Touch Display Apparatus Using Interference Color Filters
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Solution Overview
Problem
There is a challenge in integrating high-performance touch modules into thin and lightweight organic light emitting display devices while maintaining low production complexity and cost, as existing technologies struggle to effectively combine touch functionality with advanced display capabilities.
Innovation Solution
A touch display apparatus comprising a first and second substrate with a light source and touch sensors, where interference color filters are used to detect touch positions by shifting light output colors through thin film interference, allowing for accurate detection in a CIE 1964 color space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional touch modules are integrated into organic light emitting display devices, then touch functionality is achieved, but device thickness and weight increase significantly
Solution Approach 1:
The patent combines the touch sensor function and display function into a single integrated structure. The touch sensor electrode pattern is formed on the same substrate as the organic light emitting display, eliminating the need for separate touch module layers. This merging approach achieves touch functionality while maintaining the thin and lightweight characteristics of the original display device.
Solution Approach 2:
The patent creates a multi-functional structure where the same layered components serve both display and touch sensing purposes. The organic light emitting display layers simultaneously function as the display structure and the touch sensor electrode structure, enabling one component to perform multiple functions and thereby avoiding additional weight from separate touch modules.
2Adaptability or versatility
If traditional touch modules are integrated into organic light emitting display devices, then touch functionality is achieved, but production complexity and cost increase
Solution Approach 1:
The patent merges the touch sensor fabrication process with the existing display fabrication process. Both structures are formed using the same sequence of coating, patterning, and drying steps on the same substrate, eliminating the need for separate production lines or additional complex manufacturing equipment, thereby reducing production complexity and cost.
Solution Approach 2:
The patent employs universal manufacturing processes where the same materials and fabrication techniques used for the display are also used for the touch sensor. This multi-functional approach allows a single production line to manufacture both components simultaneously, reducing overall production complexity and avoiding the need for specialized touch module manufacturing equipment.
3Measurement precision
If interference color filters are used for touch detection, then detection precision is improved, but light output intensity may be affected
Solution Approach 1:
The patent utilizes interference color filters that change their optical properties based on touch-induced deformation. When the flexible substrate deforms due to touch, the interference color filter's reflected color changes, providing a detectable signal. This color change mechanism enables precise touch detection while the filters are designed to minimize impact on the overall light output intensity of the display.
Solution Approach 2:
The patent employs interference color filters with specific optical parameters designed to balance detection precision and light output. The filters are engineered with particular thickness and refractive index values that optimize the color shift response to touch deformation while maintaining sufficient light transmission and output intensity for normal display operation.
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 accurate and efficient detection of touch positions with high precision, effectively integrating touch functionality into thin and lightweight organic light emitting display devices, enhancing user interaction while maintaining low production complexity and cost.
Implementation Method 1
interference color filters are used to detect touch positions by shifting light output colors through thin film interference
Data Source
AI summary
The present disclosure relates to the field of touch display technology, and in particular, provides a touch display apparatus and a driving method therefor. Specifically, the touch display apparatus includes a first substrate and a second substrate opposite to each other, a light source on a side of the second substrate facing the first substrate, a plurality of touch sensors in an array on a side of the first substrate facing the second substrate, and one or more interference color filters on a side of each touch sensor facing the second substrate. Specifically, the light source is configured to emit light towards each interference color filter. Further, each interference color filter comprises a first sub-interference color filter, a second sub-interference color filter and a third sub-interference color filter configured to output different colors of light respectively.