Quantum Dot Color Filter Polarization Loss Reduction
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Solution Overview
Problem
Display apparatuses with light receiving panel structures suffer from significant optical losses due to light passing through various components before reaching the display panel, resulting in reduced light exiting the panel compared to the light emitted from the source.
Innovation Solution
Incorporating a liquid crystal panel with a first and second polarization layer, a color filter featuring a quantum dot layer to filter and convert light, and a light compensation layer such as a dual brightness enhancement film (DBEF) to reflect and diffuse light, minimizing polarization-induced losses and improving optical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light passes through multiple optical components (light guide plate, optical sheets, polarization layers) to reach the display panel, then the display apparatus can function properly with image display capability, but significant optical losses occur and the amount of light exiting the panel is remarkably less than the light emitted from the light source
Solution Approach 1:
The patent recovers light that would otherwise be lost by placing a light redirecting film on the rear surface of the light guide plate to reflect scattered light back toward the display panel, and by using a polarization maintaining film to preserve the polarization state of light passing through optical sheets, thereby reducing overall optical loss while maintaining display functionality
Solution Approach 2:
The patent introduces intermediate components such as a polarization maintaining film between the light source and display panel to preserve optical properties, and a light redirecting film as an intermediary to recover and redirect scattered light, thereby reducing optical losses without compromising display performance
2Measurement precision
If a color filter with quantum dot layer is used to filter and convert light to preset colors, then color accuracy is improved, but light becomes unpolarized after collision with quantum dots causing additional optical losses
Solution Approach 1:
The patent applies preliminary polarization filtering before light reaches the quantum dot color filter, and uses a polarization maintaining film afterward to preserve the polarization state, ensuring that light maintains its polarization properties through the color conversion process and reducing subsequent optical losses in the display stack
Solution Approach 2:
The patent changes the polarization state parameters of light by using a polarization maintaining film to preserve polarization after quantum dot interaction, thereby compensating for the depolarizing effect of the quantum dots and reducing optical losses while maintaining color accuracy
3Loss of energy
If a dual brightness enhancement film (DBEF) is used to reflect and recycle light, then optical efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The patent uses a DBEF that serves multiple functions: it acts as both a polarization filter and a light redirecting element, and works in conjunction with the light guide plate and other optical components to achieve both polarization control and light recycling, thereby improving optical efficiency while limiting the increase in structural complexity
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 enhances optical efficiency by reducing light losses during polarization filtering and recycling light, ensuring that more light is emitted with the desired RGB colors, thereby improving the display's brightness and color accuracy.
Implementation Method 1
a color filter disposed on a surface of the second polarization layer from which the second polarized component exits, the color filter comprising a quantum dot layer configured to filter light having preset colors out of the second polarized component exiting the second polarization layer
Implementation Method 2
a first polarization layer disposed on a first surface of the liquid crystal panel and configured to transmit a first polarized component of the light emitted from the light source
Implementation Method 3
a second polarization layer disposed on a second surface of the liquid crystal panel opposed to the first surface and configured to transmit a second polarized component of light emitted from the liquid crystal panel
Implementation Method 4
a light compensation layer interposed in between the second polarization layer and the color filter, the light compensation layer may be configured to reflect a preset polarized component of light traveling from the color filter toward the second polarization layer toward the color filter
Data Source
AI summary
Disclosed is a display apparatus a display of which includes a liquid crystal panel; a light source configured to emit light toward the liquid crystal panel; a first polarization layer disposed on a first surface of the liquid crystal panel and configured to transmit a first polarized component of the light emitted from the light source; a second polarization layer disposed on a second surface of the liquid crystal panel opposed to the first surface and configured to transmit a second polarized component of light emitted from the liquid crystal panel; and a color filter disposed on a surface of the second polarization layer from which the second polarized component exits, the color filter comprising a quantum dot layer configured to filter light having preset colors out of the second polarized component exiting the second polarization layer.