Integrated LCD Touch Screen Common Electrode Driver
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration of a touch screen panel with a liquid crystal display (LCD) requires separate processes and adhesive layers, increasing processing time and cost, and adding thickness to the display.
Innovation Solution
An LCD with an integrated mutual capacitive touch screen panel, where the common electrode serves as both a driving electrode for the LCD and the touch screen panel, allowing for increased touch sensitivity without degrading image quality by using a common electrode driver to supply driving signals and a gate driver to supply gate signals alternately, with the common electrode patterns and gate lines divided into groups for efficient signal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch screen panel is attached to an outer surface of a conventional flat panel display, then touch screen functionality is achieved, but processing time and cost increase due to separate processes and adhesive layers
Solution Approach 1:
The patent combines the touch screen panel with the LCD panel into a single integrated structure. The common electrode of the LCD serves dual purposes: as the common electrode for liquid crystal control and as the driving electrode for the capacitive touch screen. This merging eliminates the need for separate touch screen panels and adhesive layers, thereby reducing processing time and cost while maintaining touch functionality.
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously. It acts as the common electrode for the LCD display function and as the driving electrode for the touch screen function. This multi-functionality eliminates the need for separate dedicated touch electrode structures, simplifying the overall device structure and reducing manufacturing complexity.
2Adaptability or versatility
If a touch screen panel is attached to an outer surface of a conventional flat panel display, then touch screen functionality is achieved, but overall thickness of the flat panel display increases
Solution Approach 1:
The touch screen panel is merged with the LCD panel structure rather than being attached as a separate external component. By integrating the touch electrode layers within the existing LCD panel architecture, the patent eliminates additional thickness from separate panels and adhesive layers, achieving a thinner overall display while maintaining both display and touch functions.
Solution Approach 2:
The common electrode structure serves dual purposes, eliminating the need for separate dedicated touch electrode layers that would add thickness. This multi-functional design allows the same structural element to fulfill both LCD operation and touch sensing requirements, thereby avoiding additional thickness accumulation.
3Adaptability or versatility
If separate processes are used to form the touch screen panel, then touch screen functionality is achieved, but device complexity increases
Solution Approach 1:
The patent merges the formation of the LCD common electrode and the touch screen driving electrode into a single manufacturing process step. By designing the common electrode to serve both functions, the patent eliminates separate process steps for creating dedicated touch electrodes, thereby reducing device complexity and manufacturing complexity simultaneously.
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 processing time and cost, decreases the thickness of the LCD, and enhances touch sensitivity without compromising image quality.
Implementation Method 1
the capacitive touch screen panel converts a contact position into an electrical signal by sensing a change in capacitance formed between a conductive sensing pattern and an adjacent sensing pattern, ground electrode or the like
Data Source
AI summary
A liquid crystal display (LCD) with an integrated touch screen panel includes a plurality of pixels connected to a plurality of data lines and a plurality of gate lines, the gate lines being divided into a plurality of groups, a plurality of sensing electrodes, a plurality of common electrodes divided into a plurality of groups, a common electrode driver configured to simultaneously supply a driving signal to common electrodes within each group of the plurality of groups of the common electrodes, and to sequentially supply the driving signal to the plurality of groups of the common electrodes, and a gate driver configured to sequentially supply a gate signal to gate lines within each of the plurality of group of the gate lines.