Dual display device with vertical structure

Patent metadata

Field	Value
Publication number	US-9299758-B2
Application number	US-201313960413-A
Country	US
Kind code	B2
Filing date	Aug 6, 2013
Priority date	Aug 7, 2012
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

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.

First claim

What is claimed is:

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.

Assignees

• Korea Electronics Telecomm

Inventors

• Park Sang Hee
• Hwang Chi Sun

Classifications

• H10K59/878

  comprising reflective means · CPC title

• H10K59/128

  comprising two independent displays, e.g. for emitting information from two major sides of the display · CPC title

• G02F1/133553 Primary

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• H01L27/3267 Primary

  Electricity · mapped topic

• H01L51/5271

  Electricity · mapped topic