Dual-Side Thin Film Transistor Array Panel for Wide Viewing Angle LCDs
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from reduced luminance and contrast ratio when viewed at angles other than perpendicular to the screen, limiting their wide viewing angle and contrast ratio performance.
Innovation Solution
A thin film transistor array panel is designed with a substrate having thin film forms on both surfaces, including gate electrodes, semiconductor layers, source and drain electrodes, passivation layers, and polarizers, with a lattice pattern on the polarizer, and a double display panel structure with liquid crystal layers between the panels, enhancing symmetry and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional LCD structure with single-sided thin film forms is used, then the device complexity is lower, but the viewing angle is limited and contrast ratio decreases at oblique viewing angles
Solution Approach 1:
The patent applies dimensionality change by forming thin film transistor structures on both the front and back surfaces of the substrate, transitioning from a conventional single-sided structure to a dual-sided configuration. This enables the liquid crystal molecules to be controlled from both directions, achieving wide viewing angle characteristics (80 degrees or more) while maintaining high contrast ratio, as the symmetric structure compensates for viewing angle-dependent performance degradation
Solution Approach 2:
The patent utilizes asymmetry in the sense of creating symmetric structures on opposite sides of the substrate. By forming identical thin film transistor structures on both the front and back surfaces with proper orientation, the device achieves symmetric optical properties that enable wide viewing angle and high contrast ratio, resolving the technical contradiction between structural complexity and performance
2Adaptability or versatility
If thin film forms are formed on both surfaces of the substrate, then viewing angle and contrast ratio are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process is extended to the third dimension by utilizing both surfaces of the substrate. Thin film transistor structures are formed on the front surface and back surface of the substrate through sequential processing steps, enabling high contrast ratio and wide viewing angle while maintaining manufacturing feasibility through systematic process design
Solution Approach 2:
The patent applies preliminary action by forming the thin film transistor structures on both surfaces before assembling the complete display device. The thin film forms are prepared in advance on the substrate surfaces, and then liquid crystal layers are filled and other components are assembled, streamlining the manufacturing process
3Illumination intensity
If a double display panel structure with liquid crystal layers on both sides is used, then optical properties and viewing angle are enhanced, but the device complexity increases
Solution Approach 1:
The patent applies dimensionality change by creating a symmetric dual-sided panel structure where thin film transistor arrays are formed on both the front and back surfaces of the substrate. Liquid crystal layers are positioned on both sides of the substrate, enabling the device to maintain high optical properties and wide viewing angle (80 degrees or more) while achieving high contrast ratio through the coordinated operation of both panels
Solution Approach 2:
The patent merges the functionality of two display panels into a single integrated structure by forming thin film transistor structures on both surfaces of one substrate and filling liquid crystal layers between the substrate and opposing panels. This combined structure achieves enhanced optical properties and wide viewing angle while reducing the overall device complexity compared to using two separate panels
Data Source
AI summary
A thin film transistor array panel, a display device including the thin film transistor array panel, and a method for manufacturing the display device. The thin film transistor array panel includes a substrate having first and second surfaces, a first thin film form formed on the first surface and including a first electrode, and a second thin film form formed on the second surface and including a second electrode, to thereby improve the viewing angle and contrast ratio of the display device.