TFT Substrate LED Driver Units for Display Connectivity
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Solution Overview
Problem
Conventional methods for fabricating full-color LED display devices face challenges due to the thickness of multilayer printed circuit boards and frequent defective short or open circuiting between interconnection lines, which affect the electrical connectivity and reliability of LED chips and driver circuits.
Innovation Solution
An LED display device utilizing a TFT substrate with matrix-arrayed LED driver units, including transistors, electrodes, and conductors to individually drive sub-pixels, along with a light transmitting plate and heat dissipating plate to manage light transmission and heat, respectively, thereby improving connectivity and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED chips are mounted on a multilayer printed circuit board, then electrical connectivity between driver circuits and LED chips is achieved, but the board thickness increases and interconnection lines are prone to short or open circuiting defects
Solution Approach 1:
The patent transitions from conventional multilayer PCB architecture to a TFT substrate-based structure where driver units are fabricated directly on the substrate in a matrix arrangement. This dimensional reorganization eliminates the need for thick multilayer boards with vias, as connections are made through planar TFT circuits and conductors on the same substrate plane, thereby reducing overall thickness while improving connectivity reliability.
Solution Approach 2:
The patent integrates the driver circuits and LED chip mounting substrate into a single TFT substrate structure. The driver units are fabricated directly on the TFT substrate using thin-film transistor processes, merging the functions of separate driver PCBs and LED mounting substrates. This integration eliminates interconnection defects between separate components while reducing overall system thickness.
2Ease of manufacture
If conventional PCB mounting methods are used, then LED chips and driver circuits can be connected, but frequent short or open circuiting defects occur between interconnection lines
Solution Approach 1:
The patent replaces conventional mechanical PCB trace interconnections with TFT-based electronic circuits. Instead of relying on physical copper traces and vias that are prone to short/open circuiting, the invention uses actively controlled TFT switches and conductors fabricated directly on the substrate. This substitution of passive mechanical connections with active semiconductor-based connections significantly improves reliability while maintaining ease of manufacture through standardized TFT fabrication processes.
Solution Approach 2:
The patent changes the fundamental parameter of interconnection methodology from conventional copper PCB traces to thin-film transistor-based conductive paths. By altering the material and structural parameters of the interconnection system to use TFT technology, the invention achieves both ease of manufacture through existing TFT fabrication capabilities and improved reliability through the inherent stability of thin-film transistor circuits.
3Reliability
If TFT substrate with matrix-arrayed driver units is used, then electrical connectivity and heat management are improved, but device structure becomes more complex
Solution Approach 1:
The TFT substrate serves multiple functions simultaneously: it acts as the mounting platform for LED chips, contains the driver circuit units in a matrix arrangement, provides electrical connections through integrated TFT circuits, and facilitates heat dissipation through its thermal conductivity. This multi-functionality consolidates what would otherwise be separate components into a single integrated structure, improving reliability while the modular matrix design maintains manufacturing simplicity.
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
The solution effectively addresses the issues of electrical connectivity and heat management, enhancing the reliability and performance of full-color LED display devices by using a TFT substrate with matrix-arrayed LED driver units and conductors to connect LED chips, reducing defects and improving display quality.
Implementation Method 1
a light transmitting plate attached to the upper portions of the LED chips and through which light emitted from the LED chips is transmitted
Implementation Method 2
a heat dissipating plate attached to the TFT substrate to dissipate heat generated from the LED chips
Data Source
AI summary
Disclosed is an LED display device using a TFT substrate provided with LED driver units. The LED display device includes a TFT substrate, LED chips, a light transmitting plate, and a heat dissipating plate. The TFT substrate includes a plurality of LED driver units arrayed in a matrix. Each of the LED driver units includes a plurality of transistors. The LED chips are attached to and driven by the corresponding LED driver units. The light transmitting plate is attached to the upper portions of the LED chips. Light emitted from the LED chips is transmitted through the light transmitting plate. The heat dissipating plate is attached to the TFT substrate to dissipate heat generated from the LED chips.