Embedded Optical Induction Input Device Signal Conversion
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Solution Overview
Problem
Existing in-cell touch-control panels require additional resistors on the PCB, leading to inefficiency and high costs, as they convert light induction current signals into voltage signals, which are predominantly used for system processing.
Innovation Solution
Transistors are used to replace resistors, allowing for the conversion of induced current signals into induced voltage signals, utilizing existing semiconductor manufacturing processes and equipment, and alternating transistor polarities to balance trapped charges and prevent threshold voltage shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resistors are used to convert light induction current signals into voltage signals, then signal conversion is achieved, but device complexity and cost increase due to additional components on PCB
Solution Approach 1:
The patent merges the signal conversion function into the existing display panel structure by integrating transistors that can operate as both display elements and signal conversion components. This eliminates the need for separate resistor components on the PCB, reducing device complexity while maintaining manufacturing efficiency through the use of existing semiconductor fabrication processes.
Solution Approach 2:
The transistors in the display panel are designed to serve dual purposes: as display switching elements and as signal conversion components. By making the transistors universal, the patent eliminates the need for dedicated resistor components, thereby reducing the number of parts and simplifying the overall device structure without compromising the signal conversion capability.
2Adaptability or versatility
If additional touch-control panels are installed, then touch-control function is added, but device weight and size increase
Solution Approach 1:
The patent combines the touch-control sensing function with the display panel by integrating light sensing circuits and transistors directly into the display structure. This merging eliminates the need for separate touch-control panels, thereby reducing the overall weight and size of the device while maintaining full touch-control functionality.
Solution Approach 2:
The touch-control sensing components are nested within the display panel structure itself. The light sensing circuits and transistors are embedded in the display array, allowing the display panel to serve as both the visual output and the touch sensing input, thus eliminating the need for additional external touch panels and reducing overall device weight.
3Ease of manufacture
If resistors are added onto PCB, then current to voltage conversion is achieved, but manufacturing cost increases
Solution Approach 1:
The patent utilizes the voltage-transfer characteristic parameters of transistors to achieve signal conversion. By controlling the transistor operating state through gate voltage, the transistor can function as a variable resistor or switch, enabling current-to-voltage conversion without requiring physical resistor components. This parameter-based approach reduces manufacturing cost while maintaining signal conversion capability.
Solution Approach 2:
The patent replaces the mechanical/electrical resistor components with a field-based transistor control system. Instead of using passive resistor elements that require physical fabrication and assembly on PCB, the invention uses active transistor devices controlled by electrical signals, thereby reducing component count and manufacturing cost while achieving the same signal conversion function.
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 costs by eliminating the need for additional touch-control panels and resistors, resulting in a lighter, more efficient, and cost-effective embedded optical induction input device with improved signal stability and wider application scope.
Implementation Method 1
a photo sensor embedded in a display panel is used to detect the light intensity distribution on a panel
Implementation Method 2
the conversion circuit is connected to the light sensing circuit and having a first transistor and a second transistor connected together, thus that are turned on and turned off alternatively in converting induced current signals into induced voltage signals
Data Source
AI summary
An embedded optical induction input device and method of implementing the same. Such a device includes a light sensing circuit and a conversion circuit. The light sensing circuit generates an induced current signal based on the variations of the intensity of light irradiation received as caused by a touch-control-position event; and the conversion circuit is connected to the light sensing circuit and receives an induced current derived therefrom. The conversion circuit is provided with a first transistor and a second transistor coupled together, that are driven by a positive and a negative biases having the same period but different phases, thus the induced current signals are converted into induced voltage signals based on the alternative turn-on's and turn-off's of the first transistor and the second transistor.