Organic light emitting display and method of manufacturing the same
An organic light emitting display including: a pixel unit to display an image, according to a data signal and a scan signal; a data driver to supply the data signal, according to a video signal; and a scan driver to supply the scan signal. The data driver includes a memory to store a corrected offset voltage and to control a voltage of the data signal according to the corrected offset voltage.
1. An organic light emitting display comprising:
a pixel unit to display an image by receiving a data signal and a scan signal;
a data driver to produce the data signal according to a video signal, and to control a voltage of the data signal according to a first offset voltage derived from optical detection of the image displayed on the pixel unit; and
a scan driver to produce the scan signal,
wherein the data driver comprises:
a memory to store the first offset voltage and controls the voltage of the data signal according to the stored offset voltage;
a shift register unit to output a control signal;
a latch unit to receive the video signal in series and to output the data signal in parallel, according to the control signal;
a level shifter to control a voltage of the data signal output from the latch unit, according to the first offset voltage stored in the memory; and
a D/A converter to receive the data signal from the level shifter, and to convert the data signal into an analog signal.
2. The organic light emitting display of claim 1 , wherein the first offset voltage corresponds to a red, a green, and a blue aspect of the video signal.
3. The organic light emitting display of claim 1 , wherein the memory is a flash memory.
4. A method of manufacturing an organic light emitting display, which displays an image corresponding to a data signal and a scan signal, the method comprising:
optically measuring a brightness of the image;
calculating a first correction value corresponding to the measured brightness and calculating a first corrected offset voltage according to the first correction value; and
storing the first corrected offset voltage in a memory of the display.
5. The method of claim 4 , wherein the calculating comprises calculating the first correction value according to a red, a green, and a blue aspect of the data signal.
6. The method of claim 4 , wherein the brightness corresponds to an initial offset voltage, and the first correction value is calculated to convert the initial offset voltage into the first corrected offset voltage.
7. The method of claim 4 , wherein the measuring of the brightness comprises measuring a chromaticity of the image, and the first correction value corresponds to the chromaticity.
8. The method of claim 4 , further comprising:
remeasuring the brightness of the image while applying the first corrected offset voltage to the display; and
recalculating the first corrected offset voltage according to the remeasured brightness.
9. The organic light emitting display of claim 1 , wherein the memory stores a second offset voltage and a third offset voltage, and the first, second, and third offset voltages respectively correspond to red, green, and blue aspects of the data signal.
10. The organic light emitting display of claim 1 , further comprising a buffer unit to store the analog signal.
11. The method of claim 4 , wherein the display produces the data signal in accordance with the first corrected offset voltage.
12. The method of claim 4 , wherein
the calculating comprises calculating a second correction value and a third correction value, and calculating a second offset voltage and a third offset voltage, according to the second and third correction values, and
the first corrected offset voltage, the second offset voltage, and the third offset voltage respectively correspond to red, green, and blue aspects of the data signal.
13. The method of claim 8 , wherein the remeasuring comprises measuring a white balance of the display, and the recalculating compensates for the white balance.
14. A correction system for an organic light emitting display to form an image according to video signal and comprising a data driver and a memory, the system comprising;
an optical sensing system to sense a brightness of the display according to an offset voltage applied to the display; and
a correction value calculating unit to calculate a correction value, according to the brightness, and to send the correction value to the memory,
wherein the correction value corresponds to a corrected offset voltage, and the corrected offset voltage corresponds to a brightness of the display within a predetermined brightness range.
15. The system of claim 14 , wherein the correction value calculating unit calculates the corrected offset voltage.
16. The system of claim 14 , wherein the correction value calculating unit recalculates the correction value when the corrected offset voltage is applied to the display.
17. The system of claim 16 , wherein the recalculated correction value is calculated according to a white balance of the display.
18. The system of claim 14 , wherein the optical sensing system determines a white balance of the display.
19. The system of claim 14 , wherein the correction value calculating unit calculates the correction value according to a red, a green, and a blue aspect of the video signal.
20. The system of claim 14 , wherein the correction value calculating unit calculates correction values corresponding to a red, a green, and a blue aspect of the video signal.