Light Guide Geometry for Display Device Light Incidence
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Solution Overview
Problem
Display devices using polymer dispersed liquid crystal face degradation in display quality due to inefficient light incidence, particularly when the height of the light-emitting portion is not optimally aligned with the light guide, leading to reduced light contribution and decreased display quality.
Innovation Solution
Incorporating a light guide between the light-emitting elements and the second substrate, with a specific geometry and positioning to ensure optimal light incidence, including a first surface with a higher end portion located above the light-emitting portion and a fourth surface inclined to enhance light reflection and guidance, thereby improving light incidence efficiency without increasing the thickness of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the light-emitting portion height is not optimally aligned with the light guide, then the device structure is simpler, but light incidence efficiency decreases
Solution Approach 1:
The light guide is designed with a three-dimensional structure including a light incident surface, light guiding portion, and light emitting surface at different heights and positions. By utilizing vertical and horizontal positioning in multiple dimensions, the light guide effectively captures light from light-emitting portions at various heights and directs it to the display panel, resolving the contradiction between structural simplicity and light incidence efficiency.
Solution Approach 2:
The patent optimizes specific geometric parameters of the light guide including the position of the light emitting surface, the shape of the light guiding portion, and the angles of incident and emitted light surfaces. By adjusting these parameters, the light guide maintains high light incidence efficiency across different light-emitting portion heights without requiring complex active adjustment mechanisms.
2Loss of energy
If the display panel thickness is increased to improve light incidence, then light incidence efficiency improves, but the overall device thickness increases
Solution Approach 1:
The light guide acts as an intermediary component between the light-emitting portions and the display panel. It captures light that would otherwise be lost due to misalignment or distance, and efficiently directs it to the display panel. This mediator approach improves light incidence efficiency without requiring increased panel thickness, as the light guide handles the light redirection function externally.
Solution Approach 2:
Instead of increasing thickness in the vertical dimension to improve light incidence, the patent utilizes the horizontal and angular dimensions through the light guide's geometry. The light guide captures light from various positions and directs it at appropriate angles to the display panel, achieving high light incidence efficiency without increasing the overall device thickness.
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 configuration effectively suppresses the decrease in light incidence efficiency and maintains high display quality by ensuring most emitted light is guided to the display panel, even with varying light-emitting portion heights, without increasing the thickness of the display device.
Implementation Method 1
a fourth surface inclined to enhance light reflection and guidance
Implementation Method 2
polymer dispersed liquid crystal capable of switching between a scattering state of scattering incident light and a transmitting state of transmitting incident light
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate opposed to the first substrate and including an end portion, a liquid crystal layer provided between the first substrate and the second substrate and including a polymer in a shape of a streak and a liquid crystal molecule, a light-emitting element having a light emitting portion opposed to the end portion, and a light guide located between the end portion and the light emitting portion.