Foldable Display Capacitive Angle Sensing for Color Cast Correction

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Solution Overview

Problem

Existing foldable display devices face challenges in accurately monitoring bending angles due to the lack of real-time monitoring means, leading to issues like color cast and poor consumer experience, as traditional angle sensors are bulky and require high voltage/current, making them unsuitable for thin displays.

Innovation Solution

A foldable display device equipped with a capacitive sensor comprising first and second electrode structures forming a sensing capacitor, connected to a detection circuit that measures capacitance changes to determine the bending angle, allowing for precise angle detection and color deviation correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional angle sensors are used for bending angle monitoring, then angle detection capability is provided, but the device becomes bulky and requires high voltage/current

Engineering Contradiction:

Improvebending angle detectionVSAvoidsensor size and power requirement

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces traditional mechanical angle sensors with a capacitive sensing system. The capacitive sensor uses electrode structures that detect bending angle through capacitance changes, eliminating the need for mechanical components. This substitution reduces device complexity and power requirements while maintaining angle detection capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the detection parameter from mechanical position to electrical capacitance. By measuring capacitance variations between electrode structures as the display bends, the system achieves angle detection through electrical parameter changes rather than mechanical sensing, reducing sensor size and power consumption.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If traditional angle sensors are used, then angle monitoring is enabled, but real-time monitoring accuracy is insufficient leading to color cast issues

Engineering Contradiction:

Improvereal-time monitoring accuracyVSAvoidcolor cast

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the capacitive sensor continuously monitors bending angle and provides real-time data. This feedback enables dynamic adjustment of display parameters to compensate for color cast caused by bending, improving both monitoring accuracy and visual quality.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The electrical capacitive sensing system provides more precise and responsive angle detection compared to mechanical sensors, enabling better real-time monitoring accuracy and more effective color cast compensation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Shape

If the display is made thin and flexible, then flexibility and thinness are improved, but integration of traditional sensors becomes difficult

Engineering Contradiction:

Improvethinness and flexibilityVSAvoidsensor integration

Core Design Contradiction:

ShapeVSDevice complexity

Solution Approach 1:

The patent merges the sensing function directly into the display structure by integrating capacitive electrode structures within the display panel layers. This combination eliminates the need for separate sensor components, making the display thinner and more flexible while maintaining sensing capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The capacitive electrode structures are implemented as thin flexible layers that can be integrated into the flexible display stack. This approach maintains the thin and flexible characteristics of the display while enabling bending angle detection through capacitance changes.

Inventive Principle:

Principle #30Flexible shells and thin films

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

Enables accurate real-time monitoring of bending angles, effectively addressing color cast issues and enhancing user experience by providing precise angle detection and correction, suitable for thin and flexible displays.

Implementation Method 1

the detection circuit is connected to the first electrode structure and the second electrode structure, respectively, and is configured to detect a capacitance value of the sensing capacitor and obtain a bending angle of the foldable display device according to the capacitance value or a capacitance change amount of the sensing capacitor

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12547208B2Foldable display device and driving method therefor

Publication Date: 2026.02.10 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A foldable display device and a method for driving the same are provided. The foldable display device comprises a display panel, at least one capacitive sensor and at least one detection circuit, wherein the display panel comprises at least one bending area configured for bending, the capacitive sensor comprises a first electrode structure and a second electrode structure configured to form a sensing capacitor, and the detection circuit is connected to the first electrode structure and the second electrode structure, respectively, and is configured to detect a capacitance value of the sensing capacitor and obtain a bending angle of the foldable display device according to the capacitance value or a capacitance change amount of the sensing capacitor.