Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N17/00—Diagnosis, testing or measuring for television systems or their details
  • H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2320/00—Control of display operating conditions
  • G09G2320/06—Adjustment of display parameters
  • G09G2320/0693—Calibration of display systems

Definitions

• the present invention relates to a universal test system capable of controlling a plurality of parameters relating to the operation of optoelectronic information presentation display devices of various types. It is equally applicable to screen displays, for example cathode ray tube (CRT), liquid crystal display (LCD), or even plasma, to devices in which the image is projected to infinity such as for example, Head Up Display (HUD), windshield projection displays, or even Helmet Mounted Display (HMD).
• CTR cathode ray tube
• LCD liquid crystal display
• plasma to devices in which the image is projected to infinity
• HUD Head Up Display
• windshield projection displays or even Helmet Mounted Display (HMD).
• HMD Helmet Mounted Display
• the object of the invention is more particularly to allow a characterization of these information presentation devices, by means of a single easy-to-use sensor that makes it possible, in automatic mode, to carry out all the necessary measurements and tests.
• this characterization namely in particular, but not exclusively:
• this over-equipment generates additional costs, in particular for the maintenance of test facilities and the management of obsolescence.
• these test means frequently involve several sensors each assigned to a type of measurement performed.
• the sensor used will be a luminance meter; a colorimetric measurement will involve a colorimeter; for precision measurements, use a high resolution small field sensor; for standard geometric measurements, the sensor used will be a medium-resolution large-field sensor; some measures such as those relating to the detection of defective pixels or the analysis of basic patterns are usually done in manual mode.
• the document WO 02/39 753 describes, for its part, a device for the test of liquid crystal display devices which uses light source means illuminating the display laterally and a camera arranged to receive, via a polarizer and a filter, a fraction of the light reflected by the display.
• a processor analyzes the image received by the camera to verify a number of criteria. This device is therefore used specifically for liquid crystal displays and is not suitable for other types of displays.
• the object of the invention is therefore more particularly to eliminate these drawbacks by using a single sensor that automatically or semi automatically performs all of the usual measurements and tests on most display devices or viewers on the market. , in a way to :
• test system involving as a single universal sensor, a conventional type digital camera controllable remotely from a computer system comprising a processor and a human / machine interface such as a keyboard / screen assembly, this camera having a possibly variable focus lens whose development can be done automatically through a telemetric device (for example of the "autofocus" type), said processor being itself coupled, thanks to remote transmission means, to the presentation device to be tested, means being provided for arranging the camera with respect to the presentation device that one wishes to test, preferably coaxially with it.
• a telemetric device for example of the "autofocus" type
• the processor is then programmed to perform a sequence comprising the following operating phases:
• a self-positioning phase comprising the control by the processor of the display or projection by the positioning marker presentation device, the analysis of the image obtained by the camera and the control by the processor of the positioning means according to the results of said analysis,
• a possible calibration phase to bring about, for example by adjusting the focal length of the objective, the image generated by the presentation device to occupy a predetermined area of the digital photograph taken by the camera (for example, the whole Photo),
• test phase during which the processor executes at least one test sequence comprising the application by the processor to the display system, stimuli that may consist of information to be displayed and / or commands intended to modify parameters of operation of the display and then, following the application of stimuli, the taking of a digital photograph by the camera and the analysis of the photograph thus taken so as to determine at least one parameter of operation of the presentation device, this test sequence being repeated, with appropriate stimuli for each of the parameters of the presentation device that is to be verified.
• the processor will be programmed to execute test sequences appropriate to all types of presentation device that is to be tested.
• the system may comprise means for identifying the type of apparatus to be tested and means for determining, following this identification, the corresponding test sequence to be executed.
• the single figure is a schematic representation of a test system mounted on a bench.
• test system consists of a bench 1 carrying two support structures 2, 3, namely:
• a support structure 2 of a camera 4 with the possibility of adjustment in position, along the longitudinal axis X, X 'of the bench and along an axis Y, Y' perpendicular to the plane of this bench, a support structure 3 of a presentation device 5 (shown schematically by a parallelepiped block), with possibility of adjustment in orientation around a vertical axis V, V (perpendicular to the plane of the bench 1) and a horizontal axis H , H '(parallel to said bank 1).
• the support structure 2 comprises a base 6 of C-shaped section lying whose core is fixed on the bench 1 and which supports a carriage 7 movable along longitudinal rails 8, 9 constituted by cylindrical rods horizontal members fixed by their ends on the parallel flanges of the base 6.
• the actuation of the carriage 7 along the slides 8, 9 is provided by a screw actuator rotated by an electric motor housed in the carriage 7.
• the trolley 7 supports a bracket 10 carrying vertical slides 11, 12 along which the camera 4 can slide, thanks to a connecting piece (not shown) provided at the rear of the camera.
• the movements of the camera 4 along the slides 11, 12 are provided by a screw actuator driven by a motor 13 integral with the bracket 10.
• the support structure 3 consists of a support piece 14 of U-shaped section whose core is rotatably mounted on the bench 1 about the vertical axis V, V via a base 15 housing a motor for rotating the workpiece 14.
• the presentation device 5 is mounted in a support and fixing frame 16 rotatably mounted between the wings of the support piece 14, around the horizontal axis, by means of two coaxial journals 17, 18 passing through corresponding orifices of the two wings.
• the rotational drive of the presentation device 5 is then provided by means of a geared motor 19 in engagement with the pin 18.
• the digital camera 4 is a digital camera with the usual functions of a professional type device. It has a lens with variable focus (optical zoom / electronic zoom) and the focus can be achieved automatically through a telemetry system (autofocus).
• This digital camera 4 is connected for example via a USB connection to a processor 20 provided with software designed to provide the controls of the camera 4, or manually, via a human / machine interface 21 (here a keyboard / screen console), or automatically, according to a predetermined operating sequence.
• a processor 20 provided with software designed to provide the controls of the camera 4, or manually, via a human / machine interface 21 (here a keyboard / screen console), or automatically, according to a predetermined operating sequence.
• the presentation device 5 is connected to the processor, which is further programmed to execute a test sequence comprising the application to the stimulus presentation device which may consist of information to be displayed and / or commands to modify operating parameters of this device.
• the processor 20 is further programmed to control the motors of the actuators of the two support structures via appropriate links to allow an operator to make all the settings from the keyboard console. /screen.
• the adjustment of the position of the display device can be carried out automatically in self-positioning mode for example by displaying (or projecting) positioning marks (grid or chart) on the device for presentation and analysis of the image supplied by the device, then appropriate control of the actuators by the processor 20.
• the processor 20 controls the focusing of the camera 4.
• a first step it adjusts the focal length of the camera 4 so that the image made by the display 5 occupies a predetermined area of the picture taken by the camera 4 (preferably the whole picture). He then proceeds to the development (thanks to his telemetering device) so as to obtain a photo as clear as possible.
• the processor 20 performs one or more test sequences each comprising the application to the stimulus presentation device which can for example lead to the display by the device of information such as grids or patterns and / or commands to modify the operating parameters of this device (such as luminance, chrominance, contrast, smoothing, line thickness ).
• the processor 20 controls one or more shots and the transfer of digital data relating to photographs taken in his own memories. He then performs an image analysis of these photographs in order to perform the characterization of the presentation device.
• This characterization could possibly be associated with an autotune and autotune process of the presentation device 5.
• the invention can be used both as part of a quality control at the end of the production line, for example in order to detect and possibly eliminate defective devices, as part of a maintenance. .
• the system according to the invention may be installed on site, for example in the cockpit of an aircraft to test the devices. of display and visualization of this site.
• the system according to the invention may be installed on site, for example in the cockpit of an aircraft to test the devices. of display and visualization of this site.
• the fixity of the display devices only means for positioning or autopositioning of the camera mounted on the structure of the cockpit must be provided.

Landscapes

• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• General Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• Health & Medical Sciences (AREA)
• Biomedical Technology (AREA)
• Computer Hardware Design (AREA)
• Physics & Mathematics (AREA)
• General Health & Medical Sciences (AREA)
• Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
• Studio Devices (AREA)
• Selective Calling Equipment (AREA)
• Testing Of Optical Devices Or Fibers (AREA)
• Control Of Indicators Other Than Cathode Ray Tubes (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38596751

Family Applications (1)

Country Status (10)

Families Citing this family (15)

Family Cites Families (48)

• 2007
  • 2007-03-22 FR FR0702084A patent/FR2914099B1/fr active Active
• 2008
  • 2008-03-21 CA CA002681052A patent/CA2681052A1/fr not_active Abandoned
  • 2008-03-21 WO PCT/FR2008/000385 patent/WO2008135664A1/fr active Application Filing
  • 2008-03-21 JP JP2009554064A patent/JP2010522347A/ja active Pending
  • 2008-03-21 CN CN200880014078A patent/CN101682798A/zh active Pending
  • 2008-03-21 EP EP08787832A patent/EP2130385A1/fr not_active Ceased
  • 2008-03-21 RU RU2009138941/09A patent/RU2009138941A/ru unknown
  • 2008-03-21 UA UAA200910620A patent/UA95673C2/ru unknown
  • 2008-03-21 US US12/532,580 patent/US8339464B2/en active Active
• 2009
  • 2009-09-17 IL IL201041A patent/IL201041A0/en unknown

Non-Patent Citations (1)

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