Abstract:
A method of adjusting projector output according to environment, by an electronic device with micro-projector, is provided. The method includes capturing environmental information by a camera; adjusting the brightness of projector light source according to environmental information; and adjusting colors of contents for projection onto a particular screen. The electronic device is also provided.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to electronic devices with micro-projector which is adjustable according to environment and projecting method thereof. 
         [0003]    2. Description of Related Art 
         [0004]    Miniaturized projectors are widely used. However, the readability of any projected image may be greatly affected by ambient light conditions and the type of the screen on which the projection should be visible. For example, white color does not appear white if white balance is not properly adjusted to match the light source type, and the effect of the projection is decreased if the background color of the projected images does not match with the color of the screen. 
         [0005]    Therefore, it is desirable to provide an electronic device and a method for adjusting the projected output according to environment, which can overcome the above-mentioned shortcomings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]      FIG. 1  is a functional block diagram of an electronic device with micro-projector of which the projected output is capable of being adjusted according to environment, according to a first embodiment. 
           [0007]      FIG. 2  is a flowchart showing a method for adjusting projected output according to environment, by the electronic device of  FIG. 1 . 
           [0008]      FIG. 3  is a functional block diagram of an electronic device with micro-projector of which the projected output is capable of being adjusted according to environment, according to a second embodiment. 
           [0009]      FIG. 4  is a flowchart showing a method for adjusting projected output according to environment, by the electronic device of  FIG. 3 . 
       
    
    
     DETAILED DESCRIPTION 
       [0010]    Embodiments of the disclosure will be described with reference to the accompanying drawings. 
         [0011]    Referring to  FIG. 1 , a portable electronic device  10 , according to a first embodiment, includes a projector  110 , a camera  120 , a processor  130 , a driver  140 , and a projector light source  150 . The projector  110  is configured to project images onto a screen  20 . 
         [0012]    The camera  120  is configured to capture images of area around the projector  110 , recognize light source types, and calculate brightness of ambient light or lights. For example, the camera  120  can analyze the color temperature of the ambient lights and thus determine the light source type of the ambient lights using the following exemplary table. 
         [0000]    
       
         
               
               
               
             
           
               
                   
                   
               
               
                   
                 Light Source type 
                 Color Temperature in Kelvins 
               
               
                   
                   
               
             
             
               
                   
                 Clear Blue Sky 
                 10,000 to 15,000 
               
               
                   
                 Overcast Sky 
                 6,000 to 8,000 
               
               
                   
                 Noon Sun and Clear Sky 
                 6,500 
               
               
                   
                 Sunlight Average 
                 5,400 to 6,000 
               
               
                   
                 Electronic Flash 
                 5,400 to 6,000 
               
               
                   
                 Household Lighting 
                 2,500 to 3,000 
               
               
                   
                 200-watt Bulb 
                 2,980 
               
               
                   
                 100-watt Bulb 
                 2,900 
               
               
                   
                  75-watt Bulb 
                 2,820 
               
               
                   
                  60-watt Bulb 
                 2,800 
               
               
                   
                  40-watt Bulb 
                 2,650 
               
               
                   
                   
               
             
          
         
       
     
         [0013]    The camera  120  calculates the brightness of the ambient lights from the captured images or directly measures the brightness of the ambient lights using a photo detector. 
         [0014]    The processor  130  performs any white balance process which is required on the contents to be projected by the projector  110 . The white balance processes are performed on basis of the light source type of the ambient lights. 
         [0015]    The driver  140  adjusts the brightness of the projector light source  150 , according to the brightness of the ambient lights. For example, in a dark room, the brightness of the projector light source  150  should be lower, and the driver  140  can adjust the projector light source  150  to output less light. Outside, in sunlight, a higher brightness of the projector light source  150  is required, and the driver  140  can adjust the projector light source  150  to output more light. 
         [0016]    Referring to  FIG. 2 , an exemplary method for projecting images implemented by the portable electronic device  10  includes the following steps S 201 -S 204 . 
         [0017]    In step S 201 , the camera  120  recognizes the light source type and brightness of ambient light or lights during the projection. 
         [0018]    In step S 202 , the processor  130  performs a white balance process on the projected images according to the light source type of the existing ambient lights. 
         [0019]    In step S 203 , the driver  140  adjusts the brightness of the projector light source  150  according to the brightness of the ambient lights. 
         [0020]    In step  204 , the projector  110  projects the images based on the brightness of the projector light source  150 . 
         [0021]    Referring to  FIG. 3 , a portable electronic device  20 , according to another embodiment, is essentially similar to the portable electronic device  10 , but it further includes a color processing module  1301  in the processor  130 . The camera  120  recognizes the color of the screen  20  on which the projection is visible. For example, the camera  120  can capture images of the screen  20  and analyze the color of the screen  20 . The color processing module  1301  adjusts the background color of each of the projected images, to match the color of the screen  20 , and adjusts the foreground color of each of the projected images to a color, which is in high contrast to the color of the display screen  20 , thus increasing the readability of the presentation. 
         [0022]    Referring to  FIG. 4 , a method for projecting content according to another embodiment, is carried out by the portable electronic device  20  and includes the following exemplary steps S 404 -S 403 . 
         [0023]    In step S 401 , the camera  120  analyzes and establishes the color of the screen  20 . 
         [0024]    In step S 402 , the color processing module  1301  adjusts the background color of each of the projected images to match the color of the screen  20 , and it adjusts the foreground color of each of the projected images to a color or colors which is in high contrast to the color of the screen  20 . 
         [0025]    In step S 103 , after adjusting the brightness of the projector light source  150  and the images for projection as required, the projector  110  projects the images. 
         [0026]    Through the method above, the electronic device  10  adjusts the projection output, in respect of brightness, and the foreground and background colors respectively, according to the brightness of the ambient light of the environment and the color of the display screen  20 . 
         [0027]    Particular embodiments are shown here and described by way of illustration only. The principles and the features of the present disclosure may be employed in various and numerous embodiments thereof without departing from the scope of the disclosure as claimed. The above-described embodiments illustrate the scope of the disclosure but do not restrict the scope of the disclosure.