WO2022120584A1

WO2022120584A1 - Led display unit yin-yang color measuring apparatus and measuring method

Info

Publication number: WO2022120584A1
Application number: PCT/CN2020/134599
Authority: WO
Inventors: 陈依籍; 徐梦梦
Original assignee: 深圳市艾比森光电股份有限公司
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2022-06-16
Also published as: CN116615777A

Abstract

An LED display unit (20) yin-yang color measuring apparatus and measuring method. The LED display unit (20) yin-yang color measuring apparatus comprises a first light collector (11) and a second light collector (12); the first light collector (11) and the second light collector (12) are located on the two sides of a light exit surface of the LED display unit (20) respectively; light emitted by LEDs in the LED display unit (20) is converted into a first photoelectric signal once irradiated on the first light collector (11); the light emitted by the LEDs in the LED display unit (20) is converted into a second photoelectric signal once irradiated on the second light collector (12); and the brightness difference of the LED display unit (20) is determined according to a coincidence degree of the first photoelectric signal and the second photoelectric signal. LED lamp beads of the LED display unit (20) emit light which is then irradiated on the two light collectors (10), and then the light irradiated on the two light collectors (10) is converted into the first photoelectric signal and the second photoelectric signal respectively. By means of comparing the two photoelectric signals, yin-yang colors of the LED display unit (20) can be determined.

Description

LED display unit yin and yang color measuring device and measuring method

technical field

The present application relates to the field of display technology, and in particular, to an LED display unit yin and yang color measurement device and measurement method.

Background technique

Light emitting diode (LED) display has the advantages of wide color gamut, high brightness, large viewing angle, low power consumption and long life, so in the field of display, LED display is widely used. For example, the more common securities trading and financial information display, airport flight dynamic information display, port and station passenger guidance information display, stadium information display, road traffic information display, power dispatching and vehicle dynamic tracking and other dispatching command center information display, shopping mall shopping Display of business publicity information and advertising media products in service areas such as centers.

The LED display is usually composed of multiple LED display cabinets, and each LED display cabinet includes a cabinet frame and multiple display modules; multiple display modules are fixed on the cabinet frame to form a Complete LED display box. The display module includes components such as a light panel, a mask, and a housing, and the mask and the housing are respectively located on both sides of the light panel. The lamp board includes a printed circuit board (PCB), LED lamp beads and driving circuits arranged on the printed circuit board, and the like.

With the development of LED display, the improvement of its pixel pitch and optical performance has always been the focus of the industry. Among them, the smaller and smaller pixel pitch is a major development trend. However, as the pixel pitch shrinks, the technological difficulty of the LED display increases, and the optical performance of the LED display cannot be guaranteed. Among them, the most common problem is the wide whitening phenomenon in the screen under a pure black background due to differences in packaging materials, packaging process differences, and patch production differences, and some areas of the screen appear on a pure white background. Yellow or dark areas, referred to as yin and yang colors. Taking patch production as an example, the general patch process mainly includes three steps: solder paste printing, LED mounting and reflow soldering on the printed circuit board in sequence. During the current patch process, the following abnormal situations will occur: during the solder paste printing process, due to the insufficient printing accuracy of the solder paste, the solder paste and the pads on the PCB are displaced; or, the LED lamp pins and The solder paste is misaligned, causing the LEDs to be tilted. The above-mentioned situations will lead to the appearance of yin and yang colors, and as the pixel pitch becomes smaller and smaller, the positional accuracy requirements between the PCB pads and the solder paste are also getting higher and higher, and the yin and yang color problems that arise are also increasing. more serious.

Therefore, in order to improve the yin-yang color phenomenon of the LED display screen, it is an essential step to measure the yin-yang color problem of the LED display screen, so as to provide a reference for the improvement of the process. At present, the method of measuring the yin and yang colors of the LED display screen is: using a photometric radiometer to measure. Specifically, the photometric radiometer is fixed, and then the LED display screen to be measured is placed on a rotary table, and the LED display screen is rotated by manually rotating the rotary table, so that the photometric radiometer collects data for measurement. The above measurement methods require a lot of manual participation, the measurement efficiency is too low, and the accuracy is poor.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide an LED display unit yin and yang color measurement device and measurement method, which does not require manual participation, improves measurement efficiency, and improves accuracy.

A first aspect of the present application provides an LED display unit yin and yang color measuring device, comprising a first light collector and a second light collector; the first light collector and the second light collector are respectively located on two sides of a light-emitting surface of the LED display unit side; after the light emitted by the LED in the LED display unit is irradiated on the first light collector, a photoelectric effect occurs on the first light collector and is converted into a first photoelectric signal; the light emitted by the LED in the LED display unit is irradiated on the second light collector. After the light collector is installed, a photoelectric effect occurs on the second light collector, which is converted into a second photoelectric signal; the brightness difference of the LED display unit can be determined according to the coincidence of the first photoelectric signal and the second photoelectric signal.

It can be seen from the above that the LED display unit yin and yang color measuring device emits light through the LED lamp beads of the LED display unit and then illuminates the two light collectors at different positions, and then the light illuminated on the first light collector is converted into the first light collector. A photoelectric signal, the light irradiated on the second light collector is converted into a second photoelectric signal, and the yin and yang colors of the LED display unit can be determined by comparing the two photoelectric signals. In this embodiment, the light emission of the LED display unit can be quickly measured without manual participation in the measurement process, the detection efficiency is improved, and the detection result is relatively accurate.

Optionally, the center normal of the first light collector coincides with the center normal of the second light collector, and the center normal of the light-emitting surface of the LED display unit and the center normal of the first light collector perpendicularly intersect.

Optionally, the LEDs in the LED display unit emit light at the same time.

Optionally, determining the brightness difference of the LED display unit according to the coincidence of the first photoelectric signal and the second photoelectric signal includes: determining the difference between the ratio of the first photoelectric signal and the second photoelectric signal and the difference of 1. Brightness difference.

Optionally, the LED display unit includes N columns of LEDs, where N is a positive integer greater than or equal to 1; after the LEDs in the first to Nth columns emit light column by column incrementally and irradiate on the first light collector, they are converted into N first light collectors. The photoelectric signals P1 ₁ to P1 _N ; the first photoelectric signal P1 ₁ includes the photoelectric signal converted after the LED in the first column emits light, the first photoelectric signal P1 ₂ includes the photoelectric signal converted after the LED in the first column and the second column emit light at the same time, A photoelectric signal P1 _N includes a photoelectric signal converted after the LEDs in the first to Nth columns emit light simultaneously; the LEDs in the first to Nth columns emit light column by column incrementally and are irradiated on the second light collector, and then converted into N second light collectors. The photoelectric signals P2 ₁ to P2 _N ; the second photoelectric signal P2 ₁ includes the photoelectric signal converted after the LEDs in the first column emit light, and the second photoelectric signal P2 ₂ includes the photoelectric signals converted after the LEDs in the first column and the second column emit light at the same time. The two photoelectric signals P2 _N include photoelectric signals converted after the LEDs in the first to Nth columns emit light simultaneously.

After the LEDs in the Nth column to the first column emit light column by column incrementally and irradiate on the first light collector, they are converted into N first photoelectric signals P3 _N to P3 ₁ ; the first photoelectric signal P3 _N includes the conversion after the Nth column LED emits light. The first photoelectric signal P3 _N-1 includes the photoelectric signal converted after the LEDs in the Nth column and the N-1th column emit light at the same time, and the first photoelectric signal P3 ₁ includes the LEDs in the Nth to 1st columns. After the LEDs in the Nth to 1st columns emit light column by column incrementally and irradiate on the second light collector, they are converted into N second photoelectric signals P4 _N to P4 ₁ ; the second photoelectric signal P4 _N includes the Nth column. The photoelectric signal converted after the LED emits light, the second photoelectric signal P4 _N-1 includes the photoelectric signal converted after the LEDs in the Nth and N-1th columns emit light at the same time, and the second photoelectric signal P4 ₁ includes the Nth to 1st columns of LEDs The photoelectric signal converted after emitting light at the same time.

Optionally, the LED display unit includes N rows of LEDs, where N is a positive integer greater than or equal to 1; after the first row to the Nth row of LEDs emit light incrementally and irradiate on the first light collector, they are converted into N first light collectors. The photoelectric signals P1 ₁ to P1 _N ; the first photoelectric signal P1 ₁ includes the photoelectric signal converted after the LEDs in the first row emit light, and the first photoelectric signal P1 ₂ includes the photoelectric signals converted after the LEDs in the first row and the second row emit light at the same time. A photoelectric signal P1 _N includes the photoelectric signals converted after the LEDs in the first row to the Nth row emit light at the same time; the LEDs in the first row to the Nth row emit light incrementally row by row and irradiate on the second light collector, and are converted into N second light collectors. The photoelectric signals P2 ₁ to P2 _N ; the second photoelectric signal P2 ₁ includes the photoelectric signal converted after the LEDs in the first row emit light, and the second photoelectric signal P2 ₂ includes the photoelectric signals converted after the LEDs in the first row and the second row emit light at the same time. The two photoelectric signals P2 _N include photoelectric signals converted after the LEDs in the first row to the Nth row emit light simultaneously.

After the LEDs in the Nth row to the 1st row emit light incrementally on the first light collector, they are converted into N first photoelectric signals P3 _N ˜P3 ₁ ; the first photoelectric signal P3 _N includes the conversion after the Nth row LEDs emit light. The first photoelectric signal P3 _N-1 includes the photoelectric signal converted after the LEDs in the Nth row and the N-1th row emit light at the same time, and the first photoelectric signal P3 ₁ includes the Nth row to the 1st row. After the LEDs from the Nth row to the first row emit light incrementally on the second light collector, they are converted into N second photoelectric signals P4 _N to P4 ₁ ; the second photoelectric signal P4 _N includes the Nth row. The photoelectric signal converted after the LED emits light, the second photoelectric signal P4 _N-1 includes the photoelectric signal converted after the LEDs in the Nth row and the N-1th row emit light at the same time, and the second photoelectric signal P4 ₁ includes the Nth row to the 1st row of LEDs The photoelectric signal converted after emitting light at the same time.

Optionally, determining the brightness difference of the LED display unit according to the degree of coincidence of the first photoelectric signal and the second photoelectric signal includes: generating a first curve by using N first photoelectric signals P1 ₁ to P1 _N ; using N second photoelectric signals to generate a first curve; The signals P2 ₁ ˜P2 _N generate a second curve; the N first photoelectric signals P3 _N ˜P3 ₁ are used to generate a third curve; the N second photoelectric signals P4 _N ˜P4 ₁ are used to generate a fourth curve; The degree of coincidence of the fourth curve, and the degree of coincidence of the second curve and the third curve, determine the brightness difference of the LED display unit.

Before the light emitted by the LED in the LED display unit is irradiated on the first light collector, the LED display unit male and female color measuring device further includes: disposing a fixed substrate between the first light collector and the second light collector, A calibration light source is arranged on the substrate, so that: the center normal of the calibration light source coincides with the center normal of the fixed substrate; a connecting line is formed between the center of the first light collector and the center of the second light collector, and the center normal of the calibration light source Perpendicular to the connecting line, the center normal of the calibrated light source intersects the midpoint of the connecting line.

A second aspect of the present application provides an LED display unit yin and yang color measuring device, comprising a light collector; the light collector faces the light-emitting surface of the LED display unit; the light emitted by the LEDs in the first area of the LED display unit is irradiated on the light collector After the photoelectric effect occurs on the light collector, it is converted into a first photoelectric signal; after the light emitted by the LED in the second area of the LED display unit is irradiated on the light collector, a photoelectric effect occurs on the light collector and is converted into the first photoelectric signal. Two photoelectric signals; the LEDs in the first area and the LEDs in the second area are symmetrically distributed with the projection of the light collector on the LED display unit as the center; the LED display unit can be determined according to the coincidence degree of the first photoelectric signal and the second photoelectric signal difference in brightness.

The LED display unit yin and yang color measuring device divides the LED display unit into two parts, and each part includes a plurality of LEDs; then the two parts of the LEDs on the LED display unit emit light and irradiate on the light collector respectively, and are converted into the first By comparing the first photoelectric signal and the second photoelectric signal, the yin and yang colors of the LED display unit can be determined. In this embodiment, the light emission of the LED display unit can be quickly measured without manual participation in the measurement process, the detection efficiency is improved, and the detection result is relatively accurate.

Optionally, the center normal of the light collector coincides with the center normal of the light emitting surface of the LED display unit.

Optionally, the light emitting surface of the LED display unit is divided into a first area and a second area with its longitudinal central axis as the dividing line; or, the light emitting surface of the LED display unit is divided into a first area and a second area with its transverse central axis as the dividing line area; the longitudinal central axis and the central normal of the light-emitting surface of the LED display unit intersect vertically, and the transverse central axis is perpendicular to the longitudinal central axis.

Optionally, the LEDs in the first region emit light simultaneously, and the LEDs in the second region emit light simultaneously.

Optionally, when the light-emitting surface of the LED display unit is divided into a first area and a second area with its longitudinal central axis as the dividing line: the LED display unit includes N columns of LEDs; the first area includes columns 1 to N/th. 2 rows of LEDs, and the second area includes LEDs from rows N/2+1 to N; N is a positive integer greater than or equal to 1; the light-emitting surface of the LED display unit is divided into the first area with its transverse central axis as the dividing line In the case of and the second area: the LED display unit includes N rows of LEDs, the first area includes the first row to the N/2 row of LEDs, and the second area includes the N/2+1 row to the Nth row of LEDs; N is a positive integer greater than or equal to 1.

Optionally, in the case where the LED display unit includes N columns of LEDs: in the first region, the first to N/2 columns of LEDs emit light column by column incrementally, and are converted into N/2 first photoelectric signals P ₁ ˜P _N/2 _; the _first photoelectric signal P1 includes the photoelectric signal converted after the LEDs in the first column emit light, the first photoelectric signal P2 includes the photoelectric signal converted after the LEDs in the first column and the second column emit light at the same time, and the first photoelectric signal P _N/2 includes the photoelectric signals converted after the LEDs in the 1st to N/2th columns emit light at the same time; in the second area, the LEDs in the Nth to N/2+1th columns emit light incrementally column by column, which is converted into N/2 The second photoelectric signals P _N to P _N/2+1 ; the second photoelectric signal P _N includes the photoelectric signals converted after the LEDs in the Nth column emit light, and the second photoelectric signal P _N-1 includes the Nth column and the N-1th column The photoelectric signals converted after the LEDs emit light at the same time, the second photoelectric signal P _N/2+1 includes the photoelectric signals converted after the LEDs in the Nth to N/2+1th columns emit light simultaneously.

In the case where the LED display unit includes N rows of LEDs: in the first area, the LEDs from the first row to the N/2th row emit light incrementally row by row, and are converted into N/2 first photoelectric signals P ₁ to P _N/2 ; The _first photoelectric signal P1 includes the photoelectric signal converted after the LEDs in the first row emit light, the first photoelectric signal P2 includes the photoelectric signal converted after the LEDs in the first row and the second row emit light at the same time, and the first photoelectric signal P _N/2 _includes The photoelectric signals converted after the LEDs from the 1st row to the N/2th row emit light at the same time; in the second area, the LEDs from the Nth row to the N/2+1 row emit light incrementally row by row, which are converted into N/2 second photoelectric signals _PN ~ _PN/2+1 ; the second photoelectric signal PN includes the photoelectric signal converted after the LEDs in the Nth row emit light, and the second photoelectric signal P _N _-1 includes the LEDs in the Nth row and the N-1th row after the LEDs emit light at the same time. The converted photoelectric signal, the second photoelectric signal P _N/2+1 includes the converted photoelectric signals after the LEDs in the Nth row to the N/2+1th row emit light simultaneously.

Optionally, determining the brightness difference of the LED display unit according to the degree of coincidence of the first photoelectric signal and the second photoelectric signal includes: generating a first curve by using N/2 first photoelectric signals P ₁ to P _N/2 , and using N /2 second photoelectric signals P _N to P _N/2+1 to generate a second curve; the brightness difference of the LED display unit is determined according to the coincidence degree of the first curve and the second curve.

Optionally, the light collector is in the shape of a circle; before the light emitted by some LEDs in the LED display unit is irradiated on the light collector, the LED display unit yin and yang color measuring device further includes: calibrating the center of the light-emitting surface of the LED display unit; The LED display unit displays a circular light area with the center of the light-emitting surface of the LED display unit as the center; adjust the center of the circular projection of the light collector on the light-emitting surface of the LED display unit to coincide with the center of the circular light area.

A third aspect of the present application provides a method for measuring yin and yang colors of an LED display unit, including: receiving a first photoelectric conversion signal; receiving a second photoelectric conversion signal; Brightness difference. In this embodiment, the yin and yang colors of the LED display unit can be determined by comparing the two photoelectric signals. In this embodiment, the light emission of the LED display unit can be quickly measured without manual participation in the measurement process, the detection efficiency is improved, and the detection result is relatively accurate.

Optionally, receiving the first photoelectric conversion signal and receiving the second photoelectric conversion signal includes: receiving the first photoelectric conversion signal and the second photoelectric conversion signal respectively converted after the LEDs in the LED display unit emit light simultaneously; Determining the brightness difference of the LED display unit by the coincidence degree with the second photoelectric signal includes: determining the brightness difference of the LED display unit according to the ratio of the first photoelectric signal and the second photoelectric signal and the difference of 1.

Optionally, the LED display unit includes N columns of LEDs, where N is a positive integer greater than or equal to 1; receiving the first photoelectric conversion signal includes: respectively receiving the LEDs in the first to Nth columns to emit light column by column, respectively converting them into The N first photoelectric signals P1 ₁ ˜P1 _N and the converted N first photoelectric signals P3 _N ˜P3 ₁ ; wherein, the first photoelectric signals P1 ₁ include the photoelectric signals converted after the LEDs in the first column emit light, and the first photoelectric signals The signal P12 includes the photoelectric signal converted after the LEDs in the first column and the second column emit light at the same time, the first photoelectric signal _P1N includes the photoelectric signal converted after the LEDs in the first column to the _Nth column emit light at the same time; the first photoelectric signal _P3N includes The photoelectric signal converted after the LEDs in the Nth column emit light. The first photoelectric signal P3 _N-1 includes the photoelectric signals converted after the LEDs in the Nth column and the N-1th column emit light at the same time. The first photoelectric signal P3 ₁ includes the Nth column to the Nth column. The photoelectric signal converted after 1 column of LEDs emit light at the same time.

Receiving the second photoelectric conversion signals includes: respectively receiving N second photoelectric signals P2 1 ˜P2 N converted into N second photoelectric signals P2 ₁ to P2 _N and N second photoelectric signals P4 _N converted after the LEDs in the Nth to 1st columns emit light incrementally column by column respectively. ～P4 ₁ ; wherein, the second photoelectric signal P2 ₁ includes the photoelectric signal converted after the LEDs in the first column emit light, the second photoelectric signal P2 ₂ includes the photoelectric signals converted after the LEDs in the first column and the second column emit light at the same time, and the second photoelectric signal P4 1 ; The signal P2 _N includes the photoelectric signals converted after the LEDs in the first to Nth columns emit light at the same time; the second photoelectric signal P4 _N includes the photoelectric signals converted after the LEDs in the Nth column emit light, and the second photoelectric signal P4 _N-1 includes the Nth column. The second photoelectric signal P4 ₁ includes the photoelectric signals converted after the LEDs in the Nth to 1st columns emit light at the same time.

Optionally, the LED display unit includes N rows of LEDs, where N is a positive integer greater than or equal to 1; receiving the first photoelectric conversion signal includes: respectively receiving the first row to the Nth row of LEDs to emit light incrementally row by row, respectively converting them into The N first photoelectric signals P1 ₁ ˜P1 _N and the converted N first photoelectric signals P3 _N ˜P3 ₁ ; wherein, the first photoelectric signals P1 ₁ include the photoelectric signals converted after the LEDs in the first row emit light, and the first photoelectric signals The signal P12 includes the photoelectric signal converted after the LEDs in the first row and the second row emit light simultaneously, the first photoelectric signal _P1N includes the photoelectric signal converted after the LEDs in the first row to the _Nth row emit light at the same time; the first photoelectric signal _P3N includes The photoelectric signal converted after the LEDs in the Nth row emit light. The first photoelectric signal P3 _N-1 includes the photoelectric signals converted after the LEDs in the Nth row and the N-1th row emit light at the same time. The first photoelectric signal P3 ₁ includes the Nth row to the Nth row. The photoelectric signal converted after 1 row of LEDs emit light at the same time.

Receiving the second photoelectric conversion signals includes: respectively receiving N second photoelectric signals P2 1 to P2 N converted into N second photoelectric signals P2 ₁ to P2 _N and N second photoelectric signals P4 _N converted after the LEDs in the Nth row to the first row emit light incrementally row by row respectively. ～P4 ₁ ; wherein, the second photoelectric signal P2 ₁ includes the photoelectric signal converted after the LEDs in the first row emit light, the second photoelectric signal P2 ₂ includes the photoelectric signals converted after the LEDs in the first row and the second row emit light at the same time, and the second photoelectric signal P4 1 ; The signal P2 _N includes the photoelectric signal converted after the LEDs in the first row to the Nth row emit light at the same time; the second photoelectric signal P4 _N includes the photoelectric signal converted after the LED in the Nth row emits light, and the second photoelectric signal P4 _N-1 includes the Nth row. The second photoelectric signal P4 ₁ includes the photoelectric signals converted after the LEDs in the Nth row to the 1st row emit light at the same time.

Optionally, determining the brightness difference of the LED display unit according to the coincidence degree of the first photoelectric signal and the second photoelectric signal includes: generating a first curve by using N first photoelectric signals P1 ₁ to P1 _N ; using N second photoelectric signals P2 ₁ -P2 _N generate a second curve; use N first photoelectric signals P3 _N -P3 ₁ to generate a third curve; use N second photoelectric signals P4 _N -P4 ₁ to generate a fourth curve; The coincidence degree of the four curves, and the coincidence degree of the second curve and the third curve, determine the brightness difference of the LED display unit.

Optionally, the light emitting surface of the LED display unit is divided into a first area and a second area with its longitudinal central axis as the dividing line; or, the light emitting surface of the LED display unit is divided into a first area and a second area with its transverse central axis as the dividing line area; the longitudinal center axis and the center normal of the light-emitting surface of the LED display unit are perpendicularly intersected, and the transverse center axis is perpendicular to the longitudinal center axis; receiving the first photoelectric conversion signal and receiving the second photoelectric conversion signal includes: receiving the After the LEDs emit light at the same time, the first photoelectric conversion signal is converted; the second photoelectric conversion signal converted by the simultaneous light emission of the LEDs in the second area is received; according to the coincidence degree of the first photoelectric signal and the second photoelectric signal The brightness difference includes: determining the brightness difference of the LED display unit according to the difference between the ratio of the first photoelectric signal and the second photoelectric signal and 1.

Optionally, the light-emitting surface of the LED display unit is divided into a first area and a second area with its longitudinal central axis as a dividing line; the light-emitting surface of the LED display unit is divided into a first area and a second area by its longitudinal central axis as a dividing line. Case: The LED display unit includes N columns of LEDs; the first area includes the 1st to N/2th columns of LEDs, and the second area includes the N/2+1th to Nth columns of LEDs; N is greater than or equal to A positive integer of 1; in the case that the LED display unit includes N columns of LEDs: receiving the first photoelectric conversion signal includes: receiving the first to N/2 column LEDs in the first area to emit light column by column, and the converted N/ Two first photoelectric signals P ₁ to P _N/2 ; the first photoelectric signal P ₁ includes the photoelectric signals converted after the LEDs in the first column emit light, and the first photoelectric signal P ₂ includes the first and second columns after the LEDs emit light at the same time. The converted photoelectric signal, the first photoelectric signal P _N/2 includes the photoelectric signal converted after the LEDs in the 1st to N/2th columns emit light at the same time; receiving the second photoelectric conversion signal includes: receiving the Nth to Nth columns in the second area After the LEDs in N/2+1 columns emit light incrementally column by column, N/2 second photoelectric signals P _N to P _N _/2+1 are converted into N/2 second photoelectric signals PN; Signal, the second photoelectric signal P _N-1 includes the photoelectric signal converted after the LEDs in the Nth column and the N-1th column emit light at the same time, and the second photoelectric signal P _N/2+1 includes the Nth column to N/2+1. The photoelectric signal converted after the column LEDs emit light at the same time.

Optionally, the light emitting surface of the LED display unit is divided into a first area and a second area with its transverse central axis as the dividing line; the light emitting surface of the LED display unit is divided into the first area and the second area with its transverse central axis as the dividing line. Case: The LED display unit includes N rows of LEDs, the first area includes the first row to the N/2 row of LEDs, and the second area includes the N/2+1 row to the Nth row of LEDs; N is greater than or equal to A positive integer of 1; in the case that the LED display unit includes N rows of LEDs: receiving the first photoelectric conversion signal includes: receiving the N/N converted signals after the LEDs in the first area to the N/2th row emit light incrementally row by row. /2 first photoelectric signals P ₁ to P _N/2 ; the first photoelectric signal P ₁ includes the photoelectric signals converted after the LEDs in the first row emit light, and the first photoelectric signal P ₂ includes the first and second rows of LEDs that emit light at the same time The post-converted photoelectric signal, the first photoelectric signal P _N/2 includes the photoelectric signals converted after the LEDs in the first row to the N/2 row emit light at the same time; receiving the first photoelectric conversion signal includes: receiving the Nth row to the N/2th row in the second area. After the N/2+1 row LEDs emit light incrementally row by row, the converted N/2 second photoelectric signals P _N to P _N/2+1 are converted into N/2 second photoelectric signals P _N ; The photoelectric signal, the second photoelectric signal P _N-1 includes the photoelectric signal converted after the LEDs in the Nth row and the N-1th row emit light at the same time, and the second photoelectric signal P _N/2+1 includes the Nth row to N/2+ The photoelectric signal converted after 1 row of LEDs emit light at the same time.

Optionally, determining the brightness difference of the LED display unit according to the degree of coincidence of the first photoelectric signal and the second photoelectric signal includes: generating a first curve by using N/2 first photoelectric signals P ₁ to P _N/2 , and using N/2 to generate a first curve. The two second photoelectric signals P _N to P _N/2+1 generate a second curve; the brightness difference of the LED display unit is determined according to the coincidence of the first curve and the second curve.

Description of drawings

In order to illustrate the technical solutions of the present application more clearly, the following briefly introduces the accompanying drawings that are required in the implementation manner.

FIG. 1 is a front view of an LED display unit yin and yang color measuring device provided by an embodiment of the present application;

2 is a front view of a measurement method of the LED display unit yin and yang color measurement device provided by an embodiment of the present application;

3 is a front view of another measurement method of the LED display unit yin and yang color measurement device provided by an embodiment of the present application;

FIG. 4 is a top view of a calibration method of a yin and yang color measuring device for an LED display unit provided by an embodiment of the present application;

Fig. 5 is the right side view of the LED display unit yin-yang color measuring device provided by another embodiment of the present application;

FIG. 6 is a top view of a device for measuring yin and yang colors of an LED display unit provided by another embodiment of the present application;

FIG. 7 is a front view of an LED display unit yin and yang color measuring device provided by another embodiment of the present application;

FIG. 8 is a flowchart of a method for measuring yin and yang colors of an LED display unit provided by an embodiment of the present application.

Description of reference numbers:

light collector 10, center normal 101 of the light collector, first light collector 11, center normal 111 of the first light collector, second light collector 12, center normal 121 of the second light collector, The LED display unit 20 , the center normal 21 of the light-emitting surface of the LED display unit, the horizontal center axis 22 , the vertical center axis 23 , the circular light area 24 , the fixing device 30 , the fixing substrate 50 , and the calibration light source 50 .

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

In general, an LED display is made up of multiple LED display cabinets, and each LED display cabinet includes a cabinet frame and multiple display modules; multiple display modules are fixed on the cabinet frame A complete LED display box is formed on it. The display module includes components such as a light panel, a mask, and a housing, and the mask and the housing are respectively located on both sides of the light panel. The lamp board includes a printed circuit board (PCB), LED lamp beads and driving circuits arranged on the printed circuit board, and the like.

The LED display unit 20 involved in the present application, as the name suggests, is a unit that displays with LED lamp beads. The LED display unit 20 may include any device that uses LED lamp beads for display, such as the above-mentioned LED display screen, LED display cabinet, LED display module, and LED light board.

Based on the above LED display unit 20 , please refer to FIG. 1 to FIG. 3 , the following describes the LED display unit male and female color measurement device provided by an embodiment of the present application, including the first light collector 11 and the second light collector 12 . The first light collector 11 and the second light collector 12 are respectively located on both sides of the light emitting surface of the LED display unit 20 .

Wherein, after the light emitted by the LEDs in the LED display unit 20 is irradiated on the first light collector 11, a photoelectric effect occurs on the first light collector 11 and is converted into a first photoelectric signal; the light emitted by the LEDs in the LED display unit 20 After being irradiated on the second light collector 12, a photoelectric effect occurs on the second light collector 12, and is converted into a second photoelectric signal. The brightness difference of the LED display unit 20 can be determined according to the coincidence of the first photoelectric signal and the second photoelectric signal.

It should be understood that a controller may also be included, and the controller may be electrically connected to the first light collector 11 and the second light collector 12, and the first light collector 11 and the second light collector 12 may respectively connect the The first photoelectric signal and the second photoelectric signal are sent to the controller, and the controller uses the first photoelectric signal and the second photoelectric signal to determine the brightness difference of the LED display unit 20 .

Specifically, the first light collector 11 and the second light collector 12 may be modules on an illuminance meter, and the controller may be an electronic device with software that can be installed and run, such as a mobile phone, a tablet computer, and a desktop computer. Illuminance meter (or lux meter) is a measure of light intensity (illuminance), that is, the degree to which an object is illuminated, specifically the ratio of the luminous flux obtained on the surface of the object to the illuminated area. Illuminance meters are usually composed of selenium photovoltaic cells or silicon photovoltaic cells and microammeters. Photovoltaic cells are photoelectric elements that directly convert light energy into electrical energy. When the light hits the surface of the photovoltaic cell, the incident light passes through the metal thin film and reaches the interface between the semiconductor selenium layer and the metal thin film, and a photoelectric effect is generated on the interface. The magnitude of the generated photocurrent is proportional to the illuminance on the light-receiving surface of the photocell. At this time, if an external circuit is connected, a current will flow through, and the current value will be indicated on a microammeter with a lux (LuX) scale. The magnitude of the photocurrent depends on the intensity of the incident light. Therefore, in this embodiment, the first light collector 11 and the second light collector 12 are illuminometer probes.

In this embodiment, after the LED on the LED display unit 20 emits light, after the LED of the LED display unit 20 emits light, with the direction in FIG. 1 as a reference, the first light collector 11 is illuminated on the right side, and the second light collector 11 is illuminated on the right side. 12 is illuminated on the left.

If the LED lamp beads in the LED display unit 20 are not inclined and all emit light normally, the entire LED display unit 20 will emit light evenly. Then, even though the angles at which the lights emitted by the LEDs of the LED display unit 20 are irradiated on the first light collector 11 and the second light collector 12 are not the same, because the first light collector 11 and the second light collector 12 are symmetrical distributed on both sides of the LED display unit 20, so theoretically, after the light emitted by all the LEDs of the LED display unit 20 is irradiated on the first light collector 11 and the second light collector 12, the first light collector 11 and the second light collector 12 The illumination received by the light collector 12 should be equal, that is, the first photoelectric signal and the second photoelectric signal should theoretically be equal.

Therefore, the coincidence of the first photoelectric signal and the second photoelectric signal can be used to determine the yin and yang colors of the LED display unit 20. The greater the difference between the two, the more serious the yin and yang colors of the LED display unit 20 are, and the smaller the difference between the two is. It proves that the yin and yang colors of the LED display unit 20 are lighter. If the two are completely coincident, it proves that the LED display unit 20 emits evenly and there is no yin and yang color phenomenon at all.

In this embodiment, the LED lamp beads in the LED display unit 20 are controlled to emit light. Since the first light collector 11 and the second light collector 12 are symmetrically distributed on both sides of the light emitting surface of the LED display unit 20, the LED lamp beads emit light. The light can be irradiated on the first light collector 11 and the second light collector 12 at the same time. The first light collector 11 and the second light collector 12 respectively convert the respectively received illumination light into a first photoelectric signal and a second photoelectric signal. Then, the controller compares the coincidence degree of the first photoelectric signal and the second photoelectric signal to determine the yin and yang color of the LED display unit 20 .

It can be seen from the above that the LED display unit yin and yang color measuring device provided in this embodiment emits light through the LED lamp beads of the LED display unit 20 and then illuminates the two light collectors 10 at different positions, and then illuminates the first light collector 11 The light on the LED is converted into a first photoelectric signal, and the light irradiated on the second light collector 12 is converted into a second photoelectric signal. By comparing the two photoelectric signals, the yin and yang colors of the LED display unit 20 can be determined. In this embodiment, the luminous condition of the LED display unit can be quickly measured, the detection efficiency is improved, and the detection result is relatively accurate.

In addition, in the LED display unit yin-yang color measuring device provided by this embodiment, the physical positions of the LED display unit 20 and the two light collectors 10 do not need to be adjusted all the time during the test process, thereby reducing the measurement error caused by the change of the physical position. big risk.

In an optional implementation manner, the center normal 111 of the first light collector and the center normal 121 of the second light collector coincide, and the center normal 21 of the light exit surface of the LED display unit and the first light collector The center normals 111 of 111 intersect vertically. Therefore, the first light collector 11 and the second light collector 12 are parallel, and they are respectively perpendicular to the light emitting surface of the LED display unit 20, so that the first light collector 11 and the second light collector 12 receive the LED light The overall angle and area of the light irradiation of the display unit 20 are equal, that is to say, please refer to FIG. 2 for details. It can be seen that the LED lamp beads of the LED display unit 20 are from left to right in the first row to the sixteenth row as an example. The incident angle of the first row of LEDs with respect to the first light collector 11 is a1, and the incident angle with respect to the second light collector 12 is b1; wherein the incidence angle of the 16th row of LEDs with respect to the first light collector 11 is h1, The angle of incidence with respect to the second light collector 12 is i1. Then the incident angle a1 and the incident angle i1 are equal, the incident angle b1 and the incident angle h1 are equal, and the same is true for other columns of LEDs. Therefore, the risk of reducing the coincidence degree of the first photoelectric signal and the second photoelectric signal caused by the angle error and the position error can be reduced, and the detection accuracy can be improved.

For the LED display unit yin and yang color measuring device, there are two methods for evaluating the difference between the first photoelectric signal and the second photoelectric signal.

Specifically, in an optional embodiment, the LEDs in the LED display unit 20 emit light at the same time and then illuminate the first light collector 11, which is converted into a first photoelectric signal; the LEDs in the LED display unit 20 emit light at the same time and then illuminate the first photoelectric signal. On the second light collector 12, it is converted into a second photoelectric signal.

Specifically, all LEDs in the LED display unit 20 are controlled to emit light. After all the LEDs emit light, the first light collector 11 and the second light collector 12 are simultaneously illuminated by the LED display unit 20 .

In this way, the LEDs in the LED display unit 20 are made to emit light once, and the measurement of the yin and yang colors of the entire LED display unit 20 can be completed, and the efficiency is very high.

In this optional embodiment, the difference in brightness of the LED display unit 20 is determined according to the difference between the ratio of the first photoelectric signal and the second photoelectric signal and 1. Specifically, when the coincidence of the first light signal and the second photoelectric signal is higher, that is, the ratio of the two is closer to 1, the difference in brightness between the LEDs in the first area and the LEDs in the second area is smaller, and the LED display unit 20 On the contrary, the greater the difference between the ratio of the first photoelectric signal and the second photoelectric signal and 1, the smaller the difference in brightness between the LEDs in the first area and the LEDs in the second area, and the yin and yang of the LED display unit 20. The color is more serious. In this way, the yin and yang colors of the LED display unit 20 can be easily and quickly evaluated to provide a reference for whether the process needs to be improved.

Specifically, when the ratio δ of the first photoelectric signal and the second photoelectric signal satisfies the following conditions: 1+z≥δ≥1-z, it is determined that the brightness difference of the LED display unit 20 meets the requirements. The specific value of z can be customized, for example, it can be defined as 0.02.

In another optional implementation manner, the LEDs of the LED display unit 20 are controlled to emit light incrementally row by row or column by column, and then the coincidence degrees of the curves formed by the last converted first photoelectric signal and the second photoelectric signal are compared.

Specifically, the method of incrementally controlling the LEDs of the LED display unit 20 to emit light is described in detail below:

In detail, the LED display unit 20 includes N columns of LEDs, where N is a positive integer greater than or equal to 1.

Then, when performing detection, firstly control the LEDs in the 1st to Nth columns of the LED display unit 20, and the LEDs emit light column by column from the 1st column to the Nth column. A row of LEDs glows. That is, the LEDs in the first column emit light; then continue to control the LEDs in the second column to emit light. At this time, the LEDs in the first and second columns are both in the light-emitting state; and then the LEDs in the third column are controlled to emit light. , The LEDs in the 2nd and 3rd columns are all in the light-emitting state; ...; continue to control the LEDs in the N-1 column to emit light, at this time, the LEDs in the 1st to N-1th columns are all in the light-emitting state; continue The LEDs in the Nth column are controlled to emit light, and at this time, the LEDs in the 1st column to the Nth column are all in the light-emitting state. Each time one column of LEDs is controlled to emit light, the first light collector 11 collects data once, and the light emitted by the corresponding LED lamp bead is converted into a first photoelectric signal; the second light collector 12 also collects data once, then the corresponding LED light The light emitted by the beads is converted into a second photoelectric signal.

Finally, the first light collector 11 can convert N first photoelectric signals P1 ₁ ˜P1 _N ; among the N first photoelectric signals P1 ₁ ˜P1 _N , the first photoelectric signal P1 ₁ includes the first column of LEDs that emit light and then convert The first photoelectric signal P1 ₂ includes the photoelectric signals converted after the LEDs in the first and second columns emit light at the same time, and the first photoelectric signal P1 _N includes the photoelectric signals converted after the LEDs in the first to Nth columns emit light at the same time.

And the second light collector 12 can convert N second photoelectric signals P2 ₁ ˜P2 _N ; among the N second photoelectric signals P2 ₁ ˜P2 _N , the second photoelectric signal P2 ₁ includes the converted signal after the first column of LEDs emits light. The photoelectric signal, the second photoelectric signal P2 ₂ includes the photoelectric signal converted after the LEDs in the first column and the second column emit light simultaneously, and the second photoelectric signal _P2N includes the photoelectric signal converted after the LEDs in the 1st to Nth columns emit light simultaneously.

Then, the LEDs in the LED display unit 20 are controlled to be turned off, and then controlled to emit light column by column from the Nth column to the 1st column, and the LEDs of each column keep the light-emitting state after lighting, waiting for the next column of LEDs to emit light. That is, first control the LEDs in the Nth column to emit light; then continue to control the LEDs in the N-1th column to emit light. At this time, the LEDs in the Nth and N-1th columns are both in the light-emitting state; then control the N-2th column. The LED emits light. At this time, the LEDs in the Nth, N-1 and N-2th columns are all in the light-emitting state; ......; continue to control the LEDs in the second column to emit light, at this time, the Nth column to the second The LEDs in the columns are all in the light-emitting state; the LEDs in the first column are continuously controlled to emit light, and at this time, the LEDs in the Nth column to the first column are all in the light-emitting state. Each time one column of LEDs is controlled to emit light, the first light collector 11 collects data once, and the light emitted by the corresponding LED lamp bead is converted into a first photoelectric signal; the second light collector 12 also collects data once, then the corresponding LED light The light emitted by the beads is converted into a second photoelectric signal.

Finally, the first light collector 11 can convert N first photoelectric signals P3 _N to P3 ₁ ; among the N first photoelectric signals P3 _N to P3 ₁ , the first photoelectric signal P3 _N includes the conversion after the LEDs in the Nth column emit light. The photoelectric signal, the first photoelectric signal P3 _N-1 includes the photoelectric signal converted after the LEDs in the Nth column and the N-1th column emit light at the same time, and the first photoelectric signal P3 ₁ includes the Nth column to the 1st column. photoelectric signal.

The first light collector 11 can convert N second photoelectric signals P4 _N to P4 ₁ ; among the N second photoelectric signals P4 _N to P4 ₁ , the second photoelectric signal P4 _N includes the photoelectric converted after the LED of the Nth column emits light. Signal, the second photoelectric signal P4 _N-1 includes the photoelectric signal converted after the LEDs in the Nth and N-1th columns emit light simultaneously, and the second photoelectric signal P4 ₁ includes the photoelectric signals converted after the LEDs in the Nth to 1st columns emit light at the same time. Signal.

Thereby, two groups of first photoelectric signals and two groups of second photoelectric signals can be converted, and each group of first photoelectric signals and each group of second photoelectric signals respectively include a large amount of data, then compare the large amount of first photoelectric signals and second photoelectric signals. When the coincidence of the two photoelectric signals determines the yin and yang colors of the LED display unit 20 , the degree of accuracy is higher, and the yin and yang colors of the LED display unit 20 can be better evaluated.

In detail, the LED display unit 20 includes N rows of LEDs, where N is a positive integer greater than or equal to 1.

Then, when performing detection, firstly control the LEDs in the first row to the Nth row of the LED display unit 20, the LEDs emit light incrementally from the first row to the Nth row, and the LEDs in each row keep the lighting state after lighting, waiting for the next row. LED glows. That is, the LEDs in the first row emit light; then continue to control the LEDs in the second row to emit light. At this time, the LEDs in the first and second rows are both in the light-emitting state; then the LEDs in the third row are controlled to emit light, at this time the first row , The LEDs in the 2nd and 3rd rows are in the light-emitting state; ......; continue to control the LED in the N-1th row to emit light, at this time, the LEDs in the 1st row to the N-1th row are in the light-emitting state; continue The LEDs in the Nth row are controlled to emit light, and at this time, the LEDs in the first row to the Nth row are all in the light-emitting state. Every time one row of LEDs is controlled to emit light, the first light collector 11 collects data once, and the light emitted by the corresponding LED lamp bead is converted into a first photoelectric signal; the second light collector 12 also collects data once, then the corresponding LED light The light emitted by the beads is converted into a second photoelectric signal.

Finally, the first light collector 11 can convert N first photoelectric signals P1 ₁ ˜P1 _N ; among the N first photoelectric signals P1 ₁ ˜P1 _N , the first photoelectric signal P1 ₁ includes the conversion after the first row of LEDs emits light. The first photoelectric signal P12 includes the photoelectric signal converted after the LEDs in the first row and the second row emit light at the same time, and the first photoelectric signal _P1N includes the photoelectric signal converted after the LEDs in the first row to the _Nth row emit light at the same time.

And the second light collector 12 can convert N second photoelectric signals P2 ₁ ˜P2 _N ; among the N second photoelectric signals P2 ₁ ˜P2 _N , the second photoelectric signal P2 ₁ includes the converted signal after the first row of LEDs emits light. The photoelectric signal, the second photoelectric signal P2 ₂ includes the photoelectric signal converted after the LEDs in the first row and the second row emit light simultaneously, and the second photoelectric signal _P2N includes the photoelectric signal converted after the LEDs in the first row to the Nth row emit light at the same time.

Then, the LEDs in the LED display unit 20 are controlled to be turned off, and then the LEDs in the Nth row to the 1st row are controlled to emit light incrementally row by row, and the LEDs in each row remain in the lighting state after lighting, waiting for the LEDs in the next row to emit light. That is, first control the LEDs in the Nth row to emit light; then continue to control the LEDs in the N-1th row to emit light. At this time, the LEDs in the Nth and N-1th rows are both in the light-emitting state; then control the N-2th row. The LED emits light, at this time the LEDs in the Nth row, the N-1th row and the N-2th row are all in the lighting state; ......; continue to control the LED in the 2nd row to emit light, at this time the Nth row to the 2nd row The row LEDs are all in the light-emitting state; continue to control the first row of LEDs to emit light, at this time, the Nth row to the first row LEDs are all in the light-emitting state. Every time one row of LEDs is controlled to emit light, the first light collector 11 collects data once, and the light emitted by the corresponding LED lamp bead is converted into a first photoelectric signal; the second light collector 12 also collects data once, then the corresponding LED light The light emitted by the beads is converted into a second photoelectric signal.

Finally, the first light collector 11 can convert N first photoelectric signals P3 _N to P3 ₁ ; among the N first photoelectric signals P3 _N to P3 ₁ , the first photoelectric signal P3 _N includes the conversion after the LED of the Nth row emits light. The first photoelectric signal P3 _N-1 includes the photoelectric signal converted after the LEDs in the Nth row and the N-1th row emit light at the same time, and the first photoelectric signal P3 ₁ includes the Nth row to the 1st row. photoelectric signal.

The first light collector 11 can convert N second photoelectric signals P4 _N to P4 ₁ ; among the N second photoelectric signals P4 _N to P4 ₁ , the second photoelectric signal P4 _N includes the photoelectric converted after the LED of the Nth row emits light. Signal, the second photoelectric signal P4 _N-1 includes the photoelectric signal converted after the LEDs of the Nth row and the N-1th row emit light at the same time, and the second photoelectric signal P4 ₁ includes the Nth row to the first row. Signal.

Regardless of whether the LED light-emitting is controlled incrementally row by row or column-by-column incremental control, it is finally converted into N first photoelectric signals P1 ₁ ˜P1 _N , N second photoelectric signals P2 ₁ ˜P2 _N , and N first photoelectric signals P3 _N ˜P3 ₁ and N second photoelectric signals P4 _N ˜P4 ₁ . Next, the N first photoelectric signals P1 ₁ ˜P1 _N are used to generate a first curve; the N second photoelectric signals P2 ₁ ˜P2 _N are used to generate a second curve; the N first photoelectric signals P3 _N ˜P3 ₁ are used to generate the first curve Three curves; a fourth curve is generated by using the N second photoelectric signals P4 _N to P4 ₁ .

Please refer to FIG. 3 , it can be seen that the LED lamp beads of the LED display unit 20 are respectively from right to left in the 16th row to the first row as an example, wherein the incident angle of the first row of LEDs with respect to the first light collector 11 is a , the incident angle with respect to the second light collector 12 is b; wherein the incident angle of the 16th column LED with respect to the first light collector 11 is h, and the incident angle with respect to the second light collector 12 is i. Then the incident angle a and the incident angle i are equal, and the incident angle b and the incident angle h are equal.

The incident angle of the LEDs in the second row with respect to the first light collector 11 is c, and the incident angle with respect to the second light collector 12 is e; the incidence angle of the LEDs in the 15th row with respect to the first light collector 11 is e. is f, and the angle of incidence with respect to the second light collector 12 is g. Then the incident angle c and the incident angle g are equal, and the incident angle e and the incident angle f are equal. The same is true for other column LEDs.

As a result, the LEDs finally emit light from left to right column by column incrementally and illuminate the light intensity on the first light collector 11 in turn, and the LEDs incrementally emit light column by column from right to left and illuminate the light on the second light collector 12 in turn. Intensity should theoretically be equal in sequence (based on equal incidence angle a and incidence angle i, and equal incidence angle c and incidence angle g). The final light intensity that the LEDs emit light column by column from left to right and sequentially illuminate the second light collector 12, and the light intensity that the LEDs incrementally emit light column by column from right to left and illuminate the first light collector 11 in turn is theoretically should be equal in order (based on the equality of the incident angle b and the incident angle h, and the incident angle e and the incident angle f being equal).

Then, according to the above principle, theoretically, the first curve and the fourth curve should be completely coincident, and the second curve and the third curve should be completely coincident.

Therefore, finally, the brightness difference of the LED display unit 20 can be determined according to the coincidence degree of the first curve and the fourth curve, and the coincidence degree of the second curve and the third curve.

Thus, the brightness difference of the LED display unit 20 can be quickly determined by using a large amount of data of the first photoelectric signal and the second photoelectric signal. Specifically, when the first curve and the fourth curve have a high degree of coincidence, and the second curve and the third curve have a high degree of coincidence, it proves that the smaller the brightness difference of the LED display unit 20 is, the lighter the yin and yang colors are. Conversely, when the degree of coincidence between the first curve and the fourth curve is low, or when the degree of overlap between the second curve and the third curve is low, it proves that the greater the difference in brightness of the LED display unit 20, the more serious the yin and yang colors are. In this way, the four curves are used to compare the coincidence degree two by two, so that the evaluation result can be more accurate.

In an optional embodiment, before using the LED display unit yin and yang color measuring device for testing, the LED display unit yin and yang color measuring device can also be calibrated, so that the positions of each component are accurate, thereby improving the detection accuracy.

Specifically, please refer to FIG. 4 , the fixed substrate 50 is disposed between the first light collector 11 and the second light collector 12 , and the calibration light source 50 is disposed on the fixed substrate 50 . So that: the center normal of the calibration light source 50 coincides with the center normal of the fixed substrate 50; a connecting line is formed between the center of the first light collector 11 and the center of the second light collector 12, and the center normal of the calibration light source 50 and The connecting line is vertical, and the center normal of the calibration light source 50 intersects with the midpoint of the connecting line.

That is, please refer to FIG. 4 , in the figure, H1, H2, L1 and L2 can all be measured, so just make sure that L1=L2, H1=H2. Then according to the Pythagorean theorem, it can be concluded that: tan(m)=L1/H1, tan(n)=L2/H2, it can be concluded that the angle m and the angle n are equal, so that the LED on the LED display unit 20 can be guaranteed When emitting light, the light intensity irradiated on the first light collector 11 and the second light collector 12 is theoretically equal.

In detail, before the LED display unit 20 is placed on the first light collector 11 and the second light collector 12, the fixing substrate 50 is arranged between the first light collector 11 and the second light collector 12, and then the fixing substrate 50 is placed between the first light collector 11 and the second light collector 12 The calibration light source 50 is arranged on the base plate 50 .

Next, the calibration light source 50 is controlled to emit light. At this time, the light of the calibration light source 50 is incident on the first light collector 11 and the second light collector 12, and the first light collector 11 and the second light collector 12 convert the irradiated light respectively. For the first calibration photoelectric signal A1 and the second calibration photoelectric signal B1. Then adjust the luminous intensity of the calibration light source 50, continue to collect the first calibration photoelectric signal A2 and the second calibration photoelectric signal B2, until the Q first calibration photoelectric signals A1 to A and _Q second calibration photoelectric signals B1 to B are collected _Q. where Q is a positive integer greater than or equal to 1.

Then calculate A _total =A1+A2+...+A _Q , B _total =B1+B2+...+B _Q , under the condition that the error rate △E=A _total /B _{total is} close to 1 , the positions of the first light collector 11 , the second light collector 12 and the fixed substrate 50 are adjusted in place. The fixed substrate 50 and the calibration light source 50 can be taken out, and then the LED display unit 20 can be disposed between the first light collector 11 and the second light collector 12 . As a result, the detection accuracy is improved and the detection error rate is reduced.

Then, when determining the brightness difference of the LED display unit 20 according to the difference between the ratio of the first photoelectric signal and the second photoelectric signal and 1, the error rate ΔE also needs to be considered.

That is, in the case where the ratio δ of the first photoelectric signal and the second photoelectric signal satisfies the following conditions: 1+z≥δ≥1-z, it is determined that the brightness difference of the LED display unit 20 meets the requirements, which can be specifically: 1+ In the case of z≥δ+(1-ΔE)≥1-z, it is determined that the brightness difference of the LED display unit 20 meets the requirements. Of course, if the positions of the first light collector 11, the second light collector 12 and the LED display unit 20 are absolutely accurate, ΔE=1, then 1+z≥δ+(1-ΔE)≥1- z and 1+z≥δ≥1-z are the same.

Finally, it needs to be emphasized that whether a light collector 10 and the light-emitting surface of the LED display unit 20 are arranged to face each other, or the first light collector 11 and the second light collector 12 are arranged with two light collectors 10 respectively located in the LED On both sides of the light emitting surface of the display unit 20 , the light collectors 10 are respectively fixed by a fixing device 30 . The fixing device 30 can be a fixing plate or the like.

The following is a detailed description of an LED display unit yin and yang color measuring device provided by another embodiment of the present application, please refer to FIGS. 5 to 7 , the LED display unit yin and yang color measuring device includes a light collector 10; the light collector 10 faces the LED display unit. 20 light-emitting surface.

Wherein, after the light emitted by the LEDs in the first area of the LED display unit 20 is irradiated on the light collector 10, a photoelectric effect occurs on the light collector 10 and is converted into a first photoelectric signal; in the second area of the LED display unit 20 After the light emitted by the LED is irradiated on the light collector 10, a photoelectric effect occurs on the light collector 10, and is converted into a second photoelectric signal. The LEDs in the first area and the LEDs in the second area are symmetrically distributed with the projection of the light collector 10 on the LED display unit 20 as the center. Next, the brightness difference of the LED display unit 20 can be determined according to the coincidence degree of the first photoelectric signal and the second photoelectric signal.

It can be understood that a controller may also be included, and the controller may be electrically connected to the light collector 10, the light collector 10 may send the first photoelectric signal and the second photoelectric signal to the controller, and the controller uses the first photoelectric signal and the second photoelectric signal. The second photoelectric signal determines the brightness difference of the LED display unit 20 .

It can also be understood that the LEDs in the above-mentioned first area and the second area may be part of the LEDs in the LED display unit. Taking FIG. 5 as an example, the LEDs in the first area may include 2/3 from top to bottom. , 1/2, 1/4, 1/6, etc. number of LEDs, the LEDs in the second area may include 2/3, 1/2, 1/4, 1/6, etc. number of LEDs from bottom to top As long as the LEDs in the first area and the LEDs in the second area are symmetrically distributed with the projection of the light collector 10 as the boundary, this method can be used to measure the luminous uniformity of the LEDs in the first area and the LEDs in the second area.

Specifically, the light collector 10 can be a module on an illuminance meter, and the controller can be an electronic device with software that can be installed and can run the software, such as a mobile phone, a tablet computer, and a desktop computer.

As mentioned above, if the LED lamp beads in the LED display unit 20 are not inclined and all emit light normally, the entire LED display unit 20 will emit light uniformly. Then the illuminance of the LED lamp beads in the first area and the second area should theoretically be equal. Therefore, the coincidence of the first photoelectric signal and the second photoelectric signal can be used to determine the yin and yang colors of the LED display unit 20. The greater the difference between the two, the more serious the yin and yang colors of the LED display unit 20 are, and the smaller the difference between the two is. It proves that the yin and yang colors of the LED display unit 20 are lighter. If the two are completely coincident, it proves that the LED display unit 20 emits evenly and there is no yin and yang color phenomenon at all.

In this embodiment, specifically, the LED lamp beads in the first area of the LED display unit 20 can be controlled to emit light. Since the light collector 10 faces the light-emitting surface of the LED display unit 20, after the LED lamp beads in the first area emit light, their output The incident light is irradiated on the light collector 10, and the light collector 10 converts the light into a first photoelectric signal; then the LED lamp beads in the first area are turned off, and then the LED lamp beads in the second area are controlled to emit light. After the LED lamp beads inside emit light, the emitted light is irradiated on the light collector 10, and the light collector 10 also converts the light into a second photoelectric signal. Then, the controller compares the coincidence degree of the first photoelectric signal and the second photoelectric signal to determine the yin and yang color of the LED display unit 20 .

It can be seen from the above that the LED display unit yin and yang color measuring device provided by this embodiment controls the two parts of the LEDs in the symmetrical part to emit light twice; then the light irradiated on the light collector 10 is converted after the two parts of the LED lamp beads emit light. It is the first photoelectric signal and the second photoelectric signal. By comparing the two photoelectric signals, the yin and yang colors of the regions where the two parts of the LED lamp beads are located in the LED display unit 20 can be determined. In this embodiment, the luminous condition of the LED display unit can be quickly measured without manual participation in the whole measurement process, the detection efficiency is improved, and the detection result is relatively accurate.

In addition, in the LED display unit yin-yang color measuring device provided by this embodiment, the physical positions of the LED display unit 20 and the light collector 10 do not need to be adjusted all the time during the test process, thereby reducing the risk of large measurement errors caused by changes in the physical positions .

In an optional embodiment, please refer to FIG. 6 , the center normal 101 of the light collector coincides with the center normal 21 of the light emitting surface of the LED display unit. Therefore, the light emitting surfaces of the light collector 10 and the LED display unit 20 are parallel, and the center of the light collector 10 and the center of the light emitting surface of the LED display unit 20 are at the same height. Therefore, no matter after the LED lamp beads of the LED display unit 20 are divided into two halves, it is only necessary to control the LED lamp beads in the first area of the LED display unit to emit light, and then control the LED lamp beads in the second area to emit light, that is, to emit light twice, that is, The measurement of the entire LED display unit can be completed.

In an optional embodiment, please continue to refer to FIG. 6 and FIG. 7 , the light-emitting surface of the LED display unit 20 is divided into a first area and a second area with the longitudinal center axis 23 as the dividing line; The light-emitting surface is divided into a first area and a second area with its transverse central axis 22 as the dividing line; the longitudinal central axis 23 and the central normal 21 of the light-emitting surface of the LED display unit intersect vertically, and the transverse central axis 22 and the longitudinal central axis 23 are perpendicular . That is, the LED lamp beads on the LED display unit 20 can be equally divided into two parts according to a row, and can also be divided into two parts according to a column.

Therefore, the LED lamp beads on the LED display unit 20 are equally divided into two parts with the light-receiving lens as the limit, so that the incident angles of the two parts of the LED lamp beads are kept the same, then the two parts of the light irradiated on the light collector 10 are received The difference caused by the influence of the position distribution of the LED lamp bead is smaller, or even close to none. Therefore, even if there is a difference between the two parts of the light irradiated on the light collector 10, it is due to the difference in the luminous properties of the LED lamp bead itself, so that the measurement of the negative and positive colors of the LED display unit 20 is more accurate.

Based on the above distribution of LED lamp beads in the LED display unit 20 , there may be two methods for evaluating the difference between the first photoelectric signal and the second photoelectric signal.

Specifically, in an optional implementation manner, the first photoelectric signal may include a photoelectric signal converted from all LEDs in the first area to emit light at the same time, and the second photoelectric signal may include a photoelectric signal converted from all LEDs in the second area to emit light at the same time. photoelectric signal.

In detail, first control all the LEDs in the first area on the LED display unit 20 to emit light, and after the light emitted by the LEDs in the first area is irradiated on the light collector 10 and converted into a first photoelectric signal, control the LEDs in the first area. The LEDs are turned off, and then all the LEDs in the second area are controlled to emit light. At this time, the light emitted by the LEDs in the second area is irradiated on the light collector 10 and converted into a second photoelectric signal.

Therefore, the LEDs in the LED display unit 20 are made to emit light twice, so that the measurement of the yin and yang colors of the entire LED display unit 20 can be completed, and the efficiency is very high.

Specifically, when the ratio of the first photoelectric signal and the second photoelectric signal satisfies the following conditions: 1+z≥δ≥1-z, it is determined that the brightness difference of the LED display unit 20 meets the requirements. The specific value of z can be customized, for example, it can be defined as 0.02.

In detail, the LED display unit 20 includes N columns of LEDs; the first area includes LEDs from columns 1 to N/2, and the second area includes LEDs from columns N/2+1 to N; N is greater than or A positive integer equal to 1. In FIG. 7 , columns 1 to N are sequentially from left to right.

Then, when performing detection, firstly control the LEDs in the 1st to N/2th columns in the first area to start emitting light column by column from left to right, and keep the light-emitting state after emitting light. That is, first control the LEDs in the first column to emit light; then continue to control the LEDs in the second column to emit light, at this time, the LEDs in the first and second columns are both in the light-emitting state; then control the LEDs in the third column to emit light, at this time the first The LEDs in the 1st, 2nd and 3rd columns are all in the light-emitting state; ......; continue to control the LEDs in the N/2-1 column to emit light, at this time, the LEDs in the 1st to N/2-1th columns All are in the light-emitting state; continue to control the LEDs in the N/2th column to emit light, at this time, all the LEDs in the 1st to N/2th columns are in the light-emitting state. Each time one column of LEDs is controlled to emit light, the light emitted by the related LEDs is converted into a first photoelectric signal.

Finally, N/2 first photoelectric signals P ₁ ˜PN/ ₂ can be converted. Wherein, the _first photoelectric signal P1 includes the photoelectric signal converted after the LEDs in the first column emit light, the first photoelectric signal P2 includes the photoelectric signals converted after the LEDs in the first column and the _second column emit light at the same time, The first photoelectric signal P _N/2 includes photoelectric signals converted after the LEDs in the 1st to N/2th columns emit light at the same time.

Then, the LEDs in the first column to the N/2th column in the first area are all turned off, and then the Nth column LED to the N/2+1th column in the second area is controlled to start to emit light column by column from right to left. Keep glowing after glowing. That is, first control the LEDs in the Nth column to emit light; then continue to control the LEDs in the N-1th column to emit light. At this time, the LEDs in the Nth and N-1th columns are both in the light-emitting state; then control the N-2th column. The LED emits light. At this time, the LEDs in the Nth column, the N-1th column and the N-2th column are all in the light-emitting state; ......; continue to control the N/2+2 column LED to emit light, at this time the Nth column The LEDs in the columns to N/2+2 are all in the light-emitting state; continue to control the LEDs in the N/2+1 column to emit light. At this time, the LEDs in the N-th to N/2+1 columns are all in the light-emitting state. Each time one column of LEDs is controlled to emit light, the light emitted by the related LEDs is converted into a second photoelectric signal.

Finally, N/2 second photoelectric signals P _N to P _N/2+1 can be converted. Wherein, the second photoelectric signal P _N includes the photoelectric signal converted after the LED in the Nth column emits light, the second photoelectric signal P _N-1 includes the photoelectric signal converted after the LED in the Nth column and the N-1th column emit light at the same time, ... ..., the second photoelectric signal P _N/2+1 includes photoelectric signals converted after the LEDs in the Nth column to the N/2+1th column emit light at the same time.

Therefore, when the LED lamp beads in the LED display unit 20 are controlled to emit light in a row-by-column increment, the controller can collect a large amount of data of the first photoelectric signal and the second photoelectric signal, and then compare the large amount of the first photoelectric signal. When the degree of coincidence with the second photoelectric signal determines the yin and yang colors of the LED display unit 20 , the accuracy will be higher, so that the yin and yang colors of the LED display unit 20 can be better evaluated.

The way of incrementally controlling the LEDs of the LED display unit 20 to emit light is described in detail as follows:

In detail, the LED display unit 20 includes N rows of LEDs; the first area includes the 1st row to the N/2th row of LEDs, and the second area includes the N/2+1th row to the Nth row of LEDs; N is greater than or A positive integer equal to 1. In FIG. 7 , from top to bottom are the first row to the Nth row.

Then, when performing detection, firstly control the LEDs in the first row to the N/2th row in the first area to start emitting light gradually from top to bottom, and keep the light-emitting state after emitting light. That is, first control the LEDs in the first row to emit light; then continue to control the LEDs in the second row to emit light. At this time, the LEDs in the first and second rows are both in the light-emitting state; then control the LEDs in the third row to emit light. The LEDs in row 1, row 2 and row 3 are all in the light-emitting state; ...; continue to control the LEDs in the N/2-1 row to emit light, at this time, the LEDs in the first row to the N/2-1 row are in the light-emitting state; continue to control the LEDs in the N/2th row to emit light, at this time, the LEDs in the 1st row to the N/2th row are all in the light-emitting state. Each time one row of LEDs is controlled to emit light, the light emitted by the related LEDs is converted into a first photoelectric signal.

Finally, N/2 first photoelectric signals P1 to PN/2 can be converted. Wherein, the first photoelectric signal P1 includes the photoelectric signal converted after the LEDs in the first row emit light, the first photoelectric signal P2 includes the photoelectric signals converted after the LEDs in the first row and the second row emit light at the same time, ..., the first The photoelectric signal PN/2 includes the photoelectric signals converted after the LEDs in the first row to the N/2th row emit light simultaneously.

Next, the LEDs in the first row to the N/2 row in the first area are all turned off, and then the LEDs in the Nth row to the N/2+1 row in the second area are controlled to increase row by row from bottom to top to start emitting light. Keep glowing after that. That is, first control the LEDs in the Nth row to emit light; then continue to control the LEDs in the N-1th row to emit light. At this time, the LEDs in the Nth and N-1th rows are both in the light-emitting state; then control the N-2th row. The LED emits light, at this time the LEDs in the Nth row, the N-1th row and the N-2th row are all in the lighting state; ......; Continue to control the N/2+2 row LEDs to emit light, at this time the Nth row The LEDs from the row to the N/2+2th row are all in the light-emitting state; continue to control the N/2+1th row of LEDs to emit light, at this time, the Nth to N/2+1th row LEDs are all in the light-on state. Each time one row of LEDs is controlled to emit light, the light emitted by the related LEDs is converted into a second photoelectric signal.

Finally, N/2 second photoelectric signals PN to PN/2+1 can be converted. Wherein, the second photoelectric signal PN includes the photoelectric signal converted after the LEDs in the Nth row emit light, the second photoelectric signal PN-1 includes the photoelectric signals converted after the LEDs in the Nth row and the N-1th row emit light at the same time, … ., the second photoelectric signal PN/2+1 includes the photoelectric signals converted after the LEDs in the Nth row to the N/2+1th row emit light simultaneously.

Therefore, when the LED lamp beads in the LED display unit 20 are controlled incrementally row by row to emit light, the controller can collect a large amount of data of the first photoelectric signal and the second photoelectric signal, and then compare the large amount of the first photoelectric signal. When the degree of coincidence with the second photoelectric signal determines the yin and yang colors of the LED display unit 20 , the accuracy will be higher, so that the yin and yang colors of the LED display unit 20 can be better evaluated.

Regardless of whether the LED light-emitting is controlled incrementally row by row or column-by-column incremental control is used, it is finally converted into N/2 first photoelectric signals P ₁ _˜PN/2 and N/2 second photoelectric signals P _N _{˜PN/2 +1} . Then the controller correspondingly receives N/2 first photoelectric signals P ₁ _-PN/2 and N/2 second photoelectric signals P _N _-PN/2+1 ; A photoelectric signal P ₁ _-PN/2 generates a first curve, and N/2 second photoelectric signals P _N _/2+1 -PN are used to generate a second curve; finally, according to the coincidence of the first curve and the second curve The degree of brightness determines the difference in brightness of the LED display unit 20 .

Thus, the brightness difference of the LED display unit 20 can be quickly determined by using a large amount of data of the first photoelectric signal and the second photoelectric signal. Specifically, when the first curve and the second curve have a high degree of coincidence, it proves that the smaller the difference in brightness between the LEDs in the first area and the LEDs in the second area, the lighter the yin and yang colors of the LED display unit 20 are. Conversely, when the first curve and the second curve have a low degree of coincidence, it proves that the greater the difference in brightness between the LEDs in the first area and the LEDs in the second area, the more serious the yin and yang colors of the LED display unit 20 are.

It should be understood by those skilled in the art that although the above-mentioned embodiments of the present application all take N rows or columns of LEDs as an example, where N is a positive integer greater than or equal to 1, then N may be an even number, or it may be will be odd.

In an optional implementation manner, if N is an odd number, when N rows or columns of LED lamp beads are divided into the first area and the second area, the division is performed in a rounded manner. For example, if the number of columns of LED lamp beads is 9, that is, N is equal to 9, then N/2 is equal to 5 according to the rounding calculation method. That is to say, when the LED lamp beads in the first row to the N/2 row in the first region are controlled to emit light in a row-by-row incremental manner, the LED lamp beads in the first to fifth rows are controlled incrementally row by row to emit light. When the LED lamp beads in the Nth row to the N/2th row in the second region are controlled to emit light column by column, the LED lamp beads in the 9th column to the 6th column are controlled incrementally column by column to emit light.

Because there are generally a very large number of LED lamp beads on the LED display unit, the influence of one column or row of LEDs on the illuminance difference between the entire first area and the second area is very small and can be ignored. There are five columns of LEDs and four columns of LEDs in the second area, but the illuminance of the first area and the second area will not be affected. Therefore, the LED display unit 20 with an odd number of rows or columns of LEDs can still be provided by any embodiment of the present application. device to be tested.

Of course, in another optional implementation, those skilled in the art can understand that, when the number of columns or rows of LED lamp beads is odd, the LED lamp beads located in the middlemost column or row may belong to the first At the same time as the area, it also belongs to the second area, ie. Continuing to take 9 columns of LED lamp beads as an example, you can first control the LEDs in the 1st to 5th columns to emit light column by column, and then turn off the LEDs in the 1st to 5th columns; then control the 9th to 5th columns. The LEDs emit light incrementally column by column. As a result, the number of LED lamp beads in the first area and the number of LED lamp beads in the second area are equal, and the detection accuracy is improved.

In an optional embodiment, please refer to FIG. 7, before using the LED display unit yin and yang color measuring device for testing, the LED display unit yin and yang color measuring device can also be calibrated, so that the positions of each component are accurate, thereby improving the detection accuracy .

Specifically, the light collector 10 is circular. The calibration process is as follows: calibrating the center of the light-emitting surface of the LED display unit 20 , and displaying a circular light area 24 on the LED display unit 20 with the center of the light-emitting surface of the LED display unit 20 as the center. Adjust the center of the circular projection of the light collector 10 on the light-emitting surface of the LED display unit 20 to coincide with the center of the circular light area 24 .

Please refer to FIG. 6 , that is, H1 , L1 and L2 can be measured, and the distance L1 = L2 in the figure. Then according to the Pythagorean theorem, it can be known that the angle a and the angle b are equal. Therefore, it can be ensured that the intensities of the LED light in the first area and the LED light in the second area irradiating on the light collector 10 are theoretically equal, reducing the risk that the physical location affects the measurement accuracy.

In detail, a circle of 2*2 pixels can be displayed on the light-emitting surface of the LED display unit 20 with its center as the center, that is, the LEDs of the four pixels around the center of the light-emitting surface of the LED display unit 20 are controlled to emit light. , after the part of the LED emits light, a circular light area 24 is formed on the light emitting surface of the LED display unit 20 . Then, the light collector 10 is adjusted so that the circular projection of the light collector 10 and the above-mentioned circular light area 24 are concentric.

At this time, the light-emitting surfaces of the light collector 10 and the LED display unit 20 are parallel, and the center of the light collector 10 and the center of the light-emitting surface of the LED display unit 20 are at the same height. As a result, the position of each component is accurate, which is beneficial to improve the accuracy of the detection result.

Referring to FIG. 8 , based on the above-mentioned two devices for measuring the negative and positive colors of the LED display unit 20 , the present application further provides a method for measuring the negative and positive colors of the LED display unit 20 in a real-time manner.

The method for measuring the yin and yang colors of the LED display unit 20 includes:

A first photoelectric conversion signal is received.

A second photoelectric conversion signal is received.

The brightness difference of the LED display unit 20 is determined according to the coincidence degree of the first photoelectric signal and the second photoelectric signal. In this embodiment, the yin and yang colors of the LED display unit 20 can be determined by comparing the two photoelectric signals. In this embodiment, the light emission of the LED display unit 20 can be quickly measured without manual participation in the measurement process, the detection efficiency is improved, and the detection result is relatively accurate.

Specifically, the above method is applied to a device including a first light collector 1111 and a second light collector 1212, and the first light collector 1111 and the second light collector 1212 are respectively located on both sides of the light emitting surface of the LED display unit 20. when measuring the device.

Wherein, after the light emitted by the LED in the LED display unit 20 is irradiated on the first light collector 1111, a photoelectric effect occurs on the first light collector 1111 and is converted into the above-mentioned first photoelectric signal; the light emitted by the LED in the LED display unit 20 After the light is irradiated on the second light collector 1212, a photoelectric effect occurs on the second light collector 1212, and is converted into the above-mentioned second photoelectric signal.

The implementation process of the method has been described in detail in the measurement device including the first light collector 1111 and the second light collector 1212 , and details are not repeated here.

In an optional embodiment, the above method is applied to include a first light collector 1111 and a second light collector 1212, and the first light collector 1111 and the second light collector 1212 are respectively located in the LED display unit 20. When measuring devices on both sides of the light-emitting surface:

Receiving the first photoelectric conversion signal and receiving the second photoelectric conversion signal includes: receiving the first photoelectric conversion signal and the second photoelectric conversion signal respectively converted after the LEDs in the LED display unit 20 emit light at the same time; Determining the brightness difference of the LED display unit 20 by the coincidence of the photoelectric signals includes: determining the brightness difference of the LED display unit 20 according to the ratio of the first photoelectric signal and the second photoelectric signal and the difference of 1.

In an optional implementation manner, the LED display unit 20 includes N columns of LEDs, where N is a positive integer greater than or equal to 1; receiving the first photoelectric conversion signal includes: respectively receiving the first to Nth columns of LEDs to emit light column by column. Then, the converted N first photoelectric signals P1 ₁ ˜P1 _N and the converted N first photoelectric signals P3 _N ˜P3 ₁ respectively; wherein, the first photoelectric signals P1 ₁ include the converted signals after the LEDs in the first column emit light. The photoelectric signal, the first photoelectric signal P12 includes the photoelectric signal converted after the LEDs in the first column and the second column emit light at the same time, and the first photoelectric signal _P1N includes the photoelectric signal converted after the LEDs in the 1st to _Nth columns emit light at the same time; A photoelectric signal P3N includes the photoelectric signal converted after the LED in the Nth column emits light, the first photoelectric signal P3N _-1 includes the photoelectric signal converted after the LED in the Nth column and the _N -1th column emit light at the same time, and the first photoelectric signal P3 ₁ It includes the photoelectric signals converted after the LEDs in the Nth column to the 1st column emit light at the same time.

In an optional implementation manner, the LED display unit 20 includes N rows of LEDs, where N is a positive integer greater than or equal to 1; receiving the first photoelectric conversion signal includes: respectively receiving the first row to the Nth row of LEDs to emit light incrementally row by row Then, the converted N first photoelectric signals P1 ₁ ˜P1 _N and the converted N first photoelectric signals P3 _N ˜P3 ₁ respectively; wherein, the first photoelectric signal P1 ₁ includes the converted signal after the LED in the first row emits light. The photoelectric signal, the first photoelectric signal P1 ₂ includes the photoelectric signal converted after the LEDs in the first row and the second row emit light at the same time, and the first photoelectric signal P1 _N includes the photoelectric signal converted after the LEDs in the first row to the Nth row are illuminated at the same time; A photoelectric signal P3N includes the photoelectric signal converted after the LEDs in the _Nth row emit light, and the first photoelectric signal P3N _-1 _includes the photoelectric signals converted after the LEDs in the Nth row and the N-1th row emit light at the same time. The first photoelectric signal P31 Including the photoelectric signals converted after the LEDs in the Nth row to the 1st row emit light at the same time.

In an optional implementation manner, determining the brightness difference of the LED display unit 20 according to the coincidence degree of the first photoelectric signal and the second photoelectric signal includes: generating a first curve by using the N first photoelectric signals P1 ₁ -P1 _N ; The N second photoelectric signals P2 ₁ ˜P2 _N generate the second curve; the N first photoelectric signals P3 _N ˜P3 ₁ are used to generate the third curve; the N second photoelectric signals P4 _N ˜P4 ₁ are used to generate the fourth curve; The brightness difference of the LED display unit 20 is determined according to the coincidence degree of the first curve and the fourth curve, and the coincidence degree of the second curve and the third curve.

The implementation process of the measurement method in the above-mentioned embodiment has been described in detail in the measurement device including the first light collector 1111 and the second light collector 1212 , and will not be repeated here.

When the above method is applied to a measuring device including a light collector 1010, the light collector 1010 faces the light-emitting surface of the LED display unit 20:

Wherein, after the light emitted by the LEDs in the first area of the LED display unit 20 is irradiated on the light collector 1010, a photoelectric effect occurs on the light collector 1010, and is converted into the above-mentioned first photoelectric signal; the second area of the LED display unit 20 After the light emitted by the inner LED is irradiated on the light collector 1010, a photoelectric effect occurs on the light collector 1010, and is converted into the above-mentioned second photoelectric signal.

In an optional implementation manner, the light-emitting surface of the LED display unit 20 is divided into a first area and a second area with its longitudinal central axis as the dividing line; or, the light-emitting surface of the LED display unit 20 is divided by its transverse central axis Divided into a first area and a second area; the longitudinal center axis is perpendicular to the center normal of the light-emitting surface of the LED display unit 20, and the transverse center axis is perpendicular to the longitudinal center axis; the first photoelectric conversion signal is received, and the second photoelectric conversion signal is received The method includes: receiving the first photoelectric conversion signal converted after the LEDs in the first area emit light simultaneously; receiving the second photoelectric conversion signal converted by the LEDs in the second area simultaneously emitting light; according to the first photoelectric signal and the second photoelectric signal Determining the brightness difference of the LED display unit 20 includes: determining the brightness difference of the LED display unit 20 according to the ratio of the first photoelectric signal and the second photoelectric signal and the difference of 1.

In an optional embodiment, the light-emitting surface of the LED display unit 20 is divided into a first area and a second area with its longitudinal central axis as the dividing line; the light-emitting surface of the LED display unit 20 is divided into In the case of one area and the second area: the LED display unit 20 includes N columns of LEDs; the first area includes LEDs from columns 1 to N/2, and the second area includes columns N/2+1 to N Column LED; N is a positive integer greater than or equal to 1; when the LED display unit 20 includes N columns of LEDs: receiving the first photoelectric conversion signal includes: receiving the first to N/2 column LEDs in the first area one by one The columns emit light incrementally, and the converted N/2 first photoelectric signals P ₁ to P _N/2 ; the first photoelectric signal P ₁ includes the photoelectric signals converted after the first column of LEDs emit light, and the first photoelectric signal P ₂ includes the first photoelectric signal P 1 ～P N/2 . The photoelectric signals converted after the LEDs in the column and the second column emit light simultaneously, the first photoelectric signal P _N/2 includes the photoelectric signals converted after the LEDs in the 1st to N/2th columns emit light at the same time; receiving the second photoelectric conversion signal includes: receiving After the LEDs in the Nth column to the N/2+1th column in the second area emit light incrementally column by column, the converted N/2 second photoelectric signals P _N to P _N/2+1 ; the second photoelectric signals P _N include The photoelectric signal converted after the LEDs in the Nth column emit light, the second photoelectric signal P _N-1 includes the photoelectric signals converted after the LEDs in the Nth column and the N-1th column emit light at the same time, and the second photoelectric signal P _N/2+1 includes the first photoelectric signal The photoelectric signals converted after the LEDs in the N columns to the N/2+1 column emit light simultaneously.

In an optional embodiment, the light emitting surface of the LED display unit 20 is divided into a first area and a second area with its transverse central axis as a dividing line; the light emitting surface of the LED display unit 20 is divided into a In the case of one area and the second area: the LED display unit 20 includes N rows of LEDs, the first area includes the first to N/2th rows of LEDs, and the second area includes N/2+1th to Nth rows Row of LEDs; N is a positive integer greater than or equal to 1; in the case that the LED display unit 20 includes N rows of LEDs: receiving the first photoelectric conversion signal includes: receiving the first to N/2th row of LEDs in the first area one by one After the rows of LEDs emit light incrementally, N/2 first photoelectric signals P ₁ to P _N/2 are converted; the first photoelectric signal P ₁ includes the photoelectric signals converted after the LEDs in the first row emit light, and the first photoelectric signal P ₂ includes the first photoelectric signal P 1 ˜P N/2 . The photoelectric signals converted after the LEDs in the 1st row and the 2nd row emit light at the same time, the first photoelectric signal P _N/2 includes the photoelectric signals converted after the LEDs in the 1st row to the N/2th row emit light at the same time; receiving the first photoelectric conversion signal includes: After receiving the LEDs in the Nth row to the N/2+1th row in the second area to emit light incrementally row by row, the N/2 second photoelectric signals P _N ~ P _N/2+1 converted into N/2 second photoelectric signals; the second photoelectric signal P _N It includes the photoelectric signal converted after the LED in the Nth row emits light, the second photoelectric signal P _N-1 includes the photoelectric signal converted after the LEDs in the Nth row and the N-1th row emit light at the same time, and the second photoelectric signal P _N/2+1 includes The photoelectric signals converted after the LEDs in the Nth row to the N/2+1th row emit light simultaneously.

In an optional implementation manner, determining the brightness difference of the LED display unit 20 according to the coincidence degree of the first photoelectric signal and the second photoelectric signal includes: using N/2 first photoelectric signals P ₁ to P _N/2 to generate the first photoelectric signal A curve is generated by using N/2 second photoelectric signals P _N to P _N/2+1 ; the brightness difference of the LED display unit 20 is determined according to the coincidence of the first curve and the second curve.

The implementation process of the measurement method in the above-mentioned embodiment has been described in detail in the measurement device including the light collector 1010, and will not be repeated here.

The embodiments of the present application are described in detail above, and specific examples are used herein to illustrate the principles and implementations of the present application. The descriptions of the above embodiments can be used to help understand the methods and core ideas of the present application.

Claims

An LED display unit yin and yang color measuring device, characterized in that it comprises a first light collector and a second light collector;

The first light collector and the second light collector are respectively located on both sides of the light emitting surface of the LED display unit;

After the light emitted by the LED in the LED display unit is irradiated on the first light collector, a photoelectric effect occurs on the first light collector, and is converted into a first photoelectric signal; the LED in the LED display unit emits a photoelectric effect. After the light is irradiated on the second light collector, a photoelectric effect occurs on the second light collector, and is converted into a second photoelectric signal;

The brightness difference of the LED display unit can be determined according to the coincidence degree of the first photoelectric signal and the second photoelectric signal.
The LED display unit yin-yang color measuring device according to claim 1, wherein the center normal of the first light collector and the center normal of the second light collector are coincident, and the LED display unit The center normal of the light-emitting surface and the center normal of the first light collector perpendicularly intersect.
The device for measuring yin and yang colors of an LED display unit according to claim 2, wherein the LEDs in the LED display unit emit light at the same time.
The device for measuring the yin and yang colors of an LED display unit according to claim 3, wherein the determining the brightness difference of the LED display unit according to the coincidence degree of the first photoelectric signal and the second photoelectric signal comprises:

According to the difference between the ratio of the first photoelectric signal and the second photoelectric signal and the difference of 1, the brightness difference of the LED display unit is determined.
The LED display unit yin-yang color measuring device according to claim 2, wherein the LED display unit comprises N columns of LEDs, and N is a positive integer greater than or equal to 1;

After the LEDs in the first to Nth columns emit light column by column incrementally on the first light collector, they are converted into N first photoelectric signals P1 1 ˜P1 N ; the first photoelectric signal P1 1 includes the first column of LEDs emitting light The post-converted photoelectric signal, the first photoelectric signal P1 2 includes the photoelectric signal converted after the LEDs in the first and second columns emit light at the same time, and the first photoelectric signal P1 N includes the photoelectric signals converted after the LEDs in the first to Nth columns emit light at the same time. Signal;

After the LEDs in the first to Nth columns emit light column by column incrementally on the second light collector, they are converted into N second photoelectric signals P2 1 ˜P2 N ; the second photoelectric signal P2 1 includes the first column of LEDs emitting light The photoelectric signal after conversion, the second photoelectric signal P2 2 includes the photoelectric signal converted after the LEDs in the first column and the second column emit light simultaneously, and the second photoelectric signal P2N includes the photoelectric signal converted after the LEDs in the first column to the Nth column emit light at the same time. Signal;

After the LEDs in the Nth to 1st columns emit light column by column incrementally and are irradiated on the first light collector, they are converted into N first photoelectric signals P3 N to P3 1 ; the first photoelectric signal P3 N includes the Nth column LEDs emitting light The post-converted photoelectric signal, the first photoelectric signal P3 N-1 includes the photoelectric signal converted after the LEDs in the Nth and N-1th columns emit light at the same time, and the first photoelectric signal P3 1 includes the Nth to 1st columns. Post-converted photoelectric signal;

After the LEDs in the Nth to 1st columns emit light column by column incrementally and irradiate on the second light collector, they are converted into N second photoelectric signals P4 N to P4 1 ; the second photoelectric signal P4 N includes the Nth column of LEDs emitting light The post-converted photoelectric signal, the second photoelectric signal P4 N-1 includes the photoelectric signal converted after the LEDs in the Nth and N-1th columns emit light at the same time, and the second photoelectric signal P4 1 includes the Nth to 1st columns. Post-converted photoelectric signal.
The LED display unit yin-yang color measuring device according to claim 2, wherein the LED display unit comprises N rows of LEDs, and N is a positive integer greater than or equal to 1;

After the LEDs in the first row to the Nth row emit light incrementally row by row on the first light collector, they are converted into N first photoelectric signals P1 1 ˜P1 N ; the first photoelectric signal P1 1 includes the first row of LEDs emitting light. The post-converted photoelectric signal, the first photoelectric signal P1 2 includes the photoelectric signal converted after the LEDs in the first row and the second row emit light at the same time, and the first photoelectric signal P1 N includes the photoelectric signal converted after the LEDs in the first row to the Nth row emit light simultaneously. Signal;

After the LEDs in the first row to the Nth row emit light incrementally row by row on the second light collector, they are converted into N second photoelectric signals P2 1 ˜P2 N ; the second photoelectric signal P2 1 includes the LEDs in the first row emitting light. The photoelectric signal after conversion, the second photoelectric signal P2 2 includes the photoelectric signal converted after the LEDs in the first row and the second row emit light at the same time, and the second photoelectric signal P2N includes the photoelectric signal converted after the LEDs in the first row to the Nth row emit light at the same time. Signal;

After the LEDs in the Nth row to the 1st row emit light incrementally row by row on the first light collector, they are converted into N first photoelectric signals P3 N to P3 1 ; the first photoelectric signal P3 N includes the Nth row LEDs emitting light. The post-converted photoelectric signal, the first photoelectric signal P3 N-1 includes the photoelectric signal converted after the LEDs in the Nth row and the N-1th row emit light at the same time, and the first photoelectric signal P3 1 includes the Nth row to the 1st row. The LEDs emit light simultaneously Post-converted photoelectric signal;

After the LEDs in the Nth row to the 1st row emit light incrementally row by row on the second light collector, they are converted into N second photoelectric signals P4 N ˜P4 1 ; the second photoelectric signal P4 N includes the Nth row LEDs emitting light. The post-converted photoelectric signal, the second photoelectric signal P4 N-1 includes the photoelectric signal converted after the LEDs in the Nth row and the N-1th row emit light at the same time, and the second photoelectric signal P4 1 includes the Nth row to the 1st row The LEDs emit light simultaneously Post-converted photoelectric signal.
The LED display unit yin-yang color measuring device according to claim 5 or 6, wherein the brightness difference of the LED display unit can be determined according to the coincidence degree of the first photoelectric signal and the second photoelectric signal include:

The first curve is generated by using the N first photoelectric signals P1 1 ˜P1 N ; the second curve is generated by using the N second photoelectric signals P2 1 ˜P2 N ; the third curve is generated by using the N first photoelectric signals P3 N ˜P3 1 ; Using the N second photoelectric signals P4 N to P4 1 to generate a fourth curve;

According to the coincidence degree of the first curve and the fourth curve, and the coincidence degree of the second curve and the third curve, the brightness difference of the LED display unit is determined.
The yin-yang color measuring device for an LED display unit according to any one of claims 1 to 7, characterized in that, before the light emitted by the LED in the LED display unit is irradiated on the first light collector, the The LED display unit yin and yang color measuring device also includes:

A fixed substrate is arranged between the first light collector and the second light collector, and a calibration light source is arranged on the fixed substrate, so that:

The center normal of the calibration light source coincides with the center normal of the fixed substrate; a connecting line is formed between the center of the first light collector and the center of the second light collector, and the center of the calibration light source The normal line is perpendicular to the connecting line, and the center normal line of the calibration light source intersects with the midpoint of the connecting line.
An LED display unit yin and yang color measuring device, characterized in that it includes a light collector;

The light collector faces the light emitting surface of the LED display unit;

After the light emitted by the LEDs in the first area of the LED display unit is irradiated on the light collector, a photoelectric effect occurs on the light collector and is converted into a first photoelectric signal; the second photoelectric signal in the LED display unit After the light emitted by the LEDs in the area is irradiated on the light collector, a photoelectric effect occurs on the light collector and is converted into a second photoelectric signal; the LEDs in the first area and the LEDs in the second area Taking the projection of the light collector on the LED display unit as the center of symmetrical distribution;

The brightness difference of the LED display unit can be determined according to the coincidence degree of the first photoelectric signal and the second photoelectric signal.
The device for measuring male and female colors of an LED display unit according to claim 9, wherein the center normal of the light collector coincides with the center normal of the light emitting surface of the LED display unit.
The yin and yang color measuring device of an LED display unit according to claim 10, wherein the light emitting surface of the LED display unit is divided into the first area and the second area with the longitudinal center axis as the dividing line; or, The light-emitting surface of the LED display unit is divided into a first area and a second area with the horizontal central axis as the dividing line; the vertical central axis and the center normal of the light-emitting surface of the LED display unit intersect vertically, and the horizontal center The axis is perpendicular to the longitudinal central axis.
The yin-yang color measuring device of an LED display unit according to claim 11, wherein the LEDs in the first area emit light simultaneously, and the LEDs in the second area emit light simultaneously.
The device for measuring the yin and yang colors of an LED display unit according to claim 12, wherein the determining the brightness difference of the LED display unit according to the coincidence degree of the first photoelectric signal and the second photoelectric signal comprises:

According to the difference between the ratio of the first photoelectric signal and the second photoelectric signal and the difference of 1, the brightness difference of the LED display unit is determined.
The yin-yang color measuring device of an LED display unit according to claim 11, wherein, when the light-emitting surface of the LED display unit is divided into a first area and a second area with its longitudinal central axis as a dividing line:

The LED display unit includes N columns of LEDs; the first area includes LEDs from columns 1 to N/2, and the second area includes LEDs from columns N/2+1 to N; N is a positive integer greater than or equal to 1;

In the case where the light-emitting surface of the LED display unit is divided into a first area and a second area with the horizontal central axis as the dividing line: the LED display unit includes N rows of LEDs, and the first area includes the first row to the second area. N/2 rows of LEDs, the second area includes LEDs from the N/2+1th row to the Nth row; N is a positive integer greater than or equal to 1.
The yin-yang color measuring device of an LED display unit according to claim 14, wherein, in the case that the LED display unit comprises N columns of LEDs:

In the first area, the LEDs in the first to N/2 columns emit light incrementally column by column, and are converted into N/2 first photoelectric signals P 1 to P N/2 ; the first photoelectric signal P 1 includes the first column The photoelectric signal converted after the LED emits light, the first photoelectric signal P2 includes the photoelectric signal converted after the LEDs in the 1st and 2nd columns emit light at the same time, and the first photoelectric signal P N/2 includes the LEDs in the 1st to N/2th columns The photoelectric signal converted after emitting light at the same time;

In the second area, the LEDs in the Nth to N/2+1th columns emit light incrementally column by column, and are converted into N/2 second photoelectric signals P N to P N/2+1 ; the second photoelectric signals P N It includes the photoelectric signal converted after the LED in the Nth column emits light, the second photoelectric signal P N-1 includes the photoelectric signal converted after the LED in the Nth column and the N-1 column emit light at the same time, and the second photoelectric signal P N/2+1 includes The photoelectric signal converted after the LEDs in the Nth row to the N/2+1th row emit light at the same time;

In the case where the LED display unit includes N rows of LEDs:

In the first area, the LEDs from the 1st row to the N/2th row emit light incrementally row by row, and are converted into N/2 first photoelectric signals P 1 to P N/2 ; the first photoelectric signal P 1 includes the first row The photoelectric signal converted after the LED emits light, the first photoelectric signal P 2 includes the photoelectric signal converted after the LEDs in the first row and the second row emit light at the same time, and the first photoelectric signal P N/2 includes the first row to the N/2 row of LEDs The photoelectric signal converted after emitting light at the same time;

In the second area, the LEDs from the Nth row to the N/2+1th row emit light incrementally row by row, and are converted into N/2 second photoelectric signals P N ˜PN/2+1 ; the second photoelectric signals P N It includes the photoelectric signal converted after the LED in the Nth row emits light, the second photoelectric signal P N-1 includes the photoelectric signal converted after the LEDs in the Nth row and the N-1th row emit light at the same time, and the second photoelectric signal P N/2+1 includes The photoelectric signals converted after the LEDs in the Nth row to the N/2+1th row emit light simultaneously.
The device for measuring the yin and yang colors of an LED display unit according to claim 15, wherein the determining the brightness difference of the LED display unit according to the coincidence degree of the first photoelectric signal and the second photoelectric signal comprises:

generating a first curve by using N/2 first photoelectric signals P 1 -PN/2 , and generating a second curve by using N/2 second photoelectric signals P N -PN/2+1 ;

The brightness difference of the LED display unit is determined according to the degree of coincidence of the first curve and the second curve.
The LED display unit yin-yang color measuring device according to any one of claims 9 to 16, wherein the light collector is circular;

Before the light emitted by some LEDs in the LED display unit is irradiated on the light collector, the LED display unit negative and positive color measuring device further includes:

Calibrating the center of the light-emitting surface of the LED display unit, and displaying a circular light area with the center of the light-emitting surface of the LED display unit as the center of the circle on the LED display unit;

The center of the circular projection of the light collector on the light-emitting surface of the LED display unit is adjusted to coincide with the center of the circular light area.
A method for measuring the yin and yang colors of an LED display unit, comprising:

receiving a first photoelectric conversion signal;

receiving a second photoelectric conversion signal;

The brightness difference of the LED display unit is determined according to the coincidence degree of the first photoelectric signal and the second photoelectric signal.
The method for measuring yin and yang colors of an LED display unit according to claim 18, wherein the receiving the first photoelectric conversion signal and the receiving the second photoelectric conversion signal comprise:

receiving the first photoelectric conversion signal and the second photoelectric conversion signal respectively converted into after the LEDs in the LED display unit emit light at the same time;

The determining the brightness difference of the LED display unit according to the coincidence degree of the first photoelectric signal and the second photoelectric signal includes:

According to the difference between the ratio of the first photoelectric signal and the second photoelectric signal and the difference of 1, the brightness difference of the LED display unit is determined.
The method for measuring yin and yang colors of an LED display unit according to claim 18, wherein the LED display unit comprises N columns of LEDs, and N is a positive integer greater than or equal to 1;

The receiving the first photoelectric conversion signal includes: respectively receiving N first photoelectric signals P1 1 to P1 N converted into N first photoelectric signals P1 1 to P1 N and N first photoelectric signals converted into N first photoelectric signals after the LEDs in the 1st to Nth columns emit light incrementally column by column respectively. Signals P3 N ~ P3 1 ;

The first photoelectric signal P11 includes the photoelectric signal converted after the LEDs in the first column emit light, the first photoelectric signal P12 includes the photoelectric signal converted after the LEDs in the first column and the second column emit light at the same time, and the first photoelectric signal P1N includes The photoelectric signals converted after the LEDs in the 1st to Nth columns emit light at the same time; the first photoelectric signal P3 N includes the photoelectric signals converted after the LEDs in the Nth column emit light, and the first photoelectric signal P3 N-1 includes the Nth column and the Nth column. The photoelectric signals converted after the LEDs in one row emit light simultaneously, the first photoelectric signal P3 1 includes the photoelectric signals converted after the LEDs in the Nth row to the first row emit light simultaneously;

The receiving the second photoelectric conversion signal includes: respectively receiving N second photoelectric signals P2 1 to P2 N converted into N second photoelectric signals and N second photoelectric signals converted after the LEDs in the Nth to 1st columns emit light column by column. P4 N ~ P4 1 ;

The second photoelectric signal P21 includes the photoelectric signal converted after the LEDs in the first column emit light, the second photoelectric signal P22 includes the photoelectric signal converted after the LEDs in the first column and the second column emit light at the same time, and the second photoelectric signal P2N includes The photoelectric signals converted after the LEDs in the 1st to Nth columns emit light at the same time; the second photoelectric signal P4 N includes the photoelectric signals converted after the LEDs in the Nth column emit light, and the second photoelectric signal P4 N-1 includes the Nth column and the N-th photoelectric signal. The photoelectric signals converted after the LEDs in the first row emit light simultaneously, and the second photoelectric signal P4 1 includes the photoelectric signals converted after the LEDs in the Nth row to the first row emit light simultaneously.
The method for measuring the yin and yang colors of an LED display unit according to claim 18, wherein the LED display unit comprises N rows of LEDs, and N is a positive integer greater than or equal to 1;

The receiving the first photoelectric conversion signal includes: respectively receiving the N first photoelectric signals P1 1 to P1 N converted into N first photoelectric signals P1 1 to P1 N and the converted N first photoelectric signals after the LEDs in the first row to the Nth row emit light incrementally row by row respectively. Signals P3 N ~ P3 1 ;

Wherein, the first photoelectric signal P11 includes the photoelectric signal converted after the LEDs in the first row emit light, the first photoelectric signal P12 includes the photoelectric signal converted after the LEDs in the first row and the second row emit light at the same time, and the first photoelectric signal P1N includes The photoelectric signals converted after the LEDs in the first row to the Nth row emit light at the same time; the first photoelectric signal P3 N includes the photoelectric signals converted after the LEDs in the Nth row emit light, and the first photoelectric signal P3 N-1 includes the Nth row and the Nth row. The photoelectric signals converted after 1 row of LEDs emit light at the same time, the first photoelectric signal P3 1 includes the photoelectric signals converted after the LEDs in the Nth row to the 1st row emit light simultaneously;

The receiving the second photoelectric conversion signal includes: respectively receiving N second photoelectric signals P2 1 to P2 N converted into N second photoelectric signals and N second photoelectric signals converted after the LEDs in the Nth row to the first row emit light incrementally row by row. P4 N ~ P4 1 ;

Wherein, the second photoelectric signal P21 includes the photoelectric signal converted after the LEDs in the first row emit light, the second photoelectric signal P22 includes the photoelectric signal converted after the LEDs in the first row and the second row emit light at the same time, and the second photoelectric signal P2N includes The photoelectric signals converted after the LEDs in the first row to the Nth row emit light at the same time; the second photoelectric signal P4 N includes the photoelectric signals converted after the LEDs in the Nth row emit light, and the second photoelectric signal P4 N-1 includes the Nth row and the Nth row. The photoelectric signals converted after 1 row of LEDs emit light at the same time, and the second photoelectric signal P4 1 includes the photoelectric signals converted after the LEDs in the Nth row to the first row emit light simultaneously.
The method for measuring the yin and yang colors of an LED display unit according to claim 20 or 21, wherein the determining the brightness difference of the LED display unit according to the coincidence degree of the first photoelectric signal and the second photoelectric signal comprises the following steps: :

The first curve is generated by using the N first photoelectric signals P1 1 ˜P1 N ; the second curve is generated by using the N second photoelectric signals P2 1 ˜P2 N ; the third curve is generated by using the N first photoelectric signals P3 N ˜P3 1 ; Using the N second photoelectric signals P4 N to P4 1 to generate a fourth curve;

According to the coincidence degree of the first curve and the fourth curve, and the coincidence degree of the second curve and the third curve, the brightness difference of the LED display unit is determined.
The method for measuring the yin and yang colors of an LED display unit according to claim 18, wherein the light emitting surface of the LED display unit is divided into the first area and the second area with its longitudinal central axis as a dividing line; or, The light-emitting surface of the LED display unit is divided into a first area and a second area with the horizontal central axis as the dividing line; the vertical central axis and the center normal of the light-emitting surface of the LED display unit intersect vertically, and the horizontal center the axis is perpendicular to the longitudinal central axis;

The receiving the first photoelectric conversion signal and the receiving the second photoelectric conversion signal include: receiving the first photoelectric conversion signal converted after the LEDs in the first area emit light simultaneously; receiving the LEDs in the second area to emit light simultaneously the converted second photoelectric conversion signal;

The determining the brightness difference of the LED display unit according to the coincidence degree of the first photoelectric signal and the second photoelectric signal includes:

According to the difference between the ratio of the first photoelectric signal and the second photoelectric signal and the difference of 1, the brightness difference of the LED display unit is determined.
The method for measuring yin and yang colors of an LED display unit according to claim 18, wherein the light emitting surface of the LED display unit is divided into the first area and the second area with its longitudinal central axis as a dividing line;

In the case where the light-emitting surface of the LED display unit is divided into a first area and a second area with the longitudinal center axis as the dividing line: the LED display unit includes N rows of LEDs; the first area includes the first row to the second area. N/2 rows of LEDs, the second area includes N/2+1 row to Nth row LEDs; N is a positive integer greater than or equal to 1;

In the case where the LED display unit includes N columns of LEDs:

The receiving the first photoelectric conversion signal includes: receiving the LEDs in the first to N/2 columns to emit light column by column incrementally, and converting N/2 first photoelectric signals P 1 to N/2 into N/2 first photoelectric signals ; The first photoelectric signal P1 includes the photoelectric signal converted after the LED in the first column emits light, the first photoelectric signal P2 includes the photoelectric signal converted after the LED in the first column and the second column emit light at the same time, and the first photoelectric signal P N/ 2 Including the photoelectric signals converted after the LEDs in the 1st to N/2th columns emit light at the same time;

The receiving the second photoelectric conversion signal includes: receiving N/2 second photoelectric signals P N to P converted into N/2 second photoelectric signals after the LEDs in the Nth column to the N/2+1th column in the second area emit light incrementally column by column. N/2+1 ; the second photoelectric signal PN includes the photoelectric signal converted after the LEDs in the Nth column emit light, and the second photoelectric signal P N -1 includes the photoelectric signals converted after the LEDs in the Nth column and the N-1th column emit light at the same time , the second photoelectric signal P N/2+1 includes photoelectric signals converted after the LEDs in the Nth to N/2+1th columns emit light simultaneously.
The method for measuring yin and yang colors of an LED display unit according to claim 18, wherein the light emitting surface of the LED display unit is divided into a first area and a second area with its transverse central axis as a dividing line;

In the case where the light-emitting surface of the LED display unit is divided into a first area and a second area with the horizontal central axis as the dividing line: the LED display unit includes N rows of LEDs, and the first area includes the first row to the second area. N/2 rows of LEDs, the second area includes the N/2+1 row to the Nth row of LEDs; N is a positive integer greater than or equal to 1;

In the case where the LED display unit includes N rows of LEDs:

The receiving the first photoelectric conversion signal includes: receiving N/2 first photoelectric signals P 1 to P N / converted into N/2 first photoelectric signals P 1 to N/2 after the LEDs in the first row to the N/2 row in the first area emit light incrementally row by row. 2 ; the first photoelectric signal P1 includes the photoelectric signal converted after the LEDs in the first row emit light, the first photoelectric signal P2 includes the photoelectric signals converted after the LEDs in the first row and the second row emit light at the same time, and the first photoelectric signal P N/ 2 Including the photoelectric signals converted after the LEDs in the first row to the N/2 row emit light at the same time;

The receiving the first photoelectric conversion signal includes: receiving N/2 second photoelectric signals P N to P converted into after the LEDs in the Nth row to the N/2+1th row in the second area emit light incrementally row by row N/2+1 ; the second photoelectric signal PN includes the photoelectric signal converted after the LEDs in the Nth row emit light, and the second photoelectric signal P N -1 includes the photoelectric signals converted after the LEDs in the Nth row and the N-1th row emit light at the same time , the second photoelectric signal P N/2+1 includes the photoelectric signals converted after the LEDs in the Nth row to the N/2+1th row emit light simultaneously.
The method for measuring the yin and yang colors of an LED display unit according to claim 24 or 25, wherein the determining the brightness difference of the LED display unit according to the degree of coincidence of the first photoelectric signal and the second photoelectric signal comprises: :

generating a first curve by using N/2 first photoelectric signals P 1 -PN/2 , and generating a second curve by using N/2 second photoelectric signals P N -PN/2+1 ;

The brightness difference of the LED display unit is determined according to the degree of coincidence of the first curve and the second curve.