LCD Data Pad Diverse Pitch Design for Misalignment Compensation
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Solution Overview
Problem
Existing LCD devices face misalignment issues due to differential expansion of data pad units with constant pitch, leading to fabrication challenges and increased costs.
Innovation Solution
Implementing a diverse pitch design for data pads in the data driving block, where the pitch increases with distance from the central portion, allowing for compensation of misalignment and reducing the overall size of the data driving block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a constant pitch design is used for data pads, then manufacturing is simplified, but misalignment occurs due to differential expansion
Solution Approach 1:
The patent applies local quality by varying the pitch of data pads in different regions of the data driving block. Specifically, the pitch is adjusted in areas prone to differential expansion while maintaining constant pitch in other regions, allowing localized compensation for thermal effects without redesigning the entire pad structure.
Solution Approach 2:
The patent changes the geometric parameter of data pad pitch from a constant value to a variable value in specific regions. This parameter modification allows the structure to compensate for differential expansion by creating intentional pitch variations that counteract the expansion effects, thereby maintaining alignment precision.
2Manufacturing precision
If a diverse pitch design is implemented to prevent misalignment, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
Rather than implementing diverse pitch throughout the entire data driving block, the patent applies pitch variation only in specific local regions where differential expansion occurs. This localized approach maintains manufacturing precision where needed while avoiding unnecessary complexity in other areas.
Solution Approach 2:
The patent segments the data pad structure into regions with different pitch characteristics. By dividing the data driving block into zones with constant pitch and zones with varied pitch, the design achieves precision where required while maintaining simplicity in other regions, thus reducing overall device complexity.
3Productivity
If the data driving block size is reduced, then productivity increases, but misalignment compensation becomes more difficult
Solution Approach 1:
The patent modifies the pitch parameter of data pads to enable misalignment compensation within a compact footprint. By strategically varying the pitch in specific regions, the design achieves effective compensation for differential expansion without requiring a larger overall data driving block structure.
Solution Approach 2:
The patent concentrates pitch variation in specific local regions where it is most effective for misalignment compensation. This localized quality enhancement allows the data driving block to maintain a reduced overall size while still achieving the necessary compensation functionality in critical areas.
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 diverse pitch design effectively prevents misalignment and reduces the size of the data driving block, thereby decreasing fabrication costs and improving manufacturing efficiency.
Implementation Method 1
liquid crystal molecules of the liquid crystal layer are driven by a voltage applied to the common and pixel electrodes that generates an electric field between the lower and upper substrate
Implementation Method 2
the data pads are each to transmit a data signal from the data driving block to a data line of the liquid crystal panel
Data Source
AI summary
A liquid crystal display (LCD) includes a liquid crystal panel a liquid crystal panel including first and second substrates, and a liquid crystal layer disposed between the first and second substrates; a gate driving block including a plurality of gate drivers disposed in an edge area of the first substrate; a data driving block including a plurality of data drivers each connected to the first substrate and to a source printed circuit board (PCB) by a respective tape carrier package (TCP) of a plurality data TCPs; and a data pad unit disposed on each data TCP, wherein pitches of data pads disposed on each data pad unit are different in different portions of the of each data TCP, and the data pads are each to transmit a data signal from the data driving block to a data line of the liquid crystal panel.