We claim:
1. A security seal for a closure having a locking member, said seal comprising:
(a) a electronic timepiece displaying the time and date having a power circuit, said timepiece being enclosed in a protective enclosure;
(b) a flexible strap having one end secured to said enclosure and the other end terminating at a latch member;
(c) said enclosure defining a receiver, said receiver and latch member cooperative to retain said strap upon insertion of the retaining member into said receiver; and
(d) deactivating means associated with said receiver for interrupting the power circuit causing said timepiece to stop when said retaining member is engaged.
2. The security seal of claim 1 wherein said retaining member is a barb-like member associated with one of said receiver and latch members.
3. The security seal of claim 1 wherein said protective enclosure is a polymer C material.
4. The security seal of claim 1 wherein said strap is a cut-resistant material.
5. The security seal of claim 1 wherein said seal is provided with a unique serial number.
6. The security seal of claim 1 further including an identification means for entering information concerning the use of the seal.
7. The security seal of claim 1 wherein said deactivating means includes power circuit means which are engaged by insertion of said latch.
8. The security seal of claim 7 wherein said power means comprises a switch in the timepiece power circuit.
9. The security seal of claim 1 wherein the time is displayed as GMT.
10. A security seal for a closure having a locking member, said security seal comprising:
(a) an electronic timepiece having a power circuit and a time and date display, said timepiece being enclosed in a protective enclosure defining a receiver;
(b) said timepiece having a power switch disposed in said receiver;
(c) a flexible strap having a first end secured to said enclosure and the opposite end terminating at a latch, said latch and receiver being cooperative to retain said strap upon insertion of said latch into said receiver; and
(d) said power switch and latch means being cooperative to interrupt the power to said timepiece upon insertion of the latch into the receiver thereby freezing said display to indicate the time and date of sealing.
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. An LED driving device that drives’a plurality of LEDs, comprising:
an LED driving circuit configured to drive at least one first LED to emit light and at least one second LED not to emit light;
a photodetection unit configured to detect light emission quantity of the first LED by using the second LED; and
a controller configured to adjust a light emission quantity of the first LED based on the detected light emission quantity of the first LED.
2. The LED driving device according to claim 1, wherein the second LED detects light emission quantity of the first LED by a photoelectric effect.
3. The LED driving device according to claim 1, further comprising a comparison unit configured to calculate a correction value for the light emission quantity of the first LED based on a comparison result of comparing the detected light emission quantity of the first LED with a reference value.
4. The LED driving device according to claim 1, wherein the photodetection unit detects the light emission quantity of the first LED by using a plurality of the second LEDs, and the controller adjusts the light emission quantity of the first LED based on an average value of detected light emission quantity of the first LED.
5. The LED driving device according to claim 3, further comprising a memory configured to store the correction value of each LED, wherein when the plurality of LEDs are used as light source, the light emission quantity of the LEDs is individually adjusted based on the correction value for each LED stored in the memory.
6. The LED driving device according to claim 3, wherein the LED driving device further comprises a gain adjustment circuit, the gain adjustment circuit performing compensation for the correction value based on a distance from the first LED to each of the plurality of second LEDs in a case when detecting light emission quantity of the first LED by using a plurality of second LEDs.
7. The LED driving device according to claim 1, further comprising an abnormal value detection unit for determining whether the detected light emission quantity of the first LED is normal.
8. The LED driving device according to claim 1, wherein output lines of a plurality of LEDs including the first LED and at least one second LED around the first LED are connected to the photodetection unit, and a light emission quantity detection line selection circuit is provided in the photodetection unit for selecting at least one necessary light emission quantity detection line of the second LED among the output lines of the plurality of LEDs.
9. The LED driving device according to claim 1, wherein when the LED driving device is configured to drive LEDs with a block unit, each block unit including a plurality of LEDs, the LED driving circuit used for each block comprises an input unit configured to receive a light emission quantity detection value from another block and an output unit configured to output a light emission quantity detection value to be supplied to another block if a range of the light emission of the first LED in one block extends to adjacent blocks at a time of light emission quantity detection for each LED.
10. The LED driving device according to claim 8, wherein the light emission quantity detection line selection circuit detects whether or not a voltage generated at each output line of each of the plurality of LEDs connected to the photodetection unit is equal to or higher than a threshold, and disconnects, as a light emission driving line, the output line with a voltage equal to or higher than the threshold to which a light emission driving voltage is supplied, and selects and connects, as the light emission quantity detection line, the output line with a voltage lower than the threshold to which the light emission driving voltage is not supplied.
11. A liquid crystal display apparatus with an LED driving device that a plurality of LEDs, the apparatus comprising:
the LED driving device comprising
an LED driving circuit configured to drive at least one first LED to emit light and at least one second LED not to emit light,
a photodetection unit configured to detect light emission quantity of the first LED by using the second LED, and
a controller configured to adjust a light emission quantity of the first LED based on the detected light emission quantity of the light emission of the first LED; and
a display comprising a backlight device that uses the plurality of LEDs, the light emission of which is driven by the LED driving device.