Gamma Adjustment for AMOLED Panels Using Curve Fitting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display technologies face inefficiencies in gamma adjustment, leading to issues like low grayscale black bands, bright bands, and color shifts due to gamma voltage reversal, particularly in AMOLED panels which have process differences, requiring individual gamma voltage settings for each panel.
Innovation Solution
A gamma adjustment method and device that determine whether a display panel is a first or non-first panel in a group, adjusting data line input voltages based on reference gamma voltages and sampled optical parameters, and fitting curves to adjust gamma voltages for accurate grayscale representation, ensuring consistent gamma voltage trends across panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual gamma voltage settings are performed for each AMOLED panel due to process differences, then manufacturing precision is improved, but adjustment time increases significantly
Solution Approach 1:
The patent performs preliminary gamma voltage adjustment on a first panel in the group, establishes reference gamma voltages, and then applies these reference values to subsequent panels. This preliminary action on the first panel eliminates the need to perform complete individual adjustments on every panel, significantly reducing total adjustment time while maintaining manufacturing precision through the reference-based approach.
Solution Approach 2:
The patent copies the gamma voltage settings from the first panel (which has been individually adjusted) to create reference gamma voltages that are then applied to other panels in the group. This copying mechanism allows subsequent panels to inherit proven working parameters, reducing adjustment time while maintaining the manufacturing precision achieved through the initial individual adjustment.
2Device complexity
If gamma voltage is adjusted without considering grayscale binding points, then adjustment process is simplified, but display quality deteriorates due to black bands and bright bands
Solution Approach 1:
The patent segments the grayscale range into multiple binding points (e.g., 0, 64, 128, 192, 255) and performs targeted gamma voltage adjustments at each specific binding point rather than uniform adjustments across all grayscales. This segmentation ensures that each critical grayscale region receives appropriate correction, preventing black bands and bright bands while maintaining a structured, manageable adjustment process.
Solution Approach 2:
The patent changes the gamma voltage parameter specifically at identified grayscale binding points based on sampled optical parameters. By focusing parameter changes only where needed (at binding points rather than all grayscales), the patent achieves precise grayscale uniformity without unnecessarily complicating the overall adjustment process.
3Productivity
If gamma voltage adjustment is performed without sampling optical parameters, then adjustment speed increases, but display quality decreases due to color shifts and black bands
Solution Approach 1:
The patent implements feedback by sampling optical parameters (luminance, color coordinates) at each grayscale binding point during adjustment. This sampled feedback information is used to determine the appropriate gamma voltage corrections needed. The feedback mechanism ensures display quality is maintained while the automated sampling process keeps adjustment speed high, preventing color shifts and black bands.
Solution Approach 2:
The system performs self-service by automatically sampling optical parameters and using this information to self-correct gamma voltage settings at each binding point. This automated self-adjustment process maintains high productivity while ensuring display quality through continuous optical parameter verification and correction.
4Productivity
If reference gamma voltages are used for non-first panels in a group, then adjustment efficiency is improved, but individual panel variations may not be fully addressed
Solution Approach 1:
The patent performs preliminary individual adjustment on the first panel to establish accurate reference gamma voltages. Subsequent panels in the group then use these reference values, achieving high adjustment efficiency. The preliminary action on the first panel captures panel-specific characteristics that become the reference for the group, balancing efficiency with panel-specific accuracy.
Solution Approach 2:
The patent allows parameter changes (gamma voltages) to be established through individual adjustment on the first panel and then applied as references. This approach enables the system to capture and propagate panel-specific parameter variations efficiently across the group, maintaining both productivity and manufacturing precision.
Data Source
AI summary
A gamma adjustment method and an adjustment device for a display panel. The gamma adjustment method describes that if the absolute value of the gamma voltage corresponding to the current grayscale binding point is smaller than the absolute value of the gamma voltage corresponding to the previous grayscale binding point, obtaining absolute values of gamma voltages corresponding to at least two grayscale binding points located previous to the current grayscale binding point. Obtaining a first relationship curve by fitting the respective grayscales corresponding to the at least two grayscale binding points and the absolute values of the gamma voltages corresponding to the at least two grayscale binding points, and adjusting the gamma voltage corresponding to the current grayscale binding point to locate the absolute value of the adjusted gamma voltage corresponding to the current grayscale binding point on the first relationship curve.