Display Timing Controller Variable Frame Compensation
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Solution Overview
Problem
Display apparatuses experience image quality deterioration when input images have variable frequencies, as the fixed driving frequency of the display panel cannot match the changing frame frequency, leading to inconsistent luminance and potential flicker recognition by users.
Innovation Solution
A display apparatus and method that utilize image quality compensation data stored in memory, with a timing controller adjusting the display based on both the driving frequency of the panel and the frame frequency of the input image, using first and second image quality compensation data to maintain consistent luminance across varying frame frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the display panel operates at a fixed driving frequency, then the display timing is stable and predictable, but image quality deteriorates when the input image frequency differs from the driving frequency due to inconsistent luminance and extended holding sections
Solution Approach 1:
The patent introduces dynamic adjustment mechanisms that allow the display system to adapt its timing and luminance parameters based on the input image frequency. The holding section duration and data voltage levels are dynamically modified according to the detected frame frequency, enabling the fixed-frequency display panel to handle variable-frequency inputs without quality deterioration.
Solution Approach 2:
The patent changes key operating parameters including the holding section length, data voltage amplitude, and gamma correction values based on the input image frequency. By adjusting these parameters dynamically, the system compensates for the mismatch between fixed display timing and variable input frequency, maintaining consistent luminance and image quality across different frame rates.
2Duration of action of moving object
If the holding section length increases to accommodate lower frame frequencies, then more time is available for voltage maintenance, but the discharged data voltage increases causing reduced maximum luminance and image quality
Solution Approach 1:
The patent applies a counterbalancing approach by increasing the data voltage amplitude proportionally when the holding section length increases. This voltage compensation counteracts the additional discharge that occurs during extended holding periods, preventing luminance reduction and maintaining consistent image brightness across different frame frequencies.
Solution Approach 2:
The patent dynamically adjusts the data voltage parameter based on the holding section duration. When lower frame frequencies require longer holding sections, the system increases the data voltage level to compensate for the additional charge discharge, thereby maintaining the maximum luminance and preventing image quality deterioration.
3Stability of the object's composition
If the display panel uses a fixed data enable section length, then the charging timing is consistent, but the holding section length varies with input frequency causing inconsistent luminance output
Solution Approach 1:
The patent introduces frequency-dependent parameter adjustments that modify the holding section length and associated voltage levels based on the detected input frame frequency. While the data enable section remains fixed for consistent charging timing, the subsequent holding period and voltage parameters are dynamically adjusted to compensate for frequency variations, maintaining luminance consistency across different frame rates.
Data Source
AI summary
A display apparatus is provided including a display panel, a memory configured to store first image quality compensation data corresponding to a driving frequency of the display panel, and second image quality compensation data corresponding to a frame frequency of an input image to the display panel, the second image quality compensation data corresponding to the first image quality compensation data adjusted based on a luminance value of the input image, and a timing controller configured to, based on the frame frequency of the image input to the display panel being varied, perform image quality compensation on the input image using the second image quality compensation data, and to control the display panel to display the input image based on the image quality compensation.