OLED Touch Display Driver Synchronization Signals

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Solution Overview

Problem

The manufacturing cost and thickness of touch display devices increase with the size of the display panel due to the integration of touch devices, which include a substrate, light emitting and receiving elements, and a protective layer, leading to higher costs and weight.

Innovation Solution

Incorporating an organic light emitting diode (OLED) display panel with a driver configured to display a touch position using touch subfields in the frame, where touch scan and data signals are supplied in specific orders to detect vertical and horizontal positions, allowing for efficient touch detection without the need for additional touch devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a touch device is integrated in front of the display panel, then touch functionality is achieved, but manufacturing cost increases

Engineering Contradiction:

Improvetouch functionalityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent combines the touch detection function with the existing display panel structure by using the same substrate and pixel structure for both display and touch sensing. The light emitting elements serve dual purposes: displaying images and detecting touch positions through light shielding. This merging eliminates the need for separate touch device layers, thereby reducing manufacturing cost while maintaining touch functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The display panel pixels are designed to perform multiple functions: they display visual information through light emission and simultaneously detect touch input through light shielding. The same substrate and pixel structure serve both display and touch sensing purposes, making the system universal and reducing overall device complexity and cost.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a touch device is integrated in front of the display panel, then touch functionality is achieved, but thickness increases

Engineering Contradiction:

Improvetouch functionalityVSAvoidthickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

By merging the touch detection function into the display panel structure itself, the patent eliminates the need for additional separate touch device layers. The touch sensing is achieved within the same pixel structure using light shielding, which prevents thickness increase while maintaining touch functionality.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If a touch device is integrated in front of the display panel, then touch functionality is achieved, but weight increases

Engineering Contradiction:

Improvetouch functionalityVSAvoidweight

Core Design Contradiction:

Adaptability or versatilityVSWeight of stationary object

Solution Approach 1:

The patent merges the touch detection function with the display panel structure, using the same substrate and pixel components for both purposes. This integration eliminates the need for separate heavy touch device components, thereby reducing overall device weight while maintaining touch functionality.

Inventive Principle:

Principle #5Merging (Combining)

4Area of stationary object

If display panel size increases, then display area is improved, but manufacturing cost increases

Engineering Contradiction:

Improvedisplay areaVSAvoidmanufacturing cost

Core Design Contradiction:

Area of stationary objectVSEase of manufacture

Solution Approach 1:

The patent implements multi-functionality where each pixel serves both display and touch sensing purposes. This universal design reduces the overall component count and simplifies manufacturing processes, thereby controlling manufacturing costs even as display panel size increases.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

This solution reduces the complexity and cost of touch detection, enabling thinner and lighter touch display devices while maintaining effective touch functionality, as the OLED display panel integrates touch position detection within its structure.

Implementation Method 1

an organic light emitting diode display panel

Methodology Applied

Scientific EffectOrganic light emitting diode: Organic Light-emitting Diode

Implementation Method 2

The light receiving element 130 may receive the light emitted from the light emitting element 120

Methodology Applied

Scientific EffectLight receiving: Photoelectric Effect

Data Source

PatentUS9164610B2Touch display device having a driver to provide a scan synchronization signal and a data synchronization signal

Publication Date: 2015.10.20 LG ELECTRONICS INC

AI summary

A touch display device may include an organic light emitting diode (OLED) display panel that includes scan lines, data lines, and OLED cells, and a driver to display a touch position on a screen (of the OLED display panel) in a frame that includes a touch subfield. The driver may supply at least one scan sync signal to the scan lines and supply at least one data sync signal to the data lines during one frame. The touch subfield may include a vertical touch subfield to detect a vertical position of the touch position and a horizontal touch subfield to detect a horizontal position of the touch position.