Transparent LCD Timing Controller for Low Ambient Brightness
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Solution Overview
Problem
Transparent liquid crystal display apparatuses face limitations in display quality due to low maximum brightness when ambient light is weak, as they rely on ambient light rather than additional light sources like backlights.
Innovation Solution
A transparent liquid crystal display apparatus that includes a timing controller, brightness sensor, and lookup tables to analyze and process image data based on ambient light conditions, adjusting the dynamic range of output image data to improve visibility by applying a weight factor and using lookup tables to map input to output brightness levels, thereby enhancing display quality even in low ambient light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent liquid crystal display apparatus uses ambient light as a light source, then the display apparatus can transmit light through the transparent display panel, but the maximum brightness is limited by the ambient light and display quality deteriorates when ambient light is weak
Solution Approach 1:
The patent applies dynamics by making the image processing parameters adjustable based on ambient light conditions. The timing controller dynamically adjusts the dynamic range of output image data according to the sensed ambient brightness, transforming the static display system into an adaptive one that responds to environmental changes.
Solution Approach 2:
The patent changes parameters by modifying the dynamic range of output image data based on ambient light intensity. When ambient light is weak, the system adjusts the brightness parameters and uses lookup tables to map input brightness levels to optimized output levels, thereby improving display quality without requiring additional light sources.
2Reliability
If the timing controller processes image data with dynamic range adjustment based on ambient brightness, then the visibility and display quality improve in low ambient light, but the device complexity increases
Solution Approach 1:
The timing controller performs multiple functions: it receives input image data, converts RGB to YCbCr color space, extracts histograms, analyzes grayscale distribution, and generates output image data with adjusted dynamic range. By consolidating these functions in a single controller, the patent avoids adding separate processing units, thereby limiting the increase in device complexity.
Solution Approach 2:
The system uses the ambient brightness information sensed by the display apparatus itself to automatically adjust the image processing parameters. The timing controller self-regulates the dynamic range adjustment based on the sensed ambient light conditions, eliminating the need for external control systems or manual intervention.
Data Source
AI summary
A method of driving a transparent liquid crystal display apparatus includes a transparent display panel including a brightness sensor and a timing controller. The timing controller includes a YCbCr converter configured to convert input pixel data to YCbCr data, a histogram extractor configured to receive the YCbCr data and generate histogram information about the number of values corresponding to each of brightness data, a grayscale analysis unit configured to analyze the histogram information and determine a type of an input image, an image processer configured to process the YCbCr data according to the type of the input image and the ambient brightness information and generate an output YCbCr′ data, and an RGB converter configured to convert the output YCbCr′ data to output image data.