Transparent Display Gradation Compensation for Uniform Luminance
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Solution Overview
Problem
Existing transparent display devices experience luminance gradients due to light attenuation within the display panel, leading to non-uniform luminance across the display surface, which is not optimized for input images or surrounding conditions.
Innovation Solution
A display device with a signal processing circuit that generates gradation values based on input images and adjusts them using coefficients to compensate for light attenuation, ensuring uniform luminance by multiplying gradation values by an adjustment coefficient that corresponds to the attenuation of light within the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light enters from the side surface of the display panel, then the display allows visual recognition of the background on the other surface side, but luminance gradient occurs in the display surface due to light attenuation
Solution Approach 1:
The signal processing circuit performs preliminary adjustment on the gradation values before they are applied to the display pixels. By pre-calculating compensation values based on the luminance gradient characteristics, the system proactively counteracts the expected light attenuation, ensuring uniform luminance distribution across the display surface without requiring post-processing or physical modifications.
Solution Approach 2:
The system dynamically changes the gradation parameters of individual pixels based on their position in the display array. The signal processing circuit applies position-dependent adjustment coefficients to compensate for light attenuation, transforming the uniform input gradation values into non-uniform output values that result in uniform perceived luminance across the transparent display surface.
2Manufacturing precision
If the gradation value of each pixel is multiplied by a coefficient to uniformize luminance, then luminance uniformity improves, but the luminance in the entire display surface decreases independently of input images and surrounding conditions
Solution Approach 1:
The signal processing circuit implements dynamic luminance compensation by continuously adapting the adjustment coefficients based on the actual luminance characteristics of the display. Rather than applying fixed attenuation compensation, the system dynamically adjusts the gradation values to maintain both uniformity and appropriate overall luminance levels, responding to different input images and viewing conditions.
Solution Approach 2:
The system employs feedback mechanisms where the signal processing circuit monitors the luminance output and adjusts the gradation compensation accordingly. By using the actual luminance measurements and characteristics to refine the adjustment coefficients, the system ensures that luminance uniformity is achieved without unnecessary overall luminance reduction, maintaining optimal display quality under varying conditions.
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 achieves uniform luminance across the display surface, optimizing it for various input images and environmental conditions, enhancing display quality by maintaining or increasing luminance levels as needed.
Implementation Method 1
a liquid crystal layer containing polymer-dispersed liquid crystal
Data Source
AI summary
According to an aspect, a display device includes: a display panel having a display area in which a plurality of pixels are arrayed in a first direction and a second direction intersecting the first direction; a light source configured to emit light in the second direction toward a side surface of the display panel extending in the first direction; and a signal processing circuit configured to generate input gradation values corresponding to the pixels based on an input image and output, based on brightness of the input image, either first gradation values that are the input gradation values or second gradation values obtained by multiplying each of the input gradation values by an adjustment coefficient of 1 or smaller corresponding to attenuation of light propagating in the display panel.