Display system

• US 20070164943A1
• Filed: 01/13/2006
• Published: 07/19/2007
• Est. Priority Date: 01/13/2006
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Hunter, Andrew, Collins, David, Meados, David
• Granted Patent: US 7,733,357 B2
• Time in Patent Office: Days
• US Class Current: 345/84
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/002 to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: G09G 3/346 based on modulation of the reflection angle, e.g. micromirrors micromirrors devices per se G02B26/0833

Abstract

One embodiment of a display system includes a control module that controls a position of an adjustable neutral density filter based on a calculated filter setting and that controls modulation of a set of frame data by an image modulator based on a calculated gain setting, and an image analysis module that calculates a gain setting and a filter setting for the set of frame data and forwards the calculated gain setting and the filter setting to said control module.

Claims

1. A display system, comprising:

a control module that controls a position of an adjustable neutral density filter based on a calculated filter setting and that controls modulation of a set of frame data by an image modulator based on a calculated gain setting; and

an image analysis module that calculates a gain setting and a filter setting for said set of frame data and forwards said calculated gain setting and said filter setting to said control module.

2. The system of claim 1 further comprising a frame data buffer that stores said set of frame data during calculation by said image analysis module.

3. The system of claim 1 further comprising an image modulator that receives said set of frame data from said frame data buffer, receives said calculated gain setting from said control module, and outputs a set of viewable image data, wherein said set of viewable image data comprises said set of frame data having said calculated gain setting applied thereto.

4. The system of claim 1 further comprising a movable neutral density filter that is mechanically moved to a position that corresponds to said calculated filter setting by said control module to adjust an amount of light output therethrough, wherein said filter is positioned within a projection path of said system.

5. The system of claim 1 further comprising an image data capture module that receives said set of frame data and forwards said set of frame data to said image analysis module.

6. The system of claim 5 further comprising an input module that forwards said set of frame data to said image data capture module and to said frame data buffer.

7. The system of claim 1 wherein said image analysis module calculates a gain setting and a filter setting for sequential sets of frame data and sequentially forwards a calculated gain setting and a filter setting to said control module for each of said sequential sets of frame data.

8. The system of claim 7 wherein said sequential sets of frame data comprise a video input.

9. The system of claim 1 wherein said image analysis module calculates said gain setting and said filter setting to increase a contrast ratio between pixel values of said set of frame data.

10. The system of claim 1 wherein said calculated gain setting and said calculated filter setting are applied by said control module to said set of frame data from which said calculated gain setting and said calculated filter setting are calculated.

11. A method of controlling a contrast ratio of an image, comprising:

receiving an image frame data;

conducting an image analysis of said image frame data by an image analysis module to calculate a gain setting and a filter setting;

applying said gain setting to said image frame data to control a contrast ratio of said image frame data;

adjusting an optical neutral density filter to correspond to said gain setting; and

projecting light through said filter, wherein said light corresponds to said image frame data having said gain setting applied thereto.

12. The method of claim 11 further comprising reflecting said light from an image modulator, wherein said filter is positioned in a position chosen from one of downstream of said image modulator and upstream of said modulator.

13. The method of claim 11 wherein said applying said gain setting to said image frame data to control a contrast ratio of said image frame data comprises altering said image frame data with said gain setting to define a viewable frame data

14. The method of claim 13 further comprising displaying said viewable frame data on an imaging region.

15. The method of claim 12 wherein said image modulator comprises a digital micromirror array.

16. The method of claim 11 wherein said conducting an image analysis of said image frame data by said image analysis module to calculate a gain setting comprises executing machine operable computer instructions to increase an overall dynamic range and fidelity of light utilized by said image frame data.

17. An image projection apparatus, comprising:

an image modulator that outputs light corresponding to a set of viewable image data having a controlled contrast ratio;

a set of machine operable instructions that calculates a gain setting that is applied to a set of frame data to produce said set of viewable image data; and

a set of machine operable instructions that calculates a filter light transmission setting that is applied to light output from said modulator to produce said viewable image, wherein said filter light transmission setting and said gain setting together define said viewable image data having a luminance value substantially similar to a luminance value of said set of frame data.

18. The apparatus of claim 17 further comprising an adjustable optical neutral density filter and a controller that adjusts a position of said adjustable filter to correspond to said filter light transmission setting, wherein said optical filter is chosen from one of the group consisting of a slide filter and a rotational filter, and is chosen from one of the group consisting of a discrete stepped gradient filter and a continuous gradient filter.

19. The apparatus of claim 17 further comprising a controller that applies said gain setting to said set of frame data.

20. The apparatus of claim 17 further comprising a light source that produces a light beam that is reflected by said image modulator to produce said viewable image.