Auxiliary Optical Source for Fluorescent Lamp Lighting Delay
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Solution Overview
Problem
Liquid crystal display devices experience a time delay in lighting due to the absence of electrons in fluorescent lamps when left in darkness, leading to a delay in image display as the lamps require time to reinitiate discharge after being turned on.
Innovation Solution
Incorporating an auxiliary optical source below the fluorescent lamps, which applies light with a wavelength shorter than 500 nm, such as blue or ultraviolet light, to generate electrons and reduce the delay in lighting by providing activation energy, and positioning it below the central axis of the lamps to minimize light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fluorescent lamps are used as optical sources, then light can be supplied to the liquid crystal panel, but time delay in lighting occurs when the device is left in darkness
Solution Approach 1:
The patent applies preliminary action by introducing an auxiliary optical source that activates before the main fluorescent lamp to generate electrons in advance. This auxiliary source irradiates the fluorescent lamp tube with light having a wavelength shorter than 500 nm to stimulate electron generation, so that when the main lamp is turned on, electrons are already present and ready for immediate discharge, eliminating the lighting delay that occurs after prolonged darkness.
2Loss of time
If auxiliary optical source is added to reduce time delay, then lighting speed improves, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the auxiliary optical source to serve multiple functions: it generates electrons in the fluorescent lamp tube, activates the phosphor coating, and prepares the gas discharge environment. This multi-functional approach allows a single auxiliary component to address the lighting delay issue while minimizing the need for additional separate systems, thereby reducing overall device complexity despite adding functionality.
3Loss of time
If auxiliary optical source is positioned below fluorescent lamp, then electron generation is effective, but light leakage may occur
Solution Approach 1:
The patent applies local quality by positioning the auxiliary optical source below the fluorescent lamp tube and directing its light output upward through the tube wall. This localized illumination strategy ensures that the auxiliary light acts precisely where needed (at the tube interior surface to stimulate electron generation) while the tube structure itself serves as a barrier that prevents the auxiliary light from leaking outward, thus solving both electron generation efficiency and light leakage prevention.
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 auxiliary optical source significantly reduces the time delay in lighting by generating electrons quickly, ensuring immediate light emission and minimizing light leakage, thereby enhancing the image display quality of liquid crystal display devices.
Implementation Method 1
an auxiliary optical source for supplying light to the fluorescent lamps
Implementation Method 2
when a high voltage is applied to the electrode, electrons in the tube are drawn to the electrode, moving at high speed, and then collide with the electrode. As a result, secondary electrons are emitted to initiate discharge
Implementation Method 3
An inner wall of the lamp is coated with a fluorescent material and an electrode is formed at both ends of the tube
Implementation Method 4
a reflector disposed above the bottom cover, covering the through-holes and reflecting the light emitted from the fluorescent lamps toward the liquid crystal panel
Data Source
AI summary
A liquid crystal display device capable of reducing a time delay in lighting of the liquid crystal display device includes a liquid crystal panel, at least one fluorescent lamps disposed below the liquid crystal panel, formed as a cylindrical shape having a central axis and supplying light to the liquid crystal panel, and at least one auxiliary optical source disposed to face the liquid crystal panel while having the central axis therebetween and supplying light to the fluorescent lamps.