Pixel Circuit Control Circuit for Precise Luminance Adjustment

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Solution Overview

Problem

Existing control circuits for flat panel displays face challenges in accurately controlling the luminance of pixel circuits due to the non-linear relationship between data signals and light intensity, making it difficult to achieve precise brightness control.

Innovation Solution

A control circuit comprising multiple driving circuits with power supply and reset switch units connected to data lines and pixel circuits, which are activated by specific signals to charge and reset the pixel circuits, allowing for precise control of illumination through voltage strength and timing, similar to a PWM signal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the multiplexer alternately receives operating voltages of different polarities to charge each pixel, then the display quality is improved, but the control circuit complexity increases

Engineering Contradiction:

Improvedisplay qualityVSAvoidcontrol circuit complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The control circuit is divided into multiple driving circuits, each responsible for a specific pixel circuit. Each driving circuit includes independent power supply switch units and reset switch units, allowing parallel control of multiple pixels without increasing overall circuit complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The multiplexer alternately receives operating voltages of different polarities in periodic cycles, sequentially charging each pixel circuit. This periodic switching enables precise brightness control while maintaining a relatively simple control structure through time-multiplexed operation.

Inventive Principle:

Principle #19Periodic action

2Ease of operation

If the power supply switch unit turns on to charge the pixel circuit by data voltage, then the luminance controllability is improved, but the switching timing precision requirements increase

Engineering Contradiction:

Improveluminance controllabilityVSAvoidswitching timing precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The power supply switch unit is turned on at a predetermined timing before the data voltage is fully established, allowing the pixel circuit to be charged during the data voltage establishment period. This preliminary action ensures accurate luminance control without requiring extremely precise switching timing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The driving circuit acts as an intermediary between the multiplexer and the pixel circuit, buffering the timing requirements. It receives control signals from the multiplexer and translates them into precise switching operations for the power supply and reset switch units, isolating the timing precision requirements from the main control circuit.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If the reset switch unit turns on to reset the pixel circuit voltage, then the brightness accuracy is improved, but the reset timing control complexity increases

Engineering Contradiction:

Improvebrightness accuracyVSAvoidreset timing control complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The reset switch unit operates in periodic cycles, turning on at predetermined intervals to reset pixel circuit voltages. This periodic reset operation ensures consistent brightness accuracy across all pixels while simplifying control through regular timing patterns.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The reset switch unit is turned on at a predetermined timing after the power supply switch unit has charged the pixel circuit. This preliminary reset action ensures that pixels are properly initialized before the next charging cycle, maintaining brightness accuracy without requiring complex real-time timing adjustments.

Inventive Principle:

Principle #10Preliminary action

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

This solution enhances the controllability of pixel circuit luminance, enabling accurate adjustment of light intensity by managing the duration and intensity of data voltage application and reset signals, thereby improving display quality.

Implementation Method 1

the power supply switch unit is turned on according to a power supply signal so that the pixel circuit is charged by the data voltage

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

the reset switch unit is turned on according to a reset signal to reset a voltage of the pixel circuit to the reset voltage

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS10810933B1Control circuit for driving pixel circuit

Publication Date: 2020.10.20 AU OPTRONICS CORP

AI summary

A control circuit includes a power supply switch unit and a reset switch unit. The power supply switch unit is electrically connected to a data line and a pixel circuit. When the data line has a data voltage, the power supply switch unit is turned on according to a power supply signal, so that the pixel circuit is charged by the data voltage. The reset switch unit is electrically connected to the pixel circuit. After the pixel circuit is charged by the data voltage, the reset switch unit is turned on according to the reset signal to reset a voltage of the pixel circuit to the reset voltage.