Projector having blue light alleviating part
First Claim
1. A projector, comprising:
- a light modulation part modulating light generated by a light source part;
a video signal processing part processing a video signal to be input; and
a projection optical system projecting the light modulated by said light modulation part onto an external projection target to obtain a projected video image, wherein said video signal processing part includes a blue light effect alleviating part alleviating effects of blue light on retinas, and in a case where only a ratio of a blue signal included in the video signal is high, said blue light effect alleviating part performs control to reduce the brightness of said projected video image as a whole by reducing signal values of said blue signal, a green signal, and a red signal, wherein said blue light effect alleviating part includes;
first, second, and third sum calculators calculating a sum of said red signals, a sum of said green signals, and a sum of said blue signals in individual pixels of video signals for one frame, respectively;
a first adder adding output values of said first sum calculator and said second sum calculator;
a second adder adding an output value of said first adder and an output value of said third sum calculator;
a divider dividing the output value of said first adder by an output value of said second adder;
a coefficient calculator outputting a first coefficient in a case where an output value of said divider is smaller than a specified value and outputting a second coefficient larger than said first coefficient in a case where the output value of said divider is equal to or larger than said specified value;
first, second, and third delay units outputting said red signal, said green signal, and said blue signal as a red delay signal, a green delay signal, and a blue delay signal, respectively, with delays for predetermined periods; and
first, second, and third multipliers respectively multiplying said red delay signal, said green delay signal, and said blue delay signal by said first or second coefficient.
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Accused Products
Abstract
A projector includes a light modulation part modulating light generated by a light source part, a video signal processing part processing a video signal to be input, and a projection optical system projecting the light modulated by the light modulation part onto an external projection target to obtain a projected video image. The video signal processing part includes a blue light effect alleviating part alleviating effects of blue light on retinas. In a case where only a ratio of a blue signal included in the video signal is high, the blue light effect alleviating part performs control to reduce the brightness of the projected video image as a whole by reducing signal values of the blue signal, a green signal, and a red signal.
12 Citations
26 Claims
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1. A projector, comprising:
- a light modulation part modulating light generated by a light source part;
a video signal processing part processing a video signal to be input; and
a projection optical system projecting the light modulated by said light modulation part onto an external projection target to obtain a projected video image, wherein said video signal processing part includes a blue light effect alleviating part alleviating effects of blue light on retinas, and in a case where only a ratio of a blue signal included in the video signal is high, said blue light effect alleviating part performs control to reduce the brightness of said projected video image as a whole by reducing signal values of said blue signal, a green signal, and a red signal, wherein said blue light effect alleviating part includes;first, second, and third sum calculators calculating a sum of said red signals, a sum of said green signals, and a sum of said blue signals in individual pixels of video signals for one frame, respectively; a first adder adding output values of said first sum calculator and said second sum calculator; a second adder adding an output value of said first adder and an output value of said third sum calculator; a divider dividing the output value of said first adder by an output value of said second adder; a coefficient calculator outputting a first coefficient in a case where an output value of said divider is smaller than a specified value and outputting a second coefficient larger than said first coefficient in a case where the output value of said divider is equal to or larger than said specified value; first, second, and third delay units outputting said red signal, said green signal, and said blue signal as a red delay signal, a green delay signal, and a blue delay signal, respectively, with delays for predetermined periods; and first, second, and third multipliers respectively multiplying said red delay signal, said green delay signal, and said blue delay signal by said first or second coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a light modulation part modulating light generated by a light source part;
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9. A projector, comprising:
- a light modulation part modulating light generated by a light source part;
a video signal processing part processing a video signal to be input; and
a projection optical system projecting the light modulated by said light modulation part onto an external projection target to obtain a projected video image, wherein said video signal processing part includes a blue light effect alleviating part alleviating effects of blue light on retinas, and in a case where only a ratio of a blue signal included in the video signal is high, said blue light effect alleviating part performs control to reduce the brightness of said projected video image as a whole by reducing signal values of said blue signal, a green signal, and a red signal, wherein said blue light effect alleviating part includes;first, second, and third sum calculators calculating a sum of said red signals, said green signals, and said blue signals in individual pixels of video signals for one frame; fourth, fifth, and sixth multipliers multiplying output values of said first, second, and third sum calculators by values obtained by subtracting, as coefficients, a relative luminous efficiency at a wavelength of red light, a relative luminous efficiency at a wavelength of green light, and a relative luminous efficiency at a wavelength of blue light corresponding to three primary colors of light, respectively, from one; a first adder adding output values of said fourth multiplier and said fifth multiplier; a second adder adding an output value of said first adder and an output value of said sixth multiplier; a divider dividing the output value of said first adder by an output value of said second adder; a coefficient calculator outputting a first coefficient in a case where an output value of said divider is smaller than a specified value and outputting a second coefficient larger than said first coefficient in a case where the output value of said divider is equal to or larger than said specified value; first, second, and third delay units outputting said red signal, said green signal, and said blue signal as a red delay signal, a green delay signal, and a blue delay signal, respectively, with delays of predetermined periods; and first, second, and third multipliers respectively multiplying said red delay signal, said green delay signal, and said blue delay signal by said first or second coefficient. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
- a light modulation part modulating light generated by a light source part;
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18. A projector, comprising:
- a light modulation part modulating light generated by a light source part;
a video signal processing part processing a video signal to be input; and
a projection optical system projecting the light modulated by said light modulation part onto an external projection target to obtain a projected video image, wherein said video signal processing part includes a blue light effect alleviating part alleviating effects of blue light on retinas, and in a case where only a ratio of a blue signal included in the video signal is high, said blue light effect alleviating part performs control to reduce the brightness of said projected video image as a whole by reducing signal values of said blue signal, a green signal, and a red signal, wherein said blue light effect alleviating part includes;first, second, and third sum calculators calculating a sum of said red signal, said green signal, and said blue signal in individual pixels of the video signal for one frame; fourth, fifth, and sixth multipliers multiplying output values of said first, second, and third sum calculators by, as coefficients, a reciprocal of a relative luminous efficiency at a wavelength of red light, a reciprocal of a relative luminous efficiency at a wavelength of green light, and a reciprocal of a relative luminous efficiency at a wavelength of blue light corresponding to three primary colors of light, respectively; a first adder adding output values of said fourth multiplier and said fifth multiplier; a second adder adding an output value of said first adder and an output value of said sixth multiplier; a divider dividing the output value of said first adder by an output value of said second adder; a coefficient calculator outputting a first coefficient in a case where an output value of said divider is smaller than a specified value and outputting a second coefficient larger than said first coefficient in a case where the output value of said divider is equal to or larger than said specified value; first, second, and third delay units outputting said red signal, said green signal, and said blue signal as a red delay signal, a green delay signal, and a blue delay signal, respectively, with delays of predetermined periods; and first, second, and third multipliers respectively multiplying said red delay signal, said green delay signal, and said blue delay signal by said first or second coefficient. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
- a light modulation part modulating light generated by a light source part;
Specification