Self-Luminous Display Touch Input via Temperature Detection
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Solution Overview
Problem
Existing image display devices with self-luminous elements face challenges in integrating input functions, such as touch panels, without degrading display quality, increasing power consumption, or shortening the device's lifespan, especially when additional sensors are required in the display area.
Innovation Solution
An image display device with independently controlled power sources for display and detection, a switch to connect these sources, a circuit to control the switch, and a system to read and generate coordinates based on temperature characteristics of self-luminous elements, allowing for input functionality without adding new devices to the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is laminated on the surface of the display device to provide input function, then input functionality is achieved, but display quality degrades and cost increases
Solution Approach 1:
The patent merges the display element and sensor functions into a single integrated structure. The self-luminous display element serves dual purposes: displaying images and sensing touch input through temperature characteristic changes, eliminating the need for separate touch panel layers
Solution Approach 2:
The display element is designed to perform multiple functions simultaneously - it acts as both the light-emitting display component and the temperature-sensitive sensor for touch detection, achieving multi-functionality without adding separate components
2Adaptability or versatility
If photodiode is formed on glass board in display area to provide input function, then input functionality is achieved, but transmission factor is lowered
Solution Approach 1:
The display element itself serves as the sensing element by detecting temperature changes caused by touch. This self-service approach eliminates the need for additional photodiodes or sensors that would block light transmission
3Adaptability or versatility
If additional sensor is added in display area to provide input function, then input functionality is achieved, but power consumption increases and life is lowered
Solution Approach 1:
The display element autonomously detects touch input through its inherent temperature response characteristics without requiring additional active sensing components, thereby avoiding increased power consumption
Solution Approach 2:
The invention recovers and utilizes the temperature characteristic changes that naturally occur in the display element during normal operation, converting this passive physical response into useful touch sensing information without additional energy expenditure
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
Enables the integration of input functions in image display devices while maintaining aperture ratio, reducing power consumption, and extending the device's lifespan by detecting temperature characteristics of self-luminous elements.
Implementation Method 1
The self-luminous element typified by the EL element, organic EL element, etc. has a property such that a luminance of the element is proportional to a current amount flown into the self-luminous element
Implementation Method 2
a temperature characteristic of a self-luminous element used for a display is measured to be able to detect coordinates of the self-luminous element that occurs a characteristic variation
Data Source
AI summary
An image display device includes switches directly connected a constant current source to a self-luminous element to be able to detect a characteristic of the self-luminous element, generate a coordinates and convert information of the characteristic and coordinates into a system communication signal, transferring an input with a temperature variation to a system side.