Gamma Set Data Correction for Display Brightness Reversal
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Solution Overview
Problem
Display devices experience a brightness reversal phenomenon due to incorrect gamma set data, where the screen becomes brighter despite a lowered dimming level, caused by high gamma set data having greater register values than low gamma set data, leading to improper grayscale voltage generation.
Innovation Solution
A device and method for correcting gamma set data, which includes a memory to store high and low gamma set data, a voltage calculator to calculate reference and fixed voltage values, and a corrector to compare and update register values based on specific formulas to prevent brightness reversal by ensuring accurate grayscale voltage generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high gamma set data has greater register values than low gamma set data, then the grayscale voltage generation follows conventional data structure, but brightness reversal occurs where the screen becomes brighter despite lowered dimming level
Solution Approach 1:
The patent applies preliminary action by correcting the gamma set data before it is used for grayscale voltage generation. The correction process adjusts the register values in advance to prevent the brightness reversal phenomenon from occurring during display operation. By preprocessing the data to ensure proper ordering and relationships between high and low gamma set values, the system eliminates the harmful brightness reversal effect before it can manifest.
2Manufacturing precision
If gamma set data is not corrected, then the data structure remains simple, but grayscale voltage generation becomes inaccurate leading to display errors
Solution Approach 1:
The patent applies segmentation by dividing the gamma set data correction into distinct functional modules: a correction value generator that calculates correction values based on reference voltages, a comparator that identifies which register values need correction, and a corrector that applies the corrections. This modular approach breaks down the complex correction process into manageable segments, making it easier to implement and maintain while achieving accurate grayscale voltage generation.
3Ease of operation
If register values are not properly adjusted, then the gamma set data generation is simple, but the display device cannot maintain intended brightness levels across different dimming levels
Solution Approach 1:
The patent applies feedback by using the reference voltage as a benchmark to determine whether correction is needed. The system compares the generated grayscale voltage against the reference voltage and uses this feedback to adjust the register values accordingly. This feedback mechanism ensures that the gamma set data accurately reflects the intended brightness levels across all dimming levels, maintaining brightness consistency while keeping the operation straightforward.
Data Source
AI summary
A device for correcting gamma set data includes a memory, voltage calculator, and a corrector. The memory stores high gamma set data including first register values set per grayscale and low gamma set data including second register values set per grayscale and reference register value. The voltage calculator calculates a reference voltage value of the low gamma set data based on the reference register value and calculates fixed voltage values per grayscale of the low gamma set data based on the second register values. The corrector compares the first register values with the second register values and corrects the second register values based on a comparison result.