Display Panel Vth Correction and Signal Writing Timing
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Solution Overview
Problem
Current display devices using organic EL elements face challenges in maintaining uniform light emitting luminance due to time-dependent changes in I-V characteristics, threshold voltage, and mobility of driving transistors, leading to luminance unevenness and chromaticity shifts during high-speed driving.
Innovation Solution
A display panel design with a plurality of scanning lines and power lines configured to connect subpixels of the same luminescent color, allowing for simultaneous Vth correction and signal writing within the same period, prioritizing signal writing to subpixels with minimal chromaticity shifts, and optimizing signal line connections to reduce timing margins and enhance high-speed driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the 1H period is shortened to enable high-speed driving, then the scanning speed is improved, but the timing margin for signal writing becomes inadequate causing luminance unevenness and chromaticity shifts
Solution Approach 1:
The patent performs Vth correction in advance before signal writing within the same 1H period. By preparing the transistor threshold voltage correction beforehand, the system ensures that signal writing can be accurately performed even with reduced timing margins in high-speed driving modes.
Solution Approach 2:
The patent merges Vth correction and signal writing operations into the same 1H period, allowing both operations to be completed within a single horizontal scanning period. This integration enables high-speed driving while maintaining adequate timing for both correction and signal writing operations.
2Reliability
If Vth correction and signal writing are performed every 1H period, then the uniformity of light emitting luminance is improved, but the scanning period cannot be shortened limiting high-speed driving
Solution Approach 1:
The patent combines Vth correction and signal writing into the same 1H period, allowing both operations to be completed within a single horizontal scanning period. This integration enables high-speed driving while maintaining adequate timing for both correction and signal writing operations.
Solution Approach 2:
The patent performs Vth correction in advance before signal writing within the same 1H period. By preparing the transistor threshold voltage correction beforehand, the system ensures that signal writing can be accurately performed even with reduced timing margins in high-speed driving modes.
3Loss of time
If the timing margin is reduced for high-speed driving, then the scanning period is shortened, but luminance unevenness and chromaticity shifts occur due to inadequate signal writing
Solution Approach 1:
The patent performs Vth correction in advance before signal writing within the same 1H period. By preparing the transistor threshold voltage correction beforehand, the system ensures that signal writing can be accurately performed even with reduced timing margins in high-speed driving modes.
Solution Approach 2:
The patent merges Vth correction and signal writing operations into the same 1H period, allowing both operations to be completed within a single horizontal scanning period. This integration enables high-speed driving while maintaining adequate timing for both correction and signal writing operations.
Data Source
AI summary
A display device includes pixel circuits disposed in rows and columns. A first pixel circuit is configured to emit light of a first color, and a second pixel circuit is configured to emit light of a second color, with the first color preferably being green. A given signal line provides a first image data signal and a second image data signal respectively to the first pixel circuit and the second pixel circuit within a horizontal scanning period, with the first pixel circuit receiving the first image data signal before the second pixel circuit receives the second image data signal.