Pixel Inspection Transistor Voltage Control for Power Reduction

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Solution Overview

Problem

The ASL inspection system for display devices consumes a large amount of electric power due to the need for high voltage to control switching elements for pixel inspection.

Innovation Solution

A method and device that control the voltage applied to gate electrodes of inspection transistors using both a switching signal and an inspection data signal, reducing the voltage required for transistor control and thus lowering power consumption during pixel inspection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a high voltage switching signal is applied to control the inspection transistor in the ASL inspection system, then the pixel inspection can be performed, but the electric power consumption increases significantly

Engineering Contradiction:

Improvepixel inspection capabilityVSAvoidelectric power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the voltage parameter of the switching signal from high voltage (20-30V) to low voltage by utilizing the inspection data signal itself to control the inspection transistor. This parameter change resolves the contradiction by enabling pixel inspection while significantly reducing electric power consumption.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The inspection data signal serves a dual function: it provides the inspection data and simultaneously acts as the switching signal to control the inspection transistor. This self-service approach eliminates the need for a separate high-voltage switching signal, thereby reducing power consumption while maintaining inspection capability.

Inventive Principle:

Principle #25Self-service

2Ease of operation

If a separate high voltage switching signal line is provided for each pixel signal line, then the inspection transistor can be controlled, but the device complexity and power consumption increase

Engineering Contradiction:

Improvetransistor control capabilityVSAvoidsignal line structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The inspection data signal line is given multiple functions: it transmits the inspection data signal and simultaneously serves as the switching signal line to control the inspection transistor. This multi-functionality reduces device complexity by eliminating separate switching signal lines while maintaining full control capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the switching signal function and the data signal transmission function into a single inspection data signal line. This combination reduces the number of signal lines and simplifies the overall device structure while preserving the ability to control inspection transistors effectively.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10885820B2Pixel inspection method, pixel inspection device, and display device

Publication Date: 2021.01.05 SHARP KK

AI summary

Provided is a method of inspecting pixels. The method includes the step of applying a switching signal to gate electrodes of inspection transistors and the step of applying an inspection data signal to one or more of source electrodes of the inspection transistors. A voltage applied to the gate electrodes is controlled under the switching signal and the inspection data signal.