Reflective Film Irregularities for LCD Viewing Angle
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Solution Overview
Problem
Conventional methods for forming minute irregularities on reflective films in liquid crystal display devices are costly and yield inefficient results due to increased manufacturing steps and contamination risks, with difficulty in achieving high-density irregularities and maintaining display quality.
Innovation Solution
A liquid crystal display device with a reflective film featuring high-density irregularities formed by openings in laminated films, where the linear density of these openings is set to 0.2 or more, improving reflectance and viewing angle characteristics, and including a gap adjusting film and orientation control protrusions to reduce chromaticity differences and enhance optical compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If minute irregularities are formed on the reflective film surface using conventional photolithography and dry etching methods, then light scattering performance is improved, but manufacturing complexity and costs increase due to additional process steps
Solution Approach 1:
The organic insulating film is prepared with a rough surface topology before the reflective film is deposited. This preliminary surface preparation enables the reflective film to inherit the irregularities, eliminating the need for subsequent photolithography and dry etching steps to create the light-scattering structure.
Solution Approach 2:
The surface irregularity formation process is merged with the organic insulating film formation process. The same spin-coating and heating steps that form the organic insulating film also create the surface irregularities, combining two functions into one process sequence.
2Adaptability or versatility
If high-density irregularities are formed on the reflective film surface, then viewing angle characteristics are improved, but manufacturing yield decreases due to contamination risks from additional process steps
Solution Approach 1:
The surface irregularities are formed on the organic insulating film before the reflective film is deposited. This preliminary formation of irregularities allows high-density scattering structures to be created without requiring additional process steps that would introduce contamination risks and reduce manufacturing yield.
3Ease of manufacture
If a flat surface is used on the reflective film, then manufacturing is simpler, but viewing angle is extremely narrowed and reflection problems occur
Solution Approach 1:
The organic insulating film is formed with surface irregularities before the reflective film is deposited. This preliminary surface preparation enables the reflective film to inherit the irregularities, providing wide viewing angle characteristics without requiring complex post-processing steps.
Solution Approach 2:
The organic insulating film's surface topology automatically serves as the template for the reflective film's scattering structure. The reflective film inherits the irregularities from the underlying organic insulating film, eliminating the need for separate surface preparation processes.
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 solution achieves improved reflectance and viewing angle characteristics, enabling clear images over a wider range while maintaining display quality and reducing manufacturing costs by forming high-density irregularities on the reflective film.
Implementation Method 1
a reflective film which is formed on the first substrate and reflects light transmitted through the second substrate
Implementation Method 2
it is required to scatter light by providing minute irregularities on the surface of the reflective film
Data Source
AI summary
By circular or polygonal openings formed in at least one of a metal film, a semiconductor film, an insulating film and the like, which films are below a reflecting electrode, minute irregularities are densely formed on a surface of the reflecting electrode. In this case, it is required that a linear density defined by peripheral dimensions of the openings per unit area is equal to 0.2 or more.