Touch Display Module Screen-Off Color via Phase Difference

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Solution Overview

Problem

Conventional display devices in a screen-off state display only black, resulting in a single color tone with poor visual effect, failing to meet user needs for aesthetic appeal.

Innovation Solution

A touch display module comprising a display module, a touch module, and a circular polarizer stacked sequentially, where a predetermined included angle between the phase differences generated by ambient light on the substrate and the circular polarizer allows only specific wavelengths to be reflected, enabling the display of predetermined colors in a screen-off state, such as red, green, or blue, by adjusting the phase differences to specific values like 143 nm or 151 nm.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the screen is turned off, then the display device displays black color, but the visual effect is poor and single color tone

Engineering Contradiction:

Improvecolor diversityVSAvoidoptical structure complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent changes the optical parameters of the display module by introducing a circular polarizer with specific phase difference characteristics. By controlling the phase difference between light waves passing through the circular polarizer and substrate, the system achieves color selection in screen-off state without adding complex display hardware.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The circular polarizer acts as an intermediary optical element between the display module and the external environment. It mediates the light transmission properties to achieve color filtering effects, enabling color display in screen-off state through its phase difference characteristics rather than direct display output.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If a circular polarizer is introduced to achieve color display in screen-off state, then color diversity is improved, but the optical structure becomes more complex

Engineering Contradiction:

Improvecolor display capabilityVSAvoidoptical layer stacking

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The circular polarizer is designed to serve multiple functions: it provides color filtering in screen-off state, maintains display functionality in screen-on state, and can be integrated with existing touch module structures. This multi-functionality reduces the need for separate dedicated components for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the circular polarizer with the existing touch module substrate structure, combining multiple optical functions into an integrated assembly. By stacking the circular polarizer and substrate as a unified optical system, the design reduces overall structural complexity compared to separate components.

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 touch display module can display a variety of colors in a screen-off state, enhancing its appearance and meeting user aesthetic needs without affecting its normal display functionality, with wide application range and commercial prospects.

Implementation Method 1

a predetermined included angle exists between a direction of a first phase difference generated by ambient light irradiating the substrate and a direction of a second phase difference generated by the ambient light irradiating the circular polarizer

Methodology Applied

Scientific EffectPhase difference:

Implementation Method 2

a circular polarizer which are sequentially stacked, wherein the touch module includes a substrate

Methodology Applied

Scientific EffectPolarisation: Polarisation

Data Source

PatentUS11474628B2Touch display module, control method thereof and display device

Publication Date: 2022.10.18 BEIJING BOE TECH DEV CO LTD

AI summary

A touch display module, a display device and a method for controlling the touch display module to display a predetermined color in a screen-off state are provided. The touch display module includes a display module, a touch module and a circular polarizer which are sequentially stacked. The touch module includes a substrate. A predetermined included angle exists between a direction of a first phase difference generated by ambient light irradiating the substrate and a direction of a second phase difference generated by the ambient light irradiating the circular polarizer, the predetermined included angle makes a sum of the first phase difference and the second phase difference a predetermined phase difference. In a screen-off state of the touch display module, when the ambient light enters the touch display module, the predetermined phase difference enables only light with a predetermined color to be reflected from the touch display module.