Interactive polarization-preserving projection display

A polarization-maintaining and interactive technology, applied in the field of input information, which can solve the problems of environmental signal interference and shielding of input signals.

Inactive Publication Date: 2013-07-03
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, active devices are available that can provide a clear and strong input signal, while simple passive devices can suffer from ambient signal interference, obscuring the intended input signal

Method used

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  • Interactive polarization-preserving projection display
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  • Interactive polarization-preserving projection display

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0091] Example 1: Interactive Display with Polarization Selection Screen

[0092] Interactive displays may include projectors with visible output. The visible output can be projected on a polarization maintaining reflective screen. Infrared Light The polarization preserving screen may be illuminated with p-polarized infrared light invisible to humans. P-polarized infrared light can be generated with infrared light emitting diodes (LEDs) and polarizing films (eg, reflective polarizers, absorbing polarizers, etc.). The reflective polarizer film can be any known reflective polarizer, such as a MacNeille polarizer, a wire grid polarizer, a multilayer optical film polarizer, or a circular polarizer such as a cholesteric liquid crystal polarizer. An infrared sensor, such as an infrared-sensing camera that detects a bright infrared spot, is pointed at the polarization-maintaining screen. Infrared sensors can be retrofitted from digital signal processing (DSP) "Wii" remote or w...

example 2

[0095] Example 2: Interactive display without polarization maintaining screen

[0096] The same configuration as presented in Example 1 was used, but the polarization maintaining screen was replaced by a diffusing screen (eg a diffusing wall surface). Alternatively, as described in Example 1, a polarization maintaining retroreflective marker was used.

[0097] Project the visible keypad onto a diffuse wall. Infrared cameras cannot sense visible images, making them immune to projected images. The image field on the wall is also filled with infrared light. The illuminating infrared light is largely diffusely reflected by the wall, and has a mixed polarization state, which allows the infrared camera to sense very little infrared illumination. Due to the polarization analyzer arranged above the infrared camera, any unwanted ambient infrared illumination is typically reduced in half. Thus, an infrared sensor detects a generally dark field with no bright infrared spots. A ret...

example 3

[0098] Example 3: Interactive Display with Dual Retroreflective Markers

[0099] The same configuration was used as provided in Example 2, but with an additional infrared illuminator to flood the polarization maintaining screen with horizontally polarized light. The two infrared illumination sources can be independently activated as required. In some cases, it can be used to quickly alternate between various infrared illumination states. States may include vertically polarized infrared illumination only, horizontally polarized infrared illumination only, simultaneous horizontal and vertical infrared illumination, and non-intentional infrared illumination. It may be useful to quickly sequence multiple infrared illumination states to achieve a sensing speed that is considered substantially instantaneous or simultaneous. Each of the several sensors may include a polarization analyzer oriented to a different polarization direction such that each sensor detects a signal only wh...

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PUM

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Abstract

The disclosure generally relates to optical devices, such as interactive displays, and in particular to interactive projection displays having passive input devices. The present disclosure also provides a passive interactive input device having the ability to overcome problematic ambient interference signals in an interactive display, such as an interactive projection display.

Description

[0001] Related Patent Applications [0002] This patent application is related to the following US patent application, "Interactive Polarization-Selective Projection Display," (Attorney Docket No. 66945US002), filed on the same date as this application, which is hereby incorporated by reference. Background technique [0003] Commercially available interactive projection systems such as "smart whiteboards" typically use handheld input devices to interact with the projected image. Such handheld input devices may include active infrared, ultrasonic and / or RF transmitters and / or receivers. These input devices are used to position the device relative to the projected image and can also be used to activate signals to cause changes in the projected image. Such input devices may be in the shape of, for example, markers or pens. [0004] Active input devices may typically include light generating devices, while passive devices reflect or absorb light generated elsewhere. Active inp...

Claims

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Application Information

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IPC IPC(8): G06F3/042H04N9/31
CPCG06F3/0425G02B27/286G06F3/0308
Inventor 罗纳德·D·杰斯密克雷格·R·沙尔特
Owner 3M INNOVATIVE PROPERTIES CO
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