Transflective LCD Substrate with Segmented Electrodes

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Solution Overview

Problem

Transflective-type LCD devices face challenges with defects in large-scale display panels due to dust or poor director control, and have uneven power consumption and viewing angle performance across indoor and outdoor environments.

Innovation Solution

A display substrate with a base substrate featuring a transmissive area and a reflective area, including a reflective layer, common electrodes, and pixel electrodes with specific spacing and design to manage cell gaps and electric fields, ensuring uniform phase delay and improved viewing angles while reducing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a multi-cell gap method is employed to achieve uniform phase delay in transflective-type LCD, then phase delay uniformity is improved, but manufacturing complexity and defect risk increase in large-scale display panels

Engineering Contradiction:

Improvephase delay uniformityVSAvoidmulti-cell gap structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The common electrode is divided into a first common electrode in the reflective area and a second common electrode in the transmissive area, allowing independent cell gap control in each region. This segmentation enables uniform phase delay without requiring complex multi-cell gap structures throughout the entire panel, thereby reducing manufacturing complexity while maintaining precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different cell gaps are implemented in different areas: a first cell gap in the reflective area and a second cell gap in the transmissive area. This local quality approach optimizes phase delay uniformity for each specific region's functional requirements without imposing uniform complexity across the entire display panel.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If transmissive-type LCD is used for indoor display, then visibility and color reproducibility are improved, but power consumption increases

Engineering Contradiction:

ImprovevisibilityVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The display panel achieves multi-functionality by incorporating both reflective and transmissive areas within the same pixel structure. The reflective area provides outdoor visibility without backlight power consumption, while the transmissive area delivers indoor visibility with enhanced color reproducibility. This universal design allows the single panel to adapt to different viewing environments without requiring separate display devices.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Use of energy by moving object

If reflective-type LCD is used for outdoor display, then power consumption is reduced, but visibility decreases in dark environments

Engineering Contradiction:

Improvepower consumptionVSAvoidvisibility

Core Design Contradiction:

Use of energy by moving objectVSIllumination intensity

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Device complexity

If uniform cell gap is maintained across the entire display panel, then manufacturing simplicity is improved, but phase delay uniformity deteriorates in transflective-type LCD

Engineering Contradiction:

Improvecell gap structureVSAvoidphase delay uniformity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8625061B2Display substrate, method of manufacturing the display substrate and liquid crystal display device having the display substrate

Publication Date: 2014.01.07 LONESTAR CRYSTAL DISPLAY LLC

AI summary

A display substrate includes a base substrate, a reflective layer, a common electrode and a pixel electrode. The base substrate includes a pixel area having a transmissive area and a reflective area. The reflective layer is disposed in the reflective area of the base substrate. The common electrode includes a first sub-common electrode formed in the reflective area and a second sub-common electrode formed in the transmissive area. The pixel electrode includes a first sub-pixel electrode spaced apart from the first sub-common electrode by a first distance in the reflective area, and a second sub-pixel electrode spaced apart from the second sub-common electrode by a second distance less than the first distance in the transmissive area.