Stereoscopic image display and method of driving the same

1. A stereoscopic image display comprising:

a display panel;

a polarization control panel that is positioned on the display panel and controls a polarization direction of light incident from the display panel;

a lens panel positioned on the polarization control panel and having a plurality of lens shaping portions;

a first driver that drives the display panel;

a second driver that supplies a polarization control driving voltage through a first point to an electrode of the polarization control panel;

a timing controller that controls the first driver and the second driver; and

a sensing unit that is electrically connected to the polarization control panel and the timing controller and that senses the polarization control driving voltage supplied to the polarization control panel and outputs a decision signal for deciding whether the sensed driving voltage is in normal condition or abnormal condition, the sensing unit outputting the decision signal to the timing controller,

wherein the sensing unit senses the polarization control driving voltage through a second point of the electrode of the polarization control panel that is farthest away from the first point of the electrode of the polarization control panel to which the polarization control driving voltage is supplied.

2. The stereoscopic image display of claim 1 , wherein the sensing unit outputs the decision signal based on a comparison result between the sensed polarization control driving voltage and an internal reference voltage.

3. The stereoscopic image display of claim 1 , wherein the sensing unit comprises:

a filter that smoothes the sensed polarization control driving voltage to be close to a DC level; and

a comparator that compares a filtering voltage output from the filter and an internal reference voltage and outputs the decision signal.

4. The stereoscopic image display of claim 1 ,

wherein the sensing unit comprises:

a filter that smoothes the sensed polarization control driving voltage to be close to a DC level; and

a comparator that compares a filtering voltage output from the filter and an internal reference voltage and outputs the decision signal.

5. The stereoscopic image display of claim 1 ,

wherein the timing controller extracts an alarm data signal corresponding to an abnormal signal from an internal memory and supply the extracted alarm data signal to the display panel through a data driver.

6. The stereoscopic image display of claim 1 ,

wherein the timing controller analyzes the decision signal, and controls the display panel to display a black image or an alarm if the polarization control panel is detected as abnormal.

7. A method of driving a stereoscopic image display, the method comprising:

driving a display panel;

supplying a polarization control driving voltage to a first point of an electrode of a polarization control panel that is positioned on the display panel and controls a polarization direction of light incident from the display panel;

sensing the polarization control driving voltage supplied to the polarization control panel and deciding whether the sensed polarization control driving voltage is in normal condition or abnormal condition;

outputting a decision signal to a timing controller, the decision signal indicating whether the sensed polarization control driving voltage is in normal condition or abnormal condition; and

if the sensed polarization control driving voltage is detected as abnormal, switching a screen of the display panel to abnormal mode,

wherein, the sensed polarization control driving voltage is obtained from a second point of the electrode of the polarization control panel that is farthest away from the first point of the electrode of the polarization control panel to which the polarization control driving voltage is supplied; and

wherein in the switching of the screen of the display panel, a black image or an alarm is displayed on the display panel.