Display device

A technology of display device and display range, applied in control device, static indicator, transportation and packaging, etc., can solve the problems of light source threshold current value change, image brightness instability, etc., and achieve the effect of stable light output

Inactive Publication Date: 2013-07-24
NIPPON SEIKI CO LTD
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

[0006] However, the threshold current value of the light source changes due to factors such as heat generated when the light source emits light, and changes in the outside air temperature.
When the threshold current value of the light source changes like this, the current-light output characteristic of the light source changes, so there is a problem that the luminance of the displayed image is unstable.

Method used

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Embodiment Construction

[0034] An embodiment of the present invention applied to the head-up display device 1 will be described below with reference to the drawings.

[0035] The head-up display device 1 is installed in the dashboard of the vehicle 2, and reflects the display light L through the windshield 3, and the display light L displays the formed display image D, whereby the driver 4 visually recognizes the display displaying vehicle information. A virtual image V of image D. The driver 4 can visually recognize the virtual image V without losing sight from the front.

[0036] picture figure 2 As shown, the head-up display device 1 includes a synthetic laser generator (laser light source) 10; a MEMS scanner (scanning mechanism) 20; a transparent screen (screen) 30; a color sensor (laser detection unit) 40; a reflection unit 50; Light sensor (external light detection unit) 60 ; housing 70 .

[0037] Synthetic laser generator 10 synthesizes the laser light R, G, B of three primary colors, emit...

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Abstract

A display device capable of obtaining stable light output even in a state of low brightness and capable of displaying desired display colors is provided. An output control means (80) causes image-forming light to be emitted from a laser source (10) on the basis of image information when the scanning position of an RGB laser beam according to a scanning means (20) is within a display range, and causes detection light to be emitted from the laser source (10) when the scanning position is outside the display range. In addition, the output control means (80) changes the drive current of the laser source (10) according to a first current value that is less than a threshold current value, and second and third current values that are greater than or equal to the threshold value, when the scanning position according to the scanning means (20) is outside the display range; and drives the laser source (10) according to the drive current obtained by calculating the current-light output characteristics on the basis of the light intensity detected by a laser beam detection unit (40).

Description

technical field [0001] The present invention relates to a display device, and more particularly, to a display device that displays an image by optically scanning light emitted from a laser light source. Background technique [0002] In the past, various head-up display devices for vehicles have been proposed, which project a display image onto a translucent plate called a windshield or a combiner (combina) of a vehicle to display a virtual image, for example, in Patent Document 1 publicly. [0003] The vehicle head-up display device 1 is installed inside the instrument panel of the vehicle. The display light L projected by the vehicle head-up display device 1 is reflected to the vehicle driver 3 through the windshield 2, and the vehicle driver 3 can display the virtual image V with the street view. overlap for visual recognition (see figure 1 ). [0004] As such a vehicle head-up display device 1 , a type using a semiconductor laser as a light source has been proposed, fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/10B60K35/00G02B27/01
CPCB60K35/00G09G3/34G02B27/01B60K2350/2052G02B26/101B60K2350/2047H04N9/3194H04N9/3129B60K2370/333B60K2370/334
Inventor 关谷俊秦诚中原刚
Owner NIPPON SEIKI CO LTD
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