Display Device Pixel Circuit Overlapping Data Writing and Light Emission
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Solution Overview
Problem
Existing display devices face challenges in displaying accurate and clear 3D stereoscopic images due to insufficient initialization and compensation of data voltage, threshold voltage, and light emission periods, leading to increased power consumption and non-uniform luminance, which complicates pixel circuit structures and reduces manufacturing yield and aperture ratio.
Innovation Solution
A display device with a simplified pixel circuit and driving method that includes a reset period, threshold voltage compensation period, data writing period, and light emitting period, where the data writing and light emitting periods overlap, ensuring sufficient voltage compensation and power supply without additional voltage wires, thus improving image uniformity and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed driving mode is used to display 3D stereoscopic images, then display speed and responsiveness are improved, but initialization of data voltage, compensation of threshold voltage, writing of data, and light emission periods are not sufficiently ensured, leading to inaccurate luminance
Solution Approach 1:
The patent applies preliminary action by performing threshold voltage compensation before data writing in a dedicated compensation period. This ensures that transistor threshold voltages are calibrated in advance, allowing high-speed data writing without compromising luminance accuracy. The compensation period is inserted between the reset period and data writing period, enabling preliminary voltage stabilization before the high-speed display operation begins.
2Stability of the object's composition
If additional power supply wires are added to ensure stable voltage supply for data voltage storage, then voltage stability is improved, but pixel circuit structure becomes complicated and aperture ratio decreases
Solution Approach 1:
The patent extracts the voltage stability function from separate power supply wires and integrates it into the existing pixel circuit structure. By using the storage capacitor and switching transistor in conjunction with the data line, the circuit achieves stable voltage supply without requiring additional dedicated power supply wires. This extraction of the voltage stabilization function from separate wiring allows the pixel circuit to maintain simplicity while ensuring voltage stability during the frame holding period.
Solution Approach 2:
The patent applies multi-functionality by making the storage capacitor serve dual purposes: storing data voltage and providing stable voltage supply during the frame holding period. The same switching transistor that controls data writing also manages voltage supply stability. This universal use of existing components eliminates the need for separate power supply wires, reducing structural complexity while maintaining voltage stability.
3Stability of the object's composition
If additional power supply wires are added to ensure stable voltage supply, then voltage stability is improved, but production yield decreases due to more complex pixel circuit structure
Solution Approach 1:
The patent extracts the voltage stability function from separate power supply wires and integrates it into the existing pixel circuit structure. By using the storage capacitor and switching transistor in conjunction with the data line, the circuit achieves stable voltage supply without requiring additional dedicated power supply wires. This extraction of the voltage stabilization function from separate wiring allows the pixel circuit to maintain simplicity while ensuring voltage stability during the frame holding period.
Solution Approach 2:
The patent applies multi-functionality by making the storage capacitor serve dual purposes: storing data voltage and providing stable voltage supply during the frame holding period. The same switching transistor that controls data writing also manages voltage supply stability. This universal use of existing components eliminates the need for separate power supply wires, reducing structural complexity while maintaining voltage stability.
4Manufacturing precision
If data writing period and light emitting period are separated, then data writing accuracy is improved, but frame rate decreases and display responsiveness is reduced
Solution Approach 1:
The patent merges the data writing period and light emitting period into overlapping time intervals. During the light emitting period of the previous frame, the data writing for the current frame begins to overlap. This merging allows both operations to proceed simultaneously, maintaining data writing accuracy while increasing frame rate and display responsiveness. The storage capacitor holds the written data voltage throughout the overlapping period, ensuring accuracy is maintained despite the time overlap.
Data Source
AI summary
A display device comprising a display panel including a plurality of pixels configured to write a first image data signal corresponding to a corresponding frame for a first frame and emits light according to driving current depending on a second image data signal corresponding to a previous frame is disclosed. In one aspect, the first frame includes a reset period of resetting data voltage according to the second image data signal, a compensating period of compensating threshold voltages of driving transistors of the pixels, a data writing period of transferring scan signals corresponding to the pixels in sequence, writing the first image data signal, and a light emitting period of simultaneously emitting light according to the second image data signal, wherein the data writing period and the light emitting period frame are overlap each other.