Transparent Display Gradation Control for Luminance Uniformity
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Solution Overview
Problem
Existing transparent displays 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 system with a signal processing circuit that adjusts gradation values based on environmental illuminance and background luminance, using adjustment coefficients to optimize luminance uniformly across the display area, and includes a camera and illuminance sensor to measure and adjust pixel gradation values accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light enters from the side surface of the display panel to enable transparent display, then the background can be visually recognized through the display area, 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 displaying images, multiplying each pixel's gradation value by a corresponding adjustment coefficient to compensate for the expected light attenuation, thereby achieving uniform luminance distribution across the display surface
Solution Approach 2:
Different adjustment coefficients are applied to different regions of the display panel according to their specific light attenuation characteristics, with each pixel receiving a customized gradation adjustment based on its position and the light propagation path length
2Illumination intensity
If adjustment coefficients are applied to uniformize luminance across the display surface, then luminance uniformity improves, but the luminance decreases in the entire display surface independently of input images and surrounding conditions
Solution Approach 1:
The adjustment coefficients are made dynamic and adaptive rather than fixed, with the signal processing circuit determining appropriate coefficient values based on real-time detection of background luminance by the camera and environmental illuminance by the illuminance sensor, allowing the system to optimize between uniformity and overall luminance level according to actual conditions
Solution Approach 2:
The system changes the parameters of the adjustment coefficients based on detected environmental conditions and background luminance, modifying the multiplication factors dynamically to maintain both luminance uniformity and adequate overall luminance level across different operating scenarios
3Illumination intensity
If fixed adjustment coefficients are used to compensate for light attenuation, then luminance uniformity is improved, but the display cannot optimize luminance according to input images and surrounding conditions
Solution Approach 1:
The system incorporates feedback mechanisms where the camera detects background luminance and the illuminance sensor measures environmental illuminance, and this detected information is fed back to the signal processing circuit to dynamically adjust the adjustment coefficients, enabling continuous optimization of luminance uniformity and overall luminance level
Solution Approach 2:
The display system performs self-adjustment by automatically detecting its operating conditions through integrated sensors and autonomously optimizing the gradation values through the signal processing circuit, eliminating the need for manual calibration or external intervention
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 system achieves uniform luminance across the display surface, enhancing image quality by optimizing luminance based on input images and environmental conditions, regardless of image brightness or background luminance.
Implementation Method 1
a liquid crystal layer containing polymer-dispersed liquid crystal
Implementation Method 2
a display panel that has a display area provided with a plurality of pixels arrayed in a first direction and a second direction intersecting the first direction and is provided with an electrochromic layer configured to make a background of the display area invisible
Data Source
AI summary
According to an aspect, a display system includes: a display panel having a display area provided with pixels and configured to allow a user to visually recognize a background transmitted through the display area; a light source configured to emit light toward a side surface of the display panel; a signal processing circuit configured to generate input gradation values and output 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; an illuminance sensor; and a camera. The signal processing circuit is configured to output the first gradation values when average luminance of the background image is a first predetermined value or larger and illuminance acquired by the illuminance sensor is a second predetermined value or larger.