Apparatus and method for preventing image display defects in a display device
An apparatus and a method that quickly detect an error that may occur due to an external noise occurrence during display of image data on a screen of an image display device, and that control a strobe signal output to prevent a screen defect from being displayed on the display device screen.
1. An apparatus for preventing an abnormal screen display, comprising:
a separator configured to separate a clock signal and a data signal from a clock embedded signal;
a first latch that latches the data signal;
a lock detector that receives the clock signal and outputs a lock signal at a predetermined level after comparing an Nth clock waveform and an N−1th clock waveform of the clock signal;
a control logic unit that selectively outputs a strobe signal based on the predetermined level of the lock signal;
a second latch that latches the data signal that is latched in the first latch based on the strobe signal; and,
an output section that outputs the data latched in the second latch as a panel driver signal.
2. The apparatus of claim 1 , wherein the predetermined level of the lock signal comprises a high level or a low level, and, wherein the predetermined level comprises a low level when noise is included in the data signal that is latched in the first latch.
3. The apparatus of claim 1 , wherein the lock detector is configured to output a low level lock signal when a phase of the Nth clock waveform and the N−1th clock waveform do not conform with a predetermined condition.
4. The apparatus of claim 1 , wherein the control logic unit is configured to not output a strobe signal when the predetermined level of the lock signal is a low level.
5. The apparatus of claim 4 , wherein the second latch is configured to output data of a prior scan line based when the strobe signal is not output.
6. The apparatus of claim 1 , wherein the lock detector comprises:
a first element that receives the Nth clock waveform and a −1UI fast clock of the N−1th clock waveform;
a second element that receives the N−1th clock waveform and a +UI clock of the N−1 the clock waveform; and,
a logic element that outputs a high level lock signal when a first element output value and a second element output value are larger than +1UI or smaller than −1UI.
7. The apparatus of claim 6 , wherein the first element and the second element comprise a DQ flip-flop and the logic element comprises an AND gate.
8. An apparatus for preventing an abnormal screen display, comprising:
a noise signal detector that detects a noise occurrence during driving of an image display device; and,
a display driver IC that does not output a strobe signal for a scan line that includes the noise occurrence.
9. The apparatus of claim 8 , wherein the detector is configured to compare a current clock signal and prior a clock signal to detect the noise occurrence.
10. The apparatus of claim 8 , wherein the noise signal detector outputs a lock signal having a predetermined level, and wherein the predetermined level comprises a low level when the display driver IC does not output the strobe signal.
11. A method for preventing display of an abnormal screen, the method comprising:
separating a data signal and a clock signal from a clock embedded signal;
latching the data signal every scan line based on a strobe signal;
detecting a noise occurrence based on the clock signal; and,
outputting the strobe signal based on the clock signal,
wherein the strobe signal is prevented from being output when the noise occurrence is detected.
12. The method of claim 11 , wherein the detecting the noise occurrence comprises comparing a successively applied Nth clock waveform and a N−1th clock waveform of the clock signal.
13. The method of claim 12 , wherein the strobe signal is prevented from being output when the Nth clock waveform and the N−1th clock waveform are outside of a predetermined range.
14. The method of claim 12 , further comprising:
outputting a lock signal having a predetermined level, wherein the predetermined level comprises a low level when the noise occurrence is detected.
15. The method of claim 14 , wherein the predetermined level transitions to a high level when the Nth clock waveform and the N−1th clock waveform of the clock signal are within a predetermined range.
16. The method of claim 14 , wherein said latching the data signal every scan line comprises maintaining the data signal from a scan line prior to the noise occurrence until the strobe signal is received again.