Display Panel Driving Method Using Compensation Voltage
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Solution Overview
Problem
Current display panels require an excessive driving voltage due to insufficient capability in peripheral driving circuits, leading to display distortion if the actual driving voltage on the data line does not reach the expected voltage.
Innovation Solution
A method for driving a display panel that involves supplying a compensation voltage to the second node of each pixel circuit, calculated as the difference between the original data voltage and the threshold voltage of the driving transistor, reducing the required driving voltage on the data line by using a compensation voltage within the range [−Vth_min, 0), where Vth_min is the minimum threshold voltage among all transistors, thereby reducing the demand on the peripheral driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the peripheral driving circuit is designed with insufficient capability, then the device complexity is reduced, but the display distortion occurs due to inadequate driving voltage
Solution Approach 1:
The patent introduces a compensation voltage parameter VS that is added to the original data voltage to form the driving voltage. By adjusting this voltage parameter, the driving transistor receives adequate voltage compensation without increasing the complexity of the peripheral driving circuit. The compensation voltage is calculated based on the threshold voltage characteristics of the driving transistor, ensuring reliable display operation while maintaining simple circuit design.
2Reliability
If the driving voltage on the data line is increased to meet the expected voltage requirement, then the display distortion is prevented, but the capability requirement of the peripheral driving circuit increases
Solution Approach 1:
The patent introduces a compensation voltage VS as an intermediary element that mediates between the original data voltage and the required driving voltage. Instead of directly increasing the data line driving voltage, the compensation voltage is applied to the second node of the pixel circuit through a separate path, effectively compensating for the threshold voltage drop without burdening the peripheral driving circuit with higher voltage requirements.
3Device complexity
If the compensation voltage VS is set to a more negative value, then the driving voltage requirement is reduced, but the risk of over-compensation and display distortion increases
Solution Approach 1:
The patent employs a feedback mechanism where the compensation voltage VS is determined based on the threshold voltage characteristics of the driving transistor. The system monitors and adjusts the compensation voltage to ensure it falls within the appropriate range, preventing over-compensation. This feedback control ensures that the driving voltage requirement is reduced while maintaining display quality within acceptable parameters.
Data Source
AI summary
A method for driving a display panel and a display device are provided. The driving method includes supplying, during a data writing stage of each row of pixel circuits, a driving voltage VA[i] to the data line corresponding to each of the pixel circuits in a row, and supplying a compensation voltage VS to the second node of each of the pixel circuits in the row, and VA[i]=Vdata[i]+Vth[i]+VS, where Vdata[i] is an original data voltage of an ith pixel circuit of the pixel circuits, i is a positive integer, Vth[i] is a threshold voltage of the driving transistor of the ith pixel circuit, and a range from which a value of the compensation voltage VS is selected is [−Vth_min, 0), and Vth_min is a minimum value among all of the threshold voltages of the driving transistors of the pixel circuits of the display panel.