Transflective LCD Substrate Fabrication with Five Mask Processes
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Solution Overview
Problem
The manufacturing process of transflective liquid crystal display devices is complex and costly due to the requirement of multiple mask processes in fabricating the thin film transistor substrate, which increases the overall production cost.
Innovation Solution
A simplified method for fabricating a transflective thin film transistor substrate using five mask processes, involving the formation of a gate pattern, semiconductor pattern, reflection electrode, and pixel electrode, with a transmission hole to ensure equal light path lengths in both reflection and transmission modes, thereby reducing the complexity and cost of the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple mask processes are used in fabricating the thin film transistor substrate, then the manufacturing precision and device performance are improved, but the manufacturing complexity and production cost increase
Solution Approach 1:
The patent combines multiple mask processes into a simplified fabrication method using five mask processes to form the gate pattern, semiconductor pattern, reflection electrode, and pixel electrode simultaneously or in sequence, reducing the total number of separate masking operations required while maintaining manufacturing precision
Solution Approach 2:
The fabrication method creates multiple functional layers (gate, semiconductor, reflection electrode, pixel electrode) through an integrated process sequence, where each mask process serves multiple purposes in defining different structural elements of the thin film transistor substrate
2Adaptability or versatility
If multiple mask processes are used in fabricating the thin film transistor substrate, then the device functionality is improved, but the production cost increases
Solution Approach 1:
The patent integrates the formation of multiple functional components into a unified fabrication sequence with five mask processes, reducing the cumulative cost associated with multiple separate photolithography and etching operations while preserving all required device functionalities
Solution Approach 2:
The fabrication method performs preliminary patterning actions in the first five mask processes to pre-establish the gate, semiconductor, reflection electrode, and pixel electrode structures, enabling subsequent assembly and liquid crystal filling without requiring additional complex manufacturing steps
3Stability of the object's composition
If transmission hole is formed in the organic film, then the light path length is equalized in reflection and transmission modes, but the manufacturing process complexity increases
Solution Approach 1:
The transmission hole is formed in the organic film during the preliminary fabrication stages through the five mask processes, ensuring that the light path length is equalized in both reflection and transmission modes before final device assembly, eliminating the need for post-processing adjustments
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 simplified process reduces the manufacturing complexity and cost by achieving efficient light transmission and reflection modes with fewer mask processes, enhancing the production efficiency of transflective liquid crystal display devices.
Implementation Method 1
The reflection electrode 28 reflects an external light that is incident through a color filter substrate toward the color filter substrate
Implementation Method 2
the reflection electrode 28 on top of the organic film 24 also has the embossing shape, thereby increasing its reflection efficiency due to its dispersion effect
Implementation Method 3
The potential difference causes liquid crystal molecules having dielectric anisotropy to rotate, thereby controlling the transmissivity of the light that passes through a liquid crystal layer
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate and a liquid crystal layer between the first and second substrates. The liquid crystal display device further includes a gate line on the first substrate, a first insulation film on the gate line, a data line crossing the gate line such that the data line and the gate line define a pixel region with a transmission area and a reflection area, a thin film transistor connected to the gate line and the data line, a storage capacitor including a storage line crossing the data line and an upper storage electrode connected to the thin film transistor, a second insulation film on the thin film transistor with a transmission hole defined through the second insulation film, a reflection electrode disposed on the second insulation film in the reflection area and connected to a portion of the upper storage electrode through the transmission hole, and a pixel electrode disposed in the pixel region and connected to the reflection electrode.