Display Brightness Control With Stepwise Gamma Voltage Correction
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Solution Overview
Problem
Existing display technologies face challenges in maintaining optimal display quality and luminance across varying brightness levels, leading to inconsistencies and errors in image rendering.
Innovation Solution
A display device and driving method that adjusts power voltage step-by-step based on display brightness values, using lookup tables to correct gamma voltage values and set offsets, ensuring linear or non-linear data voltage changes to achieve maximum luminance and reduce luminance errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If power voltage is adjusted continuously to achieve optimal luminance at each brightness level, then display quality is improved, but power supply control complexity increases
Solution Approach 1:
The power voltage adjustment is divided into discrete steps rather than continuous adjustment. The voltage is segmented into specific levels (e.g., V1, V2, V3) corresponding to different brightness ranges, simplifying the control mechanism while maintaining luminance accuracy across varying display brightness values.
Solution Approach 2:
The system pre-establishes the relationship between display brightness values and corresponding power voltage levels through lookup tables or pre-calibrated parameters. This preliminary configuration allows the controller to directly select appropriate voltage steps without complex real-time calculations, reducing control complexity while ensuring accurate luminance output.
2Measurement precision
If gamma voltage values are corrected using step-based power voltage adjustment, then luminance errors are reduced, but processing complexity increases
Solution Approach 1:
Gamma voltage correction values are pre-calculated and stored for each power voltage step. The system uses lookup tables containing corrected gamma values corresponding to each voltage level, eliminating the need for complex real-time gamma calculations and reducing processing complexity while maintaining luminance precision.
Solution Approach 2:
The patent introduces an intermediary correction mechanism where offset values are added to standard gamma voltages based on the current power voltage step. This intermediary correction layer simplifies the overall processing by separating the base gamma generation from the step-specific adjustments, making the system more manageable while reducing luminance errors.
3Manufacturing precision
If data voltage changes non-linearly at brightness transition points, then display quality is improved, but control complexity increases
Solution Approach 1:
The system dynamically adjusts data voltage characteristics based on the current brightness range. Within each brightness step, the data voltage changes linearly for simplicity, but at transition points between steps, the system applies dynamic correction to achieve non-linear changes that maintain image rendering consistency across the full brightness range.
Solution Approach 2:
Different voltage change characteristics are applied to different brightness regions. The system uses linear voltage changes for most brightness levels to simplify control, but applies non-linear correction locally at transition points where brightness steps occur, ensuring high image quality at critical boundaries without complicating the overall control system.
Data Source
AI summary
The display device changes a power voltage step by step based on the display brightness value (DBV) and displays an image with the maximum luminance corresponding to the DBV. The display device may sense a first DBV where a step occurs in the power voltage, may set an offset for the DBV based on the first DBV, may correct gamma voltage values based on the DBV based on the offset, and may generate a data voltage based on the corrected gamma voltage values.