1. An apparatus, comprising:
a flexible display;
a shape estimation unit to estimate a bent shape of the flexible display; and
a display control unit to correct an image based on the bent shape and to control the flexible display to display a corrected image.
2. The apparatus of claim 1, further comprising:
a bending measurement sensor to measure a bending value of a portion of the flexible display; and
a correction table to store a correction value based on the bent shape and a viewing direction of a viewer,
wherein the shape estimation unit estimates the bent shape of the flexible display based on the bending value and the display control unit corrects the image using the correction value.
3. The apparatus of claim 1, further comprising a position measurement unit to measure a viewing direction of a viewer,
wherein the display control unit corrects the image to be viewed as a planar image of a virtual planar display arranged perpendicular to the viewing direction.
4. The apparatus of claim 3, further comprising a correction table to store a correction value based on the bent shape and the viewing direction of a viewer,
wherein the display control unit corrects the image using the correction value.
5. The apparatus of claim 2, wherein the bending measurement sensor is fixed to one side of the flexible display.
6. The apparatus of claim 1, further comprising bending measurement sensors arranged at an interval in horizontal and vertical directions of the flexible display.
7. The apparatus of claim 2, wherein the bending measurement sensor comprises a load cell to change a physical force into an electrical signal, or a bend sensor having a property that increases resistance according to the bending angle of the bend sensor.
8. The apparatus of claim 1, wherein an aspect ratio of the image is proportional to an aspect ratio of the corrected image.
9. The apparatus of claim 1, wherein a size of the corrected image corresponds to a size of a projected perimeter of the flexible display.
10. The apparatus of claim 1, further comprising a fixing panel and bending measurement sensors,
wherein the bending measurement sensors are positioned between the flexible display and the fixing panel.
11. A method for displaying a corrected image, comprising:
measuring a bending value of a portion of a flexible display;
estimating a bent shape of the flexible display using the bending value;
correcting an image based on the bent shape to be viewed as a planar image of a virtual planar display arranged perpendicular to a viewing direction; and
displaying the corrected image on the flexible display.
12. The method of claim 11, further comprising:
generating a correction table to store a correction value to correct the image into the planar image of the virtual planar display based on the viewing direction and the bent shape; and
retrieving the correction value from the correction table,
wherein correcting the image comprises correcting the image using the correction value.
13. The method of claim 11, further comprising:
measuring a viewing direction of a viewer,
wherein the viewing direction is determined to maximize an area of the virtual planar display or the viewing direction is determined by capturing a position of the viewer.
14. The method of claim 13, further comprising:
generating a correction table to store a correction value to correct the image into the planar image of the virtual planar display based on the viewing direction and the bent shape; and
retrieving the correction value from the correction table,
wherein correcting the image comprises correcting the image into the corrected image using the correction value.
15. The method of claim 11, wherein the bending value is measured by a sensor, the sensor being a load cell that changes a physical force into an electrical signal, or a bend sensor having a property that increases resistance according to the bending angle of the bend sensor.
16. The method of claim 11, wherein measuring the bending value comprises measuring the bending value using sensors arranged at intervals in horizontal and vertical directions of the flexible display.
17. The method of claim 11, wherein an aspect ratio of the image is proportional to an aspect ratio of the corrected image.
18. The method of claim 11, wherein a size of the corrected image corresponds to a size of a projected perimeter of the flexible display.
19. An apparatus, comprising:
a flexible display;
a position measurement unit to measure a viewing direction of a viewer;
a shape estimation unit to estimate a bent shape of the flexible display; and
a display control unit to correct an image based on the bent shape and to control the flexible display to display a corrected image,
wherein the display control unit determines a virtual planar display based on the viewing direction of the viewer and the bent shape of the flexible display, determines a projection view of the image of the flexible display projected to the virtual planar display, corrects the image as according to the projection view, and controls the flexible display to display the corrected image.
20. The apparatus of claim 19, further comprising:
a bending measurement sensor to measure a bending value of a portion of the flexible display,
wherein the bending value is measured according to a magnitude of a force sensed by the sensor, and the display control unit corrects the image by adjusting a width of a measurement block corresponding to the sensor according to the bending value.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A synchronization establishing method of a mobile station in a mobile communication system, in which a synchronization channel is periodically sent in a downlink signal so that the mobile station, which detects the downlink signal sent from a base station, can establish synchronization to the downlink signal, said synchronization establishing method comprising:
an averaging step of averaging first correlation values in phase in complex number over a plurality of periods of the synchronization channel, and of outputting first averaged correlation values;
a powerizing step of powerizing the first averaged correlation values individually, and of outputting a first powerized correlation values; and
a peak detecting step of detecting a peak of the first powerized correlation values output.
2. The synchronization establishing method as claimed in claim 1, wherein the averaging step averages the first correlation values within an averaging window over a plurality of periods of the synchronization channel.
3. The synchronization establishing method as claimed in claim 2, further comprising a step of averaging the first powerized correlation values, and of outputting first power averaged correlation values, wherein the peak detecting step detects a peak of the first power averaged correlation values.
4. The synchronization establishing method as claimed in claim 2, wherein a number of periods of the first correlation values, over which the averaging is carried out in the averaging window, is equal to a moving unit of the averaging window.
5. The synchronization establishing method as claimed in claim 2, wherein the averaging step assigns weights at every period of the first correlation values in the averaging window.
6. The synchronization establishing method as claimed in claim 1, wherein the averaging step carries out averaging using an exponential weighting averaging method.
7. The synchronization establishing method as claimed in claim 1, wherein the averaging step makes phase correction of one of the first correlation values by using the first correlation values in a period previous to the period of the one of the first correlation values.
8. The synchronization establishing method as claimed in claim 7, wherein the averaging step assigns weights to every period of the first correlation values to which the phase correction is applied.
9. The synchronization establishing method as claimed in claim 7, wherein the powerizing step outputs real parts of the first correlation values to which the phase correction is applied.
10. The synchronization establishing method as claimed in claim 1, wherein when the synchronization channel is estimated to be transmitted alternately from two antennas, the averaging step averages second correlation values that are estimated to be transmitted from a same antenna, and outputs second averaged correlation values; and the powerizing step detects power of the second averaged correlation values to output second powerized correlation values.
11. The synchronization establishing method as claimed in claim 10, wherein the averaging step averages the first correlation values and the second correlation values separately, and the powerizing step detects power of the first averaged correlation values and power of the second averaged correlation values, and selects one of two sets of the first powerized correlation values and the second powerized correlation values.
12. The synchronization establishing method as claimed in claim 10, wherein the averaging step averages the first correlation values and the second correlation values separately, and the powerizing step detects power of the first averaged correlation values and power of the second averaged correlation values, and assigns weights to the first powerized correlation values and the second powerized correlation values at individual timings, followed by summing them up, respectively.
13. The synchronization establishing method as claimed in claim 11, wherein the powerizing step assigns weights to a maximum value of the first powerized correlation values and to a maximum of the second powerized correlation values, and selects the powerized correlation values that will give a greater maximum value.
14. The synchronization establishing method as claimed in claim 11, wherein the powerizing step selects one of two sets of the first powerized correlation values and the second powerized correlation values such that the selected one differs from the powerized correlation values selected previously.
15. The synchronization establishing method as claimed in claim 14, wherein the powerizing step makes a decision as to which one of two sets of the first powerized correlation values and the second powerized correlation values is to be selected in accordance with a number of times the two sets of the powerized correlation values are selected.
16. The synchronization establishing method as claimed in claim 14, wherein the powerizing step successively selects one of two sets of the first powerized correlation values and the second powerized correlation values by a predetermined number of times, and when synchronization is not established, it selects the other set of the powerized correlation values.
17. The synchronization establishing method as claimed in claim 10, further comprising a step of selecting the correlation values to be averaged, wherein the averaging step averages one of two sets of the first correlation values and the second correlation values selected.
18. The synchronization establishing method as claimed in claim 17, wherein the step of selecting calculates correlation between correlation values in a given period to be averaged and correlation values in a period adjacent to the given period.
19. The synchronization establishing method as claimed in claim 17, wherein the step of selecting selects the correlation values to be averaged in response to a control signal transmitted from the base station.
20. The synchronization establishing method as claimed in claim 17, wherein the averaging step carries out the averaging over a plurality of first averaging periods that are different from each other, and the powerizing step assigns weights to the plurality of powerized correlation values at individual timings, followed by summing them up.
21. The synchronization establishing method as claimed in claim 1, wherein the averaging step carries out the averaging over a plurality of first averaging periods that are different from each other, and the powerizing step selects a maximum value from the plurality of powerized correlation values.
22. The synchronization establishing method as claimed in claim 1, wherein the averaging step carries out the averaging over a second averaging period that adaptively varies.
23. The synchronization establishing method as claimed in claim 22, wherein the second averaging period is varied in response to a moving speed of the mobile station.
24. The synchronization establishing method as claimed in claim 1, wherein the averaging step carries out the averaging over a third averaging period that is varied depending on a state of the mobile station, which includes a power up state, an idle state and a traffic state of the mobile station.
25. The synchronization establishing method as claimed in claim 1, further comprising a step of outputting, when the mobile station is at power up, second power averaged correlation values by detecting powers of the correlation values of the synchronization channel first, and by averaging the powers thereafter, wherein the peak detecting step detects a peak of the second power averaged correlation values.
26. The synchronization establishing method as claimed in claim 25, wherein the averaging step carries out the averaging over a fourth averaging period that varies depending on the idle state and the traffic state of the mobile station.
27. The synchronization establishing method as claimed in claim 1, further comprising a step of outputting, when the mobile station is in one of the power up and idle state, third power averaged correlation values by detecting powers of the correlation values of the synchronization channel first, and by averaging the powers thereafter, wherein the peak detecting step detects a peak of the third power averaged correlation values.