RGBW display apparatus and control method thereof
First Claim
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1. A four-primary-color display apparatus comprising:
- a four-color mapping unit for receiving a plurality of three-color image input signals and generating a plurality of corresponding mapping scale ratios and thereby generating a plurality of corresponding four-color image output signals respectively mapping from the three-color image input signals, wherein each of the four-color image output signals comprises a first color signal, a second color signal, a third color signal and a white color signal;
a dynamic backlight control unit electrically connected to the four-color mapping unit for receiving the mapping scale ratios, and thereby outputting a backlight adjust signal and a white color signal adjust ratio, wherein the white color signal adjust ratio is for updating the white color signal and is dynamically calculated according to the mapping scale ratios, and the four-color mapping unit operatively adjusts the white color signal to be an updated white color signal according to the white color signal adjust ratio but does not update the generated first through third color signals, wherein the updated white color signal is obtained by multiplying the white color signal by the white color signal adjust ratio;
a backlight module electrically connected to the dynamic backlight control unit and for receiving the backlight adjust signal and thereby generating a backlight output intensity;
a source driver electrically connected to the four-color mapping unit and for receiving the not-updated first through third color signals and the updated white color signal, and thereby generating a plurality of data signals according to the received not-updated first through third color signals and updated white color signal; and
a pixel array electrically connected to the source driver and for displaying an image according to the data signals and the backlight output intensity,wherein;
if one of the three-color image input signals is close to pure color, the corresponding mapping scale ratio is near to 1;
if one of the three-color image input signals is impure color, the corresponding mapping scale ratio is near to 2.
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Abstract
In an exemplary RGBW display apparatus, a plurality of four-color image output signals and a plurality of mapping scale ratios are generated according to a plurality of three-color image input signals. Furthermore, a backlight output intensity outputted from a backlight module is dynamically adjusted according to the mapping scale ratios and a white color signal adjust ratio is generated. In addition, a white color signal in each of the four-color image output signals is adjusted to be an updated white color signal according to the white color signal adjust ratio.
17 Citations
14 Claims
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1. A four-primary-color display apparatus comprising:
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a four-color mapping unit for receiving a plurality of three-color image input signals and generating a plurality of corresponding mapping scale ratios and thereby generating a plurality of corresponding four-color image output signals respectively mapping from the three-color image input signals, wherein each of the four-color image output signals comprises a first color signal, a second color signal, a third color signal and a white color signal; a dynamic backlight control unit electrically connected to the four-color mapping unit for receiving the mapping scale ratios, and thereby outputting a backlight adjust signal and a white color signal adjust ratio, wherein the white color signal adjust ratio is for updating the white color signal and is dynamically calculated according to the mapping scale ratios, and the four-color mapping unit operatively adjusts the white color signal to be an updated white color signal according to the white color signal adjust ratio but does not update the generated first through third color signals, wherein the updated white color signal is obtained by multiplying the white color signal by the white color signal adjust ratio; a backlight module electrically connected to the dynamic backlight control unit and for receiving the backlight adjust signal and thereby generating a backlight output intensity; a source driver electrically connected to the four-color mapping unit and for receiving the not-updated first through third color signals and the updated white color signal, and thereby generating a plurality of data signals according to the received not-updated first through third color signals and updated white color signal; and a pixel array electrically connected to the source driver and for displaying an image according to the data signals and the backlight output intensity, wherein;
if one of the three-color image input signals is close to pure color, the corresponding mapping scale ratio is near to 1;
if one of the three-color image input signals is impure color, the corresponding mapping scale ratio is near to 2. - View Dependent Claims (2, 3, 4, 5, 14)
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6. A four-primary-color display apparatus comprising:
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a four-color mapping unit for receiving a plurality of three-color image input signals and mapping the three-color image input signals to a plurality of four-color image output signals respectively, wherein each of the four-color image output signals comprises a first color signal, a second color signal, a third color signal and a white color signal; a saturation mapping unit for receiving the three-color image input signals and mapping the received three-color image input signals to be a plurality of saturation values; a dynamic backlight control unit electrically connected to the saturation mapping unit and for receiving the saturation values and thereby outputting a backlight adjust signal and a white color signal adjust ratio, wherein the white color signal adjust ratio is for updating the white color signal and is dynamically calculated according to the saturation values, and the four-color mapping unit operatively adjusts the white color signal to be an updated white color signal according to the white color signal adjust ratio but does not update the first through third color signals, wherein the updated white color signal is obtained by multiplying the white color signal by the white color signal adjust ratio; a backlight module electrically connected to the dynamic backlight control unit and for receiving the backlight adjust signal and thereby generating a backlight output intensity; a source driver electrically connected to the four-color mapping unit and for receiving the not-updated first through third color signals together with the updated white color signal outputted from the four-color mapping unit and thereby generating a plurality of data signals; and a pixel array electrically connected to the source driver and for displaying an image according to the data signals and the backlight output intensity. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A control method of a four-primary-color display apparatus comprising steps of:
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receiving a plurality of three-color image input signals; mapping the three-color image input signals respectively to be a plurality of four-color image output signals according to a pre-mapping lookup table, wherein each of the four-color image output signals comprises a first color signal, a second color signal, a third color signal and a white color signal; mapping the three-color image input signals to be a plurality of saturation values; computing the saturation values and thereby outputting a backlight adjust signal and a white color signal adjust ratio, wherein the white color signal adjust ratio is dynamically calculated according to the saturation values and is for updating the white color signal; controlling a backlight module to generate a backlight output intensity according to the backlight adjust signal; adjusting the white color signal to be an updated white color signal according to the white color signal adjust ratio while not updating the first through third color signals, wherein the updated white color signal is obtained by multiplying the white color signal by the white color signal adjust ratio; and displaying an image on a pixel array according to the backlight output intensity and the not-updated first through third color signals together with the updated white color signal. - View Dependent Claims (13)
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Specification