Touch Display Driving Circuit for Low-Power Touch Sensing

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Solution Overview

Problem

Touch display devices with integrated touch panels face issues of increased thickness, reduced light transmission efficiency, and higher production costs due to the need for separate touch panels, and in low power mode, they experience increased power consumption as the micro control unit continuously provides touch sensing control signals to integrated circuits.

Innovation Solution

The implementation of a touch display device architecture where one or more combined integrated circuits generate and provide touch sensing control signals to other integrated circuits, reducing the need for continuous micro control unit intervention and allowing for load-free driving signals, thereby minimizing power consumption and functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a separate touch panel is mounted on the liquid crystal display device, then touch functionality is achieved, but the device thickness increases and light transmission efficiency decreases

Engineering Contradiction:

Improvetouch functionalityVSAvoiddevice thickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent combines the touch panel and liquid crystal display into a single integrated structure where the touch electrode is formed in the same pixel area as the display electrode. This merging eliminates the need for a separate touch panel layer, thereby reducing device thickness while maintaining both display and touch functionalities.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements an in-cell touch structure where the same pixel electrode serves dual purposes: as the display electrode for liquid crystal modulation and as the touch electrode for sensing touch input. This multi-functionality allows a single component to perform both display and touch sensing roles, reducing overall device thickness.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a separate touch panel is mounted on the liquid crystal display device, then touch functionality is achieved, but production cost increases

Engineering Contradiction:

Improvetouch functionalityVSAvoidproduction cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent merges the touch panel and liquid crystal display into a single integrated structure, eliminating the need for separate manufacturing processes for distinct touch and display panels. This integration reduces production complexity and material costs while maintaining both functionalities.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

By designing the pixel electrode to serve both display and touch sensing functions, the patent eliminates the need for separate touch electrode materials and manufacturing steps, thereby reducing production costs while achieving touch functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If the micro control unit continuously provides touch sensing control signals in low power mode, then touch sensing functionality is maintained, but power consumption increases

Engineering Contradiction:

Improvetouch sensing functionalityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic touch sensing operation where the micro control unit provides touch sensing control signals only during designated touch sensing periods rather than continuously. During display periods, the touch sensing function is suspended, allowing the micro control unit to enter low power mode while maintaining touch functionality when needed.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent dynamically switches between display mode and touch sensing mode, where the system alternates between providing display signals and touch sensing control signals. This dynamic operation allows the micro control unit to reduce power consumption by activating touch sensing functions only during specific time periods rather than continuously.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11307698B2Touch display device, driving circuit and driving method thereof

Publication Date: 2022.04.19 LG DISPLAY CO LTD

AI summary

Embodiments of the present disclosure relate to touch display devices, driving circuits, and driving methods, and more specifically, to a touch display device, a driving circuit, and a driving method for enabling the functionality of a micro control unit to be minimized and power consumption to be reduced by allowing one or more combined integrated circuits to generate a touch sensing control signal and provide the generated signal to a plurality of combined integrated circuits. Further, according to embodiments of the present disclosure, touch display devices, driving circuits, and driving methods are provided for enabling power consumption of a touch power integrated circuit to be reduced by using a touch sensing control signal generated by one or more combined integrated circuits as a load-free driving signal.