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Systems and methods for projector light beam alignment

A technology for projectors and light beams, applied in the field of systems and methods for beam alignment of projectors, capable of solving problems such as imperfect mechanical manufacturing, misalignment, and laser diode misalignment of projector systems

Inactive Publication Date: 2014-11-12
INTERSIL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, there will be some inherent misalignment caused by the imperfect mechanics of the projector system
In addition, misalignment may occur due to mechanical changes in the projector system (for example, if the projector system is dropped)
In addition, thermal changes in the laser diode and aging of the laser diode can cause misalignment

Method used

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  • Systems and methods for projector light beam alignment
  • Systems and methods for projector light beam alignment
  • Systems and methods for projector light beam alignment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] Various causes of laser beam (or light beam) misalignment are described above. Embodiments of the invention described herein can be used to detect and compensate for all of the aforementioned causes of misalignment.

[0034] refer to Figure 2B The timing diagram depicts an exemplary laser beam misalignment, Figure 2B represents the observed timing (as opposed to the timing of the data sent from the controller 104 to the LDD 108 ) relative to the image being displayed. More specifically, Figure 2B The attempt shows that the blue laser is shifted one pixel (or close to one) to the right hand side (RHS), resulting in a color shift in the displayed image. This can also be obtained from Figure 2C As seen in , by using the equation X_Offset=(A+C)-(B+D), Figure 2C Exemplary signals representing horizontal laser beam alignment for red, green, and blue laser diodes are shown, and this and other equations are explained in more detail below.

[0035] refer to image 3 ...

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PUM

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Abstract

Embodiments of the present invention generally relate to circuits, systems and methods that can be used to detect light beam misalignment, so that compensation for such misalignment can be performed. In accordance with an embodiment, a circuit includes a photo-detector (PD) having a plurality of electrically isolated PD segments. Additionally, the circuit has circuitry, including switches, configured to control how currents indicative of light detected by the plurality of electrically isolated PD segments are arithmetically combined. When the switches are in a first configuration, a signal produced by the circuitry is indicative of vertical light beam alignment. When the switches are in a second configuration, the signal produced by the circuitry is indicative of horizontal light beam alignment. The signals indicative of vertical light beam alignment and horizontal light beam alignment can be used detect light beam misalignment, so that compensation for such misalignment can be performed.

Description

[0001] priority claim [0002] This application claims priority to the following U.S. patent applications: [0003] U.S. Patent Application 12 / 868,363, entitled "SYSTEMS AND METHODS FORPROJECTOR LIGHT BEAM ALIGNMENT," filed August 25, 2010; and [0004] • US Provisional Patent Application 61 / 296,987, entitled "SYSTEMS AND METHODS FORPROJECTOR LASER BEAM ALIGNMENT," filed January 21, 2010, both applications being incorporated herein by reference. technical field [0005] Embodiments of the invention generally relate to circuits, systems and methods that can be used to detect beam misalignment so that compensation for such misalignment can be performed. Background technique [0006] figure 1 An exemplary small projector display device 100, sometimes referred to as a pico projector, is shown. The compact projector device 100 can be integrated with or attached to the following portable devices: a mobile phone; a smart phone; a portable computer (such as a laptop or netbook); ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/14G03B21/00H04N5/74H04N9/31
CPCH04N5/74G03B21/28H04N9/3194H04N9/3129G03B21/14A44C25/00H04M1/0274
Inventor D·钱伯林D·郑
Owner INTERSIL INC