Touch Display Panel Dual Common Electrode Segmentation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current touch display panels face challenges in maintaining a narrow viewing angle and display uniformity when switching between display and touch modes, due to voltage differences affecting the display medium arrangement and causing non-uniformity.

Innovation Solution

A touch display panel design with a first and second common electrode, where the second common electrode receives an indication signal with alternating voltage values, maintaining a voltage difference with the first common electrode to ensure the display frame maintains a narrow viewing angle and improves uniformity during touch mode operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the common electrode is provided with a voltage or signal for touch sensing in touch mode, then touch sensing function is achieved, but the display frame cannot maintain a narrow viewing angle and exhibits non-uniformity

Engineering Contradiction:

Improvetouch sensing functionVSAvoiddisplay frame uniformity and viewing angle control

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The common electrode is divided into two separate electrodes: a first common electrode and a second common electrode. This segmentation allows independent voltage control for each electrode, enabling the first common electrode to maintain a voltage difference with the pixel electrode for display uniformity while the second common electrode receives the indication signal for touch sensing without affecting display quality

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The dual common electrode structure enables the display panel to perform multiple functions simultaneously: the first common electrode maintains display frame uniformity through voltage difference control, while the second common electrode provides touch sensing capability through indication signal reception. This multi-functionality resolves the conflict between touch sensing and display quality maintenance

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the display panel uses voltage control to achieve a narrow viewing angle in display mode, then peep-proof function is achieved, but the display frame becomes non-uniform when touch sensing is activated

Engineering Contradiction:

Improvenarrow viewing angle capabilityVSAvoiddisplay frame uniformity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

By segmenting the common electrode into two independent electrodes, the patent enables separate control of display parameters and touch sensing parameters. The first common electrode maintains the voltage difference needed for narrow viewing angle and display uniformity, while the second common electrode handles touch sensing operations without disrupting the display frame uniformity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second common electrode acts as an intermediary that receives the indication signal for touch sensing while the first common electrode maintains the voltage difference for display uniformity. This intermediary structure allows touch sensing to occur without directly affecting the display frame, thus maintaining both narrow viewing angle capability and display uniformity

Inventive Principle:

Principle #24Intermediary (Mediator)

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 maintains a narrow viewing angle and improves display uniformity in touch mode by alternately applying voltage differences between the common electrodes, ensuring the touch display panel's peep-proof function is maintained.

Implementation Method 1

the electric field effect produced by the common electrode may also cause non-uniformity of the display frame

Methodology Applied

Scientific EffectElectric field effect: Electric Field

Implementation Method 2

the arrangement of the display medium layer varies according to the data signal and the first voltage difference

Methodology Applied

Scientific EffectLiquid crystal arrangement control: Liquid Crystals

Data Source

PatentUS10234972B2Touch display panel alternately executing a display mode and a touch mode and control method thereof

Publication Date: 2019.03.19 AU OPTRONICS CORP

AI summary

A touch display panel and controlling method thereof are provided. The touch display panel includes a first substrate, a second substrate, a display medium layer, a first common electrode, and a pixel structure including a pixel electrode and a second common electrode. The first common electrode has a voltage signal. In a display mode, the pixel electrode is provided with a data signal so that a first voltage difference exists between the first and the second common electrodes. The arrangement of the display medium layer varies according to the data signal and the first voltage difference. In a touch mode, the second common electrode is provided with an indication signal whose waveform alternates between first and second voltage values. When the indication signal is at the first voltage value and a second voltage value respectively, a second and a third voltage differences exist between the first and second common electrodes.