What is claimed is:
1. A method for repairing defects in a normally white liquid crystal display, the method comprising:
applying power to the liquid crystal display; backlighting the liquid crystal display while power is applied;
locating a defective pixel in the liquid crystal display while power is applied;
focusing a laser on a portion of a color filter corresponding to the defective pixel; and
at least partially ablating the portion of the color filter corresponding to the defective pixel using the laser.
2. The method of claim 1, wherein the step of locating further comprises locating electrically open pixels while applying power to the normally white liquid crystal display.
3. The method of claim 2, wherein the locating step comprises using a color vision system to locate the defective pixel.
4. The method of claim 1, wherein the step of ablating comprises using a controller to control the laser to ablate the portion of the color filter.
5. The method of claim 1, wherein the step of focusing further comprises focusing a laser having a wavelength in the visible range.
6. The method of claim 1, wherein the step of ablating further comprises darkening the portion of the color filter corresponding to the defective pixel.
7. The method of claim 1, wherein the steps of locating, focusing and ablating are repeated for a plurality of defects on the liquid crystal display.
8. An apparatus for repairing defects in a normally white liquid crystal display (LCD), the apparatus comprising:
a backlight adapted to illuminate the LCD;
a power source adapted to provide power to the LCD such that non-defective pixels will block transmission of light through the LCD;
a vision system adapted to locate defective pixels while power is applied to the LCD;
a laser providing a laser light output;
a motion control system coupled to the laser and adapted to control motion of the laser; and
a controller adapted to control the laser to ablate a portion of the color filter corresponding to a location of each defective pixel.
9. The apparatus of claim 8, wherein the laser has a wavelength in the visible range.
10. The apparatus of claim 8, wherein the vision system includes a camera equipped with automatic focus and automatic zoom that scans the LCD.
11. The apparatus of claim 8, wherein the laser includes a mask to block laser light from ablating portions of the color filter associated with non-defective pixels.
12. An apparatus for repairing defects in a normally white liquid crystal display (LCD), the apparatus comprising:
pixel defect location means for identifying a location of a defective pixel; and
ablation means for ablating a portion of a color filter corresponding to the location of the defective pixel.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A preamble transmission method performed by a user equipment in a wireless communication system, the method comprising:
detecting an occurrence of an event; and
transmitting a preamble corresponding to the detected event to a network through a random access channel (RACH).
2. The method of claim 1, wherein the user equipment for transmitting the preamble is in an RRC_IDLE state.
3. The method of claim 1, wherein the preamble is a preamble dedicated to the event.
4. The method of claim 1, wherein the detecting of the event occurrence is performed on the basis of a first threshold value.
5. The method of claim 4, wherein the first threshold value is received from the network by using system information.
6. The method of claim 3, wherein the dedicated preamble is repetitively transmitted within a range of the maximum number of times of transmission.
7. The method of claim 4, wherein the first threshold value is a default value.
8. The method of claim 4, wherein the detecting of the event occurrence detects a case where channel quality between the network and the user equipment is decreased to be less than or equal to the first threshold value.
9. The method of claim 4, wherein the detecting of the event occurrence detects a case where a remaining battery amount of the user equipment is decreased to be less than or equal to the first threshold value.
10. The method of claim 1, wherein the detecting of the event occurrence detects an invasion.
11. The method of claim 10, wherein upon detecting the invasion, at least one of an invader image, a detection time, and a detection place is included and transmitted.
12. The method of claim 9, wherein if the remaining battery amount of the user equipment is decreased to be less than or equal to the first threshold, an identifier (ID) of the user equipment is further included and transmitted.
13. The method of claim 9, wherein if the remaining battery amount of the user equipment is detected between the first threshold value and a second threshold value different from the first threshold value, the first threshold value and the second threshold value are transmitted.
14. The method of claim 1, wherein the detecting of the event occurrence detects a jamming.
15. The method of claim 14, wherein in the detecting of the jamming, at least one of a location of the user equipment, a jamming detection time, and a jamming signal strength is included and transmitted.