Transparent Display Gamma Curve Adjustment for Bright Environments
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Solution Overview
Problem
Conventional transparent display devices face issues with image clarity due to tone changes caused by external light, as they do not effectively utilize the luminance of incident light and transmittance of the display panel, leading to decreased image perception in bright environments.
Innovation Solution
A transparent display device that calculates perception luminance based on incident light luminance and transmittance, and adjusts the application gamma curve using a reference gamma value and perception luminance to optimize image display, reducing tone changes and maintaining image clarity across varying light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional gamma curve (e.g., 2.2) is used for transparent display, then the display is compatible with general environments, but image clarity decreases in bright environments due to tone changes caused by external light
Solution Approach 1:
The patent implements dynamic gamma curve adjustment by calculating perception luminance based on incident light luminance and panel transmittance, then selecting or interpolating an appropriate gamma curve from multiple predefined curves (e.g., 1.8, 2.2, 2.4, 2.6). This allows the display to adapt its gamma characteristics in real-time according to ambient lighting conditions, resolving the contradiction between general compatibility and bright environment performance
Solution Approach 2:
The system changes the gamma curve parameter based on calculated perception luminance values. By computing perception luminance using the formula Lper = {α·Lsti+β}·{γ·log(Lsti/Lbg)+1} where Lsti is stimulation luminance and Lbg is background luminance, the system selects optimal gamma parameters that maintain image clarity across different lighting conditions while preserving compatibility where appropriate
2Illumination intensity
If panel luminance is adjusted according to ambient brightness, then some adaptation to external light is achieved, but image perception remains limited because incident light luminance and transmittance are not utilized
Solution Approach 1:
The system employs feedback by measuring incident light luminance (via sensor or estimation) and known panel transmittance characteristics to calculate perception luminance. This calculated perception luminance then feeds back into the gamma curve selection process, creating a closed-loop system that optimizes image perception quality based on actual viewing conditions rather than simply adjusting panel luminance in open-loop manner
Solution Approach 2:
The patent performs preliminary calculation of perception luminance using the formula Lper = {α·Lsti+β}·{γ·log(Lsti/Lbg)+1} before displaying the image. By pre-calculating the appropriate perception luminance based on incident light and transmittance, the system can select the optimal gamma curve in advance, ensuring high image perception quality from the start rather than attempting post-adjustment
Data Source
AI summary
A transparent display device includes a transparent display panel which displays an image, a scan driver which provides a scan signal to the transparent display panel, a data driver which converts image data into a data signal based on an application gamma curve, and which provides the data signal to the transparent display panel, a timing controller which controls the scan driver and the data driver, a luminance value compensator which calculates a perception luminance of the transparent display panel based on a luminance of incident light that is incident on the transparent display panel and a transmittance of the transparent display panel, and a gamma curve adjuster which adjusts the application gamma curve based on a reference gamma value of a reference gamma curve and the perception luminance of the transparent display panel.