Display Panel Pixel Circuit With Back-Gate Low-Gray-Scale Control
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Solution Overview
Problem
Existing display panels face challenges in expanding the low-gray-scale driving range without increasing power consumption by modifying the physical properties of the driving transistor.
Innovation Solution
Applying an electrical signal to the back-gate electrode of the driving transistor to enhance the low-gray-scale driving range and display capability without altering the physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the physical properties of the driving transistor are modified to expand the low-gray-scale driving range, then the low-gray-scale display capability is enhanced, but the power consumption of the driving transistor increases
Solution Approach 1:
The patent divides the gate control into two independent parts: a main gate electrode and a back-gate electrode. This segmentation allows independent control of the driving transistor's threshold voltage and current, enabling precise low-gray-scale control without increasing overall power consumption. The back-gate electrode specifically adjusts the threshold voltage to expand the low-gray-scale driving range while the main gate maintains normal operation.
Solution Approach 2:
The patent changes the electrical parameters of the driving transistor dynamically by applying different voltages to the back-gate electrode. By adjusting the back-gate voltage, the threshold voltage of the driving transistor is modified to accommodate low-gray-scale display requirements. This parameter adjustment enables expanded driving range without permanent physical modification that would increase power consumption.
2Measurement precision
If the physical properties of the driving transistor are altered to expand the low-gray-scale driving range, then the output signal control for low-gray-scale display is improved, but the device complexity increases
Solution Approach 1:
The gate structure is segmented into a main gate electrode and a back-gate electrode, allowing independent control functions. The back-gate electrode specifically handles threshold voltage adjustment for low-gray-scale precision control, while the main gate handles primary switching. This functional segmentation achieves precise output signal control without requiring complex physical property modifications throughout the entire transistor structure.
Solution Approach 2:
The back-gate electrode acts as an intermediary element that mediates between the control circuit and the driving transistor channel. By introducing this intermediate control point, the patent achieves precise output signal control for low-gray-scale display without directly complicating the main transistor structure. The back-gate serves as a buffer that enables fine-tuned control while maintaining the simplicity of the primary transistor design.
Data Source
AI summary
A display panel in accordance with one or more embodiments of the present disclosure includes a first pixel including a first light-emitting diode, and a first pixel circuit including a first driving transistor electrically connected to the first light-emitting diode, and including a first input electrode, a first output electrode, a first control electrode, and a first sub-control electrode, and a first main light-emission transistor connected in series with the first driving transistor, and configured to be controlled by a first control signal, and a second pixel including a second light-emitting diode, and a second pixel circuit including a second driving transistor electrically connected to the second light-emitting diode, and including a second input electrode, a second output electrode, a second control electrode, and a second sub-control electrode configured to receive the first control signal, and a second main light-emission transistor connected in series with the second driving transistor.