Display Driving Method Threshold Voltage Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In organic light emitting display devices, luminance differences between pixels due to threshold voltage deviations lead to visual defects, and existing compensation methods are inadequate as resolution increases, requiring reduced compensation time without increasing data lines.
Innovation Solution
A display device driving method that provides a reference voltage and data signal in one frame period, with a compensation signal generated by comparing the reference voltage from the previous frame period, allowing for sufficient threshold voltage compensation without increasing the number of data lines by overlapping or varying the timing of initialization, reference, and data signals across frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the number of data lines is increased to extend compensation time, then the compensation time for threshold voltage is increased, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the reference voltage signal and data signal into a single data line transmission channel. The reference voltage signal is transmitted during a specific time period (e.g., front porch period) within the same frame period when data signals are transmitted, eliminating the need for separate data lines for compensation while ensuring sufficient compensation time
Solution Approach 2:
The patent employs periodic transmission of reference voltage signals within each frame period. The reference voltage signal is transmitted at specific periodic intervals (e.g., during front porch periods) to continuously provide compensation data without requiring additional permanent infrastructure, thus maintaining compensation capability while reducing structural complexity
2Manufacturing precision
If the resolution of the display device is increased, then the image quality is improved, but the compensation time is reduced
Solution Approach 1:
The patent performs threshold voltage compensation in advance by transmitting the reference voltage signal before the main data signal transmission within the same frame period. Specifically, the reference voltage is provided during the front porch period, allowing the pixel circuit to complete compensation operations before receiving the actual display data, thus ensuring sufficient compensation time even at high resolutions
Solution Approach 2:
The patent dynamically adjusts the timing and allocation of signal transmission within the frame period. By utilizing previously unused time slots (front porch period) and dynamically scheduling the reference voltage transmission, the system adapts to high-resolution requirements without compromising compensation time, maintaining flexibility in signal timing
Data Source
AI summary
A display device driving method includes: providing a reference voltage for compensating a threshold voltage of a driving transistor in a pixel; and providing a data signal to the pixel, wherein providing the reference voltage, and providing the data signal to the pixel are performed in a first frame period, and a second frame period successive to the first frame period, wherein the display device driving method further comprises providing a compensation signal generated by comparing a data signal with a reference voltage provided in a previous frame period of each frame period to the pixel before providing the reference voltage is ended.