Display Luminance Compensation for Variable Refresh Rate Panels
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Solution Overview
Problem
The variable refresh rate (VRR) technology in LCD panels requires large storage space for luminance compensation data, leading to increased manufacturing costs, chip size, power consumption, and response delays due to the need for extensive storage in the timing controller.
Innovation Solution
A method and display device that measures the duration of a frame start signal to calculate the current driving frequency, updates a chromaticity coordinate accuracy lookup table when the frequency is below a threshold, and adjusts luminance using the updated table, employing segmented and gradient updating to reduce storage space and ensure precise luminance compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large storage space is allocated in the timing controller for luminance compensation data, then luminance compensation accuracy is improved, but manufacturing cost and chip size increase
Solution Approach 1:
The patent segments the luminance compensation data storage by creating a frequency-point-specific storage structure. Instead of storing all compensation data uniformly, the system divides storage into frequency-specific segments (e.g., 60Hz, 75Hz, 85Hz, 90Hz, 100Hz, 120Hz, 144Hz, 165Hz, 180Hz, 240Hz), where each frequency point has its own dedicated storage space. This segmentation allows the timing controller to allocate minimal storage for each frequency point rather than maintaining large universal storage, thereby reducing overall chip size while preserving compensation accuracy for the currently active frequency.
Solution Approach 2:
The patent implements dynamic storage allocation by switching between different frequency-point-specific compensation data based on the current refresh rate. The timing controller dynamically selects and loads only the compensation data corresponding to the current operating frequency, rather than maintaining all compensation data simultaneously in large storage. This dynamic approach enables the system to achieve high luminance compensation accuracy for the active frequency while keeping the overall storage space requirement minimal, thus reducing chip size.
2Measurement precision
If large storage space is allocated in the timing controller for luminance compensation data, then luminance compensation accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the luminance compensation data storage by creating a frequency-point-specific storage structure. Instead of storing all compensation data uniformly, the system divides storage into frequency-specific segments (e.g., 60Hz, 75Hz, 85Hz, 90Hz, 100Hz, 120Hz, 144Hz, 165Hz, 180Hz, 240Hz), where each frequency point has its own dedicated storage space. This segmentation allows the timing controller to allocate minimal storage for each frequency point rather than maintaining large universal storage, thereby reducing overall chip size while preserving compensation accuracy for the currently active frequency.
Solution Approach 2:
The patent implements dynamic storage allocation by switching between different frequency-point-specific compensation data based on the current refresh rate. The timing controller dynamically selects and loads only the compensation data corresponding to the current operating frequency, rather than maintaining all compensation data simultaneously in large storage. This dynamic approach enables the system to achieve high luminance compensation accuracy for the active frequency while keeping the overall storage space requirement minimal, thus reducing chip size.
3Measurement precision
If large storage space is allocated in the timing controller for luminance compensation data, then luminance compensation accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic storage allocation by switching between different frequency-point-specific compensation data based on the current refresh rate. The timing controller dynamically selects and loads only the compensation data corresponding to the current operating frequency, rather than maintaining all compensation data simultaneously in large storage. This dynamic approach enables the system to achieve high luminance compensation accuracy for the active frequency while keeping the overall storage space requirement minimal, thus reducing chip size.
Solution Approach 2:
The patent applies local quality by optimizing storage allocation specifically for luminance compensation data at different frequency points. Instead of uniformly allocating large storage space for all possible compensation scenarios, the system provides adequate storage only for the compensation data needed at each specific frequency point, while using minimal or no storage for other purposes. This localized optimization reduces overall power consumption while maintaining compensation accuracy.
4Measurement precision
If large storage space is allocated in the timing controller for luminance compensation data, then luminance compensation accuracy is improved, but response delay increases
Solution Approach 1:
The patent applies preliminary action by pre-organizing and pre-loading frequency-point-specific luminance compensation data into dedicated storage areas before they are needed. The timing controller maintains ready-to-use compensation data for each frequency point in its respective storage space, so when a refresh rate change occurs, the system can immediately retrieve and apply the appropriate compensation data without requiring time-consuming data processing or memory allocation operations, thereby minimizing response delay.
Solution Approach 2:
The patent segments the luminance compensation data storage by creating a frequency-point-specific storage structure. Instead of storing all compensation data uniformly, the system divides storage into frequency-specific segments (e.g., 60Hz, 75Hz, 85Hz, 90Hz, 100Hz, 120Hz, 144Hz, 165Hz, 180Hz, 240Hz), where each frequency point has its own dedicated storage space. This segmentation allows the timing controller to allocate minimal storage for each frequency point rather than maintaining large universal storage, thereby reducing overall chip size while preserving compensation accuracy for the currently active frequency.
Data Source
AI summary
A method includes: measuring a duration of the high level of a frame start signal of a display device; calculating a current driving frequency for the display device based on the duration of the high level; updating a chromaticity coordinate accuracy lookup table for a predetermined target grayscale when the current driving frequency is lower than a preset threshold; and adjusting luminance of the display device based on the updated chromaticity coordinate accuracy lookup table.