Patent Document

TECHNICAL FIELD 
       [0001]    The disclosure relates to an optical sense-control system, and more particularly to an optical sense-control system having a higher identification ratio to lights with different wavebands. 
       BACKGROUND 
       [0002]    A widescreen optical sense-control system, such as an optical touch-panel system, has a wide application such as an electronic whiteboard (E-Board).  FIG. 1  is a schematic diagram illustrating a user using a conventional optical sense-control system. As depicted in  FIG. 1 , the conventional optical sense-control system  10  mainly includes a touch-control panel  12 . While the user  14  inputs information on the touch-control panel  12  via a light pen  16 , the inputted information is displayed on the touch-control panel  12 . 
         [0003]    To make the user  14  can use the optical sense-control system  10  more conveniently, the light pen  16  is designed to be capable of emitting lights with different colors and the optical sense-control system  10  can perform a specific response action based on the color of the light received by the optical sense-control system  10 . For example, information of a specific color or of that a specific command has been executed may be displayed on the touch-control panel  12  while a corresponding color of light is detected on the touch-control panel  12 . 
         [0004]    Different wavelengths have different transmission ratios (or, intensities) to a same optical filter; this can be used for distinguishing the colors of light.  FIG. 2  is a schematic chart illustrating the filtering characteristics of the wavelength, transmission ratio and intensity of a blue-light filter, a green-light filter, and a red-light filter which are adopted in the conventional optical sense-control system  10 . As depicted in  FIG. 2 , the blue light B, the green light G, and the red light R are defined with different wavelengths λ and frequencies f, based on the transmission ratios T or intensity I thereof relative to the blue-light filter, the green-light filter, and the red-light filter of the optical sense-control system  10 ; where the wavelength λ and the frequency f are reciprocal to each other. As depicted in  FIG. 2 , in the conventional optical sense-control system  10 , the blue light B is defined to include the lights with wavelengths within a waveband B λ ; the green light G is defined to include the lights with wavelengths within a waveband G λ , the red light R is defined to include the lights with wavelengths within a waveband R λ . Because the blue light B, the green light G, and the red light R are defined in three different specific wavebands in the optical sense-control system  10 , a specific response action is accordingly performed while a corresponding light with a specific wavelength, which is emitted from the light pen  16 , is detected by the touch-control panel  12 . For example, please refer to both  FIG. 1  and  FIG. 2 , a control signal corresponding to the blue light B is created by the optical sense-control system  10  while a light L 1  with a wavelength located within the waveband B λ , is detected on the touch-control panel  12 . 
         [0005]    However, as depicted in  FIG. 2 , there are overlaps between the definitions of the blue light B, the green light G, and the red light R in the conventional optical sense-control system  10 . If a specific light with a wavelength which are located in the overlap waveband of any two of the wavebands B λ , G λ , R λ , the conventional optical sense-control system  10  may result in an error detection of the specific light and accordingly perform an error response action. For example, please refer to  FIG. 1  and  FIG. 2  again, if a light L 2 , having a wavelength located in both the waveband B λ  and the waveband G λ , is emitted to the touch-control panel  12  from the light pen  16 , the optical sense-control system  10  may create a control signal corresponding to both the blue light B and the green light G due to both the blue-light filter (not shown) and the green-light filter detect the light L 2 , even though the light L 2  had a much higher transmission ratio to the blue-light filter than that to the green-light filter. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    The objects and advantages of the present disclosure will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which: 
           [0007]      FIG. 1  is a schematic diagram illustrating a user using a conventional optical sense-control system; 
           [0008]      FIG. 2  is a schematic chart illustrating the filtering characteristics of the wavelength, transmission ratio and intensity of a blue-light filter, a green-light filter, and a red-light filter which are adopted in the conventional optical sense-control system; 
           [0009]      FIG. 3  schematically illustrates one of the optical sense-control units adopted in an optical sense-control system of the present embodiment; 
           [0010]      FIG. 4A  is a schematic chart illustrating the filtering characteristics of the blue-light filter, the green-light filter, and the red-light filter to the wavelength, transmission ratio and intensity of the lights, according to the first embodiment; 
           [0011]      FIG. 4B  is a schematic chart illustrating an example of lights in the wavelength/transmission ratio/intensity defined by the blue-light filter, the green-light filter, and the red-light filter which are adopted in the first embodiment; 
           [0012]      FIG. 4C  is a schematic chart illustrating an example of lights in the wavelength/transmission ratio/intensity defined by the blue-light filter, the green-light filter, and the red-light filter which are adopted in the first embodiment; 
           [0013]      FIG. 4D  is a schematic chart illustrating an example of lights in the wavelength/transmission ratio/intensity defined by the blue-light filter, the green-light filter, and the red-light filter which are adopted in the first embodiment; 
           [0014]      FIG. 5A  is a schematic chart illustrating the filtering characteristics of the blue-light filter, the green-light filter, and the red-light filter to the wavelength, transmission ratio and intensity of the lights, according to the second embodiment; 
           [0015]      FIG. 5B  is a schematic chart illustrating an example of lights in the wavelength/transmission ratio/intensity defined by the blue-light filter, the green-light filter, and the red-light filter which are adopted in the second embodiment; 
           [0016]      FIG. 5C  is a schematic chart illustrating an example of lights in the wavelength/transmission ratio/intensity defined by the blue-light filter, the green-light filter, and the red-light filter which are adopted in the second embodiment; 
           [0017]      FIG. 6A  is a schematic chart illustrating the filtering characteristics of the blue-light filter, the green-light filter, and the red-light filter to the wavelength, transmission ratio and intensity of the lights, according to the third embodiment; 
           [0018]      FIG. 6B  is a schematic chart illustrating an example of lights in the wavelength/transmission ratio/intensity defined by the blue-light filter, the green-light filter, and the red-light filter which are adopted in the third embodiment; and 
           [0019]      FIG. 6C  is a schematic chart illustrating an example of lights in the wavelength/transmission ratio/intensity defined by the blue-light filter, the green-light filter, and the red-light filter which are adopted in the third embodiment. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0020]    The present invention will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed. 
         [0021]      FIG. 3  schematically illustrates one of the optical sense-control units adopted in an optical sense-control system of the present embodiment; wherein the optical sense-control system of the present embodiment includes n*m optical sense-control units. As depicted in  FIG. 3 , the optical sense-control unit  20 , arranged in the optical sense-control system of the present embodiment, includes a blue-light filter  22 , a green-light filter  24 , a red-light filter  26 , and an optical sense device array  28 . In the optical sense-control unit  20 , the lights corresponding to a specific waveband B λ  and capable of passing through the blue-light filter  22 , is defined as blue light B; the lights corresponding to a specific waveband G λ  and capable of passing through the green-light filter  24 , is defined as green light G; and the light corresponding to a specific waveband R λ  and capable of passing through the red-light filter  26 , is defined as red light R; wherein the blue light B, the green light G, and the red light R are emitted from a light pen (not shown), B λ &lt;G λ &lt;R λ , and there is no overlap between the wavebands B λ , G λ , and R λ . In other words, the blue-light filter  22  has a filtering characteristic of having a higher transmission ratio to the blue light B rather than that to the green G light and the red R light; the green-light filter  24  has a filtering characteristic of having a higher transmission ratio to the green light G rather than that to the blue light B and the red light R; the red-light filter  26  has a filtering characteristic of having a higher transmission ratio to the red light R rather than that to the blue light B and the green light G; wherein the intensity of the blue light B is concentrated in the range of waveband B λ , the intensity of the green light G is concentrated in the range of waveband G λ , and the intensity of the red light R is concentrated in the range of waveband R λ , as mentioned above. 
         [0022]    Moreover, as depicted in  FIG. 3 , the optical sense device array  28  includes a blue-light sensor  32 , a green-light sensor  34 , and a red-light sensor  36 , respectively used for detecting the intensity of the lights  30  capable of passing through the blue-light filter  22 , the green-light filter  24 , and the red-light filter  26 . Alternatively, the blue-light sensor  32 , the green-light sensor  34 , and the red-light sensor  36  can be also three corresponding optical sensing zones. Moreover, a specific control signal S(B, G, R) is created and outputted from the optical sense device array  28  according to the intensity of the lights  30  detected by the blue-light sensor  32 , the green-light sensor  34 , and the red-light sensor  36 . 
         [0023]    For example, a first control signal (i.e., S(B, G, R)=S(1, 0, 0)), corresponding to the blue light B, is created and outputted from the optical sense device array  28  if only the blue-light sensor  32  detects the intensity of the lights  30  which is capable of passing through the blue-light filter  22 ; a second control signal (i.e., S(B, G, R)=S(0, 1, 0)), corresponding to the green light G, is created and outputted from the optical sense device array  28  if only the green-light sensor  34  detects the intensity of the light  30  which is capable of passing through the green-light filter  24 ; and a third control signal (i.e., S(B, G, R)=S(0, 0, 1)), corresponding to the red light R, is created and outputted from the optical sense device array  28  if only the red-light sensor  36  detects the intensity of the light  30  which is capable of passing through the red-light filter  26 . 
         [0024]    Instead of being composed by a single color light which is emitted from a single light source, it is to be understood that the lights  30  can be composed by multiple color lights which are emitted from multiple light sources. Therefore, a fourth control signal (i.e., S(B, G, R)=S(1, 1, 0)), corresponding to the blue light B and the green light G, is created and outputted from the optical sense device array  28  if both the blue-light sensor  32  and the green-light sensor  34  detect the intensity of the lights  30  capable of passing through the blue-light filter  22  and the green-light filter  24 ; a fifth control signal (i.e., S(B, G, R)=S(0, 1, 1)), corresponding to the green light G and the red light R, is created and outputted from the optical sense device array  28  if both the green-light sensor  34  and the red-light sensor  36  detect the intensity of the lights  30  capable of passing through the green-light filter  24  and the red-light filter  26 ; a sixth control signal (i.e., S(B, G, R)=S(1, 0, 1)), corresponding to the blue light B and the red light R, is created and outputted from the optical sense device array  28  if both the blue-light sensor  32  and the red-light sensor  36  detect the intensity of the lights  30  capable of passing through the blue-light filter  22  and the red-light filter  26 ; and a seventh control signal (i.e., S(B, G, R)=S(1, 1, 1)), corresponding to the blue light B, the green light G, and the red light R, is created and outputted from the optical sense device array  28  if all the blue-light sensor  32 , the green-light sensor  34 , and the red-light sensor  36  detect the intensity of the lights  30  capable of passing through the blue-light filter  22 , the green-light filter  24 , and the red-light filter  26 . Moreover, it is to be understood that the lights  30  can be emitted from a single light pen which is capable of emitting a single color light or emitting multiple color lights; or, the lights  30  composed by multiple color lights can be emitted from multiple light pens each emitting a single color light. 
         [0025]      FIG. 4A  is a schematic chart illustrating the filtering characteristics of the blue-light filter  22 , the green-light filter  24 , and the red-light filter  26  to the wavelength, transmission ratio and intensity of the lights, according to the first embodiment of the present invention. As depicted in  FIG. 4A , the waveband B λ  of the blue light B is defined in the first embodiment as a range of wavelengths B L ˜B H  which correspond to the highest intensity of the lights capable of passing through the blue-light filter  22 ; the waveband G λ  of the green light G is defined as a range of G L ˜G H  which correspond to the highest intensity of the lights capable of passing through the green-light filter  24 ; the waveband R λ  of the red light R is defined as a range of R L ˜R H  which correspond to the highest intensity of the lights capable of passing through the red-light filter  26 . In the first embodiment, a specific control signal S(B, G, R) is outputted from the optical sense device array  28  while wavelengths within a corresponding waveband is detected. For example, please refer to both the  FIG. 3  and  FIG. 4B , if the lights  30  are composed by a single light L 1  whose waveband is within the range of B L ˜B H , the lights  30  can only pass through the blue-light filter  22  so that only the blue-light sensor  32  can detect the intensity of the lights  30 , thereby a first control signal (i.e., S(B, G, R)=S(1, 0, 0)) corresponding to the blue light B is created and outputted from the optical sense device array  28 . Please refer to both the  FIG. 3  and  FIG. 4C , if the lights  30  are composed by two lights L 1  and L 2 , wherein the waveband of the light L 1  is within the range of B L ˜B H  and the waveband of the light L 2  is within the range of G L ˜G H , the lights  30  can pass through both the blue-light filter  22  and the green-light filter  24  so that the blue-light sensor  32  can detect the intensity of light L 1  and the green-light sensor  34  can detect the intensity of light L 2 , thereby a fourth control signal (i.e., S(B, G, R)=S(1, 1, 0)) corresponding to the blue light B and the green light G is created and outputted from the optical sense device array  28 . 
         [0026]      FIG. 5A  is a schematic chart illustrating the filtering characteristics of the blue-light filter  22 , the green-light filter  24 , and the red-light filter  26  to the wavelength, transmission ratio and intensity of the lights, according to the second embodiment of the present invention. As depicted in  FIG. 5A , the waveband G λ  of the green light G is defined in the second embodiment between wavelengths X 1 ˜X 2 , wherein the wavelength X 1  corresponds to the 50% of the maximum intensity of the lights capable of passing through the blue-light filter  22 , and the wavelength X 2  corresponds to the 50% of the maximum intensity of the lights capable of passing through the red-light filter  26 . Therefore, as depicted in  FIG. 5A , the wavelength X 1  corresponds to 50% of the maximum transmission ratio (or full-width-at-half-maximum) of the blue-light filter  22 , that is, the wavelength X 1  corresponds to the transmission ratio of 35% due to the maximum transmission ratio of the blue-light filter  22  is about 70%; and the wavelength X 2  corresponds to 50% of the maximum transmission ratio of the blue-light filter  22 , that is, the wavelength X 2  corresponds to the transmission ratio of 45% due to the maximum transmission ratio of the red-light filter  26  is about 90%. Accordingly, the blue light B defined in the second embodiment has a waveband B λ  with wavelengths thereof less than X 1 , and the red light R defined in the second embodiment has a waveband R λ  with wavelengths thereof greater than X 2 . In the second embodiment, a specific control signal S(B, G, R) is outputted from the optical sense device array  28  while wavelengths within a corresponding waveband is detected. For example, please refer to both the  FIG. 3  and  FIG. 5B , if the lights  30  are composed by a single light L 1  whose wavelength is less than X 1 , the lights  30  can only pass through the blue-light filter  22  so that only the blue-light sensor  32  can detect the intensity of the lights  30 , thereby a first control signal (i.e., S(B, G, R)=S(1, 0, 0)) corresponding to the blue light B is created and outputted from the optical sense device array  28 . Please refer to both the  FIG. 3  and  FIG. 5C , if the lights  30  are composed by two lights L 1  and L 2 , wherein the wavelength of the light L 1  is less than X 1  and the wavelength of the light L 2  is within the range of X 1 ˜X 2 , the lights  30  can pass through both the blue-light filter  22  and the green-light filter  24  so that the blue-light sensor  32  can detect the intensity of light L 1  and the green-light sensor  34  can detect the intensity of light L 2 , thereby a fourth control signal (i.e., S(B, G, R)=S(1, 1, 0)) corresponding to the blue light B and the green light G is created and outputted from the optical sense device array  28 . 
         [0027]    It is to be understood that the second embodiment needs not be limited to set the wavelength X 1  to correspond to 50% of the maximum transmission ratio of the lights capable of passing through the blue-light filter  22 , and not be limited to set the wavelength X 2  to correspond to 50% of the maximum transmission ratio of the lights capable of passing through the red-light filter  26 . The wavelength X 1  can be set to correspond to other ratio of the maximum transmission ratio of the blue-light filter  22 , such as 30%, and the wavelength X 2  can also be set to correspond to other ratio of the maximum transmission ratio of the red-light filter  26 , such as 30%. However, the ratio 50% has a better practice than the ratio 30% has. 
         [0028]      FIG. 6A  is a schematic chart illustrating the filtering characteristics of the blue-light filter  22 , the green-light filter  24 , and the red-light filter  26  to the wavelength, transmission ratio and intensity of the lights, according to the third embodiment of the present invention. As depicted in  FIG. 6A , the waveband G λ  of the green light G defined in the third embodiment is between wavelengths X 1 ˜X 2 ; wherein the wavelength X 1  corresponds to a junction where the blue-light filter  22  and the green-light filter  24  have a same transmission ratio to a same light, and the wavelength X 2  corresponds to a junction where the green-light filter  24  and the red-light filter  26  have a same transmission ratio to a same light. Accordingly, the blue light B defined in the third embodiment has a waveband B λ  with wavelengths thereof less than X 1 , and the red light R defined in the third embodiment has a waveband R λ  with wavelengths thereof greater than X 2 . In the third embodiment, a specific control signal S(B, G, R) is outputted from the optical sense device array  28  while wavelengths within a corresponding waveband is detected. For example, please refer to both the  FIG. 3  and  FIG. 6B , if the lights  30  are composed by a single light L 1  whose wavelength is less than X 1 , the lights  30  can only pass through the blue-light filter  22  so that only the blue-light sensor  32  can detect the intensity of the lights  30 , thereby a first control signal (i.e., S(B, G, R)=S(1, 0, 0)) corresponding to the blue light B is created and outputted from the optical sense device array  28 . Please refer to both the  FIG. 3  and  FIG. 6C , if the lights  30  are composed by two lights L 1  and L 2 , wherein the wavelength of the light L 1  is less than X 1  and the wavelength of the light L 2  is within the range of X 1 ˜X 2 , the lights  30  can pass through both the blue-light filter  22  and the green-light filter  24  so that the blue-light sensor  32  can detect the intensity of light L 1  and the green-light sensor  34  can detect the intensity of light L 2 , thereby a fourth control signal (i.e., S(B, G, R)=S(1, 1, 0)) corresponding to the blue light B and the green light G is created and outputted from the optical sense device array  28 . 
         [0029]    Based on the characteristics of the present invention, a first control signal is created by the optical sense device array  28  if a first light is detected in a first optical sensing zone of the optical sense device array  28 ; a second control signal is created by the optical sense device array  28  if a second light is detected in a second optical sensing zone of the optical sense device array  28 ; accordingly, a n th  control signal is created by the optical sense device array  28  if a n th  light is detected in a n th  optical sensing zone of the optical sense device array  28 . 
         [0030]    Summarily, the identification rate to distinguish the blue, green, and red lights with different wavebands is accordingly increasing, by the blue-light filter  22 , the green-light filter  24 , and the red-light filter  26  in the optical sense-control system of the present invention. 
         [0031]    Moreover, the definition approach to distinguish the blue light (waveband B λ ), the green light (waveband G λ ), and the red light (waveband R λ ) using the blue-light filter  22 , the green-light filter  24 , and the red-light filter  26  in the embodiments can be mutually combined. For example, the green light G can be defined as the lights having a waveband G λ  with a range of X 1 ˜X 2 , wherein the wavelength X 1  corresponds to a junction where the blue-light filter  22  and the green-light filter  24  have a same transmission ratio of a same light, and the wavelength X 2  corresponds to 50% of the maximum intensity of the lights capable of passing through the red-light filter  26 . Accordingly, the blue light G is defined as the lights having wavelengths less than X 1  and the red light R is defined as the lights having wavelength greater than X 2 . 
         [0032]    Moreover, the embodiments of the present invention can be also applied to color-mixed lights which have wavelengths crossing more than one wavebands. For example, please refer to both the  FIG. 3  and  FIG. 4D , if the lights  30  are composed by color-mixed lights L 3  whose wavelengths are crossing B H ˜G L , the lights  30  can pass through both the blue-light filter  22  and the green-light filter  24  so that both the blue-light sensor  32  and the green-light sensor  34  detect the intensity of the lights  30 , thereby a fourth control signal (i.e., S(B, G, R)=S(1, 1, 0)) corresponding to the blue light B and the green light G is created and outputted from the optical sense device array  28 . 
         [0033]    Moreover, it is to be understood that the embodiments need not be limited to adopt the three blue-light sensor  32 , the green-light sensor  34 , and the red-light sensor  36  for detecting the intensity of lights capable of passing through the blue-light filter  22 , the green-light filter  24 , and the red-light filter  26 , respectively. The embodiments can also adopt a single optical sensing device for detecting the intensity of the blue light, the green light, and the red light. 
         [0034]    Moreover, it is to be understood that the embodiments need not be limited to adopt the blue-light filter  22 , the green-light filter  24 , and the red-light filter  26  for detecting the intensity of the blue light, the green light, and the red light, respectively. The concept of the embodiments can also be applied to other primary-color filters, such as the RGBC, RGBCY, RGBW filters. 
         [0035]    Moreover, it is to be understood that the concept of the embodiments can also be applied to Color Filter on Array (COA) technology, or the RGBC, the RGBCY, and the RGBW touch-control panels. Moreover, the n-color touch panel in the embodiments can have n optical sensing zones, or multiple colors can be detected in a single optical sensing zone. 
         [0036]    While the embodiment has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.

Technology Category: g