Gate Lead Line Positioning for LCD Image Uniformity

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Solution Overview

Problem

Conventional liquid crystal display devices experience image unevenness due to the placement of gate lead lines between subpixels, resulting in larger intervals between certain subpixels and other image distortion issues.

Innovation Solution

A liquid crystal display device configuration where gate lead lines are positioned to cross spaces between pixels rather than subpixels, ensuring equal intervals between subpixels and maintaining the aperture ratio, with specific electrical connections and line widths to prevent parasitic capacitance and ensure proper signal transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If gate lead line is disposed between subpixels to achieve narrowed frame, then frame area is reduced, but image unevenness is generated due to larger interval between subpixels

Engineering Contradiction:

Improveframe areaVSAvoidimage uniformity

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

The gate lead line is extended in the first direction (parallel to source line) rather than only in the second direction (vertical), changing its dimensional orientation to cross between pixels instead of between subpixels, thereby avoiding image unevenness while achieving narrowed frame

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The gate lead line is divided into multiple sections: a first gate lead line extending in the first direction, and a second gate lead line extending in the second direction, allowing it to navigate around subpixels while maintaining electrical connection

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If gate lead line runs parallel to source line to prevent image unevenness, then subpixel intervals are equalized, but parasitic capacitance may increase

Engineering Contradiction:

Improveimage uniformityVSAvoidparasitic capacitance

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The gate lead line has different line widths in different sections: a first line width when extending in the first direction, and a second line width when extending in the second direction, allowing optimization of parasitic capacitance in different orientations

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The line width parameter of the gate lead line is changed based on its orientation and position to control parasitic capacitance, with different line widths applied in different sections to minimize harmful effects

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10845661B2Liquid crystal display device

Publication Date: 2020.11.24 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

A liquid crystal display device comprises: a plurality of pixels arranged in a first direction and a second direction intersecting the first direction, the plurality of pixels including a first pixel, a second pixel, and a third pixel; a plurality of subpixel electrodes arranged in each of the plurality of pixels in the second direction; a plurality of source lines extending in the first direction and crossing a space between the plurality of subpixel electrodes and a space between the first pixel and the second pixel; a first gate lead line extending in the first direction and crossing a space between the first pixel and the second pixel; and a first gate line extending in the second direction, crossing a space between the first pixel and the third pixel, and is electrically connected to the first gate lead line.