LCD Driving IC Voltage Change Circuits for Pin Function Adaptability
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Solution Overview
Problem
The existing layout of liquid crystal displays (LCDs) does not support adjusting or alternating the voltages at the driving integrated circuits' pins, necessitating redesign for function changes, leading to high manufacturing costs for different versions or models.
Innovation Solution
Incorporating first and second voltage change circuits between the reference and voltage following pins, utilizing resistors and switching units with ESD protection to alter reference voltages, allowing for selective pin function changes without layout redesign.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the layout of conducting lines on the glass substrate is fixed, then the manufacturing process is simplified, but the ability to adjust reference voltages at driving IC pins is lost
Solution Approach 1:
The patent divides the voltage adjustment function into separate modules by placing switching units at different locations on the glass substrate. Each switching unit can independently control the connection between reference voltage pins and voltage following pins, allowing selective voltage adjustment without affecting the entire layout structure. This segmentation enables voltage customization while maintaining a fixed conducting line layout.
Solution Approach 2:
The patent introduces switching units that can dynamically change the electrical connection state between reference voltage pins and voltage following pins. By controlling the switching units, the reference voltages can be adjusted or alternated after manufacturing, transforming a static fixed-voltage system into a dynamic adjustable-voltage system without requiring layout redesign.
2Adaptability or versatility
If the conducting lines are redesigned to support voltage adjustment, then voltage flexibility is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the voltage adjustment function with the existing conducting line layout by integrating switching units into the current structure. Instead of creating separate adjustment circuits or redesigning the entire layout, the switching units are merged with the existing conducting lines, allowing voltage adjustment capabilities to be added without requiring complete layout redesign and reducing manufacturing costs.
Solution Approach 2:
The switching units act as intermediary elements between the reference voltage pins and voltage following pins. These intermediaries enable voltage adjustment by controlling the connection state, providing the desired flexibility without requiring direct redesign of the conducting lines themselves. The switching units mediate between the fixed layout and the adjustable voltage requirement.
3Adaptability or versatility
If multiple LCD versions are manufactured with different layouts, then functional versatility is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent creates a universal LCD layout that can support multiple functions through the inclusion of switching units. Instead of manufacturing different layout versions for different functions, a single universal layout with controllable switching units can adapt to various functional requirements by programming the switching units differently, eliminating the need for multiple layout variations and reducing manufacturing complexity.
Data Source
AI summary
An exemplary LCD (2) includes a glass substrate (29) having a display area (21); driving integrated circuits (ICs) (210) disposed at two adjacent sides of the glass substrate for providing image signals to the display area; first and second voltage change circuits (216, 217); and a flexible printed circuit board (FPCB) connected to the glass substrate at a corner for providing operating voltages to the driving ICs. The driving IC includes first reference voltage pins, second reference voltage pins, first voltage following pins, second voltage following pins, and an operating voltage input pin. The first voltage change circuits are respectively connected between the first reference voltage pins and the corresponding first voltage following pins. The second voltage change circuits are respectively connected between the second reference voltage pins and the corresponding second voltage following pins.