Transparent Conductive Layer for Display Panel Shielding
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Solution Overview
Problem
Conventional transverse-electric-field type display panels face challenges in maintaining display performance due to the unpredictable orientation of liquid crystal molecules caused by the relocation of the shielding electrode layer inside the color filter substrate, leading to issues with transmittance and contrast ratio.
Innovation Solution
A display panel design where a transparent conductive layer is positioned between the second substrate and the liquid crystal layer, with specific voltage differences between the transparent conductive layer and the common electrode optimized to maintain better transmittance and contrast ratio, while also shielding against electromagnetic interference and electrostatic charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the shielding electrode layer is moved into the inner side of the color filter substrate, then the thinning process can be simplified, but the vertical electric field between the shielding electrode layer and the pixel electrode causes unpredictable orientation of the liquid crystal molecule, affecting display performance
Solution Approach 1:
The patent introduces a transparent conductive layer as an intermediary between the pixel electrode and the liquid crystal layer. This intermediate layer acts as a buffer to shield the liquid crystal molecules from the vertical electric field generated by the relocated shielding electrode layer, thereby maintaining predictable liquid crystal orientation while allowing the shielding electrode to be positioned inside the color filter substrate for simplified manufacturing
Solution Approach 2:
The transparent conductive layer is designed to preemptively counteract the harmful vertical electric field before it can affect the liquid crystal molecules. By placing this conductive layer closer to the pixel electrode, the patent creates a preliminary protective barrier that neutralizes the adverse electric field effects, ensuring stable liquid crystal orientation despite the relocated shielding electrode
2Productivity
If the shielding electrode layer is formed on the surface of the color filter substrate facing the liquid crystal layer before bonding, then the transportation cost is reduced, but the vertical electric field causes unpredictable liquid crystal molecule orientation
Solution Approach 1:
The transparent conductive layer serves as a mediating element that allows the shielding electrode to be positioned in a location that reduces transportation costs (on the color filter substrate surface before bonding) while simultaneously protecting the liquid crystal molecules from the harmful vertical electric field, thus maintaining display performance stability
3Manufacturing precision
If a transparent conductive layer is added between the second substrate and the liquid crystal layer, then transmittance and contrast ratio are improved, but the device structure becomes more complex
Solution Approach 1:
The transparent conductive layer is designed to perform multiple functions simultaneously: it acts as a shielding layer to control the electric field, serves as a transparent conductive element for electrical connection, and functions as part of the overall display structure. By consolidating these functions into a single layer, the patent improves transmittance and contrast ratio while minimizing the increase in structural complexity
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 proposed design enhances transmittance and contrast ratio by controlling the voltage differences between the transparent conductive layer and the common electrode, effectively addressing the display performance issues associated with the relocation of the shielding electrode layer and providing improved shielding against electromagnetic interference and electrostatic charges.
Implementation Method 1
a transparent conductive layer is additionally disposed between two substrates... shielding electrode layer is disposed on a surface of a color filter substrate opposite to a liquid crystal layer in order to prevent the vision effect of the display panel from being affected by the accumulation of electrostatic charges
Implementation Method 2
When a liquid crystal molecule of the liquid crystal layer is a positive liquid crystal molecule, an absolute voltage difference between the transparent conductive layer and the common electrode is smaller than or equal to 2.3 volts(V). When the liquid crystal molecule of the liquid crystal layer is a negative liquid crystal molecule, the absolute voltage difference between the transparent conductive layer and the common electrode is smaller than or equal to 5V
Data Source
AI summary
The display panel includes a first substrate, a second substrate, pixel structures, a liquid crystal layer and a transparent conductive layer. The liquid crystal layer is disposed between the pixel structures and the second substrate. The transparent conductive layer is disposed between the second substrate and the liquid crystal layer. When a liquid crystal molecule of the liquid crystal layer is a positive liquid crystal molecule, an absolute voltage difference between the transparent conductive layer and the common electrode is smaller than or equal to 2.3 volts(V). When the liquid crystal molecule of the liquid crystal layer is a negative liquid crystal molecule, the absolute voltage difference between the transparent conductive layer and the common electrode is smaller than or equal to 5V.