1. An adaptive protection circuit module for an operational amplifier, the adaptive protection circuit module comprising:
an over temperature protection circuit providing a temperature protection function to power down the operational amplifier when an operating temperature of the operational amplifier increases higher than a first threshold temperature; and
an over current protection circuit providing a current protection function to limit an output current of the operational amplifier and adjusting the first threshold temperature to a second threshold temperature when the over current protection circuit is enabled,
wherein after the first threshold temperature is adjusted to the second threshold temperature, the over temperature protection circuit powers down the operational amplifier when the operating temperature of the operational amplifier increases higher than the second threshold temperature, and the second threshold temperature is lower than the first threshold temperature,
wherein the over temperature protection circuit keeps the operational amplifier in a power-down state until a power on sequence starts.
2. The adaptive protection circuit module as claimed in claim 1, wherein the over temperature protection circuit controls the operational amplifier to release from a power-down state when the operating temperature of the operational amplifier decreases lower than a third threshold temperature.
3. The adaptive protection circuit module as claimed in claim 2, wherein the over temperature protection circuit comprises:
a voltage generating circuit providing a temperature sensitive voltage and a reference voltage, wherein the temperature sensitive voltage changes along with the operating temperature, and the reference voltage is temperature insensitive;
a voltage divider unit coupled to the voltage generating circuit and dividing the reference voltage into a first threshold voltage, a second threshold voltage, and a third threshold voltage; and
a comparator unit coupled to the voltage generating circuit and the voltage divider unit, comparing the temperature sensitive voltage with the first threshold voltage, the second threshold voltage, or the third threshold voltage, and outputting a power-down signal to power down the operational amplifier based on a comparison result.
4. The adaptive protection circuit module as claimed in claim 3, wherein the over temperature protection circuit further comprises:
a switch module coupled between the voltage divider unit and the comparator unit and controlled by the over current protection circuit and the power-down signal to select and output the first threshold voltage, the second threshold voltage, or the third threshold voltage to the comparator unit.
5. The adaptive protection circuit module as claimed in claim 4, wherein the switch module is switched to select and output the first threshold voltage to the comparator unit when the operating temperature of the operational amplifier increases toward the first threshold temperature.
6. The adaptive protection circuit module as claimed in claim 4, wherein the switch module is switched to select and output the second threshold voltage to the comparator unit when the operating temperature of the operational amplifier increases toward the second threshold temperature.
7. The adaptive protection circuit module as claimed in claim 4, wherein the switch module is switched to select and output the third threshold voltage to the comparator unit when the operating temperature of the operational amplifier decreases toward the third threshold temperature.
8. The adaptive protection circuit module as claimed in claim 3, wherein the temperature sensitive voltage has a negative temperature coefficient.
9. The adaptive protection circuit module as claimed in claim 1, wherein the over temperature protection circuit controls the operational amplifier to release from the power-down state when the power on sequence starts.
10. The adaptive protection circuit module as claimed in claim 1, wherein the over temperature protection circuit powers down the operational amplifier by a power down signal, and the over temperature protection circuit comprises a latch unit to latch the power down signal.
11. The adaptive protection circuit module as claimed in claim 10, further comprising:
a power on reset circuit module providing a power on reset signal to reset the latch unit, so that the over temperature protection circuit controls the operational amplifier to release from the power-down state.
12. The adaptive protection circuit module as claimed in claim 11, wherein the power on reset circuit module comprises:
a start up circuit providing a first reset voltage to serve as the power on reset signal at a first temperature;
a bandgap circuit coupled to the start up circuit and providing a second reset voltage to serve as the power on reset signal at a second temperature; and
a logic unit coupled to the start up circuit and the bandgap circuit and outputting the first reset voltage or the second reset voltage to serve as the power on reset signal.
13. The adaptive protection circuit module as claimed in claim 12, wherein the second temperature is higher than the first temperature.
14. An adaptive protection method for an operational amplifier, the adaptive protection method comprising:
providing a current protection function to limit an output current of the operational amplifier;
providing a temperature protection function to power down the operational amplifier when an operating temperature of the operational amplifier increases higher than a first threshold temperature;
adjusting the first threshold temperature to a second threshold temperature when the over current protection function is enabled, wherein the second threshold temperature is lower than the first threshold temperature, and
keeping the operational amplifier in a power-down state until a power on sequence starts,
wherein after the first threshold temperature is adjusted to the second threshold temperature, in the step of providing the temperature protection function, powering down the operational amplifier when the operating temperature of the operational amplifier increases higher than the second threshold temperature.
15. The adaptive protection method as claimed in claim 14, further comprising:
controlling the operational amplifier to release from a power-down state when the operating temperature of the operational amplifier decreases lower than a third threshold temperature.
16. The adaptive protection method as claimed in claim 14, further comprising:
controlling the operational amplifier to release from the power-down state when the power on sequence starts.
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 apparatus for fabricating a display device, the apparatus comprising:
a substrate;
a stage on which the substrate is loaded;
a dispenser from which a sealant is applied to the substrate;
a light detector that emits light toward the substrate and detects an amount of light reflected toward the detector in real-time; and
a controller that detects a position on the substrate that is to be covered with sealant but does not have the sealant, in accordance with a signal supplied from the light detector, and controls the dispenser such that the dispenser applies the sealant to the substrate at the position.
2. The apparatus according to claim 1, further comprising:
a driver that moves the dispenser horizontally and vertically under control of the controller;
a guide line that guides the movement of the driver; and
a supplier that supplies the sealant to the dispenser.
3. The apparatus according to claim 2, wherein the controller includes a broken line detector that detects the position on the substrate that is missing the sealant in accordance with the signal supplied from the light detector and generates a position information signal for the position.
4. The apparatus according to claim 3, wherein the controller controls the driver to move the dispenser to the position on the substrate corresponding to the position information signal and the controller controls the dispenser to supply the sealant to the position.
5. The apparatus according to claim 1, wherein the controller controls the dispenser to apply the sealant to the position detected by the light detector in real-time after completing a first pass of applying of the sealant to the substrate.
6. The apparatus according to claim 1, wherein the dispenser includes a jet nozzle from which the sealant is ejected towards the substrate.
7. The apparatus according to claim 6, wherein the light detector includes:
a light-emitter that emits the light towards the sealant applied to the substrate at an angle; and
a light-receiver that receives light reflected from the substrate.
8. The apparatus according to claim 7, wherein the light-emitter is installed at one side in a lower end of the dispenser and separated from the jet nozzle by a first distance so as to face to the substrate.
9. The apparatus according to claim 8, wherein the light-receiver is installed at an opposite side to the one side in the lower end of the dispenser and separated from the jet nozzle by a second distance.
10. The apparatus according to claim 1, wherein the picture display section comprises a liquid crystal display device, a field emission display device, a plasma display panel or an electro-luminescence display device.
11. The apparatus according to claim 1, wherein the substrate comprises an upper substrate or a lower substrate of the flat panel display device.
12. A method of fabricating a display device, the method comprising:
applying a sealant to a picture display section formed on a substrate;
detecting, in real-time, a broken line in the sealant applied to the substrate; and
applying the sealant to a portion of the broken line missing sealant.
13. The method according to claim 12, wherein detecting the broken line comprises:
emitting light toward the substrate;
detecting the light reflected from the substrate;
detecting the broken line in accordance with the detected light; and
detecting a position on the substrate corresponding to the detected broken line.
14. The method according to claim 13, wherein detecting the light comprises detecting an amount of the reflected light.
15. The method according to claim 12, further comprising applying the sealant to another substrate if no broken line is present.
16. The method according to claim 12, further comprising applying the sealant to the portion only after completing a predetermined pattern containing the broken line.
17. The method according to claim 12, further comprising automatically moving back to the portion and applying the sealant to the portion.
18. An apparatus comprising:
a stage of sufficient size to receive a substrate of a display device;
a dispenser from which a sealant is dispensed toward the stage;
a source that emits energy at an oblique angle toward the stage;
a detector that detects the energy from the source that has been reflected toward the detector; and
a controller that controls the dispenser such that the dispenser traces a path while dispensing, detects a missing position along the path that does not contain the sealant in accordance with a signal supplied from the detector, and controls the dispenser such that the dispenser moves back to the missing position and applies the sealant to the missing position.
19. The apparatus according to claim 18, further comprising:
a driver that moves the dispenser along and perpendicular to a plane parallel with a surface of the stage under control of the controller;
a guide line that guides the movement of the driver; and
a supplier that supplies the sealant to the dispenser.
20. The apparatus according to claim 19, wherein the controller includes a broken line detector that detects the missing position in accordance with the signal supplied from the light detector and generates a position information signal in accordance with the missing position.
21. The apparatus according to claim 20, wherein the controller controls the driver to move the dispenser to the missing position on the substrate corresponding to the position information signal and the controller controls the dispenser to supply the sealant to the missing position.
22. The apparatus according to claim 18, wherein the dispenser applies the sealant to the missing position detected by the light detector only after the dispenser has completed a predetermined pattern.
23. The apparatus according to claim 18, wherein the dispenser comprises a nozzle, from which the sealant is ejected, on a bottom of the dispenser and the source and detector are disposed on the bottom.
24. The apparatus according to claim 23, wherein the source and detector are disposed on opposite sides of the nozzle.
25. The apparatus according to claim 18, wherein the detector detects the energy from the source that has been reflected toward the detector in real-time.
26. The apparatus according to claim 18, wherein the controller controls the dispenser such that the dispenser automatically moves back to the missing position and applies the sealant to the missing position.
27. The apparatus according to claim 18, wherein the controller detects the missing position in accordance with the signal supplied from the detector, generates a position information signal for the missing position, controls the driver to move the dispenser to the missing position on the substrate corresponding to the position information signal, and controls the dispenser to supply the sealant to the missing position.
28. The apparatus according to claim 18, wherein the controller controls the dispenser such that the dispenser applies the sealant to the missing position only after the dispenser has completed a predetermined pattern.