Signal Line Driver Intermittent Charge Voltage Control
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Solution Overview
Problem
Existing active matrix display devices face issues with longitudinal cross talk due to leakage currents from transistors, leading to reduced image quality and increased power consumption, despite attempts to mitigate these issues through precharging signal lines.
Innovation Solution
A display device and method that includes a pixel array with scanning and signal lines, where a scanning line driver supplies scanning pulses and a signal line driver intermittently outputs a charge voltage with a lower potential than the pixel signal voltage for one frame period, preventing the channel potential of the pixel transistor from exceeding the pixel signal voltage and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If signal lines are precharged at a predetermined level to improve longitudinal cross talk, then image quality is improved, but power consumption increases
Solution Approach 1:
The signal lines are not continuously precharged but are instead periodically recharged at specific intervals during the frame period. The recharge operation is performed intermittently based on the relationship between the pixel signal voltage and the channel potential, rather than continuously maintaining a predetermined charge level. This periodic action reduces power consumption while still preventing longitudinal cross talk when necessary.
Solution Approach 2:
The invention changes the voltage parameter dynamically by comparing the pixel signal voltage with the channel potential. When the pixel signal voltage becomes lower than the channel potential, a recharge operation is triggered. This parameter-based control mechanism allows the system to adapt the precharge operation to actual operating conditions, avoiding unnecessary power consumption while maintaining image quality.
2Reliability
If continuous precharge is applied to signal lines to prevent channel potential from exceeding pixel signal voltage, then longitudinal cross talk is reduced, but power consumption increases
Solution Approach 1:
The invention implements a feedback mechanism where the control unit monitors the relationship between the pixel signal voltage and the channel potential. Based on this feedback information, the control unit determines whether a recharge operation is necessary. This feedback-based control ensures that precharge operations are performed only when needed to prevent longitudinal cross talk, rather than continuously, thereby reducing power consumption while maintaining reliability.
3Stability of the object's composition
If signal lines are precharged to maintain stable pixel transistor operation, then display quality is improved, but energy loss increases
Solution Approach 1:
The invention performs preliminary recharge actions on signal lines based on predicted conditions. The control unit determines in advance when the pixel signal voltage may become lower than the channel potential and triggers recharge operations proactively. This preliminary action prevents instability in pixel transistor operation before it occurs, rather than continuously maintaining charge levels, thereby reducing energy loss while ensuring stability.
Data Source
AI summary
A display device includes: a pixel array portion in which plural pixels in which display gradations are controlled based on written pixel signals are disposed in row and column directions; plural scanning lines disposed in the pixel array portion and supplying scanning pulses for the pixels in the rows; plural signal lines disposed in the pixel array portion and supplying the pixel signals for the pixels in the columns; a scanning line driver successively supplying the scanning pulses to the plural scanning lines and causing the pixels in the rows to carry out write of the pixel signals; and a signal line driver outputting the pixel signals for the pixels to the plural signal lines, and intermittently outputting a charge voltage with lower electric potential than a predetermined pixel signal voltage once or more for one frame period of time to each of the plural signal lines.