Passive matrix organic light emitting diode display with balanced display brightness function and driving method

Abstract

The present invention is related to a PMOLED display with uniform brightness controller, which comprises a displaying unit matrix and a controller. The controller is electronically connected respectively to multiple COM electrodes and multiple SEG electrodes of the displaying unit matrix. The controller defines a driving duty of a scanning signal and a data signal according to number of OLED devices which are about to be driven corresponding to one COM electrode. The driven OLED devices corresponded to the same COM electrodes are driven for a longer duty when there are more OLED devices about to be driven. Thus, a uniform brightness of the display is achieved by aforementioned display time compensation method performed by the controller.

Description

technical field [0001] A passive matrix organic light emitting diode display, in particular a passive matrix organic light emitting diode display with a function of equalizing display brightness. Background technique [0002] Compared with traditional flat-panel displays, organic light-emitting diode displays have many advantages such as wide viewing angle, fast response time, high brightness, low operating voltage, self-illumination, etc., and have become an indispensable and important display technology for the development of current and future displays. Organic light emitting diodes can be divided into active matrix (AM) and passive matrix (PM) according to different driving methods. Among them, passive driving organic light emitting diode displays have many advantages such as low manufacturing cost and high yield rate. Therefore, it is generally used in consumer or industrial electronic products. [0003] Please refer to Figure 7 , an existing passively driven organic ...

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Problems solved by technology

[0005] In order to solve the problem that in the existing passively driven organic light emitting diode display, when the number of light outputs generated by the display unit corresponding to each scanning electrode is relatively large at the same time, the brightness is easily reduced and the brightness of the display screen is uneven, the present invention proposes a According to the number of each display unit corresponding to each scanning electrode that is in the light output state at the same time, the driving time length of the scanning electrode and the data electrode or the voltage difference between the scanning electrode and the data electrode can be adjusted, so that the light output corresponding to the same scanning line can be adjusted. Each display unit with a relatively large number has a relatively long display time or required voltage difference, so as to make up for the problem of uneven brightness and achieve the technical effect of balanced brightness display

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