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Display system and lighting device used therein

A technology for lighting devices and light-emitting elements, which is applied in the parts of lighting devices, lighting devices, lighting and heating equipment, etc., can solve problems such as increasing the number of photoelectric conversion elements.

Inactive Publication Date: 2009-07-01
HITACHT MAXELL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, to detect the amount of light emitted by each LED with high precision, it is necessary to increase the number of photoelectric conversion elements
Therefore, new issues will arise in terms of increase in component cost, arrangement method, and heat dissipation

Method used

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  • Display system and lighting device used therein
  • Display system and lighting device used therein
  • Display system and lighting device used therein

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0021] figure 1 It is a block diagram showing an illumination device according to an embodiment of the present invention. figure 2 It is an arrangement diagram showing an example of an arrangement method of a plurality of light-emitting elements in the lighting device of the present invention. image 3 It is a waveform diagram showing the operation sequence and operation status of each processing unit.

[0022] Here, a case of an LED is shown as a light emitting element shown in this embodiment. In addition, in this embodiment, the luminous efficiency and luminous amount as the luminous performance of the LED are not limited in any way, and any performance may be used as long as the luminous amount required for the device can be obtained. In addition, in this embodiment, the wavelength components of the light emitted by the LED are not particularly limited, as long as it is configured to obtain certain color components such as white components, red, blue, and green, etc. ac...

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Abstract

The present invention provides an illuminating device and a display device using the same. In the drive circuits of multiple groups of light emitting element arrays each having at least one light emitting element, at least one light emitting element array has a different phase from other light emitting element arrays. Perform pulse drive. The processing circuit, when at least one of the light-emitting element arrays driven with different phases is turned off, uses the turned-off at least one light-emitting element array as a light-receiving element, and obtains the light emission amounts of the other light-emitting element arrays that are emitting light. Furthermore, the control circuit controls the drive level of the drive circuit corresponding to the light emitting element array that is emitting light based on the obtained light emission amount.

Description

technical field [0001] The present invention relates to an image display device for forming an image by irradiating light beams from a light source to an image display element such as a transmissive or reflective liquid crystal panel or a micro mirror, and in particular to an illumination device as a light source used in the display device. Background technique [0002] In recent years, with the improvement of the luminous efficiency of light emitting diodes (hereinafter abbreviated as LED (Light Emitting Diode)), the application to high-brightness lighting devices has achieved surprising development. However, LEDs have large variations in luminous efficiency due to deterioration of performance over time, or variations in luminous efficiency among LED elements. Therefore, methods and the like for maintaining uniform light emission characteristics have been proposed and put into practical use. [0003] For example, in the projection display device described in JP-A-2004-2968...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32H05B33/08H05B33/14F21V23/00H05B44/00
CPCY02B20/346Y02B20/46
Inventor 小堀智生大内敏今长谷太郎丸山敦
Owner HITACHT MAXELL LTD