Dual display device with vertical structure
View Patent ↗Disclosed is a dual display device having a vertical structure, in which a reflective display device and a self-emissive display device are formed on one substrate in a vertical structure so as to enable a reflective display or a self-emissive display according to a situation and provide a high resolution display. The dual display device having a vertical structure includes: a thin film transistor formed on a substrate; a white light emitting device formed on the thin film transistor: a reflection adjusting layer formed on the white light emitting device; and a color converting layer formed on the reflection adjusting layer.
1. A dual display device having a vertical structure, comprising:
a thin film transistor formed on a substrate;
a white light emitting device formed on the thin film transistor;
a reflection adjusting layer formed directly on the white light emitting device, and partially covering the white light emitting device, the reflection adjusting layer being a single layer formed of an electrochromic material or a nano material; and
a color converting layer formed on the reflection adjusting layer.
2. The dual display device of claim 1 , wherein the reflection adjusting layer changes reflectivity by association with an output signal of the thin film transistor.
3. The dual display device of claim 1 , wherein the reflection adjusting layer is driven in a passive matrix type so that the reflection adjusting layer is driven by an electric signal applied between upper and lower electrodes.
4. The dual display device of claim 2 , wherein when the reflection adjusting layer is switched to a self-emissive mode, the reflection adjusting layer does not perform a reflectivity adjusting function associated with an output signal of the thin film transistor, but is maintained in a state of low reflectivity and high transmittance.
5. The dual display device of claim 4 , wherein a voltage in a range of 0 V to 50 V is applied to the reflection adjusting layer to change the reflectivity in a range of 0% to 99%.
6. The dual display device of claim 4 , wherein the nano material has any one form of a nano particle, a nano wire and a nano rod.
7. The dual display device of claim 6 , wherein the nano material includes silicon (Si).
8. The dual display device of claim 6 , wherein the reflectivity is adjusted according to an amount of lithium entering and coming out from the nano particle by applying a voltage to the nano material.
9. The dual display device of claim 1 , wherein the color converting layer is formed of a color filter or a quantum dot device.
10. The dual display device of claim 9 , wherein the quantum dot device is formed of a composite including the quantum dot device and one or more types of auxiliary materials.
11. The dual display device of claim 1 , wherein the white light emitting device is an organic white light emitting diode (OLED), an inorganic LED or a Q-LED.
12. The dual display device of claim 1 , wherein a white light from the white light emitting device is converted into a red color light, a green color light and a blue color light through the color converting layer.
13. The dual display device of claim 1 , wherein the reflection adjusting layer includes a thermal conductive material for discharging heat converted from light absorbed by the reflection adjusting layer.