Flat Panel Display Tilt Angle Sensing via Dual Photosensors
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Solution Overview
Problem
Existing flat panel displays lack an effective method to accurately determine the tilt angle, which affects the amount of light incident and perceived by sensors, impacting image quality and backlight adjustment.
Innovation Solution
A flat panel display design incorporating a first and second sensing unit on non-emission regions, with a light shielding member adjacent the second photosensor, allowing for the determination of tilt angle by comparing light intensities measured by both units, and utilizing a look-up table to correlate intensity ratios with tilt angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single photosensor is used to sense external light, then the structure is simple, but the tilt angle cannot be determined accurately
Solution Approach 1:
The sensing function is segmented into multiple photosensors (first and second photosensors) positioned at different locations on the non-emission region. Each photosensor measures light intensity independently, and the controller compares these measurements to determine tilt angle, thereby achieving accurate tilt detection while maintaining relatively simple individual sensor structures
Solution Approach 2:
The first and second photosensors are positioned asymmetrically relative to the emission region, with the second photosensor located closer to the emission region than the first photosensor. This asymmetric arrangement creates differential light intensity measurements that directly correlate with tilt angle, enabling accurate tilt detection without requiring complex sensor assemblies
2Reliability
If tilt angle determination is added to the display system, then image quality and backlight adjustment improve, but device complexity increases
Solution Approach 1:
The photosensors serve multiple functions: they detect external light intensity for ambient light sensing and simultaneously detect changes in light intensity caused by tilt angle changes. The controller processes these signals to determine both ambient light levels and tilt angle, eliminating the need for separate tilt sensors and reducing overall device complexity while improving image quality and backlight adjustment
Solution Approach 2:
The display system uses its own structural components (the non-emission region and existing photosensors) to perform tilt angle detection. The non-emission region naturally provides the asymmetric positioning needed for tilt sensing, and the photosensors automatically detect both light intensity and tilt information without requiring additional dedicated tilt sensing components
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
Enables accurate calculation of tilt angles without additional sensors, improving light management and image quality by adjusting backlight intensity based on measured light intensities, thereby enhancing display performance.
Implementation Method 1
Photosensors that convert light signals to electric signals are being developed to provide various functions
Data Source
AI summary
A flat panel display including a first substrate comprising an emission region and a non-emission region, a light emission unit on the emission region, a first sensing unit on the non-emission region, and a second sensing unit on the non-emission region, wherein the first and second sensing units are arranged to allow determination of a tilt angle of the flat panel display using light intensities measured by the first and second sensing units.