Display Panel Driver Gamma Control Interpolation

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Solution Overview

Problem

Existing display apparatuses experience significant luminance changes when adjusting luminance setting values, leading to deteriorated display quality due to improper interpolation methods for generating reference luminance values.

Innovation Solution

The display apparatus determines target luminances for target luminance setting values and grayscale values by using adjacent luminance values and grayscale values, rather than relying on the luminance of the same grayscale value for adjacent measured luminance setting values, thereby enhancing interpolation accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the reference luminance is generated using a conventional interpolation method based on the same grayscale value for adjacent luminance setting values, then the interpolation process is simple, but the luminance change amount becomes great when a luminance setting value is changed, deteriorating display quality

Engineering Contradiction:

Improveinterpolation process complexityVSAvoidluminance change amount

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The patent changes the interpolation parameter from grayscale value to luminance value. Instead of interpolating at the same grayscale value for adjacent luminance setting values, the system interpolates at the same luminance value, which properly accounts for the nonlinear relationship between grayscale and luminance. This parameter change resolves the contradiction by reducing luminance change amount while maintaining interpolation simplicity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the conventional linear interpolation method with a gamma-corrected interpolation method that uses luminance values raised to the power of 1/gamma. This substitution transforms the interpolation mechanism to account for the human visual system's nonlinear perception of luminance, thereby reducing perceived luminance changes while keeping the computational process straightforward.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Illumination intensity

If the reference luminance is generated by storing reference luminances for all luminance setting values, then the luminance change amount is reduced, but the memory storage requirement and system complexity increase

Engineering Contradiction:

Improveluminance change amountVSAvoidmemory storage requirement

Core Design Contradiction:

Illumination intensityVSQuantity of substance

Solution Approach 1:

The patent performs preliminary measurement and storage of reference luminances only at specific grayscale values (e.g., 0, 32, 64, 96, 128, 160, 192, 224, 255) rather than all possible values. The gamma-corrected interpolation method then enables accurate reference luminance generation for any luminance setting value based on these pre-measured points, reducing memory storage requirements while maintaining low luminance change amounts.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

By changing the interpolation approach to use luminance-based indexing with gamma correction, the system achieves accurate reference luminance generation with fewer stored measurement points. This parameter change allows the system to reduce the quantity of stored data while maintaining or improving luminance control accuracy.

Inventive Principle:

Principle #35Parameter changes

3Speed

If the conventional interpolation method is used, then the system operation is fast, but the display quality deteriorates due to great luminance changes visible to the user

Engineering Contradiction:

Improveinterpolation speedVSAvoiddisplay quality

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The patent applies gamma correction to the interpolation process by raising luminance values to the power of 1/gamma during interpolation and adjusting the final luminance accordingly. This parameter transformation aligns the interpolation with human visual perception characteristics, reducing visible luminance changes and improving display quality while maintaining computational efficiency through straightforward power operations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system uses pre-measured reference luminances at specific grayscale values as feedback points to validate and calibrate the gamma-corrected interpolation method. This feedback mechanism ensures that the interpolation accurately reflects actual display characteristics, thereby improving display quality without sacrificing interpolation speed.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250148956A1Display apparatus and method of gamma control using the same

Publication Date: 2025.05.08 SAMSUNG DISPLAY CO LTD

AI summary

A display apparatus includes a display panel and a display panel driver. The display panel driver drives the display panel. The display panel driver determines a target luminance for a target luminance setting value and a target grayscale value based on a first luminance for a first adjacent luminance setting value and a first grayscale value and a second luminance for a second adjacent luminance setting value and a second grayscale value. At least one selected from the first grayscale value and the second grayscale value is different from the target grayscale value.