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Method and device for improving luminance uniformity of passive matrix organic light-emitting diode display screen

A technology of light-emitting diodes and brightness uniformity, which is applied to passive organic light-emitting diode (PMOLED) displays, improves the brightness uniformity of passive organic light-emitting diode displays, and can solve the problems of changing brightness uniformity and uneven brightness of display images. , to achieve the effect of improving brightness uniformity and improving brightness unevenness

Inactive Publication Date: 2014-07-23
NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of non-uniform brightness of the display screen in the case of low brightness existing in the existing organic light-emitting diode display screen, to invent a method for changing its brightness uniformity, and to provide a matching electrical control device at the same time

Method used

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  • Method and device for improving luminance uniformity of passive matrix organic light-emitting diode display screen
  • Method and device for improving luminance uniformity of passive matrix organic light-emitting diode display screen

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Embodiment 1

[0029] Such as figure 1 , 3 shown.

[0030] An electrical control device for improving the brightness uniformity of a passive organic light-emitting diode display, which is mainly composed of an image input interface circuit 1, a main controller 2, a frame memory 3, a digital adjustable power supply circuit 5, and a PMOLED driver circuit 6. The image input end of the main controller 2 is connected with the output end of the image input interface circuit 1, the frame memory 3 is bidirectionally connected with the main controller 2, and the input end of the digital adjustable power supply circuit 4 is connected with the output end of the main controller 2 , the digital adjustable power supply circuit 4 is connected with the power input end of the PMOLED driver circuit 5 to provide the required driving power for the PMOLED screen, and the output end of the main controller is connected with the input end of the PMOLED driver circuit 6, as figure 1 shown. The specific circuit bl...

Embodiment 2

[0032] Such as figure 2 shown.

[0033] A method for improving the brightness uniformity of a passive organic light-emitting diode display screen, specifically comprising the following steps:

[0034] Step (1), the main controller receives the image data input by the image input interface circuit, stores the image data in the frame memory, and counts the number of luminous pixels in each row and the gray level of each luminous pixel in the row;

[0035] Step (2), the main controller calculates the load of each row according to the number of luminous pixels in each row and the gray level of each luminous pixel in the row;

[0036] Step (3), the main controller calculates the brightness correction coefficient βx of each row according to the load of each row and the load of the reference row, x=1, 2, 3...n..., x is the row number, and the load of the reference row can be the row with the largest load Load, minimum row load or intermediate value row load, the brightness correct...

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Abstract

The invention provides a method and device for improving luminance uniformity of a passive matrix organic light-emitting diode display screen. The device comprises an image input interface circuit, a communication interface circuit, a main controller, a frame memorizer, a digital adjustable power supply circuit and a PMOLED driver circuit. The image input interface circuit receives image data which need to the displayed and transmits the image data to the main controller. The main controller receives the image data and stores the image data in the frame memorizer, and the luminance correction coefficient of each line is calculated according to the display load of each line. The main controller controls the PMOLED driver circuit to drive the PMOLED display screen to display an image, and the driving power supply voltage output by the digital adjustable power supply circuit when pixels of each line are displayed or the pixel light emitting duty ratio is adjusted according to the luminance correction coefficient of the line. According to the method and the device, the phenomenon that luminance between the lines is not uniform due to the fact that loads of all the lines are different can be effectively eliminated for the PMOLED display screen, and especially the phenomenon that luminance is not uniform when luminance is low can be effectively eliminated.

Description

technical field [0001] The invention relates to a diode display technology, especially a passive organic light emitting diode (PMOLED) display technology, specifically a method for improving the brightness uniformity of a passive organic light emitting diode display screen and a supporting electrical control device. Background technique [0002] Compared with liquid crystal display, organic light emitting diode display (OLED, Organic light emitting display) technology has advantages such as wide viewing angle, high contrast ratio, and fast response. It can be divided into passive drive (Passive Matrix, PMOLED) and active drive (Active Matrix, AMOLED) in terms of driving methods. Among them, PMOLED uses a scanning method to light up the pixels in the screen array, and each pixel emits light under short pulse drive, which has the advantages of simple structure and easy production, and has been applied earlier than AMOLED. [0003] However, in practical applications, especial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G5/10G09G3/32G09G3/3216
Inventor 章鹏王光腾曹允王绪丰樊卫华陈建军洪乙又刘忠安吴金华
Owner NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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