calculating the difference between the luminous intensity of the red light-emitting unit 13R and the average red luminous intensity to obtain the red luminous intensity difference value, and calculating the red calibration parameter based on the red luminous intensity difference value. ② Applying a set test voltage to the green light-emitting unit 13G for a first set duration, and during this period, acquiring the luminous intensity of the green light-emitting unit 13G; calculating the difference between the luminous intensity of the green light-emitting unit 13G and the average green luminous intensity to obtain the green luminous intensity difference value, and calculating the green calibration parameter based on the green luminous intensity difference value. ③ Apply the set test voltage to the blue light-emitting unit 13B for a set duration, and during this period, obtain the luminous intensity of the blue light-emitting unit 13B; calculate the difference between the luminous intensity of the blue light-emitting unit 13B and the average blue luminous intensity to obtain the blue luminous intensity difference value, and calculate the blue calibration parameter based on the blue luminous intensity difference value. Therefore, the luminous intensity of the red light-emitting unit 13R, the green light-emitting unit 13G, and the blue light-emitting unit 13B can be calibrated using the red calibration parameter, the green calibration parameter, and the blue calibration parameter, respectively.

[0087] In a preferred embodiment, the maximum luminous intensity of each light-emitting unit 13 on the LED test standard sample tube is greater than the maximum luminous intensity of the corresponding LED chip A on the LED element, thereby increasing the luminous intensity adjustment range of each light-emitting unit 13 on the LED test standard sample tube and preventing the luminous intensity of each LED chip A on the LED element from exceeding the luminous intensity adjustment range of the corresponding light-emitting unit 13 on the LED test standard sample tube when the set test voltage is input.

[0088] Furthermore, under the same input test voltage, the luminous intensity of each light-emitting unit 13 on the LED test standard sample tube is greater than the luminous intensity of the corresponding LED chip A on the LED element. In order to adjust the luminous intensity of the light-emitting unit 13 on the LED test standard sample tube to the average brightness of the corresponding LED chip A on the LED element, it is necessary to reduce the luminous intensity of the light-emitting unit 13 on the LED test standard sample tube. Therefore, in a preferred embodiment, the set test voltage is pulse-width modulated (PWM), and the modulated test voltage is sent to the corresponding light-emitting unit 13, thereby adjusting the luminous intensity of the light-emitting unit 13. Specifically, the larger the duty cycle of the pulse-width modulation, the smaller the luminous intensity of the light-emitting unit 13; when the duty cycle of the pulse-width modulation is 0, the set test voltage is directly sent to the light-emitting unit 13, and the luminous intensity of the light-emitting unit 13 is at its maximum. Thus, the luminous intensity of the light-emitting unit 13 can be reduced and adjusted by pulse-width modulation.

[0089] Secondly, this application also provides an LED test standard sample tube for calibrating an LED tester, such as... Figure 4 As shown, the LED test standard sample tube includes a first controller 12 and a light-emitting unit 13. The first controller 12 is provided with a power input pin VCC, a ground pin GND, an LED output pin, and a data input pin SDI. The LED output pin is electrically connected to the light-emitting unit 13. The first controller 12 is used to receive calibration parameters through the data input pin SDI, and to adjust the light intensity of the light-emitting unit 13 according to the calibration parameters when a set test voltage is input to the power input pin VCC.

[0090] In a preferred embodiment, such as Figure 4 As shown, the light-emitting unit 13 includes multiple units, and the LED output pins include multiple units. Each light-emitting unit 13 is electrically connected to the corresponding LED output pin. The first controller 12 is also used to receive lighting sequence parameters through the data input pin SDI, and to control the lighting sequence of each LED chip according to the lighting sequence parameters when the set test voltage is input to the power output pin VCC.

[0091] In practical applications, to achieve color display, a single LED element typically contains red, green, and blue LED chips. By adjusting the ratio of the luminous intensities of these chips, the LED element can emit different colors of light. Therefore, to calibrate the LED testing machine using standard LED test tubes before testing the aforementioned color display LED element, in a preferred embodiment, as shown... Figure 4As shown, the light-emitting unit 13 includes a red light-emitting unit 13R, a green light-emitting unit 13G, and a blue light-emitting unit 13B.

[0092] In a preferred embodiment, to facilitate fixing the first controller 12 and each light-emitting unit on the LED test standard sample tube, such as... Figure 3 As shown, the LED test standard sample tube also includes a substrate 11, a first controller 12, and each light-emitting unit 13 disposed on the substrate 11.

[0093] In a preferred embodiment, the substrate 11 is further included, and the first controller 12 and the light-emitting unit 13 are disposed on the substrate 11. The substrate 11 is also provided with a power input terminal VCC', a ground terminal GND' and a data input terminal SDI'. The power input terminal VCC' and / or the ground terminal GND' include multiple terminals, and each power input terminal VCC' and / or each ground terminal GND' is electrically connected to each other.

[0094] Each power input terminal VCC' is electrically connected to the power input pin VCC of the first controller 12 and each light-emitting unit 13. Each ground terminal GND' is electrically connected to the ground pin GND of the first controller 12. The data input terminal SDI' is electrically connected to the data input pin SDI of the first controller 12. Therefore, the LED test standard sample tube can be electrically connected to the LED tester through multiple power input terminals VCC' and / or multiple ground terminals GND' to prevent poor contact and improve the stability of the electrical connection.

[0095] In one optional embodiment, the positive terminal of each light-emitting unit 13 is electrically connected to the corresponding LED output pin, and the negative terminal of each light-emitting unit 13 is connected to the ground pin GND; in other embodiments, the positive terminal of each light-emitting unit 13 is electrically connected to the power input pin VCC, and the negative terminal of each light-emitting unit 13 is electrically connected to the corresponding LED output pin.

[0096] like Figure 2 and Figure 3 As shown, Figure 2 and Figure 3 This is a structural diagram of the front and back of a single-pixel LED element. The front of the single-pixel LED element has one red LED chip R', one green LED chip G', and one blue LED chip B'. The red LED chip R', the green LED chip G', and the blue LED chip B' are combined to form a pixel. The color of the pixel can be adjusted by adjusting the ratio of the light intensity of each LED chip.

[0097] The back of the single-pixel LED element has connection terminals R+, G+, B+, and C-. Connection terminals R+, G+, and B+ are electrically connected to the positive terminals of the red LED chip R', green LED chip G', and blue LED chip B', respectively. The negative terminals of the red LED chip R', green LED chip G', and blue LED chip B' are all electrically connected to connection terminal C-. Specifically, the front and back of the single-pixel LED element can be electrically connected through vias. The vias can be formed by mechanical drilling and then copper plating inside the holes, or by laser drilling and then copper plating inside the holes.

[0098] When the single-pixel LED element is working normally, or during testing by an LED testing machine, the corresponding LED chip can be lit by inputting and outputting current through the corresponding connection terminals on the back of the single-pixel LED element. For example, when the red LED chip R' needs to be lit, current is input from connection terminal R+ and output from connection terminal C-. To facilitate electrical connection between the single-pixel LED element and the testing machine for testing, the testing machine is equipped with a mounting base. After the single-pixel LED element is installed on the mounting base, it can be electrically connected to the testing machine through the mounting base.

[0099] Regarding the aforementioned single-pixel LED element, in an exemplary embodiment, such as Figure 4 and Figure 5As shown, the LED test standard sample tube's light-emitting unit 13 includes one red light-emitting unit 13R, one green light-emitting unit 13G, and one blue light-emitting unit 13B. The LED output pins of the first controller 12 include R0, G0, and B0 pins. Each LED output pin is electrically connected to the red light-emitting unit 13R, the green light-emitting unit 13G, and the blue light-emitting unit 13B, respectively. Each light-emitting unit 13 corresponds to each LED chip A on the aforementioned single-pixel LED element. The first controller 12 and each light-emitting unit 13 are both disposed on the front side of the substrate 11. The back side of the substrate 11 also has a power input terminal VCC', a ground terminal GND', and a data input terminal SDI'. Specifically, the power input terminal VCC' is electrically connected to the power input pin VCC, the ground terminal GND' is electrically connected to the ground pin GND, and the data input terminal SDI' is electrically connected to the data input pin. The LED test standard sample tube is electrically connected to external devices through the power input terminal VCC', the ground terminal GND', and the data input terminal SDI'. The power input terminal VCC' includes three terminals, whose positions correspond to the connection terminals R+, G+, and B+ on the aforementioned single-pixel LED element, respectively. The ground terminal GND' is located corresponding to the connection terminal C- on the aforementioned single-pixel LED element. Therefore, the structure on the back of the LED test standard sample tube in this embodiment is basically the same as the structure on the back of the aforementioned single-pixel LED element. The LED test standard sample tube in this embodiment can be installed on the mounting base of the testing machine for installing the aforementioned single-pixel LED element to realize the electrical connection between the LED test standard sample tube and the LED testing machine, thereby facilitating the calibration of the LED testing machine using the LED test standard sample tube.

[0100] Preferably, the power input terminals VCC' are electrically connected to each other to improve the stability of the electrical connection between the power input terminals VCC' and the LED tester, preventing poor contact from affecting the calibration results. Specifically, such as... Figure 4 and Figure 5 As shown, the positive terminal of each light-emitting unit 13 is electrically connected to the power input terminal VCC' of the first controller 12, and the line connecting the positive terminal of each light-emitting unit 13 to the power input terminal VCC' of the first controller 12 is electrically connected to each power input terminal VCC' through a through hole.

[0101] like Figure 6 and Figure 7 As shown, Figure 6 and Figure 7This is a structural diagram of the front and back of a four-in-one LED element. The front of the four-in-one LED element has four red LED chips R', four green LED chips G', and four blue LED chips B'. One red LED chip R', one green LED chip G', and one blue LED chip B' are combined to form a pixel. Thus, four pixels are combined to form a pixel. The light emission color of the pixel can be adjusted by adjusting the ratio of the light emission intensity of each LED chip A in each pixel.

[0102] The back of this four-in-one LED element has connection terminals R13-, G13-, B13-, R24-, G24-, B24-, C12+, and C34. Connection terminal R13- is electrically connected to the negative electrode of the red LED chip R' in the first and third pixels. Connection terminal G13- is electrically connected to the negative electrode of the green LED chip G' in the first and third pixels. Connection terminal B13- is electrically connected to the negative electrode of the blue LED chip G' in the first and third pixels. Connection terminal R24- is electrically connected to the negative electrode of the red LED chip R' in the second and fourth pixels. Connection terminal G24- is electrically connected to the negative electrode of the green LED chip G' in the second and fourth pixels. Connection terminal B24- is electrically connected to the negative electrode of the blue LED chip B' in the second and fourth pixels. Connection terminal C12+ is electrically connected to the positive electrode of each LED chip A in the first and second pixels. Connection terminal C34+ is electrically connected to the positive electrode of each LED chip A in the third and fourth pixels.

[0103] When the four-in-one LED element is working normally, or during testing by an LED tester, the corresponding LED chip A can be lit by inputting and outputting current through the corresponding connection terminals on the back of the four-in-one LED element. For example, when the red LED chip R' in the first pixel needs to be lit, current is input from connection terminal C12+ and output from connection terminal R13-. To facilitate electrical connection between the four-in-one LED element and the LED tester for testing, the LED tester is equipped with a corresponding mounting bracket. After the four-in-one LED element is installed on the mounting bracket, it can be electrically connected to the LED tester through the mounting bracket.

[0104] In another exemplary embodiment of the aforementioned four-in-one LED element, such as... Figure 6 and Figure 7As shown, the light-emitting unit 13 includes four red light-emitting units 13R, four green light-emitting units 13G, and four blue light-emitting units 13B. The LED output pins of the first controller 12 include R0~R3, G0~G3, and B0~B3 pins. Each LED output pin is electrically connected to each red light-emitting unit 13R, each green light-emitting unit 13G, and each blue light-emitting unit 13B, respectively. Each light-emitting unit 13 corresponds to each LED chip A on the above-mentioned four-in-one LED element. The first controller 12 and each light-emitting unit 13 are both disposed on the front side of the substrate 11. The back side of the substrate 11 also has a power input terminal VCC', a ground terminal GND', and a data input terminal SDI'. Specifically, the power input terminal VCC' is electrically connected to the power input pin VCC, the ground terminal GND' is electrically connected to the ground pin GND, and the data input terminal SDI' is electrically connected to the data input pin. The LED test standard sample tube is electrically connected to external devices through the power input terminal VCC', the ground terminal GND', and the data input terminal SDI'. The power input terminal VCC' includes two terminals, whose positions correspond to the connection terminals C12+ and C34+ on the aforementioned four-in-one LED element, respectively. The ground terminal GND' includes six terminals, whose positions correspond to the connection terminals R13-, G13-, B13- and R24-, G24-, B24- on the aforementioned four-in-one LED element, respectively. Thus, the structure on the back of the LED test standard sample tube in this embodiment is basically the same as the structure on the back of the aforementioned four-in-one LED element. The LED test standard sample tube in this embodiment can be installed on the mounting base for installing the aforementioned four-in-one LED element on the LED tester to realize the electrical connection between the LED test standard sample tube and the LED tester, thereby facilitating the calibration of the LED tester using the LED test standard sample tube.

[0105] Preferably, the power input terminals VCC' are electrically connected to each other, and the ground terminals GND' are electrically connected to each other to improve the stability of the electrical connection between the power input terminals VCC' and GND' and the LED tester, preventing poor contact from affecting the calibration results. Specifically, such as Figure 8 and Figure 9 As shown, the positive terminal of each light-emitting unit 13 is electrically connected to the power input terminal VCC' of the first controller 12. The line connecting the positive terminal of each light-emitting unit 13 to the power input terminal VCC' of the first controller 12 is electrically connected to each power input terminal VCC' through a through hole. Each ground terminal GND' is electrically connected to each other on the back of the LED test standard sample tube.

[0106] Thirdly, this application provides an LED calibration device for calibrating LED test standard sample tubes comprising multiple light-emitting units, such as... Figure 10As shown, the LED calibration device includes a second controller 22 and a photosensitive element 23, which is electrically connected to the second controller 22. The second controller 22 is used to acquire the luminous intensity of each LED chip A of each selected LED element in the batch to be tested when a set test voltage is input, through the photosensitive element 23, and to calculate the average luminous intensity of each LED chip A on different LED elements, and record them as the corresponding standard luminous intensity. The second controller 22 is also used to acquire the difference between the luminous intensity of each light-emitting unit 13 of the LED test standard sample tube when a standard test voltage is input and the corresponding standard luminous intensity, and to calculate the corresponding calibration parameters based on each difference. The second controller 22 is also used to send each calibration parameter to the data input pin SDI of the LED test standard sample tube.

[0107] In a preferred embodiment, the second controller 22 is also used to send the set lighting sequence parameters to the data input pin of the LED test standard sample tube.

[0108] The following examples detail the process of calibrating an LED tester using the LED test standard sample tube and LED calibration equipment of this application. The technical solutions of this application are not limited to the following examples.

[0109] In an exemplary process, such as Figure 2 As shown, the LED component to be tested has one red LED chip R', one green LED chip G', and one blue LED chip B', corresponding to which are, as follows: Figure 3 As shown, the LED test standard sample tube is provided with one red light-emitting unit 13R, one green light-emitting unit 13G and one blue light-emitting unit 13B; each light-emitting unit 13 is electrically connected to the corresponding LED output pin of the first controller 12; the LED calibration equipment includes a second controller 22 and a photosensitive element 23, and the second controller 22 is electrically connected to the photosensitive element 23.

[0110] This exemplary process includes the following steps:

[0111] S201. Obtain the average luminous intensity of the LED component under test;

[0112] S202. The LED test standard sample tube is calibrated based on the average luminous intensity of the LED element to be tested.

[0113] S203. Use LED test standard sample tubes to calibrate the LED tester.

[0114] The above step S201 specifically includes the following sub-steps:

[0115] S2011. Select multiple LED components from the batch to be tested;

[0116] S2012, such as Figure 11 As shown, the selected LED components are connected to the second controller 22 of the LED calibration device in sequence. The second controller outputs the set test voltage to the red LED chip R', green LED chip G' and blue LED chip B' of the connected LED components according to the set lighting sequence parameters, and obtains the luminous intensity of the red LED chip R', green LED chip G' and blue LED chip B' through the photosensitive element 23.

[0117] S2013. Calculate the average luminous intensity of each red LED chip R', green LED chip G', and blue LED chip B' to obtain the average luminous intensity of red, green, and blue LED chips.

[0118] The above step S202 specifically includes the following sub-steps:

[0119] S2021, such as Figure 10 As shown, the power input pin VCC of the LED test standard sample tube is connected to the set test voltage, and the data input pin SDI of the LED test standard sample tube is electrically connected to the second controller 22 of the LED calibration equipment.

[0120] S2022, the second controller 22 of the LED calibration equipment sends the lighting sequence parameters to the first controller 12 of the LED test standard sample tube through the data input pin SDI, and the first controller 12 stores the lighting sequence parameters.

[0121] S2023, the first controller 12, according to the received lighting sequence parameters, sequentially sends the set test current input at the power input pin VCC to the red light-emitting unit 13R, the green light-emitting unit 13G and the blue light-emitting unit 13B.

[0122] S2024. While performing the above step S2024, the second controller 22 of the LED calibration device obtains the luminous intensity of the red light-emitting unit 13R, the green light-emitting unit 13G and the blue light-emitting unit 13B through the photosensitive element 13B respectively.

[0123] S2025, the second controller 22 of the LED calibration device calculates the difference between the luminous intensity of the red luminous unit 13R, green luminous unit 13G and blue luminous unit 13B and the corresponding average values ​​of red luminous intensity, green luminous intensity and blue luminous intensity, and obtains the difference in red luminous intensity, green luminous intensity and blue luminous intensity.

[0124] S2026, the second controller 22 of the LED calibration device obtains the corresponding red calibration parameters, green calibration parameters and blue calibration parameters according to the calculated red light intensity difference, green light intensity difference and blue light intensity difference, and sends them to the first controller 12 of the LED sample tube through the data input pin SDI; the first controller 12 stores the received red calibration parameters, green calibration parameters and blue calibration parameters.

[0125] The above step S203 specifically includes the following sub-steps:

[0126] S2031. Input the standard test voltage to the power input pin VCC of the LED test standard sample tube;

[0127] S2032, the first controller 12 adjusts the standard test voltage according to the red calibration parameter, green calibration parameter and blue calibration parameter respectively, and sends the adjusted standard test voltage to the corresponding red light-emitting unit 13R, green light-emitting unit 13G and blue light-emitting unit 13B in sequence according to the lighting sequence parameter, so that the light intensity of the red light-emitting unit 13R, green light-emitting unit 13G and blue light-emitting unit 13B is close to or equal to the corresponding average red light intensity, average green light intensity and average blue light intensity.

[0128] S2033. Simultaneously, the LED testing machine acquires the luminous intensity of the red light-emitting unit 13R, the green light-emitting unit 13G, and the blue light-emitting unit 13B, and records them as corresponding reference values. During the subsequent testing of the LED components, the LED testing machine determines whether the LED components are qualified based on the recorded reference values.

[0129] Compared with existing technologies, this invention selects multiple LED components from the batch to be tested, obtains the average luminous intensity of each selected LED component, and adjusts the luminous intensity of the LED test standard sample tube to match the average luminous intensity of the selected LED components. The LED test standard sample tube is then used to calibrate the LED testing machine. In this invention, by adjusting the luminous intensity of the LED test standard sample tube to the average luminous intensity of the selected multiple LED components, the luminous intensity used for calibrating the LED testing machine is closer to the luminous intensity corresponding to the vertex of the normal distribution curve of the luminous intensity of the LED components in the batch to be tested. This improves the accuracy of the LED testing machine and results in better consistency in the luminous intensity of LED components that pass the LED testing machine test.

[0130] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A calibration method for an LED testing machine, comprising the following steps: An LED test standard sample tube is provided, which includes multiple light-emitting units (13) with adjustable light intensity and a first controller (12). The first controller (12) is provided with a power input pin (VCC), a ground pin (GND), multiple LED output pins and a data input pin (SDI). Each LED output pin is electrically connected to the corresponding light-emitting unit (13). The first controller (12) is used to receive calibration parameters through the data input pin (SDI) and to calibrate the light intensity of the light-emitting unit (13) according to the calibration parameters when a set test voltage is input to the power input pin (VCC). Multiple LED elements are selected within the batch to be tested. Each LED element includes multiple LED chips (A). Each light-emitting unit (13) of the LED test standard sample tube corresponds to each LED chip (A) of the LED element. The luminous intensity of each LED chip (A) on each LED element is obtained when a set test voltage is input, and the average luminous intensity of each corresponding LED chip (A) on different LED elements is calculated. The luminous intensity of each of the light-emitting units (13) on the LED test standard sample tube is adjusted to the corresponding average luminous intensity. The LED testing machine is calibrated using the LED test standard sample tube.

2. The LED testing machine calibration method according to claim 1, characterized in that: The step of adjusting the luminous intensity of each light-emitting unit (13) on the LED test standard sample tube to the corresponding average luminous intensity specifically includes the following steps: According to the set lighting sequence parameters, the set test voltage is input to each of the light-emitting units (13) on the LED test standard sample tube, and the light intensity of each light-emitting unit (13) is obtained respectively. The difference between the luminous intensity of each of the light-emitting units (13) and the corresponding average luminous intensity is calculated, and the corresponding calibration parameters are calculated based on each difference. The luminous intensity of each of the light-emitting units (13) is adjusted according to the corresponding calibration parameters so that the luminous intensity of each of the light-emitting units (13) is adjusted to the corresponding average luminous intensity when the set test voltage is input. The calibration of the LED testing machine using the LED test standard sample tube specifically includes the following steps: According to the set lighting sequence parameters, the set test voltage is input to each of the light-emitting units (13) on the LED test standard sample tube. The LED testing machine acquires the luminous intensity of each of the light-emitting units (13) and records the luminous intensity of each of the light-emitting units (13) as a corresponding reference value.

3. The LED testing machine calibration method according to claim 1, characterized in that: The first controller (12) is also used to receive lighting sequence parameters through the data input pin (SDI), and to control the lighting sequence of each light-emitting unit (13) according to the lighting sequence parameters when a set test voltage is input through the power input pin (VCC).

4. The LED testing machine calibration method according to claim 3, characterized in that: The light-emitting unit (13) includes a red light-emitting unit (13R), a green light-emitting unit (13G), and a blue light-emitting unit (13B).

5. The LED testing machine calibration method according to claim 3, characterized in that: The positive terminal of each of the light-emitting units (13) is electrically connected to the corresponding LED output pin, and the negative terminal of each of the light-emitting units (13) is electrically connected to the ground pin (GND).

6. The LED testing machine calibration method according to claim 3, characterized in that: The positive terminal of each of the light-emitting units (13) is electrically connected to the power input pin (VCC), and the negative terminal of each of the light-emitting units (13) is electrically connected to the corresponding LED output pin.

7. The LED testing machine calibration method according to claim 1, characterized in that: It also includes a substrate (11), on which the first controller (12) and the light-emitting unit (13) are disposed; The substrate (11) is also provided with a power input terminal (VCC'), a ground terminal (GND') and a data input terminal (SDI'), wherein the power input terminal (VCC') and / or the ground terminal (GND') include multiple terminals, and each power input terminal (VCC') and / or each ground terminal (GND') is electrically connected to each other. Each of the power input terminals (VCC') is electrically connected to the power input pin (VCC) of the first controller (12) and each of the light-emitting units (13), each of the ground terminals (GND') is electrically connected to the ground pin (GND) of the first controller (12), and each of the data input terminals (SDI') is electrically connected to the data input pin (SDI) of the first controller (12).

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