Display Timing Controller Variable Refresh Rate Luminance Correction
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Solution Overview
Problem
In display devices using a variable refresh rate mode, luminance deviations occur due to different refresh rates, leading to image distortion and quality degradation, such as flickers, when subpixels are driven at various refresh rates.
Innovation Solution
A display device and driving method that detect variable information from vertical synchronization and data enable signals to correct luminance, utilizing a timing controller with a level shifter and control integrated circuit to generate control signals for compensating circuits, which adjust data voltages and reference voltages based on sensed characteristic values from subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable refresh rate mode is used to drive subpixels at different refresh rates according to image type, then adaptability to different image formats is improved, but luminance deviation occurs causing image distortion and flickers
Solution Approach 1:
The timing controller detects variable information from vertical synchronization signals and data enable signals to determine the actual refresh rate, then feeds back control signals to the gate driving circuit and data driving circuit to adjust driving parameters, thereby compensating for luminance deviations caused by variable refresh rates
Solution Approach 2:
The system dynamically changes driving parameters including reference voltages and data voltages based on the detected refresh rate. The timing controller adjusts the reference voltage generation and data voltage output according to the variable refresh rate information, maintaining stable luminance across different refresh rates
2Reliability
If fixed refresh rate is used to maintain stable luminance, then image quality is preserved, but adaptability to different image formats and types is reduced
Solution Approach 1:
The system transitions from a fixed refresh rate configuration to a dynamic refresh rate system. The timing controller continuously monitors vertical synchronization signals and data enable signals to detect variable refresh rate information, and dynamically adjusts gate driving and data driving operations accordingly, enabling the display to adapt to different image formats while maintaining luminance stability
3Reliability
If luminance correction is implemented through variable information detection, then image quality degradation is reduced, but device complexity increases due to additional control circuits
Solution Approach 1:
The timing controller performs multiple functions: it generates timing signals for display operation, detects variable refresh rate information from vertical synchronization and data enable signals, calculates refresh rates, and generates control signals for luminance correction. By making the timing controller multi-functional, the patent avoids adding separate dedicated circuits for each function
Data Source
AI summary
Embodiments of the present disclosure relate to a display device and driving method thereof. A display device of the present disclosure includes a display panel including a plurality of gate lines, a plurality of data lines, and a plurality of subpixels. The display device further includes a gate driving circuit for supplying scan signals to the plurality of gate lines, a data driving circuit for supplying data voltage to the plurality of data lines, and a timing controller. The timing controller is for controlling the gate driving circuit and the data driving circuit, and controlling a luminance of the plurality of subpixels according to a driving frequency of image data by detecting a variable information which is changed according to the driving frequency of the image data supplied from a host system.