LCD Detection Unit Reduces Array Masks via Shared Short-Circuit Lines

Solution Overview

Problem

The production of four-color RGBW displays faces issues with excessive short-circuit lines, frequent changes to array masks, and increased production costs due to the need for multiple array mask changes when transitioning from three-color RGB displays.

Innovation Solution

A detection unit for LCDs is designed with a short-circuit line set, lead line set, and signal line set, where the white pixel lead line is connected to the second short-circuit line, allowing shared testing with green pixels, reducing the number of shorting bars and array masks required, and enabling lighting detection of solid white and mixed color screens using three test short-circuit lines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the number of pixel signal lines is increased to four for four-color RGBW displays while keeping the same array mask design as three-color RGB displays, then the display color performance is improved, but the detection capability for solid color screens is lost and only solid white screen detection is possible

Engineering Contradiction:

Improvedisplay color performanceVSAvoiddetection capability

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The second short-circuit line is designed to serve dual functions: it connects to both the green pixel signal line and the white pixel signal line. This allows a single short-circuit line to support detection for both green pixels and white pixels, enabling the detection system to handle both three-color RGB and four-color RGBW display modes without requiring separate detection paths.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The detection unit merges the green pixel detection path and white pixel detection path by connecting both to the same second short-circuit line. This consolidation reduces the number of separate detection channels needed while maintaining the ability to detect both green and white pixel performance, thereby resolving the contradiction between enhanced display capability and detection capability.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If four separate shorting bars are used for four-color RGBW displays (R/G/B/W), then each pixel type can be detected individually, but the number of array masks needs to be increased and production cost increases

Engineering Contradiction:

Improveindividual pixel detectionVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The second short-circuit line is designed to serve dual functions: it connects to both the green pixel signal line and the white pixel signal line. This allows a single short-circuit line to support detection for both green pixels and white pixels, enabling the detection system to handle both three-color RGB and four-color RGBW display modes without requiring separate detection paths.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The detection unit merges the green pixel detection path and white pixel detection path by connecting both to the same second short-circuit line. This consolidation reduces the number of separate detection channels needed while maintaining the ability to detect both green and white pixel performance, thereby resolving the contradiction between enhanced display capability and detection capability.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If the array mask design is changed to accommodate four shorting bars for four-color RGBW displays, then individual detection of all pixel types is possible, but the number of array mask changes increases and production complexity increases

Engineering Contradiction:

Improvepixel detection coverageVSAvoidarray mask changes

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The second short-circuit line is designed to serve dual functions: it connects to both the green pixel signal line and the white pixel signal line. This allows a single short-circuit line to support detection for both green pixels and white pixels, enabling the detection system to handle both three-color RGB and four-color RGBW display modes without requiring separate detection paths.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The detection unit merges the green pixel detection path and white pixel detection path by connecting both to the same second short-circuit line. This consolidation reduces the number of separate detection channels needed while maintaining the ability to detect both green and white pixel performance, thereby resolving the contradiction between enhanced display capability and detection capability.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10067384B2Detection unit, array structure, liquid crystal display device and detection method

Publication Date: 2018.09.04 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

A detection unit for lighting detection of an LCD, an array structure comprising the detection unit, a liquid crystal display comprising the the array structure, and a detection method for lighting detection of an LCD are provided. Processes of original RGB displays are improved, the shorting bars are reduced, and only one array mask is changed to implement the lighting detection of solid colors and mixed colors in semi-products of RGBW displays, and the production cost can be reduced.