Pixel Driving Circuit Time-Division Control for Organic EL Panels
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Solution Overview
Problem
Conventional organic electroluminescent (EL) display devices have a complex circuit structure with many wirings and elements per pixel, limiting the opening ratio and yield, and making it difficult to arrange multiple elements on a single pixel as the display becomes more precise.
Innovation Solution
A pixel driving circuit that commonly connects switching and driving transistors to EL devices, reducing the number of elements and wirings by sequentially driving red, green, and blue light emitting elements time-divisionally to improve the opening ratio and efficiency of the organic EL panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel driving circuit is used with separate switching and driving transistors for each EL device, then each pixel can be individually driven, but the number of wirings and elements increases, reducing the opening ratio
Solution Approach 1:
The patent merges the switching transistor and driving transistor into a single integrated pixel driving circuit. The switching transistor receives scan signals and data signals, while the driving transistor uses these signals to control the EL device, eliminating the need for separate switching circuits for each pixel and reducing overall circuit complexity
Solution Approach 2:
The pixel driving circuit is designed with multi-functional transistors that perform both switching and driving operations. The switching transistor serves dual purposes by receiving both scan and data signals, and the driving transistor handles both signal transmission and EL device control, reducing the total number of components required
2Manufacturing precision
If multiple elements are arranged on each pixel to improve display precision, then display quality increases, but the opening ratio decreases due to more wirings and elements
Solution Approach 1:
The patent combines multiple functions into fewer elements by integrating the switching and driving transistors within each pixel. This reduction in element count increases the light-emitting area while maintaining the precision needed for high-quality display output
3Area of moving object
If the number of elements in the pixel circuit is reduced to improve opening ratio, then more panel space is available, but the circuit structure becomes simpler
Solution Approach 1:
The patent merges the switching transistor and driving transistor into a single integrated pixel driving circuit. The switching transistor receives scan signals and data signals, while the driving transistor uses these signals to control the EL device, eliminating the need for separate switching circuits for each pixel and reducing overall circuit complexity
Solution Approach 2:
The pixel driving circuit is designed with multi-functional transistors that perform both switching and driving operations. The switching transistor serves dual purposes by receiving both scan and data signals, and the driving transistor handles both signal transmission and EL device control, reducing the total number of components required
Data Source
AI summary
A pixel driving circuit for a display device in which a plurality of gate lines and data lines are arranged. The pixel circuit is disposed at an intersection between the gate lines and data lines, and includes at least two light emitting elements for emitting certain colors within a certain section; an active device commonly connected to the at least two light emitting elements to drive the at least two light emitting elements; and an power source control part connected to the active device to transmit driving control signals for the at least two light emitting elements to the active device. The active device sequentially drives the at least two light emitting elements in the certain section per a certain period of time in response to the power source signals transmitted through the power source control part, and the at least two light emitting elements are sequentially emitted.