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Light Emitting Device And Image Display Apparatus

A light-emitting device and light-emitting element technology, applied in optics, lasers, optical elements, etc., can solve the problems of increased luminous output, luminous output beyond the expected range, and reduced luminous output.

Inactive Publication Date: 2015-05-27
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the display device described in Patent Document 1, although the luminous output can be prevented from greatly decreasing, the luminous output cannot be prevented from greatly increasing.
Therefore, if the current becomes too large due to a defect in the current supply circuit, etc., the luminous output may exceed the expected range.

Method used

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  • Light Emitting Device And Image Display Apparatus
  • Light Emitting Device And Image Display Apparatus
  • Light Emitting Device And Image Display Apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach 》

[0127] Next, a first embodiment of the light emitting device of the present invention will be described.

[0128] Figure 6 is a perspective view showing a schematic configuration of a first embodiment (light source) of the light emitting device of the present invention, Figure 7 is showing Figure 6 Circuit diagram of an example of the connection of the light-emitting device to the power supply shown. Also, in the following description, the Figure 6 The upper part in the figure will be described as "upper", and the lower part will be described as "lower".

[0129] The aforementioned light sources 311R, 311G, and 311B are each constituted by an embodiment of the light emitting device of the present invention.

[0130] Figure 6 The illustrated light emitting device 9 includes a light emitting element 91 , a temperature variable resistance element 92 , a mount 93 , and a mounting substrate 94 .

[0131] Additionally, if Figure 7 As shown, the light emitting element 91...

no. 2 approach 》

[0168] Next, a second embodiment of the light emitting device of the present invention will be described.

[0169] Figure 9It is a perspective view showing the second embodiment of the light emitting device of the present invention.

[0170] Hereinafter, the second embodiment will be described. In the following description, differences from the above-mentioned first embodiment will be mainly described, and descriptions of the same items will be omitted. In addition, in the figure, the same code|symbol is attached|subjected to the same structure as the said embodiment. In addition, in Figure 9 In , illustration of the mounting substrate 94 is omitted.

[0171] The second embodiment is the same as the first embodiment except that the shape of the temperature variable resistance element 92 is different.

[0172] Such as Figure 9 As shown, the temperature variable resistance element 92 according to the second embodiment has a planar shape in which the terminal electrode 92...

no. 3 approach 》

[0179] Next, a third embodiment of the light emitting device of the present invention will be described.

[0180] Figure 10 It is a perspective view showing a third embodiment of the light emitting device of the present invention.

[0181] Hereinafter, the third embodiment will be described, and in the following description, the differences from the first and second embodiments described above will be mainly described, and the description of the same matters will be omitted. In addition, in the figure, the same code|symbol is attached|subjected to the same structure as the said embodiment. In addition, in Figure 10 In , illustration of the mounting substrate 94 is omitted.

[0182] The third embodiment is also the same as the second embodiment except that the shape of the temperature variable resistance element 92 is different.

[0183] Such as Figure 10 As shown, the temperature variable resistance element 92 according to the third embodiment has a planar shape in whi...

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Abstract

A light emitting device includes: a light emitting element; and a temperature variable resistive element which is connected to the light emitting element in parallel and is provided so that heat of the light emitting element can be conducted, wherein the temperature variable resistive element has a characteristic in which a resistance value decreases as a temperature increases.

Description

technical field [0001] The present invention relates to a light emitting device and an image display device. Background technique [0002] A head-mounted display (HMD) is known as a display device that directly irradiates laser light to the retina of the eye so that a user can visually recognize an image. [0003] A head-mounted display generally includes: a light emitting device that emits light; and a scanning unit that changes an optical path so that the emitted light scans the user's retina. With such a head-mounted display, for example, the user can visually recognize both the external scenery and the image drawn by the scanning unit at the same time. [0004] However, in such a head-mounted display, since the light emitted from the light emitting device irradiates the retina, it is necessary to consider that the retina is not damaged by the light. In general, the output of the light emitting device is limited so that the light quantity of light emitted from the light...

Claims

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Application Information

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IPC IPC(8): G02B27/01
CPCG02B27/017H01S5/02476H01S5/0261H01S5/06825G02B27/0172
Inventor 池上富雄
Owner SEIKO EPSON CORP
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