Liquid Crystal Display Data Line Merging for Sensing
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Solution Overview
Problem
The aperture ratio of liquid crystal displays with sensing mechanisms is reduced due to the arrangement of readout lines, which interferes with data signals, degrading image quality by causing analog voltage drift.
Innovation Solution
The implementation of a liquid crystal display structure that uses data lines to deliver both data and readout signals, with a switch unit connecting either the source driver or readout signal processing unit to the data line, allowing for non-overlapping intervals for signal processing and reducing the need for readout lines, thereby maintaining high aperture ratio and preventing signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If readout lines are arranged to enable sensing operations, then sensing functionality is achieved, but aperture ratio is lowered and data signal interference occurs
Solution Approach 1:
The patent merges the readout line function into the data line by using the same physical line to carry both data signals and readout signals sequentially. The switch unit controls the connection between the sensing unit and data line during sensing operations, eliminating the need for separate readout lines and thereby maintaining aperture ratio while preserving sensing functionality.
Solution Approach 2:
The data line is designed to serve multiple functions: it acts as both a data transmission line for writing data to pixel units and as a readout line for reading signals from sensing units. This multi-functionality eliminates the need for dedicated readout lines, resolving the contradiction between enabling sensing operations and maintaining aperture ratio.
2Adaptability or versatility
If readout lines are arranged to enable sensing operations, then sensing functionality is achieved, but data signal interference increases causing analog voltage drift
Solution Approach 1:
The patent implements periodic action by sequentially switching between data writing mode and sensing mode on the same data line. During data writing, the data line carries data signals from the source driver to pixel units. During sensing operations, the switch unit redirects the data line to connect to the sensing unit for reading readout signals. This time-division multiplexing eliminates simultaneous transmission of data and readout signals, preventing interference and analog voltage drift.
Solution Approach 2:
The switch unit acts as an intermediary device that controls the connection between the data line and different circuit components based on operational mode. During data writing, it connects the data line to the source driver; during sensing, it connects the data line to the sensing unit. This intermediary control mechanism prevents direct interference between data signals and readout signals while maintaining sensing functionality.
3Adaptability or versatility
If separate readout lines are used for sensing operations, then sensing functionality is achieved, but device complexity increases
Solution Approach 1:
The patent merges the readout line function into the data line by using the same physical line to carry both data signals and readout signals sequentially. The switch unit controls the connection between the sensing unit and data line during sensing operations, eliminating the need for separate readout lines and thereby maintaining aperture ratio while preserving sensing functionality.
Data Source
AI summary
A liquid crystal display with sensing mechanism includes a data line, a sensing unit, a pixel unit, a first gate line, a second gate line, a source driver, a readout signal processing unit and a switch unit. The data line is used to deliver a data signal or a readout signal. The sensing unit is employed to generate the readout signal. The pixel unit functions to control pixel brightness according to the data signal. The first gate line delivers a first gate signal for controlling the sensing unit. The second gate line delivers a second gate signal for controlling the pixel unit. The source driver is utilized for providing the data signal. The readout signal processing unit performs a sensing position analysis on the readout signal received. The switch unit is put in use for connecting the data line with either the source driver or the readout signal processing unit.