Method for the manipulation of image data for a screen

1. A method for the manipulation of image data for a display screen that can be operated in at least two modes of operation, viz B 1 for a free viewing mode, in which light is emitted by the display in an unrestricted angular range, and B 2 for a restricted viewing mode, in which light is emitted by the display in a restricted angular range, comprising the following steps:

a) switching on the operating mode B 2 ,

b) monitoring an eye position of a viewer in a given angular range A enclosing a vertical bisector of the display screen, and

setting a signal S when the eye position of the viewer signifies that the viewer is looking at the display screen, and

deleting the signal S, when the eye position of the viewer signifies that the viewer is not looking at the display screen,

c) manipulating the image data on the display screen as against an initial image data with regard to contrast, brightness, resolution, color space, cross fades and/or further image parameters, wherein the manipulation:

i. is performed to an effect that a deteriorated visual perceptibility of the image data is brought about, whereby a quality of the restricted viewing mode B 2 is enhanced,

ii. is implemented dynamically in a control unit of the display screen, and

iii. is performed exclusively during a period in which the signal S is set,

d) repeating steps b) and c) until an abort condition is reached.

2. The method as claimed in claim 1 , wherein the deteriorated visual perceptibility of the image data is brought about by, as against the initial image data, reduced contrast, diminished brightness, diminished resolution, diminished color space and/or static or dynamic cross fades.

3. The method as claimed in claim 1 , wherein the deteriorated perceptibility of the image data is modulated temporally.

4. The method as claimed in claim 3 , wherein the deterioration of perceptibility of the image increases with the period in which the signal S remains set, with the display screen being completely switched off when a presettable maximum time t during which the signal S remains set is exceeded.

5. The method as claimed in claim 1 , wherein die monitoring of the eye position is implemented by an eyetracking system.

6. The method as claimed in claim 1 , wherein the monitoring of the eye position takes into account a viewing angle of both eyes in the horizontal and/or vertical direction and the head position relative to the display screen.

7. The method as claimed in claim 1 , wherein the eye position is monitored only for viewers located horizontally within the angular range A between 90 degrees and greater than 20 degrees from the vertical bisector of the display area of the display screen and/or at a maximum distance of 1.2 m from a center point of the display area of the display screen.

8. The method as claimed in claim 1 , wherein, during the period in which the signal S is set, a text message and/or a symbol is cross-faded.

9. The method of claim 1 , wherein steps a, b, c and d are performed inside a vehicle, and the viewer is a driver of the vehicle.

10. The method as claimed in claim 1 , wherein the eye position is monitored only for viewers located horizontally within the angular range A between 90 degrees and greater than 25 degrees from the vertical bisector of the display area of the display screen and/or at a maximum distance of 1.2 m from a center point of the display area of the display screen.

11. The method as claimed in claim 1 , wherein the eye position is monitored only for viewers located horizontally within the angular range A between 90 degrees and greater than 30 degrees from the vertical bisector of the display area of the display screen and/or at a maximum distance of 1.2 m from a center point of the display area of the display screen.