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, whereinsaid video signal processing part includes a blue light effect alleviating part alleviating effects of blue light on retinas, andin a case where among a red signal, a green signal, and a blue signal included in the video signal, only a ratio of said blue signal is high, said blue light effect alleviating part generates a blue light effect alleviating signal for controlling said light source part to reduce the brightness of said projected video image as a whole, whereinsaid 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; and
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, as a blue light effect alleviating signal,said light source part includes;
a red light source, a green light source, and a blue light source; and
a first light source control driver outputting a first drive current for driving said red light source, a second light source control driver outputting a second drive current for driving said green light source, and a third light source control driver outputting a third drive current for driving said blue light source,said blue light effect alleviating signal is provided to said first to third light source control drivers, andsaid first to third light source control drivers output said first to third drive currents, respectively, at a duty ratio corresponding to said first or second coefficient based on said blue light effect alleviating signal.
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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 among a red signal, a green signal, and a blue signal included in a video signal, only a ratio of the blue signal is high, the blue light effect alleviating part generates a blue light effect alleviating signal for controlling the light source part to reduce the brightness of the projected video image as a whole.
20 Citations
26 Claims
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1. A projector, comprising:
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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 among a red signal, a green signal, and a blue signal included in the video signal, only a ratio of said blue signal is high, said blue light effect alleviating part generates a blue light effect alleviating signal for controlling said light source part to reduce the brightness of said projected video image as a whole, 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; and 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, as a blue light effect alleviating signal, said light source part includes; a red light source, a green light source, and a blue light source; and a first light source control driver outputting a first drive current for driving said red light source, a second light source control driver outputting a second drive current for driving said green light source, and a third light source control driver outputting a third drive current for driving said blue light source, said blue light effect alleviating signal is provided to said first to third light source control drivers, and said first to third light source control drivers output said first to third drive currents, respectively, at a duty ratio corresponding to said first or second coefficient based on said blue light effect alleviating signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A projector, comprising:
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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 among a red signal, a green signal, and a blue signal included in the video signal, only a ratio of said blue signal is high, said blue light effect alleviating part generates a blue light effect alleviating signal for controlling said light source part to reduce the brightness of said projected video image as a whole, 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; first, second, and third 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 from one, respectively; a first adder adding output values of said first multiplier and said second multiplier; a second adder adding an output value of said first adder and an output value of said third multiplier; a divider dividing the output value of said first adder by an output value of said second adder; and 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, said light source part includes; a red light source, a green light source, and a blue light source; and a first light source control driver outputting a first drive current for driving said red light source, a second light source control driver outputting a second drive current for driving said green light source, and a third light source control driver outputting a third drive current for driving said blue light source, said blue light effect alleviating signal is provided to said first to third light source control drivers, and said first to third light source control drivers output said first to third drive currents, respectively, at a duty ratio corresponding to said first or second coefficient based on said blue light effect alleviating signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A projector, comprising:
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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 among a red signal, a green signal, and a blue signal included in the video signal, only a ratio of said blue signal is high, said blue light effect alleviating part generates a blue light effect alleviating signal for controlling said light source part to reduce the brightness of said projected video image as a whole, 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; first, second, and third 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 first multiplier and said second multiplier; a second adder adding an output value of said first adder and an output value of said third multiplier; a divider dividing the output value of said first adder by an output value of said second adder; and 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, said light source part includes; a red light source, a green light source, and a blue light source; and a first light source control driver outputting a first drive current for driving said red light source, a second light source control driver outputting a second drive current for driving said green light source, and a third light source control driver outputting a third drive current for driving said blue light source, said blue light effect alleviating signal is provided to said first to third light source control drivers, and said first to third light source control drivers output said first to third drive currents, respectively, at a duty ratio corresponding to said first or second coefficient based on said blue light effect alleviating signal. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification