Flat panel display and organic light emitting display

• US 20070057932A1
• Filed: 09/13/2006
• Published: 03/15/2007
• Est. Priority Date: 09/13/2005
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Shin, Hyun, Jin, Dong, Mo, Yeon, Jeong, Jae
• Application Number:
  US11/519,928
• Publication Number:
  US 20070057932A1
• Time in Patent Office: Days
• US Class Current: 345/204
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 50/868 Arrangements for polarized light emission H10K50/86 takes precedence
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/50 OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
• CPC Class Codes: H10K 59/8793 Arrangements for polarized light emission H10K59/8791 takes precedence

Abstract

The present invention relates to a flat panel display and an organic light emitting display which maintains an opaque state depending on a user'"'"'s desired time point or an established time point, while maintaining a transparent state at ordinary times, by forming a transparent two side emission panel and a control unit on the lower portion of the transparent two side emission panel, enabling to freely display an image in two side or one side. A flat panel display (FPD) of the present invention is constructed with a transparent two side emission panel and a control unit provided on at least one side of the transparent two side emission panel to control transmission of light. The control unit controlling an array of liquid crystal layers depending on voltage applied to the liquid crystal layers and transmission of light by a first polarizing member and a second polarizing member. As a result, the present invention maintains an opaque state depending on a user'"'"'s desired time point or an established time point, while maintaining a transparent state at ordinary times, enabling to freely display an image in two sides or one side.

Claims

1. A flat panel display (FPD) comprising:

a transparent two side emission panel; and

a control unit provided on at least one side of the transparent two side emission panel to control an array of liquid crystal layers depending on voltage applied to the liquid crystal layers and control transmission of light by a first polarizing member and a second polarizing member.

2. The FPD as claimed in claim 1, comprised of the control unit comprising:

a first polarizing member connected to a side of the transparent two side emission panel;

a first substrate connected to the first polarizing member;

a first transparent electrode connected to the first substrate;

a liquid crystal layer connected to the first transparent electrode;

a second transparent electrode connected to the liquid crystal layer;

a second substrate connected to the second transparent electrode; and

a second polarizing member connected to the lower portion of the second substrate.

3. The FPD as claimed in claim 2, further comprising a controller for applying voltage to the first transparent electrode or the second transparent electrode in the control unit.

4. An organic light emitting display (OLED) comprising:

an organic light emitting display unit including at least one organic light emitting element formed on one side of a transparent substrate; and

a control unit formed on the other side of the organic light emitting display unit to control intensity of light of the organic light emitting display unit, by controlling an array of liquid crystal layers depending on voltage applied to the liquid crystal layers and controlling transmission of light by a first polarizing member and a second polarizing member.

5. The OLED as claimed in claim 4, comprised of the control unit comprising:

a first polarizing member connected to a side of the organic light emitting element;

a first substrate connected to the first polarizing member;

a first transparent electrode connected to the first substrate;

a liquid crystal layer connected to the first transparent electrode;

a second transparent electrode connected to the liquid crystal layer;

a second substrate connected to the second transparent electrode; and

a second polarizing member connected to the lower portion of the second substrate.

6. The OLED as claimed in claim 5, further comprising a controller for applying voltage to the first transparent electrode or the second transparent electrode in the control unit.

7. The OLED as claimed in claim 6, comprised of the controller being manually driven.

8. The OLED as claimed in claim 6, comprised of the controller being automatically controlled depending on intensity of light from the external region.

9. The OLED as claimed in claim 4, comprised of the organic light emitting display unit comprising at least one transparent thin film transistor for driving the organic light emitting element.

10. The OLED as claimed in claim 9, comprised of the transparent thin film transistor comprising a transparent semiconductor layer, a gate electrode and source and drain electrodes, which are formed on the transparent substrate.

11. The OLED as claimed in claim 11, comprised of the transparent semiconductor layer being made from wide band semiconductor substances having a band gap larger than approximately 3.0 eV.

12. The OLED as claimed in claim 11, comprised of the wide band semiconductor substances being made from ZnO, ZnSnO, GaSnO, GaN or SiC.

13. The OLED as claimed in claim 11, comprising the gate electrode and the source/drain electrodes being a transparent electrode.

14. The OLED as claimed in claim 11, comprised of the gate electrode and the source/drain electrode being made from substances being both electrically conductive and optically transparent within said band gap.

15. The OLED as claimed in claim 14, comprised of the substances being made from at least one selected from group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO) and translucent metals, etc.

16. An organic light emitting display (OLED) comprising:

a transparent organic light emitting display unit including at least one organic light emitting element formed on one side of a transparent substrate; and

an electrophoretic device formed on an opposite side of the organic light emitting display unit disposed to control a position of a plurality of charged particles in dependence upon a voltage applied to the electrophoretic device and shield or transmit light emitted from the organic light emitting display unit.

17. The OLED as claimed in claim 16, comprised of the electrophoretic device comprising:

a first transparent substrate connected to one side of the transparent organic light emitting display unit;

a second transparent substrate spaced apart from the first transparent substrate and facing the first transparent substrate;

a pair of first transparent electrodes respectively mounted on the sides of the first and second transparent substrates;

a pair of second transparent electrodes respectively mounted on the ends of the first and second transparent substrates; and

the plurality of charged particles dispersed into a solvent, which serves as a light shielding layer and is filled between the first and second transparent substrates.

18. The OLED as claimed in claim 17, comprised of the charged particles being black and being made from inorganic pigment, organic pigment, carbon black, or resin containing the material.

19. The OLED as claimed in claim 17, comprised of the solvent being made from a transparent non-polar solvent such as isoparaffin, silicon oil, xylene, and toluene.

20. An organic light emitting display (OLED) comprising:

a transparent organic light emitting display unit including at least one organic light emitting element formed on one side of a transparent substrate; and

an electrochromic device formed on an opposite side of the organic light emitting display unit disposed to change a color of an electrochromic layer disposed in the electrochromic device in dependence upon a voltage applied to the electrochromic device and to shield or transmit light emitted from the organic light emitting display unit.

21. The OLED as claimed in claim 20, comprised of the electrochromic device comprising:

a first transparent substrate and a second transparent substrate in opposition to each other on other side of the transparent organic light emitting display unit and spaced apart from each other;

a first transparent electrode and a second transparent electrode respectively formed on the internal sides of the first and second transparent substrates;

the electrochromic layer filled with an electrolyte containing a coloring agent and formed between the first and second transparent electrodes;

a control unit formed between the first and second transparent electrodes.