Transflective Pixel Structure Contact Opening

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Solution Overview

Problem

Conventional transflective LCD pixel structures face challenges in maintaining sufficient transmittance and superior electrical properties due to the insertion of memory devices in the reflective region, which reduces utilizable space and leads to high contact resistance between the transparent and reflective electrodes.

Innovation Solution

The pixel structure incorporates a contact opening in the transmittance region, allowing the reflective electrode pattern to extend onto the covering layer, enabling better electrical connection between the transparent and reflective electrodes, thus maintaining sufficient transmittance and electrical properties even when the reflective region lacks utilizable space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If memory devices are inserted into the reflective region to lower power consumption, then power consumption is reduced, but the utilizable space in the reflective region is reduced and transmittance may be compromised

Engineering Contradiction:

Improvepower consumptionVSAvoidutilizable space in reflective region

Core Design Contradiction:

Use of energy by moving objectVSArea of stationary object

Solution Approach 1:

The contact opening is moved from the reflective region to the transmittance region, utilizing space in a different dimensional location. This allows memory devices to be disposed in the reflective region without interfering with the electrical connection between transparent and reflective electrodes, as the connection path now extends through the covering layer in the transmittance region.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Use of energy by moving object

If memory devices are inserted into the reflective region, then power consumption is reduced, but contact resistance between transparent and reflective electrodes increases

Engineering Contradiction:

Improvepower consumptionVSAvoidelectrical connection quality

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The electrical connection path is relocated to a different spatial dimension by extending through the covering layer via a contact opening in the transmittance region. This separates the electrical connection function from the memory device placement, allowing both to coexist without interference and maintaining low contact resistance.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The pixel structure is segmented into distinct functional regions: the transmittance region handles electrical connections through the covering layer, while the reflective region accommodates memory devices. This segmentation allows each region to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

3Area of stationary object

If devices are disposed in the transmittance region to compensate for reduced reflective region space, then space utilization is improved, but transmittance and electrical properties may be compromised

Engineering Contradiction:

Improvespace utilizationVSAvoidtransmittance and electrical property

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The transmittance region serves multiple functions: it allows light transmission for display purposes and provides a pathway for electrical connections between transparent and reflective electrodes through the covering layer. This multi-functionality eliminates the need to compromise transmittance or electrical properties for space utilization.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8488088B2Transflective pixel structure

Publication Date: 2013.07.16 AU OPTRONICS CORP

AI summary

A transflective pixel structure including a reflective region and a transmittance region is provided. The pixel structure includes an active device, a covering layer, a reflective electrode layer, a reflective electrode pattern and a transparent electrode layer. The covering layer is disposed in the reflective region and the transmittance region and covers the active device, where the covering layer has a contact opening at least disposed in the transmittance region. The reflective electrode layer is disposed in the reflective region. The reflective electrode pattern is disposed within the contact opening and extends onto a top surface of the covering layer surrounding the contact opening. The transparent electrode layer is disposed on a surface of the covering layer in the transmittance region. The transparent electrode layer is electrically connected to the reflective electrode layer and the transparent electrode layer is electrically connected to the active device through the contact opening.