Double-Sided Illuminating Device for Color and Monochrome Displays
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Solution Overview
Problem
In portable electronic devices like folder-type cellular phones, using a single illuminating device for both a color and a monochrome liquid crystal display panel results in the monochrome panel being limited to monochrome display, lacking chromatic capabilities, which affects the device's attractiveness and design.
Innovation Solution
A double-sided illuminating device with a light source, a light guide plate, and a whitening film that includes a fluorescent substance, allowing for different color outputs from a single light source, enabling the main color liquid crystal display panel to be illuminated in white and the auxiliary monochrome panel to be illuminated in a specific color, using a filter to achieve desired chromatic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single illuminating device is used for both color and monochrome liquid crystal display panels, then the number of parts and device complexity are reduced, but the monochrome panel is limited to monochrome display and cannot achieve chromatic display
Solution Approach 1:
The patent applies local quality by placing different optical films (color conversion films with different fluorescent substances) at different locations between the light guide plate and the liquid crystal display panels. This allows different regions to have different optical properties, enabling the color panel to receive white light while the monochrome panel receives colored light, thus resolving the contradiction between using a single illuminating device and achieving chromatic display on the monochrome panel.
2Reliability
If separate illuminating devices are used for main and auxiliary liquid crystal display panels, then each panel can be optimally illuminated, but costs and the number of parts increase
Solution Approach 1:
The patent applies segmentation by dividing the optical path into different regions using optical films with different properties. The color conversion films are selectively positioned to direct different wavelengths of light to different panels, allowing a single illuminating device to provide optimized illumination for both the color and monochrome panels simultaneously, thus resolving the contradiction between illumination quality and device complexity.
3Illumination intensity
If a transflective sheet is disposed between the light guide plate and the auxiliary liquid crystal display panel to increase light amount, then the main liquid crystal display panel receives sufficient light, but the auxiliary panel remains limited to monochrome display
Solution Approach 1:
The patent applies color changes by using color conversion films containing fluorescent substances that convert the wavelength of light. The auxiliary panel side is equipped with a color conversion film that converts blue or near-ultraviolet light to visible colored light, enabling the monochrome panel to display in color while the main panel receives appropriate white light illumination, thus resolving the contradiction between illumination intensity and chromatic display capability.
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
Enables chromatic display on both the main color and auxiliary monochrome liquid crystal display panels using a single illuminating device, enhancing the device's appearance and design by allowing the monochrome panel to display in a chosen color, improving brightness and color reproducibility.
Implementation Method 1
a whitening film disposed in a path of light emitted from the first light emitting surface and including a fluorescent substance for emitting light having a color component which becomes white light by being mixed with light emitted from the light source
Data Source
AI summary
A plurality of display portions are illuminated in different colors using a light source of a single type and a single light guide plate. A light source (220) has a light emitting element for emitting blue light, and a red fluorescent substance which is excited by blue light to generate red light, thereby emitting violet light (L1) as a whole. The violet light (L1) enters a side surface of a light guide plate (210) and is emitted from an upper surface (211) and a lower surface (212) as violet light (L1-1) and (L1-2), respectively. A green fluorescent substance is provided in a fluorescent film (230). The light (L2) obtained after the violet light (L1-1) passes through the fluorescent film (230), becomes white light because green color component light generated from the fluorescent substance is mixed with the violet light (L1-1). On the other hand, on a lower surface side, the violet light L1-2 is used as illuminating light.