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Compact image projection module

一种图像投影、投影的技术，应用在洗印装置、仪器、放映装置等方向，能够解决图像质量受损、图像投影系统实际尺寸和功率消耗高、扫描反射镜低扫描速率等问题，达到容易实现的效果

Inactive Publication Date: 2009-10-21
MICROVISION
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Problems solved by technology

However, known image projection systems have a limited resolution, which is typically less than 1 / 4 the quality of a Video Graphics Array (VGA) of 640 x 480 pixels
The physical size and power consumption of known image projection systems are quite high, making their use in miniaturized handheld battery-operated devices impractical
Additionally, the low scan rate of the scanning mirror produces annoying noise and vibration when in use
Speckle noise due to the coherent nature of laser beams is a common problem that compromises good image quality
In the case of color images formed by laser beams of different wavelengths (colors), some laser sources, such as red semiconductor single-mode lasers, do not have sufficient power to produce color images of uniform brightness, while other laser sources, such as green Optical lasers are not easy to implement

Method used

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Embodiment Construction

[0018] figure 1 Reference numeral 10 in generally denotes a hand-held device, such as a personal digital assistant, in which a light-weight, compact image projection module is installed, and is used to project two-dimensional images extending along longitudinal and lateral directions orthogonal to each other to the projection module On the separated projection plane 20. As an example, a near image may be at a location relatively close to the device, e.g., a few inches apart (approximately zero); and a far image may be at a location relatively far from the device, e.g., more than 20 feet apart (approximately zero); at infinity). Regardless of whether the projected image is near zero, near infinity, or at any distance in between, the resolution of the image is approximately constant, so the image is sharp and clear and focused to Any position within this extended distance.

[0019] The parallelepiped shape of the handheld device 10 represents a form factor for the housing in ...

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Abstract

A lightweight, compact image projection module, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality in monochrome, color or gray scale. Edge-emitting light emitting diodes are employed, together with mutually orthogonal cylindrical lenses, to render the module with a short, slim form factor.

Description

technical field [0001] The present invention generally relates to projecting monochrome, grayscale or color two-dimensional images, and in particular, the present invention relates to increased image brightness and reduced speckle noise while maintaining low power consumption and high resolution , miniaturized compact size, quiet operation and minimal vibration. Background technique [0002] It is known that a two-dimensional image can be projected onto a screen based on a pair of scanning mirrors which oscillate in mutually orthogonal directions and which scan a laser beam on a raster pattern. See, eg, US Patent No. 6,655,597. However, known image projection systems have a limited resolution, which is typically less than 1 / 4 the quality of a Video Graphics Array (VGA) of 640x480 pixels. The physical size and power consumption of known image projection systems are quite high, making their use in miniaturized hand-held battery-operated devices impractical. In addition, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/26G03B21/28G03B21/00G03B29/00G03B23/00
CPCG02B27/095G03B21/14G02B27/0933G03B29/00G02B27/0961G03B21/208
Inventor 德米特瑞·雅维德
Owner MICROVISION
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