Pixel Drive Circuit for OLED Brightness Uniformity
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Solution Overview
Problem
The existing method of connecting two OLEDs in parallel to delay aging results in brightness differences due to variations in insulation properties and impedance, affecting the uniformity of the display screen.
Innovation Solution
A pixel drive circuit and method that includes a first and second data input circuit, a current regulation circuit, energy storage circuits, and light-emitting control circuits for each OLED, allowing for simultaneous light emission and adjustment of driving currents to equalize brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If two OLEDs are connected in parallel to delay aging, then the service life of OLEDs is extended, but brightness differences occur due to variations in insulation properties and impedance
Solution Approach 1:
The patent introduces separate control circuits for each OLED device, allowing independent adjustment of driving currents. The current regulation circuit applies different compensation values to each OLED based on its specific characteristics (insulation properties and impedance), thereby achieving uniform brightness while maintaining the parallel connection structure for extended service life.
2Duration of action of stationary object
If driving current of OLEDs is reduced to delay aging, then the service life is extended, but the luminance of OLEDs is affected
Solution Approach 1:
The patent dynamically adjusts the driving current parameters for each OLED through separate control circuits. By modifying the compensation values and control voltages independently for each device, the system maintains optimal luminance output while operating at reduced current levels that extend service life, thus resolving the contradiction between longevity and brightness performance.
Data Source
AI summary
A pixel drive circuit which includes a first data input circuit, a second data input circuit, a current regulation circuit, a first energy storage circuit, a second energy storage circuit, a first light-emitting control circuit and a second light-emitting control circuit. The first and second data input circuits are in electrical connection with control ends of the first and second light-emitting control circuits, respectively. Inputs of the first and second light-emitting control circuits are both in electrical connection with a first power supply. Outputs of the first and second light-emitting control circuit are in electrical connection with anodes of a first light-emitting device and a second light-emitting device, respectively. The first light-emitting device and the second light-emitting device emit light simultaneously. The current regulation circuit is in electrical connection with an output of the second data input circuit.