Adjustable Light Intensity Direction in Display Devices
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Solution Overview
Problem
Existing display devices experience varying brightness at different viewing angles, leading to inefficient power consumption and reduced light source lifespan due to the need for increased light source driving current.
Innovation Solution
A display device with an adjustment panel that includes a medium layer with a first and second substrate, electrode layers, and polyhedral structures, which forms an equivalent dioptric structure when a voltage difference is applied, deflecting collimated light to adjust brightness directionally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source driving current is increased to enhance brightness at different viewing angles, then the brightness uniformity is improved, but the power consumption increases and the light source lifespan is shortened
Solution Approach 1:
The patent segments the backlight unit into multiple independent light emitting groups, each controlled by separate electrode layers. This allows different viewing angle regions to receive appropriately directed light without requiring all light sources to operate at maximum intensity, thus reducing overall power consumption while maintaining brightness uniformity.
Solution Approach 2:
The patent applies local quality by creating region-specific light emission characteristics through the adjustment panel. Different areas of the display have customized light intensity directions tailored to their viewing angle requirements, eliminating the need for uniform high-power operation across the entire display and thereby reducing power consumption.
2Illumination intensity
If the light source driving current is increased to enhance brightness at different viewing angles, then the brightness uniformity is improved, but the light source lifespan is shortened
Solution Approach 1:
By dividing the backlight into multiple light emitting groups with independent control, the system can activate only the necessary groups for current viewing conditions. This reduces cumulative operating hours and stress on individual light sources, extending their lifespan while maintaining brightness uniformity.
Solution Approach 2:
The localized light intensity direction control ensures that each region receives optimal illumination without requiring excessive overall brightness. This prevents premature degradation of light sources by operating them within optimal intensity ranges, thereby extending lifespan.
3Use of energy by moving object
If the light intensity direction is adjusted to concentrate peak light intensity within a small viewing angle range, then the power consumption is reduced, but the device complexity increases
Solution Approach 1:
The adjustment panel incorporates dynamically controllable electrode layers that can change the light intensity direction in real-time based on viewing conditions. This dynamic adaptability allows the system to concentrate light efficiently without requiring complex mechanical structures, reducing overall device complexity while achieving power savings.
Solution Approach 2:
The patent changes the optical parameters of the medium layer by applying voltage to the electrode layers, which modifies the refractive index and light propagation characteristics. This parameter-based control achieves precise light direction adjustment without adding mechanical complexity, thereby reducing device complexity while lowering power consumption.
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 solution allows for uniform light distribution at different viewing angles, reducing power consumption and extending the life of the light source by concentrating peak light intensity within a small viewing angle range.
Implementation Method 1
At least one equivalent dioptric structure is formed in the medium layer according to the electric field distribution. At least part of the collimated light passes through the equivalent dioptric structure and emits along a predetermined light emitting direction deflected from the propagation direction
Implementation Method 2
When the adjustment panel is in a first enabled state, a voltage difference exists between the first substrate and the second substrate to form an electric field distribution
Data Source
AI summary
A display device includes a display module emitting collimated light along a propagation direction and an adjustment panel disposed on the display module. The adjustment panel includes a first substrate, a second substrate, a medium layer disposed between the first substrate and the second substrate, a first electrode layer disposed on the first substrate, and a second electrode layer disposed on the second substrate and facing the first electrode layer. The medium layer includes a first medium. When the adjustment panel is in a first enabled state, a voltage difference exists between the first substrate and the second substrate to form an electric field distribution. At least one equivalent dioptric structure is formed in the medium layer according to the electric field distribution. At least part of the collimated light passes through the equivalent dioptric structure and emits along a predetermined light emitting direction deflected from the propagation direction.