Dual-LCD Display Layout for Higher Luminance and Lower Power
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Solution Overview
Problem
Existing display devices with overlapping display panels experience decreased luminance and power efficiency due to light transmittance issues, particularly in wristwatch-type electronic apparatuses and vehicle instrument panels.
Innovation Solution
A display device configuration with a backlight, first and second liquid crystal display panels, and polarizing plates, where the second panel lacks a color filter, and the backlight has multiple light sources with adjustable emission timings and colors, allowing for stereoscopic image display and enhanced luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two display panels are disposed in an overlapping manner, then multiple display modes can be provided, but transmittance decreases and luminance of the displayed image decreases
Solution Approach 1:
The color filter function is segmented: the first liquid crystal display panel includes a color filter while the second liquid crystal display panel does not include a color filter. This segmentation allows the second panel to transmit light more efficiently without the light-absorbing color filter, thereby improving luminance while maintaining the multi-display-mode capability through the overlapping configuration
Solution Approach 2:
Different regions of the display system have different optical properties: the first panel region has a color filter for full-color display, while the second panel region lacks a color filter to maximize light transmission. This local differentiation optimizes the overall luminance while preserving display versatility
2Adaptability or versatility
If two display panels are disposed in an overlapping manner, then multiple display modes can be provided, but display power efficiency decreases
Solution Approach 1:
The color filter is segmented to exist only in the first liquid crystal display panel and not in the second panel. This reduces the total amount of light-absorbing material in the optical path, improving overall transmittance and reducing the power required to achieve the same display brightness, thereby improving display power efficiency while maintaining multiple display modes
Solution Approach 2:
The optical parameters of the two panels are differentiated: the first panel has a color filter with specific transmission characteristics, while the second panel has no color filter, resulting in higher transmission. This parameter change optimizes the balance between display versatility and power efficiency
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 maintains high luminance and power efficiency by optimizing light transmission and emission timings, enabling full-color stereoscopic images with reduced power consumption.
Implementation Method 1
a first polarizing plate on which direct light from the backlight is incident and that transmits light polarized in a first direction and blocks light polarized in a direction different from the first direction
Implementation Method 2
a second polarizing plate on which transmitted light from the second liquid crystal display panel is incident and that transmits light polarized in a second direction different from the first direction and blocks light polarized in a direction different from the second direction
Implementation Method 3
The first liquid crystal display panel is provided with a first color filter that transmits first light, a second color filter that transmits second light different from the first light, and a third color filter that transmits third light different from the first light and the second light
Data Source
AI summary
According to an aspect, a display device includes: a backlight; a first polarizing plate that transmits light polarized in a first direction; a first liquid crystal display panel; a second liquid crystal display panel overlapping the first liquid crystal display panel with a gap interposed between the first and second liquid crystal display panels; and a second polarizing plate on which transmitted light from the second liquid crystal display panel is incident and that transmits light polarized in a second direction. The backlight has modes with different light emission timings respectively for light emission colors. The first liquid crystal display panel is provided with a first color filter, a second color filter, and a third color filter. The second liquid crystal display panel is not provided with a color filter. No other polarizing plate is provided between the first liquid crystal display panel and the second liquid crystal display panel.