Integrated Digitizer Sensor Board on LCD Substrate
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Solution Overview
Problem
Conventional display systems with digitizers have increased costs, thickness, and weight due to separate components like a digitizer sensor board, reflector, shield film, and back frame, which require differential interfaces with the LCD module and external host system.
Innovation Solution
Integration of a digitizer sensor board on the LCD module's substrate, along with a shield film laminate and a DC/DC converter, to reduce thickness and weight, and a fabrication method where a digitizer sensor board is formed on a glass substrate with a TFT array on a lower substrate, assembled with an upper substrate to create a display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a digitizer sensor board, reflector, shield film and back frame are used as separate components with differential interfaces, then the display system can achieve proper sensor functionality and noise shielding, but the thickness, weight and cost increase
Solution Approach 1:
The patent integrates the digitizer sensor board with the LCD module by forming the sensor board on the glass substrate of the LCD module. This merging of previously separate components (digitizer sensor board and LCD module) directly reduces the overall weight and thickness of the display system while maintaining the sensor's functional reliability through proper integration of sensing elements and circuitry.
Solution Approach 2:
The integrated display system combines multiple functions into a single structure: the glass substrate serves as both the LCD module component and the digitizer sensor board substrate, the shield film provides both structural support and electromagnetic shielding, and the back frame integrates structural support with mounting functions. This multi-functionality reduces the total component count and associated weight.
2Reliability
If multiple separate components (digitizer sensor board, reflector, shield film, back frame) are assembled, then proper functionality and noise shielding are achieved, but the device complexity and assembly requirements increase
Solution Approach 1:
By forming the digitizer sensor board on the glass substrate of the LCD module, the patent merges two previously separate assembly steps into one integrated structure. This reduces the number of separate components that need to be assembled and reduces assembly complexity while maintaining proper noise shielding through the integrated shield film and back frame structure.
3Reliability
If separate components with differential interfaces are used, then proper signal transmission is achieved, but the cost and number of interfaces increase
Solution Approach 1:
The integration of the digitizer sensor board with the LCD module consolidates the interface requirements. Instead of requiring separate differential interfaces for both the LCD module and digitizer sensor board, the integrated structure shares common interfaces and control signals, reducing the total number of interfaces and associated complexity while maintaining reliable signal transmission through proper signal routing and noise shielding.
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
The integrated display system reduces thickness and weight, provides visual feedback for position pointer or finger contact, and screens external noise, while maintaining functionality for image display and position sensing with a single interface to the host system.
Implementation Method 1
Numbers of technologies can be used for such devices, including capacitive sensing
Implementation Method 2
with a shield film laminate on the display system to screen external noise
Data Source
AI summary
Display devices and methods forming the same. A digitizer sensor board is integrated on an upper substrate or a lower substrate of a display panel to provide a display device. In the display device, the display panel displays images, and the digitizer sensor board is integrated into the display panel to sense position of a position pointer or finger contact on a surface.