Display device with mirror function

• US 9,423,647 B2
• Filed: 07/25/2014
• Issued: 08/23/2016
• Est. Priority Date: 12/31/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Baek, Moon Jung, Cho, Jung-Hyun, Kim, Kang-Min
• Primary Examiner(s): Qi, Mike
• Application Number:
  US14/341,561
• Publication Number:
  US 20150185562A1
• Time in Patent Office: 760 Days
• Field of Search: 349/96, 349/84, 349/99, 349/113
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/1347 Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells

Abstract

A display device includes a display panel and a polarization conversion panel disposed on the display panel. The polarization conversion panel has two or more display area regions that are independently drivable in order to implement either a reflection mode or transmissive mode in each of those regions and thus enabling pattern implementation. The polarization conversion panel includes: a reflective polarizer disposed on the display panel; an absorptive polarizer facing and spaced apart from the reflective polarizer; a lower electrode(s) layer disposed on the reflective polarizer; an upper electrode(s) layer disposed on the absorptive polarizer; and liquid crystals disposed between the upper and lower electrode layers. At least one of the upper and lower electrode layers includes a respective plurality of independently drivable sub-electrodes.

Claims

1. A display device comprising:

a display panel having a display area configured to produce a displayable first image; and

a polarization conversion panel positioned on the display panel and operatively covering at least the display area of the display panel,

wherein the polarization conversion panel includes;

a reflective polarizer positioned on the display panel;

a light-passing lower electrode(s) layer positioned on the reflective polarizer;

a light-passing upper electrode(s) layer spaced apart from and facing the lower electrode(s) layer;

liquid crystals positioned between the upper and lower electrodes;

an absorptive polarizer positioned on the upper electrode; and

wherein at least one of the upper and lower electrode(s) layers is subdivided to include a respective plurality of sub-electrodes that are electrically separated from each other so as to be independently driveable by respective drive voltages, and

wherein at least one of the lower electrode(s) layer and the upper electrode(s) layer includes;

a light-passing insulating layer;

a plurality of first sub-electrodes spaced apart by a predetermined interval and disposed on an upper surface of the light-passing insulating layer; and

a plurality of second sub-electrodes spaced apart from each other while disposed on a lower surface of the light-passing insulating layer.

2. The display device of claim 1, wherein

the lower electrode(s) layer includes a plurality of sub-electrodes, and

the plurality of sub-electrodes are divided into at least two regions that are independently driveable by respective drive voltages applied thereto.

3. The display device of claim 1, wherein

the upper electrode(s) layer includes a plurality of sub-electrodes, and

the plurality of sub-electrodes are divided into at least two regions that are independently driveable by respective drive voltages applied thereto.

4. The display device of claim 1, wherein

one of the first and second sub-electrodes has a respective first shape and size covering a corresponding first planar area while the other has a respective second shape and size where at least one of the second shape and second size is different from the corresponding shape and size of the other of the first and second sub-electrodes.

5. The display device of claim 1, wherein

the upper and lower electrode(s) layers are made of a transparent conductive oxide (TCO).

6. The display device of claim 1, and further comprising:

at least two drive voltage signal sources operatively coupled to a corresponding at least two respective sub-electrodes of one of the electrode(s) layers so as to independently drive the at least two respective sub-electrodes with respective drive voltages.

7. The display device of claim 1, wherein

a first polarizer disposed between the display panel and the reflective polarizer is further included, and

transmissive axes of the first polarizer and the reflective polarizer are parallel to each other.

8. The display device of claim 7, wherein

the transmissive axis of the reflective polarizer is perpendicular to that of the absorptive polarizer.

9. The display device of claim 7, wherein

the transmissive axis of the reflective polarizer is parallel to that of the absorptive polarizer.

10. The display device of claim 7, wherein

the transmissive axis of the reflective polarizer is perpendicular to its reflective axis.

11. A manufacturing method of a display device, comprising:

providing a display panel configured to form a first displayable image;

disposing a reflective polarizer on the display panel;

disposing an absorptive polarizer to be spaced apart from and facing the reflective polarizer;

providing an upper electrode(s) layer and a lower electrode(s) layer respectively positioned on the reflective polarizer and under the absorptive polarizer; and

providing liquid crystals between the upper and lower electrode(s) layers, wherein

at least one of the upper and lower electrode(s) layers includes a respective plurality of sub-electrodes that are electrically separated from each other, and

wherein at least one of the lower electrode(s) layer and the upper electrode(s) layer includes;

a light-passing insulating layer,

a plurality of first sub-electrodes spaced apart by a predetermined interval and disposed on an upper surface of the light-passing insulating layer, and

a plurality of second sub-electrodes spaced apart from each other while disposed on a lower surface of the light-passing insulating layer.

12. The method of claim 11, wherein

the plurality of sub-electrodes are disposed within at least two different regions of a display area of the display panel and are operatively coupled to receive a corresponding at least two independent drive voltages for respectively controlling the at least two different regions.

13. The method of claim 12, wherein

the two independent drive voltages are configured such that one of the at least two regions is driven in a reflection mode and the other in a transmissive mode.

14. The method of claim 11, wherein

one of the first and second sub-electrodes is formed in a shape and/or size different from that of the other.

15. The method of claim 11, wherein

the upper and lower electrode layers are formed of a transparent conductive oxide (TCO).

16. The method of claim 11, further comprising

providing a first polarizer disposed between the display panel and the reflective polarizer.