Anti-flicker Display Device with Auxiliary Voltage Sensing
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Solution Overview
Problem
Liquid crystal display devices face issues with maintaining optimal luminance due to voltage fluctuations, leading to potential flicker and degradation in image quality, as existing technologies lack effective mechanisms to sense and compensate for changes in auxiliary voltages stored in auxiliary pixels.
Innovation Solution
A display device incorporating a sensing circuit to measure changes in auxiliary voltages stored in auxiliary pixels, generating compensation voltage information to adjust driving voltages and image data gradation, ensuring consistent luminance across frames and preventing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a liquid crystal display device operates without voltage compensation, then the device structure remains simple, but luminance stability deteriorates causing flicker
Solution Approach 1:
The patent applies preliminary action by measuring the auxiliary voltage at the beginning of each frame period and using this measurement to compensate for voltage drops throughout the entire frame. The sensing circuit measures the auxiliary voltage stored in the auxiliary pixel, and the timing controller uses this information to adjust the data signal, preventing luminance instability before it occurs.
Solution Approach 2:
The patent implements feedback by using the measured auxiliary voltage information to adjust subsequent data signals. The sensing circuit continuously monitors the auxiliary voltage, and when voltage drop is detected, the timing controller compensates by adjusting the data signal level, creating a closed-loop feedback system that maintains luminance stability.
2Measurement precision
If auxiliary pixels are added to store auxiliary voltage, then voltage measurement capability is improved, but pixel array complexity increases
Solution Approach 1:
The patent applies universality by making the auxiliary pixel serve multiple functions: it acts as both a display element and a sensing element for measuring auxiliary voltage. The auxiliary pixel is integrated into the pixel array structure and shares common circuitry with display pixels, allowing voltage measurement without adding separate dedicated sensing components.
Solution Approach 2:
The auxiliary pixel performs self-service by storing the auxiliary voltage that needs to be measured and providing this information back to the control circuitry. The pixel itself maintains the voltage level that serves as the measurement reference, eliminating the need for external voltage storage components.
3Reliability
If real-time voltage compensation is implemented, then image quality is improved, but processing complexity increases
Solution Approach 1:
The patent applies partial action by implementing voltage compensation only for the auxiliary voltage parameter that most significantly affects luminance stability, rather than compensating for all possible voltage variations. The sensing circuit measures only the auxiliary voltage at strategic points, and compensation is applied selectively based on this partial measurement, reducing processing complexity while maintaining image quality.
Data Source
AI summary
A display device may include display pixels configured to emit light at a luminance corresponding to a data signal, at least one auxiliary pixel configured to store an auxiliary voltage, a gate driver configured to supply a gate signal to the display pixels and the auxiliary pixel, a data driver configured to convert image data into the data signal, and supply an auxiliary voltage having a preset level to the auxiliary pixel. A sensing circuit is configured to sense a change in the auxiliary pixel for each frame, and generate compensation voltage information. A timing controller is configured to convert an image signal into the image data, and generate a driving voltage control signal. A voltage generation unit is configured to generate a driving voltage corresponding to the driving voltage control signal, and generate the reference gamma voltage based on the driving voltage.