EL Display Coordinate Detection via Optical Reflection Marks
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Solution Overview
Problem
Existing display devices with EL elements struggle to accurately specify coordinates on a display area using electronic pens, as they lack efficient methods for detecting position changes with coordinate detection marks.
Innovation Solution
The information display apparatus incorporates a display panel with EL elements arranged in a matrix, a polarizing plate, and coordinate detection marks that change the direction of incidence light, allowing for easy position specification by detecting light using an image acquisition means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resistance pressure method or electromagnetic induction method is used for coordinate detection, then coordinate input can be achieved, but the method is not efficient with EL display devices and increases device complexity
Solution Approach 1:
The patent replaces resistance pressure method or electromagnetic induction method with optical reflection method. The electronic pen emits light that reflects off the display screen, and the reflected light is detected to determine coordinates. This substitution simplifies the detection mechanism and improves efficiency with EL display devices.
Solution Approach 2:
The patent introduces light as an intermediary between the electronic pen and the display screen for coordinate detection. The light emitted by the pen reflects off the screen and returns to the pen's sensor, serving as a mediator that enables simple and efficient coordinate detection without complex electrical contact mechanisms.
2Measurement precision
If coordinate detection marks are used on printed media, then position specification can be achieved, but the existing methods are not efficient when employing an electronic pen with EL display devices
Solution Approach 1:
The patent replaces traditional coordinate detection methods with optical reflection method. The electronic pen emits light that reflects off the display screen including the coordinate detection marks, and the reflected light pattern is analyzed to precisely determine position. This achieves both high measurement precision and improved productivity with EL display devices.
3Measurement precision
If a polarizing plate is added to the EL display panel, then coordinate detection accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The patent integrates the polarizing plate into the EL display panel structure to serve multiple functions: maintaining the display's optical characteristics and enabling coordinate detection through light reflection. This multi-functionality approach allows the same component to serve both display and detection purposes, minimizing additional complexity.
Solution Approach 2:
The patent merges the polarizing plate function with the existing EL display panel structure. The polarizing plate is integrated into the panel's optical path, combining its polarization function with the display's light emission and the coordinate detection's light reflection requirements, thereby achieving coordinate detection accuracy without significantly increasing overall device complexity.
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 enables precise coordinate detection even when using electronic pens, enhancing the accuracy and efficiency of coordinate input on EL display devices.
Implementation Method 1
The display panel has a polarizing plate polarizing an incidence light
Implementation Method 2
the display panel has a coordinate detection mark which has a characteristic of changing direction of the incidence light
Implementation Method 3
detecting the lights which passed or reflected the coordinate detection mark
Data Source
AI summary
Information display apparatus has a display panel comprising a display area where pixels of EL element are arranged in matrix, a source signal line supplying an image signal to the pixel, and a gate signal line supplying a signal controlling selection or non-selection of luminescence of the pixel. The display panel has a polarizing plate for polarizing an incident light. The display panel comprises a coordinate detection mark having the characteristics of changing the direction of incident light.