Scanning Drive Circuit Pulse Width Adjustment
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Solution Overview
Problem
Existing scanning drive circuits for display devices face challenges in efficiently adjusting the ratio between display and non-display time periods, leading to complications in layout area occupation and circuit cost, particularly in maintaining uniform luminance due to threshold voltage dispersion in transistors.
Innovation Solution
A scanning drive circuit with a shift register portion and logical circuit portion that successively shifts start pulses to output signals, allowing for easy adjustment of pulse widths on display control lines without affecting scanning and initialization control lines, integrated to reduce layout area and circuit cost while maintaining uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ratio between display time period and non-display time period is adjusted in existing scanning drive circuits, then moving image characteristics can be improved, but layout area occupation increases and circuit cost increases
Solution Approach 1:
The patent merges the display control function with the scanning drive circuit by integrating a display control transistor and display control line into the existing circuit architecture. This allows pulse width adjustment for moving image characteristics without requiring separate control circuits, thereby improving productivity while avoiding increased layout area.
Solution Approach 2:
The scanning drive circuit is designed to perform multiple functions: it simultaneously controls scanning operations and display timing through shared transistors and control lines. The display control transistor can operate in different modes to adjust pulse widths, enabling the circuit to adapt to different display requirements without adding dedicated components that would increase layout area.
2Productivity
If the ratio between display time period and non-display time period is adjusted in existing scanning drive circuits, then moving image characteristics can be improved, but circuit cost increases
Solution Approach 1:
The display control functionality is merged into the existing scanning drive circuit using shared transistors and control lines. This integration eliminates the need for additional dedicated components, thereby improving moving image characteristics while avoiding increased circuit cost.
Solution Approach 2:
The circuit uses its own existing transistors and control lines to perform display control functions. The scanning drive circuit self-adjusts pulse widths by utilizing its internal components in different operational modes, eliminating the need for external control circuits and reducing overall circuit cost.
3Manufacturing precision
If threshold voltage dispersion in transistors is addressed to maintain uniform luminance, then luminance uniformity improves, but device complexity increases
Solution Approach 1:
The patent compensates for threshold voltage dispersion by dynamically adjusting the drive voltage applied to the light emitting portion. By changing the voltage parameter in response to detected luminance variations, the circuit maintains uniform luminance across different pixels without requiring complex additional circuitry for each pixel.
Solution Approach 2:
The circuit incorporates feedback mechanisms where the drive voltage is adjusted based on the actual luminance output. This feedback loop compensates for threshold voltage variations in different transistors, maintaining uniform luminance while using a relatively simple circuit configuration that leverages the existing transistor and capacitor structure.
Data Source
AI summary
A display device including a display area including a plurality of pixel circuits, a peripheral area including a scanning circuit, a plurality of first scanning lines, a plurality of second scanning lines, a plurality of third scanning lines, and a scanning circuit. The scanning circuit facing to a first side of the display area and configured to drive the pixel circuits via the first, the second and the third scanning lines.