Mini-LED Pixel Driving Chip Layout for Higher-Resolution Tiled Displays
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Solution Overview
Problem
Mini-LED display products face limitations in resolution enhancement due to the passive matrix driving method, which results in increased power consumption, complexity, and cost, especially when tiling display panels, as they require numerous SPI signals and multiple layers of traces, leading to inefficiencies in power management and design complexity.
Innovation Solution
A pixel unit with N light-emitting devices and a pixel driving chip that includes data, power supply, and signal channel terminals, where light-emitting devices are sequentially connected end-to-end, allowing for direct current control and luminance adjustment through a light-emitting control circuit, reducing the area occupied by the pixel driving chip and enabling higher resolution displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive matrix driving method is used for Mini-LED display, then power consumption is increased, but device complexity is reduced
Solution Approach 1:
The pixel unit is segmented into multiple light-emitting devices (first light-emitting device, second light-emitting device, third light-emitting device) with independent control capabilities. Each light-emitting device has its own control electrode that can be independently driven, allowing selective activation and reduced overall power consumption while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The patent implements dynamic control of light-emitting devices through time-sequential driving methods. The first light-emitting device is driven in a first time period, the second light-emitting device in a second time period, and the third light-emitting device in a third time period. This dynamic temporal separation allows the display to achieve full-color output while consuming power only when needed, reducing average power consumption without requiring complex simultaneous control circuits
2Manufacturing precision
If resolution is enhanced in Mini-LED display, then manufacturing precision is improved, but device complexity is increased
Solution Approach 1:
Each pixel unit is divided into multiple independently controllable light-emitting devices with distinct control electrodes. This segmentation allows for higher resolution displays as each device can be precisely controlled and addressed individually, while the modular structure keeps device complexity manageable through standardized control interfaces and sequential driving methods
Solution Approach 2:
The patent adds a temporal dimension to the control architecture by implementing time-sequential driving. Instead of controlling all light-emitting devices simultaneously (spatial dimension only), the system uses time-multiplexed control where different devices are activated in different time periods. This dimensional transformation reduces the complexity of control circuits while enabling higher resolution through increased degrees of freedom
3Area of moving object
If display panels are tiled, then area of moving object is increased, but device complexity is increased
Solution Approach 1:
The display is segmented into multiple independently controllable pixel units, each with its own set of light-emitting devices and control circuits. This segmentation allows display panels to be tiled together to form larger displays while each tile maintains independent control, preventing exponential growth in overall system complexity. The modular pixel unit architecture enables scalable display areas without proportionally increasing control complexity
Solution Approach 2:
The patent implements a universal control architecture where each pixel unit uses the same structure and control methodology regardless of its position in the display. The control electrodes and driving methods are multi-functional, capable of addressing different light-emitting devices in different time periods. This universality allows tiled displays to maintain consistent control complexity per unit area, preventing overall complexity from scaling linearly with display area
4Adaptability or versatility
If numerous SPI signals are used for tiling, then adaptability is improved, but device complexity is increased
Solution Approach 1:
The patent implements periodic action through time-sequential driving of light-emitting devices. Each light-emitting device is activated in periodic time periods (first time period, second time period, third time period), allowing the same control infrastructure to serve multiple devices through time-multiplexing. This periodic control scheme provides adaptability for tiling configurations without requiring dedicated signals for each light-emitting device, thereby reducing signal complexity while maintaining versatility
Solution Approach 2:
The control system uses dynamic time-sequential addressing to adapt to different tiling configurations. Rather than using static dedicated SPI signals for each light-emitting device, the system dynamically assigns control time periods to different devices based on the tiling configuration. This dynamic approach provides adaptability for various display sizes and arrangements while keeping the signal infrastructure simple and manageable
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 simplifies the pixel driving chip structure, reduces power consumption, and enhances display resolution by directly controlling the current and duration of each light-emitting device, thereby improving the efficiency and cost-effectiveness of Mini-LED display technology.
Implementation Method 1
N light-emitting devices L and a pixel driving chip 2... each light-emitting device L emits light in response to applied current
Data Source
AI summary
A pixel unit includes N light-emitting devices and a pixel driving chip. The pixel driving chip includes: a data signal terminal used to receive a data signal; a power supply signal terminal used to receive a power supply signal; and N signal channel terminals being in one-to-one correspondence with the N light-emitting devices. A first electrode of a first light-emitting device in the N light-emitting devices is configured to be coupled to the power supply signal terminal, a second electrode of an n-th light-emitting device in the N light-emitting devices is coupled to a first electrode of an (n+1)-th light-emitting device and an n-th signal channel terminal in the N signal channel terminals; N is a positive integer greater than 1, and n is a positive integer greater than or equal to 1 and less than or equal to N.