Timing Controller Integrating Touch Sensing Into Display Panel
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Solution Overview
Problem
Current display devices with touch screen capabilities require a separate touch sensing device or IC, complicating the manufacturing process and increasing costs due to the need for additional components.
Innovation Solution
A timing controller that uses light emitted from self-emission elements in the display panel to sense touch coordinates, allowing for the acquisition of touch coordinates without a separate touch IC or screen panel by time-dividing the frame duration and varying the number of pixels emitting light based on resolution and precision, and enabling random color emission to prevent ghost images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate touch sensing device or IC is used to detect touch coordinates, then touch detection accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the display function and touch sensing function into a single integrated structure. The display panel itself serves as the touch sensing element by utilizing the light emission characteristics of its pixels to detect touch coordinates, eliminating the need for a separate touch sensing device or IC while maintaining detection accuracy
Solution Approach 2:
The display panel is designed to perform multiple functions: it serves as both the light-emitting display element and the touch sensing element. By controlling specific pixels to emit light in response to touch input, the display panel universally handles both visual output and touch detection without requiring additional specialized components
2Reliability
If a separate touch sensing device or IC is used to detect touch coordinates, then touch detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the touch sensing functionality into the existing display panel structure, eliminating the need to manufacture and assemble separate touch sensing devices or ICs. This integration simplifies the manufacturing process and reduces overall production costs while maintaining reliable touch detection capability
Solution Approach 2:
The display panel serves itself by using its own light-emitting pixels to detect touch coordinates. Specific pixels are controlled to emit light when touched, allowing the display panel to perform its own touch sensing function without requiring external sensing components, thereby reducing manufacturing complexity and cost
3Measurement precision
If all pixels emit light continuously for touch detection, then touch coordinate recognition is improved, but image quality degrades due to ghost images
Solution Approach 1:
Instead of having all pixels emit light continuously, the patent applies light emission locally only to specific pixels that are touched or near the touch location. This localized light emission approach maintains accurate touch coordinate recognition while preventing ghost images from forming across the entire display
Solution Approach 2:
The patent uses periodic or intermittent light emission from pixels rather than continuous emission. By controlling pixels to emit light only during specific time periods when touch detection is required, the system achieves accurate touch recognition while minimizing the formation of persistent ghost images
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 simplifies the manufacturing process, reduces costs, and maintains image quality by integrating touch sensing functionality directly into the display panel, eliminating the need for additional hardware and preventing image degradation from continuous specific color emission.
Implementation Method 1
sensing touch coordinates of a pen that comes into contact with a display panel using light emitted from a self-emission element included in a pixel of a display panel
Data Source
AI summary
Disclosed is a timing controller including a coordinate data generation circuit configured to generate X coordinate emission data for acquiring X coordinates and Y coordinate emission data for acquiring Y coordinates, a selection circuit configured to time-divide 1 frame duration to output the X coordinate emission data to a display driving circuit during an X coordinate field and to output the Y coordinate emission data to the display driving circuit during a Y coordinate field, and a control data generation circuit configured to output control data for allowing pixels connected to one data line to emit light in units of 1 data line using the X coordinate emission data during the X coordinate field and allowing pixels connected to one gate line to emit light in units of 1 gate line using the Y coordinate emission data during the Y coordinate field, to the display driving circuit.