Projector and method for projecting an image

A method for projecting an image, comprising

• directing light onto an illumination modulator with multiple illumination pixels which are arranged in columns and rows and can be controlled independently of one another in order to modulate the intensity of the light pixel-by-pixel;
• imaging the light modulated pixel-by-pixel onto an image modulator with multiple image pixels which are arranged in columns and rows and which can be controlled independently of one another to generate an image to be projected such that either precisely one image pixel of the image modulator is allocated to each illumination pixel or each illumination pixel of the illumination modulator is allocated to several image pixels;
• generating pulse width modulation illumination control data for the illumination modulator from image data of the image to be generated;
• inputting the pulse width modulation illumination control data into the illumination modulator to modulate the light;
• generating pulse width modulation image control data for the image modulator;
• inputting the pulse width modulation image control data into the image modulator to generate an image;
• wherein the pulse width modulation illumination control data for every illumination pixel has either an on-value to illuminate, with the light coming from this illumination pixel, the allocated image pixel or the allocated image pixels of the image modulator to generate an image, or an off-value to minimize the intensity of the light coming from this illumination pixel and imaged onto the allocated image pixel or allocated image pixels, and wherein the pulse width modulation illumination control data are generated such that the illumination control data has the on-value for every illumination pixel which is allocated to one or at least one image pixel which is, according to the pulse width modulation image data, to represent a brightness value lying above a predetermined threshold value in the image and has the off-value for all other illumination pixels surrounding the illumination pixels for which the control data has an on value, except that the pulse width modulation illumination control data for at least one of the other illumination pixels, whose allocated image pixel or at least one of whose allocated image pixels is not more than a predetermined number of pixels away from an above threshold image pixel which is, according to the image data, to represent a brightness value lying above the predetermined threshold value has the on-value while other illumination pixels that are more than predetermined number of pixels away from the image pixel, which according to the image data is to represent a brightness value lying above the predetermined threshold value, have the off value and wherein when the predetermined number of pixels away from the above threshold image pixel is zero, the pixels immediately adjacent to the image pixel have the on value;
• wherein the above threshold image pixels which are to represent a predefined brightness in the image and that are adjacent to image pixels which are to represent black are illuminated with at least equal intensity to bright adjacent image pixels that are surrounded only by bright image pixels that are to represent bright image elements whereby undesired brightness fluctuations of the image are avoided.

A projector for projecting an image, comprising:

• an illumination modulator struck by light which has multiple illumination pixels arranged in columns and rows which can be controlled independently of one another in order to modulate the intensity of the light pixel-by-pixel;
• imaging optics, arranged downstream of the illumination modulator, which image the light modulated pixel-by-pixel onto an image modulator with multiple image pixels arranged in columns and rows which can be controlled independently of one another to generate the image to be projected such that each illumination pixel is allocated to several image pixels;
• a control unit, to which image data of the image to be generated is fed, and which generates from the image data pulse width modulation illumination control data for the illumination modulator and inputs the pulse width modulation illumination control data into the illumination modulator to modulate the light, and also generates pulse width modulation image control data for the image modulator and inputs the pulse width modulation image control data into the image modulator to generate an image,
• wherein the pulse width modulation illumination control data for every illumination pixel has either an on-value to illuminate the allocated image pixels of the image modulator with the light coming from these illumination pixels to generate an image, or an off-value to minimize the intensity of the light coming from this illumination pixel and imaged onto the allocated image pixels, and the pulse width modulation illumination control data are generated such that the pulse width modulation illumination control data has the on-value for every illumination pixel which is allocated to at least one above threshold image pixel which is, according to the image data, to represent a brightness value lying above a predetermined threshold value in the image, and the off-value for all other illumination pixels, in which
• the illumination pixels can each be switched into a first state in which the light coming from the illumination pixel is imaged onto the allocated image pixel, and into a second state in which no light is imaged onto the allocated above threshold image pixel, and
• the image pixels can each be switched into a first state in which the light coming from the image pixel is used to generate an image, and into a second state in which no light from the image pixel is used to generate an image,
• in which, in the pulse width modulation illumination control data, the on-value for the illumination pixels is chosen such that every illumination pixel at least one of whose allocated above threshold image pixels is, according to the image data, to represent a brightness value lying above the predetermined brightness threshold value in the image is always switched into the first state precisely only at the times when at least one of the allocated above threshold image pixels is switched into the first state and wherein when the predetermined number of pixels away from the above threshold image pixel is zero, the pixels immediately adjacent to the image pixel have the on value;
• wherein the above threshold image pixels which are to represent a predefined brightness in the image and that are adjacent to image pixels which are to represent black are illuminated with at least equal intensity to bright adjacent image pixels that are surrounded only by bright image pixels that are to represent bright image elements whereby undesired brightness fluctuations of the image are avoided.

A method for projecting an image, comprising:

• directing light onto an illumination modulator which has multiple illumination pixels arranged in columns and rows which can be controlled independently of one another to modulate the intensity of the light pixel-by-pixel;
• imaging the light modulated pixel-by-pixel onto an image modulator with several image pixels arranged in columns and rows which can be controlled independently of one another to generate the image to be projected such that each illumination pixel is allocated to several image pixels;
• generating pulse width modulation illumination control data for the illumination modulator from image data of the image to be generated;
• inputting the pulse width modulation illumination control data into the illumination modulator to modulate the light;
• generating pulse width modulation image control data for the image modulator;
• inputting the pulse width modulation image control data into the image modulator to generate an image;
• wherein the pulse width modulation illumination control data for every illumination pixel has either an on-value to illuminate the allocated image pixels of the image modulator with the light coming from these illumination pixels to generate an image, or an off-value to minimize the intensity of the light coming from this illumination pixel and imaged onto the allocated image pixels, and are generated such that the pulse width modulation illumination control data has the on-value for every illumination pixel which is allocated to at least one above threshold image pixel which is, according to the image data, to represent a brightness value lying above a predetermined threshold value in the image, and the off-value for all other illumination pixels;
• in which
• the illumination pixels can each be switched into a first state in which the light coming from the illumination pixel is imaged onto the allocated image pixel, and into a second state in which no light is imaged onto the allocated image pixel;
• and
• the image pixels can each be switched into a first state in which the light coming from the image pixel is used to generate an image, and into a second state in which no light from the image pixel is used to generate an image;
• further comprising choosing, in the pulse width modulation illumination control data, the on-value for the illumination pixels such that every illumination pixel at least one of whose allocated above threshold image pixels is, according to the image data, to represent a brightness value lying above the predetermined threshold value in the image is always switched into the first state precisely only at the times when at least one of the allocated above threshold image pixels is switched into the first state and wherein when the predetermined number of pixels away from the above threshold image pixel is zero, the pixels immediately adjacent to the image pixel have the on value;
• wherein the above threshold image pixels which are to represent a predefined brightness in the image and that are adjacent to image pixels which are to represent black are illuminated with at least equal intensity to bright adjacent image pixels that are surrounded only by bright image pixels that are to represent bright image elements whereby undesired brightness fluctuations of the image are avoided.