Display substrate and display apparatus having the display substrate
A display substrate includes an organic light emitting diode disposed in a light-emitting area on a base substrate, a reflection electrode disposed in a reflection area on the base substrate, a transparent electrode disposed on the reflection electrode, and a reflection control layer disposed between the reflection electrode and the transparent electrode, and configured to control a reflectivity based on driving signals applied to the reflection electrode and the transparent electrode.
1. A display substrate comprising:
an organic light emitting diode disposed in a light-emitting area on a base substrate;
a reflection electrode disposed in a reflection area on the base substrate;
a transparent electrode disposed on the reflection electrode;
a reflection control layer disposed between the reflection electrode and the transparent electrode, and configured to control a reflectivity based on driving signals applied to the reflection electrode and the transparent electrode; and
a pixel defining layer comprising a first opening formed in the light-emitting area corresponding to a first electrode of the organic light emitting diode,
wherein the first opening does not overlap the reflection electrode, the transparent electrode, and the reflection control layer.
2. The display substrate of claim 1 , further comprising:
a pixel circuit part disposed under the reflection electrode in the reflection area configured to drive the organic light emitting diode.
3. The display substrate of claim 1 , further comprising an encapsulation layer disposed on the organic light emitting diode in the light-emitting area and the reflection area, wherein the reflection electrode is disposed on the encapsulation layer.
4. The display substrate of claim 1 , further comprising:
a planarization layer comprising a via-hole through which the first electrode of the organic light emitting diode is connected to the pixel circuit part,
wherein the pixel defining layer further comprises a second opening formed in the reflection area.
5. The display substrate of claim 4 , wherein the pixel defining layer comprises a light shielding material.
6. The display substrate of claim 4 , wherein a light-emitting layer and a second electrode of the organic light emitting diode are stacked in the first opening of the light-emitting area, and the second electrode of the organic light emitting diode is disposed in the second opening of the reflection area.
7. The display substrate of claim 4 , wherein a light-emitting layer and a second electrode of the organic light emitting diode are stacked in the first opening of the light-emitting area and the second opening of the reflection area, respectively.
8. A display apparatus comprising:
a display panel comprising a display area in which a plurality of pixels is arranged and a peripheral area surrounding the display area, each of the plurality of pixels comprising a light-emitting area in which an organic light emitting diode is disposed and a reflection area in which a reflection electrode, a transparent electrode and a reflection control layer between the reflection electrode and the transparent electrode are disposed; and
a data driver circuit configured to output a data signal to drive the organic light emitting diode and driving signals to drive the reflection electrode and the transparent electrode based on an intensity of an incident light,
wherein the display panel further comprises a pixel defining layer comprising a first opening formed on the light-emitting area corresponding to a first electrode of the organic light emitting diode, and
wherein the first opening does not overlap the reflection electrode, the transparent electrode, and the reflection control layer.
9. The display substrate of claim 8 , wherein the display panel further comprises a pixel circuit part disposed under the reflection electrode configured to drive the organic light emitting diode.
10. The display substrate of claim 8 , wherein the display panel further comprises an encapsulation layer disposed in the light-emitting area in which the organic light emitting diode is disposed and the reflection area, wherein the reflection electrode is disposed on the encapsulation layer in the reflection area.
11. The display substrate of claim 8 , wherein the display panel further comprises a planarization layer comprising a via-hole through which the first electrode of the organic light emitting diode is connected to the pixel circuit part, and the pixel defining layer further comprises a second opening formed on the reflection area.
12. The display substrate of claim 11 , wherein a light-emitting layer and a second electrode of the organic light emitting diode are stacked in the first opening of the light-emitting area and at least one of the light-emitting layer and the second electrode of the organic light emitting diode is disposed in the second opening of the reflection area.
13. The display substrate of claim 11 , wherein the pixel defining layer comprises a light shielding material.
14. The display substrate of claim 11 , wherein the reflection control layer and the transparent electrode are selectively disposed in a partial area of the display area.
15. The display substrate of claim 8 , wherein when the intensity of the incident light is normal, the data driver circuit is configured to provide the reflection electrode and the transparent electrode with a first driving signal and a second driving signal equal to the first driving signal, respectively, and
when the intensity of the incident light is abnormal, the data driver circuit is configured to provide the reflection electrode and the transparent electrode with a first driving signal and a second driving signal different from the first driving signal, respectively.
16. The display substrate of claim 8 , wherein the data driver circuit comprises:
a data driving part configured to output the data signal;
a light-sensing part configured to sense the incident light and output a sensing signal; and
a control output part configured to output the first and second driving signals based on the sensing signal.
17. The display substrate of claim 8 , wherein the data driver circuit is disposed in the peripheral area of the display panel.
18. The display substrate of claim 8 , wherein the data driver circuit is disposed on a flexible circuit board, wherein an end portion of the flexible circuit board is disposed on the peripheral area of the display panel.
19. The display substrate of claim 8 , wherein the display panel further comprises a plurality of light-sensing elements arranged in the peripheral area and configured to sense a light to output a sensing signal.
20. The display substrate of claim 8 , wherein the data driver circuit comprises a data driving part configured to output the data signal; and
a control output part configured to output the first and second driving signals based on the sensing signal.