OLED Signal Modification for Transistor Deviation Compensation
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Solution Overview
Problem
Organic light emitting devices face display quality degradation due to spatial and temporal characteristic deviations in driving transistors and organic light emitting elements, which existing compensation methods complicate pixel circuits, increase costs, and reduce yield.
Innovation Solution
An organic light emitting device system that includes a signal modification unit to adjust image signals based on characteristic deviations of both driving transistors and organic light emitting elements, using measurement data and lookup tables to generate modification information, thereby reducing characteristic deviations without the need for a compensation circuit per pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compensation circuit is formed in each pixel to reduce characteristic deviations, then display quality improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the compensation function from individual pixel circuits and relocates it to a separate compensation circuit located outside the pixel array. This separation removes the complexity and additional wiring from within each pixel while maintaining the compensation capability, thus improving display quality without increasing pixel circuit complexity
Solution Approach 2:
The separate compensation circuit serves multiple pixels simultaneously, providing a universal compensation solution that reduces characteristic deviations across the display without requiring dedicated compensation circuits for each pixel. This multi-functional approach maintains display quality while reducing overall device complexity
2Reliability
If a compensation circuit is formed in each pixel to reduce characteristic deviations, then display quality improves, but manufacturing cost increases
Solution Approach 1:
By extracting the compensation function from individual pixels and placing it in a separate circuit, the invention reduces the number of additional elements and wiring required within each pixel. This simplification directly reduces manufacturing complexity and associated costs while maintaining the ability to compensate for characteristic deviations
Solution Approach 2:
The compensation circuit is integrated as a separate module that can be implemented using existing transistor structures and wiring patterns, merging the compensation function with the existing display architecture rather than adding completely separate components. This approach reduces manufacturing cost by utilizing existing fabrication processes
3Reliability
If a compensation circuit is formed in each pixel to reduce characteristic deviations, then display quality improves, but manufacturing yield decreases
Solution Approach 1:
Removing the compensation circuit from individual pixels reduces the total number of elements and interconnections that must be successfully formed during manufacturing. Fewer elements mean fewer potential failure points, thereby improving manufacturing yield while still achieving display quality improvement through the separate compensation circuit
Data Source
AI summary
An organic light emitting device including a display panel including a plurality of pixels respectively including a driving transistor and an organic light emitting element; a driving unit to supply a driving signal to the display panel; a signal controller to control the driving unit; a signal modification unit to modify an input image signal based on modification information to generate a modified image signal; and a modification controller to generate and provide the modification information to the signal modification unit. The signal modification unit includes a first modification unit to convert the input image signal into a first modified signal according to first modification information generated based on a characteristic deviation of the driving transistor, and a second modification unit to convert the first modified signal into a second modified signal according to second modification information generated based on a characteristic deviation of the organic light emitting element.