Divided Source PCB for Large LCD Panels
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Solution Overview
Problem
Large-size LCD devices face challenges in aligning source chip-on-films with source printed circuit boards due to increased size, which complicates manufacturing and increases costs, as existing automatic mounting equipment is not designed to handle larger PCBs and results in difficulties with data line alignment and increased output pins.
Innovation Solution
A liquid crystal display device with a divided source printed circuit board structure, utilizing line-on-glass wirings and integrated circuits to reduce the size of the control PCB and number of output pins, and incorporating a timing controller with a single output port to transfer timing control signals and digital video data, along with data modulators to minimize electromagnetic interference and swing width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the LCD panel size is increased, then the display area is improved, but the number of data lines and source COFs increases, leading to increased source PCB size and manufacturing complexity
Solution Approach 1:
The invention divides the source PCB into multiple smaller source PCBs, each handling a portion of the data lines and source COFs. This segmentation allows the system to support larger display areas while keeping each individual PCB manageable in size and compatible with existing manufacturing equipment.
2Area of moving object
If the source PCB size is increased to accommodate more data lines, then the LCD panel size can be increased, but alignment of source COFs with source PCB becomes difficult
Solution Approach 1:
By dividing the source PCB into smaller modular units, each module can be precisely aligned with its corresponding source COFs using existing alignment equipment, thereby maintaining manufacturing precision while supporting larger overall display areas.
Solution Approach 2:
The invention introduces a spatial dimension by arranging multiple smaller source PCBs in a distributed configuration rather than using a single large PCB, allowing each small PCB to be precisely positioned and aligned independently with its associated source COFs.
3Area of moving object
If the source PCB size is increased beyond current equipment capabilities, then larger LCD panels can be supported, but existing automatic mounting equipment cannot handle the larger PCB
Solution Approach 1:
The source PCB is divided into multiple smaller source PCBs that fall within the handling capabilities of existing automatic mounting equipment, allowing standard equipment to be used for manufacturing larger LCD panels without requiring new specialized equipment.
4Area of moving object
If the number of circuit devices and output pins increases to support larger LCD panels, then the display capability is improved, but manufacturing costs increase
Solution Approach 1:
The invention segments the circuit devices and output pins across multiple smaller source PCBs, allowing for more efficient use of components and reduced manufacturing costs while supporting larger display areas.
Solution Approach 2:
Multiple smaller source PCBs are combined to function as a unified system supporting large LCD panels, achieving the desired display capability while maintaining cost-effectiveness through standardized manufacturing processes for smaller PCB units.
Data Source
AI summary
A liquid crystal display (LCD) device having a simplified printed circuit board (PCB) is disclosed. The LCD device includes a first integrated circuit (IC) group operating in accordance with timing control signals to convert digital video data into data voltage and to supply the data voltage to a first data line group, and a second IC group receiving the timing control signals and the digital video data via a first source PCB and LOG wirings and operating in accordance with the timing control signals to convert the digital video data into the data voltage and to supply the data voltage to a second data line group Each IC of the first and second IC groups includes a polarity control signal (POL) generator for generating a polarity control signal to control a polarity of the data voltage, using a part of the timing control signals.