Passive Micro-LED Display Layout With Peripheral Driving Circuits
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Solution Overview
Problem
The development of high-resolution micro-LED display panels is hindered by complex pixel circuits and high production costs due to the current-driven structure of light-emitting diodes, which require a large area for low temperature poly-silicon substrates and complex transistor elements.
Innovation Solution
A passive display apparatus is designed with light-emitting elements arranged in an array, where only the light-emitting elements and traces are retained in the pixel array, and the driving elements are moved to the periphery, simplifying the detection process and reducing the overall area of low-temperature poly-silicon substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current-driven structure with complex pixel circuits is used to drive light-emitting diodes, then the display apparatus achieves reliable light emission and longer service life, but the device complexity increases due to the need for complex transistor elements and capacitor configurations for compensation
Solution Approach 1:
The patent extracts the driving circuitry from the pixel array and places it in the periphery. Specifically, the scanning circuit, scanning switches, and current control circuit are positioned outside the pixel array, leaving only the light-emitting elements and traces within the array. This extraction reduces the complexity within the pixel array while maintaining the current-driven structure's reliability for driving the LEDs.
2Reliability
If complex transistor elements and capacitor configurations are used for compensation and improvement under transistor variation and IR drop, then the display apparatus achieves better performance, but the manufacturing precision requirements increase due to the demand for large area low temperature poly-silicon substrates
Solution Approach 1:
The patent removes the need for complex transistor elements and capacitor configurations within the pixel array by extracting the compensation and control functions to the periphery. The current control circuit in the periphery handles the compensation for transistor variation and IR drop, eliminating the need for large-area LTPS substrates and reducing manufacturing precision requirements.
3Ease of operation
If driving elements are placed within the pixel array, then the light-emitting elements can be driven directly, but the area occupied by non-light-emitting components increases, reducing the resolution of the display panel
Solution Approach 1:
The patent segments the display apparatus into two distinct regions: the pixel array containing only light-emitting elements and traces, and the periphery containing all driving elements (scanning circuit, scanning switches, current control circuit). This segmentation allows the pixel array to be dedicated entirely to light emission, maximizing resolution, while the periphery handles all driving functions.
Solution Approach 2:
The patent moves the driving elements from the two-dimensional plane of the pixel array to the periphery, effectively utilizing the boundary dimension. This dimensional reorganization allows the pixel array to achieve higher resolution by eliminating intra-array driving components, while the periphery accommodates the necessary driving circuitry.
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 improves the resolution of the pixel array and simplifies the detection process, leading to enhanced yield rates and reduced production costs.
Implementation Method 1
the light-emitting elements emit light based on the received light-emitting currents
Data Source
AI summary
Disclosed is a passive display apparatus. The passive display apparatus includes multiple light-emitting elements, a scanning circuit, multiple scanning switches, and a current control circuit. The light emitting elements are arranged in an array. The scanning circuit is coupled to the light-emitting elements and has multiple scan shift registers to generate multiple scan signals enabled sequentially. The scanning switches receive the scan signals and a first operating voltage to provide the first operating voltage to the light-emitting elements row by row. The current control circuit is coupled to the light-emitting elements, and receives multiple pixel voltages to provide multiple light-emitting currents to the light-emitting elements. The light-emitting elements emit light based on the received light-emitting currents.