Distributed Driver Network for Display Panels
Solution Overview
Problem
Large display panels face challenges in driving LED arrays due to limitations in the number of rows a single LED driver can support, leading to reduced frame-refresh rates and increased parasitic resistance, which affects the smoothness of moving pictures and brightness, and results in a high data-line footprint on the substrate, increasing manufacturing costs.
Innovation Solution
A display panel with a distributed driver network where drivers and transceivers are daisy-chained to reduce the data-line footprint, using a fishbone topology to transmit pixel data efficiently, allowing more reliable data transmission and reducing the substrate's data-line footprint by using fewer data lines and enabling compact layout on multiple layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a star topology is used to network TCON, transceivers and drivers, then pixel data can be delivered to respective drivers, but the data-line footprint on the substrate becomes high
Solution Approach 1:
The patent segments the star topology into two separate daisy-chain topologies: one for connecting TCON to transceivers, and another for connecting transceivers to drivers. This segmentation reduces the data-line footprint by eliminating redundant connections while maintaining reliable data transmission through sequential daisy-chaining.
Solution Approach 2:
The patent transitions from a two-dimensional star topology to a one-dimensional daisy-chain topology, reducing the complexity of data line routing on the substrate. This dimensional change simplifies the interconnection structure and minimizes the area occupied by data lines.
2Productivity
If multiple LED drivers are distributed over a large display panel, then the number of rows each driver can support increases, but the data-line footprint increases
Solution Approach 1:
The patent divides the driver network into multiple distributed drivers, each responsible for a specific row segment. This segmentation allows each driver to efficiently manage fewer rows while the daisy-chain topology minimizes the data-line footprint by using a linear interconnection structure instead of a star topology.
Solution Approach 2:
The patent arranges drivers and transceivers in a linear daisy-chain configuration, reducing the spatial complexity of data line routing. This one-dimensional arrangement minimizes the footprint on the substrate compared to the two-dimensional star topology, enabling more drivers to be distributed across the panel.
3Reliability
If drivers are individually connected to TCON via transceivers in a star topology, then each driver receives pixel data independently, but manufacturing cost increases
Solution Approach 1:
The patent segments the independent star topology into hierarchical daisy-chains, reducing the number of data lines required. This segmentation maintains independent data reception capability while simplifying the manufacturing process by reducing substrate complexity and material requirements.
Solution Approach 2:
The patent changes the connection topology from two-dimensional star to one-dimensional daisy-chain, reducing manufacturing complexity. This dimensional simplification lowers production costs by requiring fewer data lines and simpler substrate routing while maintaining functional independence of each driver.
Data Source
AI summary
In a display panel, drivers for driving LEDs of pixels are distributed over a substrate, and transceivers relay pixel data from a timing controller to the drivers. The drivers are divided into groups. Respective drivers in a group receive corresponding pixel data addressed thereto solely from one corresponding transceiver. The corresponding transceiver and the respective drivers are daisy-chained to form one first linear daisy chain, where each pair of immediately-adjacent first drivers are connected. Plural first linear daisy chains are formed for all groups. The transceivers are daisy-chained to form a second linear daisy chain by connecting each pair of immediately-adjacent transceivers. The first and second linear daisy chains form a fishbone topology network to enable transmission of pixel data from the timing controller to the drivers while reducing a data-line footprint on the substrate that mounts the pixels, driver and transceivers in comparison to a conventional star-topology network.