Display Driving Apparatus Internal Reference Voltage Generation

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Solution Overview

Problem

Existing display systems face increased manufacturing costs and external noise introduction due to the need for an external reference voltage component to correct pixel data, which also complicates system adaptation.

Innovation Solution

A display driving apparatus generates an internal reference voltage and uses it to create reference data, eliminating the need for an external component and reducing noise, while allowing for selection between internal and external reference voltages based on system needs, and enabling sharing of internal reference voltage among drivers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an external reference voltage component is added to provide reference voltage to the driver, then reference data can be generated for correcting pixel data, but manufacturing cost increases

Engineering Contradiction:

Improvepixel data correction accuracyVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The driver generates its own reference voltage internally using a reference voltage generation circuit, eliminating the need for external reference voltage components. This self-service approach allows the driver to produce the reference voltage required for generating reference data that corrects pixel data, thereby reducing manufacturing cost while maintaining correction accuracy

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The reference voltage generation function is merged into the driver chip itself, combining the reference voltage generation circuit with the driver's existing sensing circuit and output circuit. This integration eliminates separate external components and reduces overall system complexity and manufacturing cost

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If an external reference voltage path is introduced to provide reference voltage to the driver, then reference data can be generated for correcting pixel data, but external noise is introduced into the driver

Engineering Contradiction:

Improvepixel data correction accuracyVSAvoidexternal noise

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The reference voltage generation function is extracted from external components and relocated entirely within the driver chip. By taking out the reference voltage generation process from the external environment and placing it inside the driver, the system eliminates the external reference voltage path that introduces noise, while still providing the necessary reference voltage for accurate pixel data correction

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The driver chip itself acts as an intermediary that generates and provides the reference voltage internally, eliminating the need for external reference voltage paths. This internal generation approach uses the driver's own circuits as mediators to produce clean reference voltage without external noise contamination

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If each driver generates its own internal reference voltage, then manufacturing cost is reduced and noise is decreased, but system adaptability is limited

Engineering Contradiction:

Improvemanufacturing costVSAvoidsystem environment adaptation

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The system is designed with dynamic flexibility by providing multiple operational modes: drivers can operate with internally generated reference voltages for cost-effective and low-noise applications, or switch to externally provided reference voltages when system adaptability is required. This dynamic capability allows the system to adjust its reference voltage source based on specific application requirements

Inventive Principle:

Principle #15Dynamics

4Ease of manufacture

If multiple drivers each generate their own internal reference voltage, then manufacturing cost increases, but if one master driver generates reference voltage for slave drivers, then cost is reduced and noise is decreased

Engineering Contradiction:

Improvemanufacturing costVSAvoiddriver configuration complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The master driver's reference voltage generation circuit serves multiple functions: it generates reference voltage for the master driver itself and simultaneously provides reference voltage to slave drivers. This multi-functional approach allows one reference voltage generation circuit to serve the entire driver group, reducing the total number of circuits needed while maintaining system functionality

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11587508B2Display system and display driving apparatus thereof

Publication Date: 2023.02.21 SILICON WORKS CO LTD

AI summary

A display driving apparatus includes an internal reference voltage generation circuit configured to generate and provide an internal reference voltage; a sensing circuit configured to simultaneously sense pixel signals provided from pixels of a display panel and the internal reference voltage, and output a reference voltage sensing signal generated by sensing of the internal reference voltage and pixel sensing signals generated by sensing of the pixel signals; and an output circuit configured to sequentially select the reference voltage sensing signal and the pixel sensing signals, convert the pixel sensing signals into pixel data, convert the reference voltage sensing signal into reference data, and transmits the pixel data and the reference data.