Gamma Voltage Control Circuit for Panel Power Noise

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Solution Overview

Problem

Noise in panel power voltage due to high resolution, high luminance, high frame rate, and material changes in display panels leads to undesired luminance due to differences between first and second reference voltages, deteriorating display quality.

Innovation Solution

A gamma voltage control circuit that includes amplifiers and resistor strings to quickly reflect changes in panel power voltage as first and second reference voltages, using low dropout regulators and differential amplifiers to maintain consistent voltage levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If high resolution, high luminance, and high frame rate are implemented in the display panel, then display quality is improved, but noise in panel power voltage increases causing undesired luminance

Engineering Contradiction:

ImproveluminanceVSAvoidnoise in panel power voltage

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

A gamma voltage control circuit is introduced as an intermediary between the panel power voltage source and the gamma reference voltage generator. This circuit includes a first amplifier that generates a first primitive reference voltage based on the panel power voltage, and a second amplifier that generates the first reference voltage based on the first primitive reference voltage, panel power voltage, and internal power voltage. This intermediary structure allows the reference voltages to quickly track panel power voltage changes, preventing noise from causing luminance errors.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The gamma voltage control circuit implements feedback by continuously monitoring the panel power voltage and adjusting the reference voltages accordingly. The first and second amplifiers use the panel power voltage as input to generate updated reference voltages, creating a feedback loop that ensures reference voltages remain synchronized with power voltage fluctuations, thereby eliminating the harmful effect of noise on display luminance.

Inventive Principle:

Principle #23Feedback

2Reliability

If conventional voltage control is used, then device complexity is low, but reference voltages do not quickly reflect panel power voltage changes causing luminance errors

Engineering Contradiction:

Improvedisplay qualityVSAvoidgamma voltage control circuit

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The gamma voltage control circuit is segmented into multiple functional modules: a first amplifier for generating the first primitive reference voltage, a second amplifier for generating the first reference voltage, and additional components for generating the second reference voltage. This segmentation allows each module to perform a specific function, making the complex voltage control task manageable while ensuring that reference voltages quickly and accurately reflect panel power voltage changes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces intermediate voltage signals (first primitive reference voltage, internal power voltage) as mediators between the panel power voltage and the final gamma reference voltage. These intermediate signals allow for staged processing and adjustment, enabling the system to handle complexity in a structured manner while maintaining reliability of the final output.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Prevents undesired luminance by ensuring reference voltages quickly follow panel power voltage changes, enhancing display quality by maintaining consistent voltage differences.

Implementation Method 1

a first amplifier configured to generate a first primitive reference voltage based on a panel power voltage applied to a display panel

Methodology Applied

Scientific EffectElectrical amplification and voltage regulation:

Implementation Method 2

a second amplifier configured to generate a first reference voltage based on the first primitive reference voltage, the panel power voltage and an internal power voltage

Methodology Applied

Scientific EffectElectrical amplification and differential voltage generation:

Implementation Method 3

using low dropout regulators and differential amplifiers to maintain consistent voltage levels

Methodology Applied

Scientific EffectElectrical conduction and voltage regulation: Conduction (electrical)

Implementation Method 4

using low dropout regulators and differential amplifiers to maintain consistent voltage levels

Methodology Applied

Scientific EffectElectrical conduction and voltage differentiation: Conduction (electrical)

Data Source

PatentUS12451097B2Gamma voltage control circuit, display apparatus including the same and electronic apparatus including the same

Publication Date: 2025.10.21 SAMSUNG DISPLAY CO LTD

AI summary

A gamma voltage control circuit includes a first amplifier and a second amplifier. The first amplifier is configured to generate a first primitive reference voltage based on a panel power voltage applied to a display panel. The second amplifier is configured to generate a first reference voltage based on the first primitive reference voltage, the panel power voltage and an internal power voltage.