Integrated GOA Circuit for OLED Narrow Border Displays
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Solution Overview
Problem
The existing OLED display devices face challenges in maintaining display quality due to aging and threshold voltage drift of driving TFTs, requiring complex circuits with multiple thin film transistors and capacitors, which are not conducive to narrow border designs and increase production costs.
Innovation Solution
A Gate Driver on Array (GOA) circuit with cascaded units, each comprising a scan signal output module and an emitting signal output module, using a specific configuration of thin film transistors and capacitors to simplify the circuit structure and reduce the number of components, allowing for the integration of scan and emitting signals, thereby facilitating narrow border designs and cost reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate EM GOA circuit and SCAN GOA circuit are disposed to generate EM signal and SCAN signal respectively, then the display quality can be maintained through proper signal control, but the circuit becomes complex with large number of thin film transistors and capacitors
Solution Approach 1:
The patent merges the EM GOA circuit and SCAN GOA circuit into a single integrated GOA circuit. The circuit uses a shared transistor array where transistors serve dual purposes: driving emission signals during emission periods and scanning signals during scanning periods. This consolidation eliminates the need for separate circuit blocks, reducing the total number of thin film transistors and capacitors while maintaining the ability to generate both EM and SCAN signals with proper timing control.
2Ease of operation
If separate EM GOA circuit and SCAN GOA circuit are disposed, then signal control is achieved, but the number of components increases which is not conducive to narrow border designs
Solution Approach 1:
The patent integrates both EM and SCAN signal generation functions into a single GOA circuit block, significantly reducing the circuit area occupied in the display device. The shared transistor array and multiplexed signal paths eliminate redundant components, allowing the circuit to be compacted into a smaller footprint that accommodates narrow border designs while preserving full signal control capability through temporal multiplexing.
Solution Approach 2:
The GOA circuit is designed with universal transistors that perform multiple functions at different times. The same transistor array generates both emission signals and scan signals by controlling the timing and sequence of operations. This multi-functionality allows a single circuit block to replace what would traditionally require separate dedicated circuits, reducing overall area while maintaining operational control.
3Reliability
If more control signals such as EM signal are needed in addition to SCAN signal, then the OLED device driving circuit can control display quality, but the circuit complexity increases
Solution Approach 1:
The patent implements a universal GOA circuit where the same transistor array and signal paths are used to generate both SCAN signals and EM signals. The circuit employs temporal multiplexing where transistors are allocated to different signal generation tasks at different time periods. This approach allows comprehensive display quality control through multiple control signals while avoiding the complexity of separate dedicated circuits for each signal type.
Data Source
AI summary
The invention provides a GOA circuit and OLED display device. The GOA circuit comprises a plurality of cascaded GOA units, with each GOA unit comprising: a scan signal output module and an emitting signal output module electrically connected to the scan signal output module; during a frame period, the scan signal output module is capable of outputting a scanning signal including at least two low potential pulses within a frame time, and the light emitting signal output module can output a valid emitting signal according to the scan signal outputted by the scan signal output module. Thus, the GOA circuit for scan signal and the GOA circuit for emitting signal in the conventional design are integrated into a GOA circuit, which can reduce the number of TFTs and capacitors, simplify the circuit structure, and facilitate narrow-border display.