Transflective LCD Gate Line Double Layer Contact Structure
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Solution Overview
Problem
The manufacturing process of transflective liquid crystal display devices is complex, leading to increased costs and a reduced aperture ratio in transmissive areas due to the need for multiple mask processes and separate contact holes for connecting pixel electrodes with drain and storage electrodes.
Innovation Solution
A transflective thin film transistor substrate is fabricated using a double layer conductive structure for the gate line, with a simplified process that eliminates the need for separate contact holes by forming the pixel electrode connected to the drain and storage electrodes through a transmission hole, reducing the number of mask processes required from six to five.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple mask processes are used to form separate contact holes for connecting pixel electrodes with drain and storage electrodes, then the connections are established, but the aperture ratio of the transmissive area is reduced and manufacturing complexity increases
Solution Approach 1:
The invention merges the formation of multiple contact holes into a single unified contact hole structure. The transmission hole serves as a common opening through which the pixel electrode connects to both the drain electrode and storage electrode, eliminating the need for separate contact holes and multiple mask processes. This consolidation reduces fabrication complexity while maintaining precise electrical connections.
Solution Approach 2:
The single transmission hole performs multiple functions simultaneously: it serves as the contact opening for the pixel electrode, provides the connection path to the drain electrode, and enables the connection to the storage electrode. This multi-functional design replaces what would traditionally require multiple specialized contact holes, simplifying the overall fabrication process.
2Reliability
If multiple mask processes are used to form separate contact holes, then the electrode connections are established, but the number of manufacturing steps increases leading to higher costs
Solution Approach 1:
The invention combines multiple sequential manufacturing steps into a single integrated process. By forming one transmission hole instead of multiple separate contact holes, the number of mask processes is reduced, directly improving manufacturing efficiency and reducing production costs while maintaining reliable electrode connections.
Solution Approach 2:
The transmission hole is formed in advance to accommodate multiple connection requirements simultaneously. This preliminary action of creating a unified opening structure eliminates the need for subsequent separate contact hole formation steps, streamlining the manufacturing process and improving productivity.
3Manufacturing precision
If separate contact holes are formed for pixel electrode connections, then the connections are established, but the transmissive area aperture ratio is reduced
Solution Approach 1:
The invention merges multiple separate contact holes into a single transmission hole structure. This consolidation reduces the total area occupied by contact openings in the transmissive region, thereby increasing the aperture ratio while still providing accurate electrical connections between the pixel electrode, drain electrode, and storage electrode.
Data Source
AI summary
A liquid crystal display device is provided that includes: first and second substrate; a gate line of a double layer having a first transparent conductive layer and a second opaque conductive layer on the first substrate; a first insulation layer on the gate line; a data line crossing the gate line to define a pixel region, the pixel region having a transmissive region and a reflective region; a thin film transistor connected to the gate and data lines; a pixel electrode formed of the transparent conductive layer in the pixel region; an upper storage electrode forming a storage capacitor by overlapping the gate line with the first insulation layer there between; a transmission hole to exposing the pixel electrode by passing through a second insulation layer on the thin film transistor to the first insulation layer; a reflective electrode connecting the pixel electrode with a drain electrode and the upper storage electrode through an edge part of the transmission hole; a gate pad extending from the first conductive layer of the gate line; a data pad formed of the first conductive layer and connected to the data line through a data link; and a liquid crystal layer between the first and second substrates, wherein the first and second insulation layers are removed in the gate and data pads.