TWI598717B - Laser dimming system - Google Patents

Description

Laser dimming system

The invention relates to a laser dimming system, in particular to a brightness control system capable of adjusting an image projected according to the brightness of an external environment.

US Patent No. 1,916,655 discloses a backlight adjustment system (Backlight Adjustment System). As shown in FIG. 1, the system has an ambient light sensor 170, a backlight sensor 171, and a temperature sensor 175. Next, a software driving device 190 transmits a signal to a current measuring device 200, and the current measuring device 200 calculates the current intensity transmitted from a power source 195, and reports it to the software driving device 190, and then transmits the software to the software driving device 190. The signal is supplied to the power source 195, and the power source 195 sends an appropriate amount of power to the current measuring device 200 to adjust the state of the backlight 120.

Taiwan Patent No. I462648 discloses a backlight driving circuit and a backlight driving method. Referring to FIG. 2, the prior art provides a power supply VS to the anode terminal of a light emitting diode unit 102 in a starting step S410. In step S420, a photosensitive element 104 senses ambient light, wherein the photosensitive element 104 is coupled between the cathode end of the LED unit 102 and the ground, and the resistance of the photosensitive element 104 follows the electronic device. Change the ambient light source, further step In step S430, the control circuit 105 adjusts the power source VS according to the feedback voltage VFB received by the sensing terminal to control the brightness of the LED unit 102.

In view of this, the inventor of the present invention has been engaged in the manufacturing development and design experience of related products for many years. After detailed design and careful evaluation of the above objectives, the present invention has finally become practical.

The object of the present invention is to provide a laser dimming system that automatically adjusts the brightness of an image with the intensity of the external ambient light, and the image brightness is moderate regardless of day or night, and does not cause glare or unclearness to the user. occur.

For the above purposes, the laser dimming system of the present invention comprises: an image processor; an ambient light sensor; a brightness mode determining circuit electrically connected to the ambient light sensor; a laser driving circuit, electrical Connecting the image processor; a laser light source electrically connecting the laser driving circuit and outputting a laser light; a brightness control module electrically connected to the brightness mode determining circuit, wherein the brightness control module comprises a brightness control a circuit, a liquid crystal and a polarizer; a scanning mirror driving circuit electrically connected to the image processor; and a microelectromechanical scanning mirror controlled by the scanning mirror driving circuit to reflect the laser light from the polarizer .

170‧‧‧ Ambient light sensor

171‧‧‧Backlight sensor

175‧‧‧temperature sensor

120‧‧‧ Backlight

190‧‧‧Software drive

200‧‧‧current measuring device

195‧‧‧Power supply

102‧‧‧Lighting diode unit

104‧‧‧Photosensitive elements

105‧‧‧Control circuit

VS‧‧‧ power supply

VFB‧‧‧ feedback voltage

S410~S430‧‧‧Steps

700‧‧‧Display body

710‧‧‧ Ambient light sensor

720‧‧‧Brightness mode decision circuit

730‧‧‧Brightness control module

731‧‧‧LCD

732‧‧‧ polarizer

733‧‧‧Brightness control circuit

740‧‧‧Microelectromechanical scanning mirror

750‧‧‧ image processor

760‧‧‧Scan mirror drive circuit

770‧‧‧Laser drive circuit

780‧‧‧Laser light source

800‧‧‧Diffuser

900‧‧‧Image combiner

S100‧‧‧ induction signal

S200‧‧‧Bright mode signal

S210‧‧‧Strong brightness mode signal

S220‧‧‧Weak brightness mode signal

S310‧‧‧First drive signal

S320‧‧‧second drive signal

S330‧‧‧ third drive signal

L110‧‧‧Laser light

L110’‧‧‧Laser light

L120‧‧‧projection intensity

L120’‧‧‧projection intensity

L121‧‧‧strong projection intensity

L122‧‧‧Weak projection intensity

Figure 1 is a prior art schematic.

Figure 2 is a schematic diagram of another prior art.

Figure 3 is a block diagram of the circuit of the present invention.

FIG. 4 is a schematic flow chart of Embodiment 1 of the present invention.

Figure 5 is a schematic flow chart of the second embodiment of the present invention.

Figure 6 is a block diagram of another embodiment of the present invention.

To further understand and understand the purpose, shape, structure and function of the present invention, the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 3, the present invention provides a laser dimming system having a display body 700. The display body 700 includes an ambient light sensor 710 that automatically detects the brightness of the external environment. Outputting a sensing signal S100 to a brightness mode determining circuit 720, the brightness mode determining circuit 720 outputs at least one brightness mode signal S200 to a brightness control module 730 according to the sensing signal S100, the brightness control module 730 includes a liquid crystal 731, A brightness control module 730 receives the brightness mode signal S200, and the brightness control circuit 733 controls the structure of the liquid crystal 731. The display body 700 includes an image processor 750. When the image processor 750 is activated, a first driving signal S310 is simultaneously outputted to a laser driving circuit 770 and a second driving signal S320 to a scanning mirror driving circuit 760, and the laser driving circuit 770 receives After the first driving signal S310, the output current starts a laser light source 780, and the laser light source 780 outputs an image of the laser light L110 to the brightness. The liquid crystal 731 of the module 730 is configured to adjust the arrangement of the structure through the brightness control circuit 733 when the liquid crystal 731 receives the brightness mode signal S200. After the laser light 110 is input to the liquid crystal 731, according to the brightness mode. The signal S200 outputs a projection intensity L120 of a different intensity to a polarizer 732, and the projection intensity L120 is adjusted by the polarizer 732 to output a projection intensity L120'; the scanning mirror driving circuit 760 outputs a third driving signal S330 and a microelectromechanical scanning mirror 740, which may be a MEMS, and the microelectromechanical scanning mirror 740 receives the projection intensity L120' output from the brightness control module 730, through the microelectromechanical scanning mirror 740 The projection intensity L120' is outputted to a diffuser 800, and the diffuser 800 reduces the spot of the projected image, and outputs the image to an image combiner 900, and further uses the image combiner 900 to display the image. The maximum brightness of the image is controlled by the brightness mode signal. For example, when the system includes two types of strong brightness mode signals and weak brightness mode signals, in the case of weak mode signals, the maximum brightness of the image is half of the maximum signal that the system can provide.

Embodiment 1

Referring to FIG. 4, in a strong light environment, the ambient light sensor 710 automatically detects the intensity of the light source, and outputs the sensing signal S100 to the brightness mode determining circuit 720. The brightness mode determining circuit 720 outputs a strong brightness. The mode signal S210 is applied to the brightness control module 730, and the brightness control circuit 733 controls the structure of the liquid crystal 731, and the received laser light L110 receives a strong projection intensity L121 from the brightness control module 730 to the MEMS. The scanning mirror 740 is then used to adjust the image through the diffuser 800 and the image combiner 900, and the information is clearly projected, so that the user can clearly see the projected information when the external light is sufficient.

Embodiment 2

Referring to FIG. 5, when ambient light is insufficient, the ambient light sensor 710 automatically detects the light source, and outputs the sensing signal S100 to the brightness mode determining circuit 720. The brightness mode determining circuit 720 outputs a weak brightness. The mode signal S220 is applied to the brightness control module 730, and the structure of the liquid crystal 731 is controlled by the brightness control circuit 733, and the received laser light L110 is outputted from the brightness control module 730 by a weak projection intensity L122 to the MEMS. Scanning mirror 740, then passing through diffuser 800 The image combiner 900 adjusts the image and clearly projects the information, so that the user does not feel the image is too glaring when the external light is insufficient.

Referring to FIG. 6 , the display body 700 of the present invention may be another aspect. The MEMS scanning mirror 740 may be disposed in front of the brightness control module 730 , and the laser light L110 is projected to the MEMS scanning mirror. 740. The MEMS scanning mirror 740 simultaneously receives the third driving signal S330, and outputs a laser light L110' to the liquid crystal 731 of the brightness control module 730 and the polarizer 732, and the brightness mode determining circuit 720 outputs the same. The brightness mode signal S200 controls the brightness control circuit 733 to determine the structure of the liquid crystal 731. When the laser light 710 is projected onto the liquid crystal 731, the brightness control module 730 projects through the different arrangement of the liquid crystal 731 structure. The projection intensity L120' will be different. Then, the brightness control module 730 outputs the projection intensity L120' to the diffuser 800, and further visualizes the image through the image combiner 900.

Further, the present invention can be applied to a head-up display of a car to sense the intensity of the ambient light outside the car, and automatically adjust the brightness of the image of the head-up display. The brightness of the display of the display is moderate during the day or night, and the driver is not glaring or unclear. The situation happened.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the invention are modified. All should remain within the scope of this creation patent.

700‧‧‧Display body

710‧‧‧ Ambient light sensor

720‧‧‧Brightness mode decision circuit

730‧‧‧Brightness control module

731‧‧‧LCD

732‧‧‧ polarizer

733‧‧‧Brightness control circuit

740‧‧‧Microelectromechanical scanning mirror

750‧‧‧ image processor

760‧‧‧Scan mirror drive circuit

770‧‧‧Laser drive circuit

780‧‧‧Laser light source

800‧‧‧Diffuser

900‧‧‧Image combiner

S100‧‧‧ induction signal

S200‧‧‧Bright mode signal

S310‧‧‧First drive signal

S320‧‧‧second drive signal

S330‧‧‧ third drive signal

L110‧‧‧Laser light

L120‧‧‧projection intensity

L120’‧‧‧projection intensity

Claims (8)

A laser dimming system includes: an image processor; a laser driving circuit electrically connected to the image processor; a laser light source electrically connected to the laser driving circuit and outputting a laser light; an ambient light The sensor detects an ambient light brightness; a brightness mode determining circuit electrically connects the ambient light sensor and outputs a brightness mode signal; and a brightness control module electrically connected to the brightness mode determining circuit, wherein the brightness is The control module includes a liquid crystal, a polarizer and a brightness control circuit, and the brightness control circuit controls the liquid crystal according to the brightness mode signal, and the polarizer transmits the light beam intensity of the laser light through the liquid crystal, and the light beam The intensity changes due to ambient light; a scanning mirror driving circuit electrically connected to the image processor; and a microelectromechanical scanning mirror controlled by the scanning mirror driving circuit to reflect the laser light from the polarizer, wherein the brightness The mode signal determines one of the maximum values of the beam intensity. The laser dimming system of claim 1, wherein the brightness mode signal determines a structure of the liquid crystal. The laser dimming system of claim 1, wherein the microelectromechanical scanning mirror is MEMS. The laser dimming system of claim 1, wherein the microelectromechanical scanning mirror projects the laser light onto a diffuser, projects it onto an image combiner, and then images it. A laser dimming system comprising: An image processor; an ambient light sensor for detecting an ambient light brightness; a brightness mode determining circuit electrically connected to the light sensor and outputting at least one brightness mode signal; a laser driving circuit electrically connecting the An image processor; a laser light source electrically connected to the laser driving circuit and outputting a laser beam; a scanning mirror driving circuit electrically connected to the image processor; and a microelectromechanical scanning mirror controlled by the scanning mirror driving circuit And scanning, and reflecting the laser light; and a brightness control module electrically connected to the brightness mode determining circuit, including a liquid crystal, a polarizer, and a brightness control circuit, wherein the brightness control circuit is based on the brightness mode signal The liquid crystal is controlled, and the polarizer transmits the intensity of a beam of the laser light through the liquid crystal, and the intensity of the beam changes according to ambient light, wherein the brightness mode signal determines a maximum value of the beam intensity. The laser dimming system of claim 5, wherein the brightness mode signal determines a structure of the liquid crystal. A laser dimming system as claimed in claim 5, wherein the microelectromechanical scanning mirror is a MEMS. A laser dimming system according to claim 5, wherein the laser light is projected onto a diffuser, projected onto an image combiner, and then imaged.