Driver Chip Decoupling Capacitor for Display Noise Reduction

Solution Overview

Problem

Display panels experience a Moire pattern phenomenon when displaying certain patterns, leading to poor display quality due to coupling between digital and analog modules in driver chips, causing unstable data voltages and noise interference.

Innovation Solution

A driver chip with a digital module, an analog module, and a decoupling capacitor is used, where the decoupling capacitor is connected between the digital module and the reference voltage source to filter out noise and stabilize the reference voltage, ensuring stable Gamma voltage generation and improved display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If digital module and analog module are integrated in driver chip, then device functionality is improved, but coupling between modules causes noise interference and unstable data voltages

Engineering Contradiction:

Improvedevice functionalityVSAvoidnoise interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The driver chip is divided into separate digital module and analog module sections with clear spatial separation. The digital module contains digital signal processing circuits while the analog module contains the reference voltage source and Gamma voltage generation circuit. This segmentation reduces coupling between modules and minimizes noise interference from digital signals to analog circuits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A decoupling capacitor is introduced as an intermediary element between the digital module and the reference voltage source. The decoupling capacitor filters out high-frequency noise and voltage fluctuations from the digital module before they can affect the analog module, acting as a mediator that isolates the two modules while maintaining their functional connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If digital module and analog module are integrated in driver chip, then device functionality is improved, but coupling between modules causes unstable data voltages

Engineering Contradiction:

Improvedevice functionalityVSAvoiddata voltage stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The driver chip is divided into separate digital module and analog module sections with clear spatial separation. The digital module contains digital signal processing circuits while the analog module contains the reference voltage source and Gamma voltage generation circuit. This segmentation reduces coupling between modules and minimizes noise interference from digital signals to analog circuits.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A decoupling capacitor is introduced as an intermediary element between the digital module and the reference voltage source. The decoupling capacitor filters out high-frequency noise and voltage fluctuations from the digital module before they can affect the analog module, acting as a mediator that isolates the two modules while maintaining their functional connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If no decoupling capacitor is used, then device complexity is reduced, but noise interference and display quality deteriorate

Engineering Contradiction:

Improvecircuit complexityVSAvoidnoise interference

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

A decoupling capacitor is introduced as an intermediary element between the digital module and the reference voltage source. The decoupling capacitor filters out high-frequency noise and voltage fluctuations from the digital module before they can affect the analog module, acting as a mediator that isolates the two modules while maintaining their functional connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The decoupling capacitor changes the electrical parameters of the circuit by providing a low-impedance path to ground for high-frequency noise signals. This parameter change allows the circuit to maintain stability and filter noise without fundamentally altering the overall circuit architecture or requiring complex filtering networks.

Inventive Principle:

Principle #35Parameter changes

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

The decoupling capacitor effectively reduces noise interference, stabilizes data voltages, and enhances display quality by minimizing the Moire pattern phenomenon, particularly for low-grayscale displays.

Implementation Method 1

a decoupling capacitor connected between the digital module and the reference voltage source

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11776455B2Driving chip and display apparatus

Publication Date: 2023.10.03 KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD

AI summary

Provided are a driver chip and a display apparatus. The driver chip includes a digital module, an analog module, and a decoupling capacitor. The digital module is configured to generate a digital signal. The analog module includes a reference voltage source and a Gamma voltage generation circuit, an output terminal of the reference voltage source is electrically connected to an input terminal of the Gamma voltage generation circuit, and the Gamma voltage generation circuit is configured to generate a Gamma voltage according to a reference voltage outputted by the reference voltage source. The decoupling capacitor is connected between the digital module and the output terminal of the reference voltage source.