Display Brightness Control via Unified Gamma Lookup Table
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display brightness control methods require multiple memories to store lookup tables for each brightness adjustment point, leading to high costs and inaccurate brightness display when the current brightness is not at an existing adjustment point, as they rely on independent measurement procedures and linear interpolation.
Innovation Solution
A method and apparatus that use a preset gamma correction lookup table to determine input grayscale values corresponding to specific brightness values, allowing for accurate brightness control without the need to store gamma correction relationships at each brightness level, reducing hardware resources and ensuring uniform brightness across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple lookup tables are stored for each brightness adjustment point, then brightness control coverage is improved, but hardware cost and storage space increase
Solution Approach 1:
The patent merges multiple brightness adjustment levels into a single gamma correction lookup table. Instead of storing separate lookup tables for each brightness level, the system uses one unified table that can serve all brightness adjustment points, significantly reducing storage space while maintaining full brightness control coverage
Solution Approach 2:
The single gamma correction lookup table is designed to be universal and multi-functional, serving all brightness adjustment levels simultaneously. This universal table can provide accurate gamma correction for any brightness level through appropriate parameter selection, eliminating the need for multiple specialized tables
2Ease of operation
If linear interpolation is used for non-adjustment brightness points, then brightness control continuity is improved, but brightness accuracy deteriorates
Solution Approach 1:
The patent changes the approach from linear interpolation to gamma correction-based parameter transformation. By using the gamma correction lookup table with adjusted parameters for different brightness levels, the system maintains continuity while improving accuracy through non-linear gamma-corrected values instead of simple linear interpolation
3Measurement precision
If independent measurement procedures are performed for each brightness level, then measurement accuracy is improved, but measurement time and processing complexity increase
Solution Approach 1:
The patent performs gamma correction measurement and table generation as a preliminary action during manufacturing or initialization. The single gamma correction lookup table is pre-calculated and stored, eliminating the need for repeated measurements during operation. This preliminary measurement ensures high accuracy while reducing operational time and processing complexity
Solution Approach 2:
Instead of performing independent measurements for each brightness level, the system creates a single reference gamma correction table that is copied and applied across all brightness levels. This copying approach maintains measurement accuracy while dramatically reducing the time and complexity of repeated measurements
Data Source
AI summary
Methods and apparatuses for controlling brightness of a display are disclosed in the present disclosure. One method includes: determining a first brightness value of a display at a current brightness adjustment level; determining, based on a gamma correction lookup table, a first input grayscale value corresponding to the first brightness value, wherein the gamma correction lookup table comprises a gamma correction relationship between a brightness value of the display and an initial input grayscale value of the display at a predetermined brightness adjustment levels; and controlling an output brightness value of the display based on the first input grayscale value.