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Lighting and Display Devices

A technology for lighting devices and display devices, applied in projection devices, color photography, optics, etc., can solve problems such as lowered display image quality and uneven illumination brightness, so as to improve display image quality, reduce the generation of interference patterns, Effect of suppressing brightness unevenness

Inactive Publication Date: 2015-10-28
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the brightness of the illumination light tends to become very uneven
This results in a reduction in the quality of the displayed image

Method used

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  • Lighting and Display Devices
  • Lighting and Display Devices
  • Lighting and Display Devices

Examples

Experimental program
Comparison scheme
Effect test

Deformed example 2

[0066] Modification 2 (in this example, the emission frequency includes multiple frequency components)

[0067] Modification 3 (In this example, the relationship between the vibration frequency and the frequency of change in the luminance of illumination light is considered)

[0068] Modification 4 (in this example, the control unit dynamically controls the light emission frequency and the vibration frequency)

[0069] Modification 5 (In this example, a diffractive element is used as an optical element)

[0070] Modification 6 (In this example, a liquid crystal element is used as an optical element and the liquid crystal element is electrically vibrated)

[0071] Modification 7 (in this example, white noise is considered in terms of brightness unevenness)

[0072] Other modifications

[0073] 1. Embodiment

[0074] The overall structure of the display device 3

[0075] figure 1 The overall structure of the display device (display device 3 ) of the embodiment of the pres...

Deformed example 1

[0191] In the above example, if Figure 17 As shown in parts (A) and (C) of , assume a situation where the light-emitting waveform (rectangular wave) formed by the laser beam rises sharply, and only high-frequency waveforms are generated. Odd multiples of the frequency. But in many cases, such as Figure 17 As shown in parts (B) and (D) of , the light emission waveform formed by the laser beam may be rounded at its rising edge due to the response speed of the liquid crystal, etc. In addition, in the above-mentioned embodiments, for example, as Figure 17 As shown in parts (A) and (B) of , the light emission waveforms generated by the respective laser light sources 11R, 11G, and 11B are set to have a duty ratio of 50%. But in practice it is more common, for example, as Figure 17 As shown in parts (C) and (D) of , the light emission waveforms generated by the respective laser light sources 11R, 11G, and 11B are set to have a duty ratio of 33%.

[0192] When the light-emitt...

Deformed example 3

[0197] The above description has been made on the assumption that the vibration frequency f0 of the optical element 14 is equal to the luminance change frequency f2 of the illumination light (the luminance change frequency of the illumination light due to the vibration of the optical element 14). In practice, however, the vibration frequency f0 is often different from the variation frequency f2. For example Figure 19 As shown in parts (A) and (B) of , if the optical element 14 is composed of a one-dimensional cylindrical lens array, and the vibration amplitude of the optical element 14 corresponds to twice its frequency, then one of the optical elements 14 The flicker frequency (or change frequency f2 ) of the brightness distribution generated over the vibration period corresponds to four times the vibration frequency f0 ( f2 =4×f0 ).

[0198] Basically, the vibration frequency f0 represents the flicker frequency of the luminance distribution. Then, in this case, the follow...

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Abstract

An illumination device includes: a light source section including a laser light source, and allowing a laser light beam emitted from the laser light source to be outputted intermittently at a predetermined frequency; an optical element through which the laser light beam passes; and a driver section changing a coherency of the laser light beam by driving the optical element at a predetermined drive frequency. Expressions (1) |2×f2−n1×f1|≧20 or (2) |2×f2−n2×f1|≰3, (3) f2≧20 or (4) f2≰3, and (5) |f2−n1×f1|≧20 or (6) |f2−n3×f1|≰3 are satisfied, where f1 denotes the frequency in Hz, f2 denotes a variation frequency of luminance in illumination light outputted from the optical element in Hz, the variation frequency being generated by the driving of the optical element, n1 denotes an arbitrary integer of 0 to 10 both inclusive, and n2 and n3 denote respective predetermined integers of 0 to 10 both inclusive.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to that disclosed in Japanese Priority Patent Applications JP2011-154592 and JP2011-273555 filed with the Japan Patent Office on July 13, 2011 and December 14, 2011, respectively, and these two The entire content of the priority patent application is incorporated herein by reference. technical field [0003] The present invention relates to a lighting device that emits light (including emitting laser light) and a display device that displays images using the lighting device. Background technique [0004] Generally, a projector (or projection display device) includes an optical module as a main component, and the optical module is composed of an illumination optical system (or illumination device) including a light source and a projection optical system (or projection optical system) including a light modulation element . In the field of such projectors, in recent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/20G03B21/00G02B27/48
CPCG02B27/48G03B21/2033G03B21/208G03B33/08H04N9/3129H04N9/3155
Inventor 安井利文矶部裕史高桥一幸
Owner SONY CORP