Liquid Crystal Panel Common Electrode Layout for Color Shift Compensation

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Solution Overview

Problem

Existing liquid crystal panels face challenges with color shift phenomena at large viewing angles due to the complexity of fabrication and reduced aperture ratio, which increases product costs and affects display quality.

Innovation Solution

A liquid crystal panel design featuring a common electrode layout on the color filter substrate with different insulation layers in each pixel region, creating distinct liquid crystal capacitors that vary transmittance with applied voltage, simplifying fabrication and enhancing aperture ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a compensation capacitor and sharing TFT are added to each pixel unit to solve color shift, then color shift problem is solved, but device complexity and fabrication difficulty increase

Engineering Contradiction:

Improvecolor shiftVSAvoidpixel unit structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent extracts the compensation function from the pixel unit level and implements it at the common electrode level. By creating first and second common electrode regions with different areas, the compensation capacitor function is integrated into the common electrode structure itself, eliminating the need for separate compensation capacitors and sharing TFTs in each pixel unit.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the common electrode into two distinct regions (first common electrode region and second common electrode region) with different areas. This merging of the common electrode function with the compensation function creates a unified structure that simultaneously performs both functions without requiring additional separate components.

Inventive Principle:

Principle #5Merging (Combining)

2Object-affected harmful factors

If a compensation capacitor and sharing TFT are added to each pixel unit to solve color shift, then color shift problem is solved, but aperture ratio decreases

Engineering Contradiction:

Improvecolor shiftVSAvoidaperture ratio

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The patent extracts the compensation function from individual pixel units and relocates it to the common electrode structure. This extraction eliminates the need for additional components within pixel units, thereby preserving the aperture ratio while still achieving color shift compensation through the differential area design of the common electrode regions.

Inventive Principle:

Principle #2Taking out (Extraction)

3Object-affected harmful factors

If a compensation capacitor and sharing TFT are added to each pixel unit to solve color shift, then color shift problem is solved, but manufacturing cost increases

Engineering Contradiction:

Improvecolor shiftVSAvoidfabrication process

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent merges the compensation function into the common electrode structure by creating first and second common electrode regions with different areas. This merging eliminates the need for separate compensation capacitor fabrication processes and sharing TFT fabrication, thereby simplifying the overall manufacturing process and reducing production costs.

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively addresses color shift issues while simplifying the fabrication process and increasing the aperture ratio, thereby improving display quality and reducing costs.

Implementation Method 1

a liquid crystal layer disposed between the TFT substrate and the color filter substrate; multiple pixel electrodes disposed on the TFT substrate; a common electrode disposed on the color filter substrate

Methodology Applied

Scientific EffectLiquid crystal electro-optic effect: Electro-Optic Effects

Implementation Method 2

a first insulation layer disposed on the color filter substrate, located in the first pixel region, and located between the color filter substrate and the common electrode; and a second insulation layer disposed on the color filter substrate, located in the second pixel region

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS9429797B2Liquid crystal panel comprising first and second liquid crystal capacitors and liquid crystal display having the same

Publication Date: 2016.08.30 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

A liquid crystal panel includes multiple pixel units, each pixel unit including a first pixel region and a second pixel region. Besides, the liquid crystal panel comprises a thin-film-transistor (TFT) substrate, a color filter substrate disposed oppositely to the TFT substrate; a liquid crystal layer disposed between the TFT substrate and the color filter substrate; multiple pixel electrodes disposed on the TFT substrate; a common electrode disposed on the color filter substrate; a first insulation layer disposed on the color filter substrate, located in the first pixel region and located between the color filter substrate and the common electrode; and a second insulation layer disposed on the color filter substrate, located in the second pixel region and located above the color filter substrate and the common electrode. The present invention also discloses a liquid crystal display having the above liquid crystal panel.