Integrated Gate and Emission Driving Circuit for Display Panels
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Solution Overview
Problem
Conventional flat panel display driving circuits face issues with mismatched impedance in gate control signals, leading to poor luminous uniformity and display deterioration due to manufacturing errors affecting shift registers, which are complex and require numerous transistors.
Innovation Solution
The implementation of a display panel with a first and second gate line driving circuit, where the first gate line driving circuit generates control signals for reading data and compensating threshold voltage, and the second gate line driving circuit generates light emitting control signals, with both circuits having distinct impedance loads to improve signal generation and reduce transistor count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional driving circuits use separate gate control signal generation units and light emitting control signal generation units disposed on different sides of the display area, then the control signals can be provided to pixel circuits, but the circuit design becomes complicated and requires numerous transistors
Solution Approach 1:
The patent combines the gate control signal generation unit and light emitting control signal generation unit into a single integrated driving circuit disposed on one side of the display area. This merging eliminates the need for separate circuits on both sides, reducing overall circuit complexity and transistor count while maintaining the functional separation of gate control and light emitting control signals through internal circuit design
2Adaptability or versatility
If multiple separate control signal generation units are used to control pixel circuits, then specific control functions can be achieved, but the number of transistors increases and manufacturing errors have greater impact
Solution Approach 1:
The integrated driving circuit employs multi-functional transistor designs that can serve multiple control functions. By designing transistors with universal capabilities to handle both gate control and light emitting control operations, the circuit reduces the total transistor count while maintaining the adaptability and versatility needed for various control signal generation requirements
3Measurement precision
If gate control signals and light emitting control signals are generated by separate circuits, then signal control is precise, but the impedance mismatch causes poor luminous uniformity
Solution Approach 1:
The integrated driving circuit implements local impedance matching by designing different impedance characteristics for different signal output paths within the same circuit. The gate control signal path and light emitting control signal path have optimized local impedance values matched to their respective load requirements, ensuring both precise signal control and uniform luminous output without the mismatches that occur in separate circuits
Data Source
AI summary
A display panel includes a display area first and second gate line driving circuits. The display area includes a plurality of pixels is configured to determine how to process a data transmitted on a data line according to first and second control signals transmitted on first and second gate lines respectively and a second control signal transmitted on a second gate line and determine when to emit light according to a light emitting control signal transmitted on a light emitting control line. The first gate line driving circuit is coupled to the first gate line and for providing the first control signal thereto. The second gate line driving circuit is coupled to the second gate line and the light emitting control line and configured to provide the second control signal and the light emitting control signal thereto, respectively.