Display Timing Controller Luminance Flicker Compensation
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Solution Overview
Problem
Display devices experience luminance differences when driven at variable frequencies, leading to flicker issues, particularly noticeable when the frequency is reduced.
Innovation Solution
A display device with a timing controller that applies a compensation value to input grayscales based on the previous frame's driving frequency, adjusting data voltages to maintain consistent luminance, either by decreasing or maintaining the compensation value depending on the current frequency, to minimize flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is driven at a variable driving frequency to enable flexible frame rate adjustment, then the adaptability and energy efficiency are improved, but luminance differences and flicker occur when the driving frequency is changed
Solution Approach 1:
The timing controller applies a compensation value to the input grayscales in advance before the driving frequency changes, based on the previous frame's driving frequency. This preliminary compensation adjusts the output grayscales proactively to counteract the luminance differences that will occur when the driving frequency changes, thereby maintaining stable luminance during variable frequency operation
Solution Approach 2:
The patent changes the compensation value parameter dynamically based on the driving frequency. When the driving frequency is high, a first compensation value is applied; when the driving frequency is low, a second (different) compensation value is applied. This parameter adjustment allows the system to adapt to different driving conditions and maintain consistent luminance across variable frame rates
2Stability of the object's composition
If the compensation value is adjusted frequently to maintain luminance stability during frequency changes, then the luminance consistency is improved, but the device complexity and control difficulty increase
Solution Approach 1:
The timing controller uses feedback from the previous frame's driving frequency to determine the compensation value for the current frame. By referencing the actual driving frequency that occurred in the previous frame, the system can accurately compensate for luminance changes without requiring complex real-time measurement or prediction mechanisms, thus maintaining simplicity while achieving stability
Data Source
AI summary
A display device includes a display unit including pixels, a timing controller which generates output grayscales based on input grayscales by applying a compensation value corresponding to a driving frequency of a previous frame to the input grayscales, and a data driver which generates data voltages corresponding to the output grayscales and supplies the data voltages to the display unit. When the display unit is driven at a first driving frequency, the timing controller corrects the compensation value corresponding to the first driving frequency in a way such that a luminance of the display unit is lowered on a frame-by-frame basis.