OLED Gate Driver Circuit Without Overdrive Supply Voltages
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Solution Overview
Problem
Designing a satisfactory OLED display for electronic devices is challenging due to inefficiencies in power supply management and transistor leakage, leading to issues like flicker and luminance non-uniformity.
Innovation Solution
Implementing a complementary emission driving scheme using p-type silicon and n-type semiconducting oxide transistors, powered by pixel supply voltages, and omitting overdrive supply voltages to reduce power consumption and transistor leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OLED display circuitry uses overdrive supply voltages for gate driver circuits, then display performance and control precision are improved, but power consumption increases and device complexity increases
Solution Approach 1:
The patent changes the voltage parameter range used for gate driver circuits by eliminating the need for overdrive supply voltages. Instead of using voltages beyond the standard pixel supply range, the invention operates gate drivers within the existing pixel supply voltage range, thereby reducing power consumption while maintaining display performance through alternative control mechanisms.
Solution Approach 2:
The patent makes the pixel supply voltage system multi-functional by having it serve both the pixel circuits and the gate driver circuits. The same supply voltage that powers the display pixels is also used to power the gate driver circuits, eliminating the need for separate overdrive supply voltages and reducing overall power consumption.
2Measurement precision
If conventional OLED display circuitry uses separate overdrive supply voltages for gate drivers, then control precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the overdrive supply voltage generation circuitry from the display system. By taking out the need for separate high-voltage generation circuits and using only the standard pixel supply voltages, the invention simplifies the overall device architecture while maintaining sufficient control precision through alternative gate driver control methods.
Solution Approach 2:
The patent implements multi-functionality where the pixel supply voltage system serves dual purposes: powering both the pixel circuits and the gate driver circuits. This eliminates the need for separate overdrive supply circuits, reducing device complexity while maintaining control precision through unified voltage management.
3Device complexity
If conventional OLED displays use standard pixel supply voltages for both pixels and gate drivers, then device complexity is reduced, but transistor leakage increases
Solution Approach 1:
The patent applies local quality by using different transistor types in different locations within the pixel circuit. Specifically, it employs p-type silicon transistors for certain functions and n-type semiconducting oxide transistors for other functions, allowing each transistor type to be optimized for its specific role and reducing overall leakage by matching transistor characteristics to their operational requirements.
Solution Approach 2:
The patent uses a composite approach by combining different transistor technologies (p-type silicon and n-type semiconducting oxide) within the same pixel circuit. This composite transistor architecture allows the system to benefit from the low leakage characteristics of both transistor types while maintaining compatibility with the unified power supply structure.
Data Source
AI summary
A display may include an array of pixels. Each pixel in the array may include a light-emitting diode having an anode terminal coupled to a first power supply terminal configured to receive a positive power supply voltage and having a cathode terminal coupled to a second power supply terminal configured to receive a ground power supply voltage. The display can further include a gate driver circuit configured to output a control signal to a row of display pixels in the array. The control signal can be driven between the positive power supply voltage and a low voltage different than the ground power supply voltage.