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US 7,583,325 B2Granted
Projection systems and processes for generating images with increased brightness uniformity
AssigneeInFocus Corporation
InventorMark D. Peterson
Life of this patent
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Abstract
Apparatuses and processes for generating images having increased brightness uniformity are disclosed herein.
Claims17
In a projection system, a method of operation, comprising:
- receiving a first image signal of an image to be projected on a screen, the first image signal including a first grayscale value for a valvelet of a light valve, wherein the valvelet is configured to generate an image segment to be projected on a screen location of the screen and the first grayscale value associated with a first brightness value;
- determining an adjustment factor for the valvelet based on a brightness value of another screen location, wherein the brightness value of the other screen location is different than the first brightness value;
- adjusting the first grayscale value with the adjustment factor to produce an adjusted first grayscale value, wherein the adjusted first grayscale produces an adjusted first brightness value that is equal to the brightness value of the other location;
- generating a second image signal including the adjusted first grayscale value for the valvelet to increase brightness uniformity of the image to be projected on the screen;
- and
- controlling the light valve based on the second image signal.
3 more elements
In a projection system, a method of operation, comprising:
- receiving a first image signal of an image to be projected on a screen, the first image signal including a first grayscale value to control a first valvelet of a light valve, the first valvelet is associated with a first screen location of the screen, wherein the first grayscale value is associated with a first brightness value;
- determining an adjustment factor for the first valvelet based on a brightness value of a second screen location, wherein the brightness value of the second screen location is different than the first brightness value;
- adjusting the first grayscale value by applying the adjustment factor to the first grayscale value, wherein the adjusted first grayscale value produces an adjusted first brightness value that is equal to the brightness value of the other location to increase brightness uniformity of the image to be projected on the screen;
- and
- controlling the first valvelet based on the adjusted first grayscale value.
2 more elements
A rear projection system, comprising:
- a display device including a light valve and an illumination arrangement, wherein the illumination arrangement comprises a plurality mirrors configured to direct one or more image signals onto a screen;
- and
- an image processor coupled to the display device, the image processor adapted to receive a first image signal of the image to be projected on the screen, the first image signal including a first grayscale value for a valvelet of the light valve, wherein the valvelet is configured to generate an image segment to be projected on a screen location of the screen via the plurality of mirrors with a first brightness value that corresponds to the first grayscale value, determine an adjustment factor for the valvelet based on a brightness value of another screen location, wherein the brightness value of the other screen location is different than the brightness value, adjust the first gray scale value with adjustment factor to produce an adjusted first grayscale value, wherein the adjusted first grayscale value produces an adjusted first brightness value that is equal to the brightness value of the other location, generate a second image signal including the adjusted first grayscale value for the image segment, and control the light valve contained in the display device based on the second image signal.
Dependencies are inferred from the claim text.