Shorting bar output voltage calibration method and apparatus, storage medium

Abstract

The application provides a Shorting Bar output voltage calibration method, comprising: transmitting a voltage control parameter to a Shorting Bar, the voltage control parameter being used to indicate that an output end of the Shorting Bar outputs a plurality of expected voltage values different from each other in a plurality of continuous first time periods; when the Shorting Bar outputs a voltage signal from the output end in response to the voltage control parameter, controlling an oscilloscope to collect a measured voltage value of the output end every second time period; comparing each expected voltage value in the plurality of expected voltage values with a plurality of measured voltage values corresponding to the expected voltage value; if a comparison result does not satisfy a set condition, adjusting the voltage control parameter, and repeating the above steps until the comparison result satisfies the set condition.

Description

[0001] This application is a divisional application of the invention entitled “Shorting Bar Output Voltage Calibration Method and Device, Storage Medium”, filed with the Chinese Patent Office on April 27, 2023, with application number 202310464588.5. Technical Field

[0002] This application relates to the field of display screen dot detection technology, and in particular to a method and device for calibrating the output voltage of a Shorting Bar, and a storage medium. Background Technology

[0003] After the initial molding of an OLED cell (OLED bare glass) panel, the driver chip has not yet been bonded, and it needs to be tested using corresponding testing equipment. A shortening bar (probe-based signal tester) is an analog signal generator that produces voltage waveform signals. It consists of an FPGA (Field-Programmable Gate Array), a digital-to-analog converter (DAC), and a power amplifier connected in sequence, specifically designed for testing OLED cell panels. During testing, the probes of the shortening bar are pressed onto the contacts of each branch of the OLED cell panel, and a voltage waveform signal is output to each branch. When the signal passes through a specific line, the organic materials (OLEDs) emit light, thus achieving the testing purpose.

[0004] However, due to system noise, component aging, and wire resistance in the electronic components inside the Shortening Bar, the actual output voltage value may deviate from the theoretical setting value. Without calibration, the output voltage error may be as high as 500mV.

[0005] One disclosed voltage calibration method for a shortening bar mainly calculates calibration parameters by fitting a straight line using the least squares method. However, due to the large output voltage range of the shortening bar, the high accuracy requirement, and the fact that the value of the internal AD register of the shortening bar is not a simple linear relationship with the actual output voltage value, there are nonlinear voltage change ranges in the high voltage range (e.g., 38V-44V) and the low voltage range (e.g., -38V-(-44V)). If this method is used, the accuracy requirements cannot be met within the nonlinear voltage output range. Summary of the Invention

[0006] In view of this, this application proposes a method, apparatus, and storage medium for calibrating the output voltage of a Shorting Bar, so as to improve the calibration accuracy and efficiency of the output voltage of the Shorting Bar.

[0007] In a first aspect, this application proposes a method for calibrating the output voltage of a Shorting Bar, wherein the Shorting Bar is used to illuminate an OLED cell panel, the method comprising:

[0008] A voltage control parameter is transmitted to the Shorting Bar, the voltage control parameter being used to instruct the output of the Shorting Bar to output multiple different expected voltage values ​​in multiple consecutive first time periods;

[0009] When the Shorting Bar outputs a voltage signal from the output terminal in response to the voltage control parameter, the oscilloscope is controlled to acquire the measured voltage value of the output terminal once every second time period, wherein the first time period is N times the second time period, and N is not less than 5;

[0010] Each of the plurality of expected voltage values ​​is compared with the plurality of measured voltage values ​​corresponding to that expected voltage value;

[0011] If the comparison result does not meet the set conditions, the voltage control parameters are adjusted, and the above steps are repeated until the comparison result meets the set conditions.

[0012] In some possible implementations, comparing each of the plurality of expected voltage values ​​with the plurality of measured voltage values ​​corresponding to that expected voltage value includes:

[0013] Each of the plurality of expected voltage values ​​is compared with at least three of the measured voltage values ​​corresponding to that expected voltage value;

[0014] Among them, at least two of the at least four measured voltage values ​​were acquired within the first 20 μs of the corresponding first time period;

[0015] Among them, at least two of the at least four measured voltage values ​​are acquired within the last 20 μs of the corresponding first time period.

[0016] In some possible implementations, the first time point and the second time point are the two endpoints of the first time period.

[0017] In some possible implementations, the setting condition includes: the difference between each of the at least four measured voltage values ​​and the expected voltage value does not exceed a set threshold range.

[0018] In some possible implementations, comparing each of the plurality of expected voltage values ​​with the plurality of measured voltage values ​​corresponding to that expected voltage value includes:

[0019] Each of the plurality of expected voltage values ​​is compared with all the measured voltage values ​​corresponding to that expected voltage value;

[0020] The set conditions include: the difference between each expected voltage value and each corresponding measured voltage value does not exceed a set threshold range.

[0021] In some possible implementations, the first time period is the minimum step time of the Shortening Bar, and N is an integer not less than 10.

[0022] In some possible implementations, adjusting the voltage control parameters if the comparison result does not meet the set conditions includes:

[0023] If the comparison result corresponding to the first expected voltage value meets the set conditions, and the comparison result corresponding to the second expected voltage value does not meet the set conditions, then the parameter part corresponding to the first expected voltage value in the voltage control parameters is removed, and the parameter part corresponding to the second expected voltage value in the voltage control parameters is changed to obtain the adjusted voltage control parameters.

[0024] Wherein, the first expected voltage value is any one of the plurality of expected voltage values, and the second expected voltage value is any one of the plurality of expected voltage values.

[0025] In some possible implementations, the voltage control parameters are configured to cause the plurality of expected voltage values ​​to increase or decrease sequentially by equal magnitude, wherein the magnitude is the minimum step voltage of the Shortening Bar.

[0026] In some possible implementations, the method further includes, before transmitting voltage control parameters to the Shortening Bar:

[0027] Obtain parameter information for the oscilloscope and the Shorting Bar;

[0028] Based on the parameter information, the voltage control parameters are determined.

[0029] Secondly, this application proposes a computer device for calibrating the output voltage of a Shorting Bar, comprising:

[0030] memory,

[0031] Processor, and

[0032] Program instructions stored in the memory and executable by the processor;

[0033] When the program instructions are executed by the processor, the computer device performs the method as described in the first aspect.

[0034] Thirdly, this application proposes a computer-readable storage medium storing program instructions that, when executed on a computer device, cause the computer device to perform the method described in the first aspect.

[0035] The output voltage calibration method for the Shorting Bar proposed in this application is performed using an oscilloscope. It cleverly utilizes the oscilloscope's ability to quickly and accurately acquire voltage signals, rapidly acquiring the voltage values ​​of each band at the output of the Shorting Bar. Furthermore, it can continuously acquire the voltage values ​​of each band multiple times at short intervals, effectively monitoring the voltage jumps between adjacent bands, which helps improve the calibration accuracy and efficiency of the Shorting Bar's output voltage. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.

[0037] Figure 1 This is a schematic diagram of the output voltage calibration system for a Shorting Bar provided in one embodiment of this application.

[0038] Figure 2 This is a flowchart of a Shorting Bar output voltage calibration method provided in an embodiment of this application. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It is understood that, without conflict, some technical means of the various embodiments described herein can be substituted for or combined with each other.

[0040] In the description of this application, the terms "first," "second," etc., are used only to distinguish the described objects and have no sequential or technical meaning. Therefore, objects specified with "first," "second," etc., may explicitly or implicitly include one or more of those objects. Furthermore, the words "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one, while "multiple" indicates at least two.

[0041] In the description of this application, the terms "based on" or "according to" are used to describe one or more factors that influence the determination. This term does not exclude additional factors influencing the determination. That is, the determination may be based solely on these factors or at least partially on them. For example, the phrase "based on A to determine B" means that A is a factor influencing the determination of B, and this phrase does not exclude the possibility that the determination of B may also be based on C.

[0042] In the description of this application, references to "one embodiment" or "some embodiments" mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0043] The following is combined with Figure 1 and Figure 2 This application describes a method for calibrating the output voltage of a Shorting Bar according to embodiments of the present application. The Shorting Bar can be used to illuminate an OLED cell panel. This method can be applied to applications such as... Figure 1 The computer device shown illustrates that this method can be executed by various hardware components within the computer device in conjunction with corresponding software programs. Figure 1 In this method, computer equipment, an oscilloscope, and a shortening bar (used for voltage calibration) are connected to each other. The method includes:

[0044] S201, transmit voltage control parameters to the Shortening Bar. The voltage control parameters are used to instruct the output of the Shortening Bar to output multiple different expected voltage values ​​in multiple consecutive first time periods.

[0045] The computer device can be, for example, a PC (Personal Computer). In this embodiment, the computer device can send voltage control parameters generated therein to the Shortening Bar, so that the Shortening Bar outputs a desired voltage value from its output terminal based on the voltage control parameters. Exemplarily, the Shortening Bar is equipped with a digital-to-analog converter (DAC). When the Shortening Bar receives and executes the voltage control parameters, the DAC generates a corresponding internal voltage within the Shortening Bar. This internal voltage is transmitted to the output terminal of the Shortening Bar via its internal circuitry, thereby generating an external voltage at the output terminal. However, in step S201 of this embodiment, the external voltage generated at the output terminal does not directly illuminate the OLED cell panel. Instead, it is used to compare with the desired voltage value and calibrate the Shortening Bar based on the comparison result. Therefore, the waveform (change rule) of this external voltage does not need to completely correspond to the required waveform of the OLED cell panel. Therefore, to enable the Shortening Bar to rapidly and regularly output multiple different voltage values ​​within a short period of time, thereby improving calibration efficiency, the aforementioned voltage control parameters can be configured such that the multiple expected voltage values ​​increase (or decrease) sequentially by equal amplitude according to a time sequence, and the amplitude (i.e., the amplitude in the aforementioned "equal amplitude") is the minimum step voltage of the Shortening Bar. It can be understood that the aforementioned minimum step voltage is related to the stepping accuracy of the digital-to-analog converter (DAC) within the Shortening Bar.

[0046] The first time interval can be the minimum step time of Shortening Ba.

[0047] S102, when the Shortening Bar outputs a voltage signal (a changing waveform signal) from its output terminal in response to the voltage control parameters, the oscilloscope is controlled to acquire the measured voltage value of the Shortening Bar output terminal every second time interval, wherein the duration of the first time interval is N times the duration of the second time interval, and N is not less than 5.

[0048] Due to factors such as the internal resistance of the Shortening Bar, the actual voltage value output by the Shortening Bar may deviate from the expected voltage value. Therefore, the actual voltage value output by the Shortening Bar can be measured by a voltage measuring device so that the measured voltage value can be compared with the corresponding expected voltage value in step S203 below, and the deviation can be judged based on the comparison result.

[0049] Compared to traditional voltage testing devices, the inventors noticed that an oscilloscope capable of acquiring voltage values ​​(level values) from a voltage signal at a high frequency could be cleverly applied in this solution. Even a typical oscilloscope can acquire a voltage value every 10μs, while the duration of the same level value in the voltage signal (required by the OLED CELL panel) provided by the Shortening Bar is generally several hundred μs. Therefore, the oscilloscope can acquire multiple, for example, more than five, measured voltage values ​​within each initial time period.

[0050] In one example (hereinafter referred to as Example A), the voltage control parameters provided by the computer device are used to instruct the output of the Shorting Bar to output 8001 different expected voltage values ​​in successive 8001 200μs time intervals. These voltage values ​​are 40.000V, 39.990V, 39.980V, 39.970V, ..., -39.990V, -40.000V. The oscilloscope acquires the measured voltage value of the Shorting Bar output every 10μs. That is, in Example A, the first time interval (duration) is 200μs, the second time interval (duration) is 10μs, N=20, and the oscilloscope only needs 16 seconds to complete the acquisition of the voltage values ​​of all signal bands. Moreover, the voltage value of each signal band (one expected voltage value corresponds to one signal band) can be acquired 20 times sequentially.

[0051] S203 compares each of the multiple expected voltage values ​​with the multiple measured voltage values ​​corresponding to that expected voltage value.

[0052] S204. If the comparison result does not meet the set conditions, adjust the voltage control parameters and repeat the above steps until the comparison result meets the set conditions.

[0053] It is understandable that the setting condition is that the difference between the measured voltage value and the expected voltage value is within an acceptable range. If the difference is not within an acceptable range, the setting condition is not met. In this case, the computer equipment can adjust the voltage control parameters and send the adjusted voltage control parameters to the Shortening Bar. This process is repeated until the setting condition is met.

[0054] For each of the multiple expected voltage values ​​(such as the 8001 in Example A above), the expected voltage value is compared with its corresponding multiple measured voltage values. For example, in Example A above, for an expected voltage value of 20.000V, there are 20 measured voltage values ​​collected successively within the time period from 400000μs to 400200μs. The expected voltage value of 20.000V is compared one-to-one with five, ten, or all 20 of the aforementioned 20 measured voltage values. If any difference is too large, for example, exceeding ±30mV, it indicates that the voltage control parameters currently configured for the Shortening Bar do not meet the standard at 20.000V, and at least the parameter portion of the voltage control parameters at 20.000V needs to be readjusted.

[0055] In this embodiment, each expected voltage value is compared with multiple corresponding measured voltage values. If any measured voltage value fails to meet the requirements, the control parameter corresponding to that expected voltage value is adjusted so that the Shorting Bar can accurately and stably output various required voltage values.

[0056] In Example A above, although the voltage value of each signal band is sampled 20 times sequentially, it is not necessary to compare each expected voltage value with all 20 corresponding measured voltage values. This is because, within the same signal band of the output voltage signal (one (consecutive) signal band corresponds to one expected voltage value), the voltage control parameters keep the value of the AD register inside the Shortening Bar at a fixed value. This ensures that the voltage value generated by the voltage generation unit (such as a DAC) inside the Shortening Bar remains constant. Therefore, ideally, the 20 measured voltage values ​​sampled sequentially are identical. Comparing each expected voltage value with all 20 corresponding measured voltage values ​​would exponentially increase the data processing burden on the computer equipment.

[0057] The inventors noted that when the output voltage of the Shortening Bar changes from one band to an adjacent band, or in other words, when the output voltage of the Shortening Bar changes from one expected voltage value to another, such as from 30.000V to 30.010V, its actual output voltage will jump. For example, it may jump instantaneously to 30.012V before returning to 30.010V. This is mainly due to the influence of inductive and capacitive reactance in the internal circuitry of the Shortening Bar. The voltage jump usually occurs within ±20μs of the switching time between two adjacent expected voltage values. If this instantaneous high voltage jump is transmitted to the OLED cell panel, it may also cause the OLED cell panel to burn out.

[0058] Therefore, in order to balance a small data processing burden with the measurement of the switching voltage, in some embodiments, step S203 can be specifically set as follows:

[0059] Each of the multiple expected voltage values ​​is compared with at least four corresponding measured voltage values. At least two of the aforementioned at least four measured voltage values ​​are acquired within the first 20 μs of the corresponding first time period; at least two of the aforementioned at least four measured voltage values ​​are acquired within the last 20 μs of the corresponding first time period.

[0060] It is understandable that at least two measured voltage values ​​acquired within the first 20μs and at least two second measured voltage values ​​acquired within the last 20μs can typically reflect the voltage transition information of the Shortening Bar when switching output voltages. The more measured voltage values ​​acquired within the first and last 20μs, the more accurate the voltage transition information will be.

[0061] In step S204, the setting condition can be that the difference between each of the at least four measured voltage values ​​and the expected voltage value does not exceed a set threshold range. The set threshold range can be determined according to the requirements of the OLED CELL panel; for example, the set threshold range can be configured to -30mV to +30mV.

[0062] In other embodiments, to ensure sufficient accuracy of voltage calibration, step S203 may also involve comparing each of the multiple expected voltage values ​​with all the measured voltage values ​​corresponding to that expected voltage value. For example, in Example A above, each expected voltage value may be compared with all 20 measured voltage values ​​corresponding to that expected voltage value. In conjunction with the above description, to reduce missed detections of voltage jumps, for each expected voltage value, at least two of the measured voltage values ​​corresponding to that expected voltage value are collected within the first 20 μs of the first time period corresponding to that expected voltage value. This means that the duration of the second time period does not exceed 10 μs. In such embodiments, the set condition may be that the difference between each expected voltage value and each of the corresponding measured voltage values ​​(such as each of the 20 measured voltage values ​​in Example A) does not exceed a set threshold range.

[0063] The phrase "if the comparison result does not meet the set conditions, then adjust the voltage control parameters" mentioned in step S204 can specifically include:

[0064] If the comparison result corresponding to the first expected voltage value meets the set conditions, and the comparison result corresponding to the second expected voltage value does not meet the set conditions, then the parameter part corresponding to the first expected voltage value in the voltage control parameters is removed, and the parameter part corresponding to the second expected voltage value in the voltage control parameters is changed to obtain the adjusted voltage control parameters; wherein, the first expected voltage value is any one of a plurality of expected voltage values, and the second expected voltage value is any one of a plurality of expected voltage values.

[0065] To better understand the scheme described in the previous paragraph, let's take Example A again. In Example A, during the first execution of steps S201-S203, 8001 expected voltage values ​​are compared with many measured voltage values ​​corresponding to these 8001 expected voltage values. The comparison results may show that the measured voltage values ​​corresponding to 1000 of the expected voltage values ​​meet the requirements, while the measured voltage values ​​corresponding to the remaining 7001 expected voltage values ​​do not. If, during the second execution of steps S201-S203, the actual output voltages corresponding to the aforementioned 1000 expected voltage values ​​are measured and compared again, it would unnecessarily increase the data processing load of the computer equipment, thereby excessively prolonging the voltage calibration time at the Shortening Bar output. Therefore, during the second execution of steps S201-S203, the parameter portion corresponding to the aforementioned 1000 expected voltage values ​​in the initial voltage control parameters can be removed, and the parameter portion corresponding to the aforementioned 7001 expected voltage values ​​in the voltage control parameters can be changed. The adjusted voltage control parameters cause the output terminal of the Shortening Bar to output multiple different expected voltage values ​​only in 7001 consecutive first time periods. Then, the actual output voltages corresponding to these 7001 expected voltage values ​​are measured and compared, and the voltage control parameters in the computer device are adjusted again based on the comparison results. This process is repeated until the measured voltages corresponding to all 8001 expected voltage values ​​meet the requirements, thereby obtaining ideal voltage control parameters that are compatible with each expected voltage value.

[0066] Voltage control parameters are used to control the Shortening Bar to set rules for outputting voltage signals, and these rules should be adapted to the performance parameters of the oscilloscope and the Shortening Bar. In some embodiments, the method may further include the following before transmitting the voltage control parameters to the Shortening Bar, i.e., before performing step S201 for the first time:

[0067] Obtain parameter information for the oscilloscope and Shortening Bar;

[0068] Based on this parameter information, the (initial) voltage control parameters are determined.

[0069] Please see again. Figure 1This application also provides a computer device for calibrating the output voltage of a Shorting Bar, comprising: a memory, a processor, and program instructions stored in the memory and executable by the processor; when the program instructions are executed by the processor, the computer device performs the method described above.

[0070] In addition, embodiments of this application also provide a computer-readable storage medium storing program instructions that, when executed on a computer device, cause the computer device to perform the above-described method.

Claims

1. A method for calibrating the output voltage of a Shorting Bar, wherein the Shorting Bar is used to illuminate an OLED cell panel, characterized in that, The method includes the following steps: A voltage control parameter is transmitted to the Shorting Bar, the voltage control parameter being used to instruct the output of the Shorting Bar to output multiple different expected voltage values ​​in multiple consecutive first time periods; When the Shorting Bar outputs a voltage signal from the output terminal in response to the voltage control parameter, the oscilloscope is controlled to acquire the measured voltage value of the output terminal once every second time period, wherein the first time period is N times the second time period, and N is not less than 5; Each of the plurality of expected voltage values ​​is compared with the plurality of measured voltage values ​​corresponding to that expected voltage value; If the comparison result does not meet the set conditions, the voltage control parameters are adjusted and the above steps are repeated until the comparison result meets the set conditions. The step of adjusting the voltage control parameters if the comparison result does not meet the set conditions includes: if the comparison result corresponding to the first expected voltage value meets the set conditions, but the comparison result corresponding to the second expected voltage value does not meet the set conditions, then removing the parameter part of the voltage control parameters corresponding to the first expected voltage value, changing the parameter part of the voltage control parameters corresponding to the second expected voltage value, and obtaining the adjusted voltage control parameters, wherein the first expected voltage value is any one of the plurality of expected voltage values, and the second expected voltage value is any one of the plurality of expected voltage values; The set conditions include: the difference between each expected voltage value and each corresponding measured voltage value does not exceed a set threshold range, which is -30mV to +30mV.

2. The method according to claim 1, characterized in that, The step of comparing each of the plurality of expected voltage values ​​with the plurality of measured voltage values ​​corresponding to that expected voltage value includes: Each of the plurality of expected voltage values ​​is compared with all the measured voltage values ​​corresponding to that expected voltage value; wherein at least one of the measured voltage values ​​is acquired within the first 20µs of the corresponding first time period.

3. The method according to claim 2, characterized in that, in, At least two of the measured voltage values ​​were acquired within the first 20µs of the corresponding first time period.

4. The method according to claim 2, characterized in that, in, At least one of the measured voltage values ​​was acquired within the last 20µs of the corresponding first time period.

5. The method according to claim 4, characterized in that, in, At least two of the measured voltage values ​​were acquired within the last 20µs of the corresponding first time period.

6. The method according to claim 1, characterized in that, The first time period is the minimum step time of the Shortening Bar, and N is an integer not less than 10.

7. The method according to any one of claims 1 to 5, characterized in that, Before transmitting voltage control parameters to the Shorting Bar, the method further includes: Obtain parameter information for the oscilloscope and the Shorting Bar; Based on the parameter information, the voltage control parameters are determined.

8. A computer device for calibrating the output voltage of a Shorting Bar, characterized in that, include: memory, Processor, and Program instructions stored in the memory and executable by the processor; When the program instructions are executed by the processor, the computer device performs the method as described in any one of claims 1 to 7.

9. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are executed on a computer device, the computer device performs the method as described in any one of claims 1 to 7.

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