Mirror display

• US 10,222,888 B2
• Filed: 05/25/2017
• Issued: 03/05/2019
• Est. Priority Date: 05/30/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Nam, Sangjin, Kim, Kyujin, Yoo, Seungjin
• Primary Examiner(s): Sharifi-Tafreshi, Koosha
• Application Number:
  US15/605,742
• Publication Number:
  US 20170344166A1
• Time in Patent Office: 649 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/133567 on the back side
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13471 in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells G02F1/13475 takes precedence
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 2203/02 reflective
• CPC Class Codes: G02F 2203/66 Normally white display, i.e. the off state being white
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general

Abstract

A mirror display is described. The mirror display includes a plurality of first electrodes disposed on a first substrate, a plurality of sensor lines disposed on the first substrate, the plurality of sensor lines connected to the plurality of first electrodes, a plurality of second electrodes disposed on a second substrate, the plurality of second electrodes facing the first substrate, a liquid crystal layer interposed between the plurality of first electrodes and the plurality of second electrodes, a plurality of mirror driving lines on the second substrate, the plurality of mirror driving lines connected to the plurality of second electrodes, and a reflective polarizing film attached to the second substrate.

Claims

1. A mirror display comprising:

a mirror panel including;

a first substrate;

a plurality of first electrodes on the first substrate;

a plurality of sensor lines on the first substrate, the plurality of sensor lines connected to the plurality of first electrodes;

a second substrate;

a plurality of second electrodes on the second substrate, the plurality of second electrodes facing the first substrate;

a liquid crystal layer interposed between the plurality of first electrodes and the plurality of second electrodes;

a plurality of mirror driving lines on the second substrate, the plurality of mirror driving lines connected to the plurality of second electrodes; and

a reflective polarizing film attached to the second substrate,

a mirror panel driver configured to apply a sensor driving signal to the plurality of first electrodes through the plurality of sensor lines to sense a touch on the mirror panel, and apply a mirror driving signal to the plurality of second electrodes through the plurality of mirror driving lines, the mirror driving signal selecting either a mirror mode or a display mode of the mirror panel;

a display panel on the mirror panel, the display panel configured to display an input image; and

a display panel driver configured to write data of the input image to pixels of the display panel through data lines.

2. The mirror display of claim 1, wherein the plurality of first electrodes and the plurality of second electrodes of the mirror panel are divided into a plurality of blocks having a predetermined size.

3. The mirror display of claim 2, wherein the mirror driving signal of the mirror mode is applied to a first set of second electrodes from the plurality of second electrodes that is included in a first block and drives the first set of second electrodes in the mirror mode, and the mirror driving signal of the display mode is applied to a second set of second electrodes from the plurality of second electrodes that is included in a second block and drives the second set of second electrodes in the display mode while the first set of second electrodes is driven in the mirror mode.

4. The mirror display of claim 3, wherein light incident from external light is reflected on a portion of the reflective polarizing film corresponding to the first block while the first set of second electrodes is driven in the mirror mode, and

wherein light from the display panel passes through a portion of the reflective polarizing film corresponding to the second block while the second set of second electrodes is driven in the display mode.

5. The mirror display of claim 4, wherein the mirror panel is a liquid crystal panel driven in a normally white mode.

6. The mirror display of claim 5, wherein the mirror driving signal is in a same phase as the sensor driving signal responsive to the mirror driving signal being in the display mode, and the mirror driving signal has a phase that is reversed from a phase of the sensor driving signal responsive to the mirror driving signal being in the mirror mode.

7. The mirror display of claim 6, wherein an alternating current (AC) signal having a same phase as the sensor driving signal is applied to the plurality of first electrodes that do not receive the sensor driving signal.

8. The mirror display of claim 1, wherein the sensor driving signal is not generated responsive to an inversion of a polarity of the mirror driving signal.

9. The mirror display of claim 1, further comprising:

a polarizing film attached to the first substrate.

10. A mirror display panel comprising:

a first substrate;

a plurality of first electrodes on the first substrate;

a plurality of sensor lines on the first substrate, the plurality of sensor lines connected to the plurality of first electrodes;

a second substrate;

a plurality of second electrodes on the second substrate, the plurality of second electrodes facing the first substrate;

a liquid crystal layer interposed between the plurality of first electrodes and the plurality of second electrodes;

a plurality of mirror driving lines on the second substrate, the plurality of mirror driving lines connected to the plurality of second electrodes;

a reflective polarizing film attached to the second substrate; and

a display panel on the mirror panel, the display panel configured to display an input image by writing data of the input image to pixels of the display panel via data lines.

11. The mirror display panel of claim 10, further comprising:

a polarizing film attached to the first substrate.

12. The mirror display panel of claim 10, wherein the plurality of first electrodes and the plurality of second electrodes of the mirror panel are divided into a plurality of blocks having a predetermined size.

13. The mirror display panel of claim 10, wherein the mirror display panel is a liquid crystal panel driven in a normally white mode.

14. A mirror display panel comprising:

a first substrate;

a plurality of first electrodes on the first substrate;

a second substrate;

a plurality of second electrodes on the second substrate that face the first substrate, the plurality of second electrodes comprising a first set of second electrodes and a second set of second electrodes;

a liquid crystal layer interposed between the plurality of first electrodes and the plurality of second electrodes;

a plurality of mirror driving lines on the second substrate, the plurality of mirror driving lines comprising a first set of mirror driving lines and a second set of mirror driving lines, the first set of mirror driving lines connected to the first set of second electrodes, and the second set of mirror driving lines connected to the second set of second electrodes; and

a plurality of sensor lines on the first substrate, the plurality of sensor lines connected to the plurality of first electrodes,

wherein the first set of second electrodes reflect external light incident on the first set of second electrodes responsive to the first set of second electrodes receiving a mirror driving signal in a mirror mode via the first set of mirror driving lines, and

wherein the second set of second electrodes passes light received from a display panel that is on the mirror display panel while the first set of second electrodes reflects external light responsive to the second set of second electrodes receiving the mirror driving signal in a display mode via the second set of mirror driving lines.

15. The mirror display panel of claim 14, wherein the plurality of first electrodes receive via the plurality of sensor lines a sensor driving signal for sensing a touch on the mirror display panel.

16. The mirror display panel of claim 14, further comprising:

a polarizing film attached to the first substrate.

17. The mirror display panel of claim 14, wherein the plurality of first electrodes and the plurality of second electrodes of the mirror panel are divided into a plurality of blocks having a predetermined size.

18. The mirror display panel of claim 17, wherein each of the plurality of first electrodes is overlapped by a corresponding one of the plurality of second electrodes.

19. The mirror display panel of claim 14, wherein the mirror display panel is a liquid crystal panel driven in a normally white mode.