Display Panel Gate Line Driving Circuit Segmentation
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Solution Overview
Problem
Conventional driving circuits for flat panel displays face issues with mismatch impedance of gate control signals, leading to poor luminous uniformity and potential display deterioration due to manufacturing errors affecting shift registers and transistor drifts.
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 the first control signal and the second gate line driving circuit generates the second control signal and light emitting control signal, separated to manage impedance differences and reduce the number of required transistors, thereby stabilizing the operation and improving manufacturing tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single driving circuit is used to control all gate lines, then the device complexity is reduced, but the luminous uniformity deteriorates due to impedance mismatch of control signals
Solution Approach 1:
The driving circuit is divided into a first driving circuit and a second driving circuit. The first driving circuit controls the first gate line, while the second driving circuit controls the second gate line. This segmentation allows independent optimization of control signals for each gate line, resolving the impedance mismatch issue that would otherwise degrade luminous uniformity.
2Reliability
If more transistors are used to improve manufacturing tolerance, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The pixel circuit is divided into a first pixel circuit and a second pixel circuit, each with dedicated transistors for specific functions. The first pixel circuit includes transistors for data signal processing, while the second pixel circuit includes transistors for light emitting control. This segmentation reduces the total transistor count compared to using redundant transistors in a single circuit, while maintaining manufacturing tolerance through specialized design.
Solution Approach 2:
The first transistor in each pixel circuit serves multiple functions: it acts as a switch for the data signal during the writing phase and as a storage element during the display phase. This multi-functionality reduces the need for additional dedicated transistors, maintaining reliability without increasing device complexity.
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.