Reflective Metal Layer Over Black Matrix for Display Light Utilization
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Solution Overview
Problem
Display devices face a challenge in achieving high aperture ratios due to the limitations imposed by the black matrix configuration, which restricts the improvement in light transmission efficiency despite the use of transparent electrodes, leading to reduced light utilization from backlights.
Innovation Solution
The implementation of a reflective layer with the highest reflectance, positioned over the black matrix areas, reflects light back towards the backlight, thereby reducing absorption and enhancing light transmission through the open portions of the display area, while maintaining the structural integrity and functionality of the display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the black matrix is disposed on the color filter to arrange wirings in an overlapping manner, then the wirings become invisible from the display surface, but the aperture ratio is limited and light transmission efficiency is reduced
Solution Approach 1:
The patent converts the harmful light absorption by the black matrix into a beneficial effect by introducing a reflective layer. The reflective layer reflects light that would otherwise be absorbed by the black matrix back toward the backlight, thereby increasing light transmission efficiency while maintaining the black matrix's structural role in defining pixel boundaries and hiding wirings.
Solution Approach 2:
The reflective layer acts as an intermediary between the black matrix and the backlight. It mediates the interaction by reflecting light from the black matrix area back toward the backlight, thus improving light utilization without compromising the black matrix's function in controlling wiring visibility.
2Illumination intensity
If transparent electrodes are used for all electrodes to obtain high aperture ratio, then wiring visibility is reduced, but the black matrix still limits further improvement in aperture ratio
Solution Approach 1:
The patent transforms the light-absorbing property of the black matrix from a disadvantage into an advantage by using the reflective layer to redirect absorbed light back toward the backlight. This increases the effective light transmission through the display panel while maintaining the black matrix's essential function in defining pixel boundaries.
Solution Approach 2:
The patent changes the optical parameter of the black matrix area by introducing a reflective layer with high reflectance. This parameter change transforms the net light absorption into net light reflection, thereby improving overall light transmission efficiency without altering the black matrix's structural configuration.
3Measurement precision
If definition is increased to improve display quality, then the number of pixels and wirings increases, but the occupation ratio of wirings increases and aperture ratio decreases
Solution Approach 1:
The patent addresses the aperture ratio reduction caused by increased wiring density at higher definitions by using the reflective layer to compensate for the lost light transmission. The reflective layer reflects light back toward the backlight, maintaining effective light utilization even as the aperture ratio decreases due to increased wiring occupation.
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
This solution effectively increases the light utilization efficiency, allowing for a brighter image display even with increased definition, by minimizing light absorption by the black matrix and optimizing the reflectance of the metal layers in the display device.
Implementation Method 1
a metal layer having the largest area in areas overlapping the plurality of first line segments among the plurality of metal layers is the same as a metal layer having the largest area in areas overlapping the plurality of second line segments among the plurality of metal layers. The metal layer that has the largest area in the areas overlapping the plurality of first line segments and the largest area in the areas overlapping the plurality of second line segments is formed of a metal layer having the highest reflectance among the plurality of metal layers.
Data Source
AI summary
According to an aspect, a display device includes a display area portion in which first line segments and second line segments intersect each other and are arranged in a grid to form a non-open portion that divides a light-transmitting opening into open portions, and the open portions form pixels arranged in a matrix. Metal layers are formed on a color filter in the display area portion and disposed in positions overlapping the non-open portion. A metal layer having the largest area in areas overlapping the first line segments among metal layers is the same as a metal layer having the largest area in areas overlapping the second line segments among those of metal layers, and is formed of a metal layer having the highest reflectance among the metal layers.