CN-122024604-A - Display unit LED voltage measurement method and device

Abstract

The invention discloses a method and a device for measuring LED voltage of a display unit, wherein the method for measuring the voltage comprises the steps of inputting constant current to an LED power supply pin of the display unit, controlling a driving chip of the display unit to adjust the input current value of the LED power supply pin to enable LED lamp beads to generate illumination intensity, collecting the illumination intensity value of the current LED lamp beads, carrying out optimizing test on the illumination intensity value of the LED lamp beads and a preset illumination intensity value, and measuring the voltage value of the LED power supply pin of the display unit. The technical scheme of the invention successfully bypasses the electric test black box barrier caused by advanced integrated packaging by the ingenious 'photoelectric linkage feedback control' principle, so that the LED display panel designed by the method not only meets the requirement of display effect, but also effectively reduces power consumption and achieves the purpose of energy conservation.

Inventors

• WANG ZHENLING
• YANG KUANG

Assignees

• 深圳市洲明科技股份有限公司

Dates

Publication Date

20260512

Application Date

20260305

Claims (10)

1. 1. The utility model provides a display element LED voltage measurement method for carry out voltage test to the display element that encapsulates drive chip and LED lamp pearl, its characterized in that, the measurement method includes: inputting constant current to an LED power supply pin of the display unit; Controlling a driving chip of the display unit to adjust an input current value of the LED power supply pin so that the LED lamp beads generate illumination intensity; Collecting the current illumination intensity value of the LED lamp bead, and carrying out optimizing test on the illumination intensity value of the LED lamp bead and a preset illumination intensity value; And measuring the voltage value of an LED power supply pin of the display unit.
2. 2. The method of claim 1, wherein the LED beads are full color mixed color integrated beads of at least three colors, and the method further comprises setting the LED beads to a single color display mode before the step of controlling the driving chip of the display unit to adjust the input current value of the LED beads.
3. 3. The method of claim 2, wherein the voltage value is measured as a first color voltage value when the LED bead displays a first single color, the voltage value is measured as a second color voltage value when the LED bead displays a second single color, the voltage value is measured as a third color voltage value when the LED bead displays a third single color, and the final voltage value is the maximum of the first color voltage value, the second color voltage value, and the third color voltage value.
4. 4. The method of claim 1, wherein the predetermined illumination intensity value is a test result value of the LED lamp beads in a conventional optical test flow.
5. 5. The method for measuring voltage according to claim 4, wherein the method for optimizing the illumination intensity value of the LED lamp bead and the preset illumination intensity value comprises the following steps: S11, recording the current illumination intensity value of the LED lamp bead; S12, calculating a value obtained by dividing the illumination intensity value of the LED lamp beads by a preset illumination intensity value; s13, judging whether the numerical value meets a preset threshold value or not; If not, adjusting the input current value of the LED power supply pin, and jumping to the step S11; if yes, stopping the optimizing test.
6. 6. The method of voltage measurement according to claim 5, wherein the method of adjusting the input current value of the LED power supply pin is: The corresponding relation between a plurality of constant current source set values and color LED lamp bead current set values is collected in advance; And according to the corresponding relation, adjusting the input current value of the LED power supply pin to be the current set value, and reducing the adjustment times.
7. 7. The method for measuring voltage according to claim 4, wherein the method for optimizing the illumination intensity value of the LED lamp bead and the preset illumination intensity value comprises the following steps: s21, recording the current illumination intensity value of the LED lamp bead; S22, calculating the relative error between the current illumination intensity value of the LED lamp bead and a preset illumination intensity value; S23, judging whether the relative error meets a preset condition, if so, stopping the optimizing test, and if not, jumping to the step S24; And S24, calculating a next current value by adopting a proportional-integral control algorithm, adjusting the input current value of the LED power supply pin according to the current value, and jumping to the step S21.
8. 8. The method of claim 7, wherein the proportional-integral control algorithm is next current value=present current value+Ki×the relative error, where Ki is a preset control parameter.
9. 9. The utility model provides a display element LED voltage measurement device for to encapsulate the display element that has drive chip and LED lamp pearl and carry out voltage test, its characterized in that includes: The constant current source module is used for inputting constant current to the LED power supply pin of the display unit; the optical measurement module is used for collecting the current illumination intensity value of the LED lamp beads; The voltage detection module is connected with the LED power supply pin of the display unit and is used for measuring the voltage value of the LED power supply pin of the display unit; The LED lamp bead optimizing device comprises a display unit, a control module and a control module, wherein the display unit is used for displaying the LED lamp bead, the control module is used for controlling a driving chip of the display unit to adjust an input current value of an LED power supply pin so that the LED lamp bead generates illumination intensity, and the control module is used for optimizing the illumination intensity value of the LED lamp bead and a preset illumination intensity value.
10. 10. The voltage measurement device of claim 9, further comprising a current detection module for measuring a current value of the display unit to adjust an input current value of the LED power supply pin in cooperation with a driver chip of the display unit.

Description

Display unit LED voltage measurement method and device Technical Field The invention relates to the technical field of LED display screen testing, in particular to a method and a device for measuring LED voltage of a display unit. Background The future of LED displays tends to highlight and save energy. The LED display screen is usually assembled by a plurality of display units, and each display unit generally adopts an innovative packaging scheme, such as two core technologies of AM (Active Matrix driving) and MIP (Micro LED INTEGRATED PACKAGE Micro LED integrated package). The method has the advantages of reducing yield pressure and cost, and can generate excellent display image quality, such as pixel independent control, and extremely high contrast, HDR effect, color expression and the like. The IC (INTEGRATED CIRCUIT integrated circuit) and LED lamp driver package of such a display unit typically leads out the pins of the IC signal, IC power supply and LED power supply. The existing test equipment and test method only measure the optical characteristics and the LED current of the LEDs during electrical and optical tests and do not have the measurement condition of the LED voltage. In order to obtain the LED voltage, it is common practice to estimate the voltage across the LED at the driving current using the LED specification, and then estimate the voltage of the IC switching loss and the power IR Drop loss voltage to obtain the LED driving voltage. The estimation method is inaccurate, the obtained LED voltage is larger in margin reservation, the LED power consumption is wasted, or the margin reservation is smaller, and the remote LED is in color cast risk. Disclosure of Invention The invention mainly aims to provide a method and a device for measuring the voltage of an LED of a display unit, and aims to solve the technical problem that the LED display screen designed by the method for estimating the voltage of the LED cannot accurately obtain the voltage when the LED normally displays, so that the power consumption is wasted or color development deviation exists. In order to achieve the above object, the present invention provides a method for measuring voltage of an LED of a display unit, for performing voltage test on the display unit packaged with a driving chip and LED beads, the method comprising: inputting constant current to an LED power supply pin of the display unit; Controlling a driving chip of the display unit to adjust an input current value of the LED power supply pin so that the LED lamp beads generate illumination intensity; Collecting the current illumination intensity value of the LED lamp bead, and carrying out optimizing test on the illumination intensity value of the LED lamp bead and a preset illumination intensity value; And measuring the voltage value of an LED power supply pin of the display unit. Further, the LED light beads are full-color mixed color integrated light beads with at least three colors, and the measurement method further comprises setting the LED light beads to a single-color display mode before the step of controlling the driving chip of the display unit to adjust the input current value of the LED light beads. Further, when the LED lamp beads display a first single color, the voltage value is measured to be a first color voltage value, when the LED lamp beads display a second single color, the voltage value is measured to be a second color voltage value, when the LED lamp beads display a third single color, the voltage value is measured to be a third color voltage value, and the final voltage value is the maximum value of the first color voltage value, the second color voltage value and the third color voltage value. Further, the preset illumination intensity value is a test result value of the LED lamp beads in a conventional optical test flow. Further, the method for optimizing the illumination intensity value of the LED lamp bead and the preset illumination intensity value comprises the following steps: S11, recording the current illumination intensity value of the LED lamp bead; S12, calculating a value obtained by dividing the illumination intensity value of the LED lamp beads by a preset illumination intensity value; s13, judging whether the numerical value meets a preset threshold value or not; If not, adjusting the input current value of the LED power supply pin, and jumping to the step S11; if yes, stopping the optimizing test. Further, the method for adjusting the input current value of the LED power supply pin comprises the following steps: The corresponding relation between a plurality of constant current source set values and color LED lamp bead current set values is collected in advance; And according to the corresponding relation, adjusting the input current value of the LED power supply pin to be the current set value, and reducing the adjustment times. Further, the method for optimizing the illumination intensity value of the LED lamp bead and