US5488391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for the optimizing of the performance characteristics of a liquid crystal display matrix screen as a function of the angle of observation
Assignee: Thales Avionics SAS
•
Filing: 1992-10-19
•
Granted: 1996-01-30
•
Expires: 2012-10-19
Abstract
Abstract The disclosed device comprises an image circuit formed by an image generator, a micro-zone processing unit, a screen interface and an LCD screen. To optimize the performance characteristics of the screen as a function of the angle of observation, the position of the observer is detected (by a detector) and, as a function of this position, the appropriate profile of luminosity of the micro-zones of the screen is selected.
Inventors
- 👤 Jean-Jacques Favot
- 👤 Jean-Pierre Fontan
- 👤 Jean-Noel Perbet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:41
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G2320/00; G09G2320/02; G09G2320/028
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
187 words
A method for the optimizing of the performance characteristics of a liquid crystal display matrix screen as a function of an angle of observation of an image on the screen by an observer, comprising the steps of: representing the observation space before the screen as a hemisphere and dividing the observation space into elementary zones corresponding to different angular positions, relative to the screen, in which the observer may be placed in order to look at the image, associating a particular processing operation of the image to be shown on the screen with each zone; determining, for each zone, a set of micro-zones that are each formed by several pixels of the screen; determining, for elementary zones, a luminance level of each pixel and a chrominance level of each micro-zone of the screen memorizing the determined values; then, detecting a position of the observer with respect to the screen; and modifying at least one of the parameters of the processing of the image to be presented on the screen as a function of the values that are memorized and that correspond to the detected angle of observation.
Claim 2
Independent Claim
187 words
A method for the optimizing of the performance characteristics of a liquid crystal display matrix screen as a function of an angle of observation of an image on the screen by an observer, comprising the steps of: representing the observation space before the screen as a hemisphere and dividing the observation space into elementary zones corresponding to different angular positions, relative to the screen, in which the observer may be placed in order to look at the image, associating a particular processing operation of the image to be shown on the screen with each zone; determining, for each zone, a set of micro-zones that are each formed by several pixels of the screen; determining, for elementary zones, a luminance level of each pixel and a chrominance level of each micro-zone of the screen memorizing the determined values; then, detecting a position of the observer with respect to the screen; and modifying at least one of the parameters of the processing of the image to be presented on the screen as a function of the values that are memorized and that correspond to the detected angle of observation.
Claim 3
Dependent Claim
17 words
A method according to claim 1, wherein the elementary zones are demarcated by longitudinal latitudinal angular limits.
Claim 4
Dependent Claim
168 words
A method according to claim 2, wherein the step of detecting the position of the observer with respect to the screen Comprises determining by means of a sensor which gives the observers coordinates in a system of spatial Cartesian coordinates relative to the screen, and converting those coordinates into two angles relative to the screen, said two angles including an angle α between a vertical plane normal to the screen and passing through the center of the screen and a vertical plane passing through the center of the screen and through the sensor, and an angle (β) between a horizontal plane normal to the screen add passing through the center of the screen and a plane passing through the sensor and through the center of the screen, these angles defining the direction of observation, and further comprising the steps of; comparing these angles with the angular limits of the elementary zones to determine the elementary zone corresponding to the observer's position; and activating processing corresponding to this zone.
Claim 5
Independent Claim
27 words
A method according to one of the above claims, wherein action is taken on at least one of the following parameters of the screen: luminance or chrominance.
Claim 6
Independent Claim
114 words
A device for optimizing the performance characteristics of a liquid crystal display matrix screen, comprising: a detector for detecting an observer's relative angular position relative to a direction which is perpendicular to a surface of the screen; a processor for determining from the relative angular position of the observer, angle weighting control signals for controlling image production on the screen as a function of the relative angular position, said processor coupled to said detector; an image characteristic weighting unit, coupled to an output of said processor, for weighting image generation signals according to the determined angle weighting control signals, the weighting image generation signals coupled to said screen for providing images on the screen.
Claim 7
Independent Claim
114 words
A device for optimizing the performance characteristics of a liquid crystal display matrix screen, comprising: a detector for detecting an observer's relative angular position relative to a direction which is perpendicular to a surface of the screen; a processor for determining from the relative angular position of the observer, angle weighting control signals for controlling image production on the screen as a function of the relative angular position, said processor coupled to said detector; an image characteristic weighting unit, coupled to an output of said processor, for weighting image generation signals according to the determined angle weighting control signals, the weighting image generation signals coupled to said screen for providing images on the screen.
Claim 8
Dependent Claim
25 words
A device according to claim 5, wherein said processor comprises memories for storing angle weighting control signals for different relative angular positions of the observer.
References Cited (Backward Citations)
US4390244A
Cited
US4385807A
Cited
US4430650A
Cited
US4427997A
Cited
US4525709A
Cited
US4525708A
Cited
US4535327A
Cited
US4569575A
Cited
US4818052A
Cited
US4722601A
Cited
US4701021A
Cited
US4668051A
Cited
US4649504A
Cited
GB2173079A
Cited
US4653858A
Cited
US4732873A
Cited
US4810637A
Cited
US4870486A
Cited
US4824216A
Cited
EP0272018A2
Cited
US5014982A
Cited
EP0305287A1
Cited
US5053764A
Cited
US4897715A
Cited
US5172222A
Cited
EP0420727A1
Cited
US5157548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-29 | 1999-07-31 | 2000-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-29 | 2003-07-31 | 2004-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-29 | 2007-07-31 | 2008-01-30 | $7700.00 | Window Closed / Lapsed |