Display device that includes light blocking portion with inclined portion
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Solution Overview
Problem
The displacement of the second electrode, common wiring line, and reflection suppressing layer in liquid crystal display devices can lead to distortion of the electrical field, resulting in reduced luminance and visible dark lines.
Innovation Solution
The display device incorporates a light blocking portion with inclined portions at the boundary between color filters, overlapping electrodes, and wiring lines, designed to mitigate displacement and maintain electrical field integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the common wiring line and reflection suppressing layer are positioned close to the slit to reduce displacement impact, then manufacturing precision is improved, but the electrical field distortion increases when displacement occurs
Solution Approach 1:
The light blocking portion serves as an intermediary structure between the slit and the common wiring line/reflection suppressing layer. It physically blocks these conductive elements from entering the slit region, mediating the interaction between displacement and electrical field distortion. The light blocking portion with its inclined surface prevents the harmful effect of conductive elements entering the slit while maintaining manufacturing feasibility.
Solution Approach 2:
The light blocking portion is positioned in advance to prevent the common wiring line and reflection suppressing layer from entering the slit. By having this preventive structure already in place before displacement occurs, the system counteracts the potential harmful effect of displacement, preventing electrical field distortion before it can occur.
2Ease of manufacture
If the light blocking portion has a vertical end portion, then manufacturing is simpler, but displacement causes the common wiring line and reflection suppressing layer to enter the slit completely
Solution Approach 1:
The light blocking portion transitions from a symmetric vertical structure to an asymmetric structure with an inclined surface. The inclined surface is asymmetrically positioned to specifically address the direction of potential displacement, creating a structure that is more tolerant to displacement while remaining manufacturable. This asymmetric design allows the top surface to slope away from the slit, preventing entry even when displacement occurs.
Solution Approach 2:
The light blocking portion has different structural qualities at different locations: the side away from the slit remains vertical for manufacturing simplicity, while the side facing the slit has an inclined surface for displacement tolerance. This local differentiation of structural quality optimizes both manufacturing ease and displacement resistance.
3Manufacturing precision
If the inclined portion angle is increased to better prevent displacement, then displacement tolerance is improved, but the structural complexity increases
Solution Approach 1:
The inclined surface is defined by a specific angle parameter (alpha) that can be optimized to balance displacement tolerance and manufacturing complexity. By treating the angle as a可调 parameter, the design allows for optimization of the inclined portion's geometry to achieve the desired displacement compensation while keeping the structural complexity manageable through a single geometric parameter.
Data Source
AI summary
A display device includes a light blocking portion and a slit. A portion of an upper layer electrode overlapping a lower layer electrode is provided with a slit extending along a second direction inclined with respect to a first direction. An inclined portion extending along a third direction inclined toward the same side as the second direction with respect to the first direction is included in an end portion, of outer peripheral end portions of the light blocking portion, adjacent to the slit in the first direction. A second angle of the inclined portion that is an angle formed by the third direction with respect to the first direction is larger than a first angle that is an angle formed by the second direction with respect to the first direction.