Pixel-Driving Circuit Reducing Digital-to-Analog Converter Count

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Solution Overview

Problem

The existing pixel driving circuits require a large number of digital-to-analog converters, leading to increased cost and power consumption due to the need for multiple converters to provide positive and negative gray level voltages to main and sub regions, which complicates the data driving circuit and increases inconvenience.

Innovation Solution

A pixel driving circuit with a data driving circuit that uses a reduced number of digital-to-analog converters by employing a selecting circuit to distribute gray level voltages correctly across main and sub regions, utilizing a combination of digital-to-analog converters and selecting circuits to manage polarity and gamma voltage signals efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple digital-to-analog converters are used to provide positive and negative gray level voltages to main and sub regions, then the voltage distribution capability is improved, but the device complexity and power consumption increase significantly

Engineering Contradiction:

Improvevoltage distribution capabilityVSAvoidnumber of digital-to-analog converters

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent makes a single digital-to-analog converter perform multiple functions by using it to generate both positive and negative gray level voltages for both main and sub regions through selective connection control, eliminating the need for separate converters for each voltage type and region

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces selecting circuits as intermediary components that act as smart switches to route the output from a single digital-to-analog converter to different regions (main or sub regions) and to generate both positive and negative voltage variants, thereby mediating between the limited converter resource and the multiple voltage requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple digital-to-analog converters are used to provide positive and negative gray level voltages, then the voltage distribution capability is improved, but the power consumption increases

Engineering Contradiction:

Improvevoltage distribution capabilityVSAvoidpower consumption of data driving circuit

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by stationary object

Solution Approach 1:

A single digital-to-analog converter is designed to serve multiple purposes by generating both positive and negative gray level voltages for multiple regions through controlled switching, thereby reducing the total number of converters and their associated power consumption

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Selecting circuits serve as power-efficient intermediaries that enable one digital-to-analog converter to supply multiple voltage requirements without requiring multiple high-power converters, thus reducing overall power consumption while maintaining voltage distribution capability

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If a single digital-to-analog converter is used with selecting circuits, then the device complexity is reduced, but the ease of operation may be affected

Engineering Contradiction:

Improvenumber of digital-to-analog convertersVSAvoidcontrol complexity of voltage distribution

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

Selecting circuits are designed as automated intermediary components that handle the complexity of voltage routing and polarity control, shielding the upper-level control logic from complexity while providing simple control interfaces for voltage distribution to different regions

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The selecting circuits are configured to automatically and correctly distribute voltages to appropriate regions based on control signals, making the system self-managing in terms of voltage routing decisions and reducing the operational burden on external control systems

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS8872865B2Pixel-driving circuit

Publication Date: 2014.10.28 AU OPTRONICS CORP

AI summary

A pixel driving circuit includes a first pixel, a second pixel, and a data driving circuit. Each pixel includes a main region and a sub region. The main region stores a gray level voltage and the sub region stores a gray level voltage corresponding to the gray level voltage stored in the main region when the main region and the sub region display image. In the data driving circuit, first, second, third, and fourth gray level voltages are generated by means of a first selecting circuit outputting first digital data corresponding to the first pixel and second digital data corresponding to the second pixel to the corresponding digital-to-analog converters. The first, second, third, and fourth gray level voltages are distributed to the main and sub regions of the first and second pixels by a second selecting circuit, thereby reducing the number of digital-to-analog converters.