Integrated Touch Display Micro-iLED Control Circuit
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Solution Overview
Problem
Current touchscreen technologies, particularly multi-touch systems, face limitations in size, scan rate, and modalities due to sequential matrix scanning, which restricts the size of touch sensor arrays and the rate at which touches can be detected.
Innovation Solution
The integration of micro-inorganic-light-emitting-diode (micro-iLED) control circuits with capacitive touch controllers within the display substrate, allowing for simultaneous control of multiple touch sense signals across pixel clusters, enhancing touch sensing capabilities and scan rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential matrix scanning is used to control touch sensors, then device complexity is reduced, but scan rate and touch detection speed deteriorate
Solution Approach 1:
The display area is divided into multiple pixel clusters, each with its own dedicated control circuit. This segmentation allows parallel processing of touch signals from different regions, dramatically increasing the scan rate while keeping each individual control circuit relatively simple.
Solution Approach 2:
The patent transitions from sequential one-dimensional scanning to two-dimensional parallel scanning by activating multiple pixel clusters simultaneously. This dimensional change in the scanning approach enables multiple touch points to be detected at the same time, resolving the speed-complexity contradiction.
2Adaptability or versatility
If the touch sensor array size is increased to detect more touch points, then multi-touch capability is improved, but scan rate deteriorates due to sequential scanning
Solution Approach 1:
By dividing the large touch sensor array into multiple pixel clusters with dedicated control circuits, the system can handle more touch points simultaneously. Each cluster processes touches independently and in parallel, maintaining high scan rates even as the overall array size increases.
Solution Approach 2:
Each pixel cluster control circuit is designed to be universal, capable of handling multiple touch points within its cluster. This multi-functionality allows the system to scale to larger arrays without proportionally increasing complexity, as each control circuit can manage various touch scenarios.
3Adaptability or versatility
If separate substrates and covers are used for touchscreen, then touch functionality is added, but display thickness and weight increase
Solution Approach 1:
The patent merges the touch sensor array and display into a single integrated structure where pixel clusters serve dual purposes as both display elements and touch sensing units. This consolidation eliminates separate touchscreen substrates and covers, reducing overall thickness while maintaining full touch functionality.
Solution Approach 2:
The pixel structures perform multiple functions: they serve as light-emitting display elements and simultaneously as capacitive touch sensors. This multi-functionality allows the display to incorporate touch capability without adding separate components, thereby reducing thickness and weight.
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 approach enables faster and more sensitive touch detection with reduced size and complexity, improving multi-touch functionality and scan rates in flat-panel displays.
Implementation Method 1
a micro-inorganic-light-emitting-diode (micro-iLED) comprising one or more inorganic material layers that emit light when electrical current passes through the one or more inorganic layers
Implementation Method 2
The anode conductor or the cathode conductor is a signal conductor. A signal circuit can be connected to the signal conductor operable to provide or receive a control signal at a frequency of no less than one MHz on the signal conductor
Data Source
AI summary
A display with integrated touch screen includes pixels distributed in an array of rows or pixels connected by row wires and columns of pixels connected by column wires defining a display area on a display substrate. The pixels can comprise mutually exclusive subarrays of pixels forming clusters. Each cluster can be independently controlled and can comprise a touch controller for sensing touches. Each pixel can include one or more micro-iLEDs. A first row wire can be driven with a display signal at the same time the touch controller senses one or more second row wires different from the first row wire. The touch controller can sense multiple row wires at a time or can receive a control signal at a frequency of no less than one MHz on a row wire. In some embodiments, the touch controller comprises a capacitance circuit in an integrated circuit separate from the display substrate.