Touch Screen Display Apparatus Narrow Frame Circuit
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Solution Overview
Problem
Mutual-capacitive touch screens face challenges with increasing pixel density, leading to a complex and bulky circuit due to numerous lead lines and preamplifiers, making it difficult to implement a narrow frame and efficient signal detection.
Innovation Solution
The touch screen display apparatus incorporates a touch structure with driving lines arranged in columns and sensing lines in rows, utilizing shift registers and selection switches to reduce the number of lead lines and preamplifiers, allowing for a more compact design and efficient signal amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel density is increased, then the touch screen resolution is improved, but the number of lead lines and preamplifiers increases making the circuit more complex and bulky
Solution Approach 1:
Multiple sensing lines are merged into a single preamplifier through the shift register system. The patent combines N sensing lines that would otherwise require N separate preamplifiers into one shared preamplifier, with the shift register sequentially connecting each sensing line to the preamplifier. This merging reduces the number of preamplifiers from N to 1, significantly simplifying the circuit while maintaining the ability to detect signals from all sensing lines.
Solution Approach 2:
The patent segments the signal processing function by introducing a shift register that sequentially processes signals from multiple sensing lines. Instead of having all sensing lines connected to preamplifiers simultaneously, the shift register divides the processing into time segments, connecting one sensing line to the preamplifier at a time in sequence. This segmentation allows high-resolution sensing with fewer physical preamplifier components.
2Length of stationary object
If the number of lead lines is reduced, then the frame width is narrowed, but the signal detection capability must be maintained
Solution Approach 1:
The patent transitions from a spatial arrangement where each sensing line requires a separate preamplifier connection, to a temporal arrangement using a shift register. By adding the time dimension through sequential switching, the system reduces the spatial requirement for lead lines and preamplifiers. The shift register enables one preamplifier to service multiple sensing lines over time, reducing the perimeter lead line count while maintaining full signal detection capability across all sensing lines.
3Power
If multiple preamplifiers are used for each sensing line, then the signal amplification is sufficient, but the circuit structure becomes bulky
Solution Approach 1:
The patent merges the function of multiple preamplifiers into a single preamplifier by using a shift register to sequentially connect different sensing lines to the same preamplifier. Instead of having N preamplifiers for N sensing lines, the system uses 1 preamplifier that is time-multiplexed across all N sensing lines through the shift register's sequential switching action. This merging reduces the circuit volume significantly while maintaining adequate signal amplification for each sensing line during its active time slot.
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 configuration reduces the number of lead lines on the perimeter, enabling a narrower frame and improving the structural simplicity and efficiency of the touch screen, while maintaining effective signal detection and amplification.
Implementation Method 1
a frequency outputter, and a first shift register The frequency outputter is configured to output a driving signal at a predetermined frequency
Implementation Method 2
the preamplifier is configured to output an amplified sensing signal based on the sensing signal from the second shift register
Data Source
AI summary
The present invention provides a touch screen display apparatus including a touch structure. The touch structure includes multiple driving lines arranged in a column direction, multiple sensing lines arranged in a row direction, a preamplifier, a frequency outputter, a first shift register, and a second shift register. The first shift register is arranged between the driving lines and the frequency outputter, and the second shift register is arranged at output ends of the sensing lines. Each driving line outputs a driving signal and each sensing line outputs a sensing signal for the preamplifier. Accordingly, a single preamplifier may be used.