Display Device Kickback Voltage Compensation Circuit
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Solution Overview
Problem
Display devices face challenges in achieving uniform luminance due to deviations in kickback voltage across pixels, which affect the consistency of light emission.
Innovation Solution
The implementation of a display device system that includes a display panel, a sensing driver, a driving controller, and a data driver. This system senses mobility and kickback voltages through sensing lines, generates compensation data to adjust image data, and outputs corrected data signals to pixels to compensate for deviations in kickback voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional display device is used without kickback voltage compensation, then the device complexity is low, but the luminance uniformity deteriorates due to kickback voltage deviations across pixels
Solution Approach 1:
The system performs preliminary sensing of pixel characteristics (mobility and kickback voltage) during a dedicated sensing period before normal display operation. This preliminary measurement allows the driving controller to pre-calculate compensation values that are stored and applied during subsequent image display, eliminating luminance uniformity issues before they manifest visually.
Solution Approach 2:
The sensing driver measures actual pixel characteristics including kickback voltage deviations, and this sensed data is fed back to the driving controller. The controller uses this feedback information to generate compensation values that adjust the data signals, creating a closed-loop system that continuously corrects luminance uniformity based on actual pixel performance.
2Manufacturing precision
If kickback voltage sensing and compensation is implemented, then the luminance uniformity is improved, but the device complexity increases due to additional sensing lines and processing circuits
Solution Approach 1:
The sensing driver is integrated with the existing data driver structure, sharing common circuitry and control logic where possible. The sensing operation merges with the normal display operation by utilizing the same pixel structures and incorporating sensing functions into the existing driver architecture, thereby reducing the impact of added complexity.
Solution Approach 2:
The sensing lines and sensing driver are designed to serve multiple functions: they not only measure kickback voltage but also can sense other pixel characteristics such as mobility and threshold voltage. This multi-functionality justifies the added complexity by providing comprehensive pixel characterization capabilities that benefit overall display performance.
3Measurement precision
If mobility sensing is performed during sensing period, then the kickback voltage compensation accuracy is improved, but the productivity decreases due to additional sensing period time
Solution Approach 1:
The system implements periodic sensing operations at specific intervals rather than continuous sensing. The sensing period is strategically placed between display frames or during blanking intervals, allowing accurate mobility and kickback voltage measurements to be taken periodically without continuously interrupting the display output, thus maintaining productivity while achieving measurement precision.
Data Source
AI summary
A display device includes a display panel which includes a pixel including a driving transistor and a light-emitting element, and a sensing line connected to the pixel. A sensing driver senses a first sensing signal corresponding to mobility of the driving transistor through the sensing line, and processes the first sensing signal to output first sensing data. A driving controller receives the first sensing data from the sensing driver, generates mobility compensation data and kickback compensation data based on the first sensing data, and converts image data into compensation image data by the mobility compensation data and the kickback compensation data. A data driver converts the compensation image data into a data signal and provides the data signal to the pixel.