Double-sided display and control method thereof

• US 9,620,575 B2
• Filed: 04/27/2015
• Issued: 04/11/2017
• Est. Priority Date: 11/09/2012
• Status: Active Grant

• Current Assignee: Shenzhen Royole Technologies Co. Ltd
• Original Assignee: Shenzhen Royole Technologies Co. Ltd
• Inventors: Liu, Zihong, Yu, Xiaojun
• Primary Examiner(s): Lee, Nicholas
• Application Number:
  US14/697,277
• Publication Number:
  US 20150295016A1
• Time in Patent Office: 715 Days
• Field of Search: None
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2360/04 Display device controller operating with a plurality of display units
• CPC Class Codes: G09G 3/001 using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background slide projectors per se G03B23/00 = 42 HP
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 3/344 based on particles moving in a fluid or in a gas, e.g. electrophoretic devices electrophoretic devices per se G02F1/167
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• CPC Class Codes: H10K 59/128 comprising two independent displays, e.g. for emitting information from two major sides of the display
• CPC Class Codes: H10K 59/179 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/50 OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Abstract

A double-sided display and a method for controlling the same are provided. The double-sided display includes a plurality of pixel units and a plurality of circuits. The pixel units are disposed on each of a front side and a back side of the double-sided display, and the pixel units on the front side are opposite to the pixel units on the back side in a one-to-one manner. A pixel unit on the front side and a pixel unit on the back side opposite to the pixel unit on the front side are controlled by an identical circuit. Each of the circuits includes a switching transistor. The switching transistor includes a first input terminal connected to a scan line, a second input terminal connected to a data line, and an output terminal connected to the opposite pixel units on the front side and the back side.

Claims

1. A double-sided display, comprising:

a plurality of pixel units on each of a front side and a back side of the double-sided display, the pixel units on the front side being opposite to the pixel units on the back side in a one-to-one manner;

a plurality of circuits, wherein a pixel unit on the front side and a pixel unit on the back side opposite to the pixel unit on the front side are controlled by an identical circuit, and each of the circuits comprises a first switching transistor, a first input terminal of the first switching transistor connected to a scan line, a second input terminal of the first switching transistor connected to a data line, and an output terminal of the first switching transistor connected to the opposite pixel units on the front side and the back side; and

a thin film transistor backplate having a plurality of through holes penetrating through the thin film transistor backplate, wherein the circuits are disposed on a same side of the thin film transistor backplate, and output terminals of first switching transistors of the circuits are respectively connected to the pixel units on the back side via the through holes.

2. The double-sided display of claim 1, wherein each of the circuit further comprises a second switch transistor;

the second switching transistor for switching on the pixel unit on the front side is connected between the output terminal of the first switching transistor and the pixel unit on the front side;

the second switching transistor comprises an input terminal electrically connected to the output terminal of the first switching transistor, an output terminal electrically connected to the pixel unit on the front side, and a control terminal connected to a control line.

3. The double-sided display of claim 2, wherein the first switching transistor comprises a gate electrode acting as the first input terminal, a source electrode acting as the second input terminal, and a drain electrode acting as the output terminal;

the second switching transistor comprises a gate electrode acting as the control terminal, a source electrode acting as the input terminal, and a drain electrode acting as the output terminal.

7. The double-sided display of claim 1, wherein the through holes are respectively filled with electrical connections that are electrically connected between the outputs terminal of the first switching transistors and the pixel units on the back side.

8. The double-sided display of claim 1, wherein the through holes are respectively filled with electrical connections that are electrically connected between the output terminal of the third switching transistors and the pixel units on the back side.

9. The double-sided display of claim 1, wherein the pixel units on the front side are an active light-emitting display units or passive light-emitting display units, the pixel units on the back side are an active light-emitting display units or passive light-emitting display units, and each of the pixel units on the front side and back side comprises a storage capacitor.

10. The double-sided display of claim 9, wherein the pixel units on the front side are active light-emitting display units, each pixel unit on the front side comprises an organic light-emitting diode OLED acting as an active light-emitting display device and a first driving transistor;

the first driving transistor comprises a control terminal electrically connected to the output terminal of the first switching transistor, an input terminal electrically connected to a cathode of the organic light-emitting diode OLED, and an output terminal grounded; and

wherein the storage capacitor is connected between the control terminal and the output terminal of the first driving transistor, and an anode of the OLED is connected to a power supply line.

11. The double-sided display of claim 9, wherein the pixel units on the back side are active light-emitting display units, each pixel unit on the back side comprises an organic light-emitting diode OLED acting as an active light-emitting display device and a second driving transistor;

the second driving transistor comprises a control terminal electrically connected to the output terminal of the first switching transistor, an input terminal electrically connected to a cathode of the organic light-emitting diode OLED, and an output terminal grounded; and

wherein the storage capacitor is connected between the control terminal and the output terminal of the second driving transistor, and an anode of the OLED is connected to a power supply line.

12. The double-sided display of claim 10, wherein the second driving transistors and the storage capacitor of the pixel units on the back side are disposed on the front side instead of the back side, and the second driving transistors are respectively connected to the cathodes of the organic light-emitting diode OLEDs via the through holes.

13. The double-sided display of claim 9, wherein each of the passive light-emitting display units comprises electronic ink E-INK acting as a passive light-emitting display device, and the electronic ink E-INK is disposed between two counter electrodes of the storage capacitor;

wherein one of the two counter electrodes of the storage capacitor is electrically connected to the output terminal of the first switching transistor, and the other is grounded.

4. A double-sided display, comprising:

a plurality of pixel units on each of a front side and a back side of the double-sided display, the pixel units on the front side being opposite to the pixel units on the back side in a one-to-one manner; and

a plurality of circuits, wherein a pixel unit on the front side and a pixel unit on the back side opposite to the pixel unit on the front side are controlled by an identical circuit, and each of the circuits comprises a first switching transistor, a first input terminal of the first switching transistor connected to a scan line, a second input terminal of the first switching transistor connected to a data line, and an output terminal of the first switching transistor connected to the opposite pixel units on the front side and the back side,

wherein each of the circuit further comprises a third switch transistor;

the third switching transistor for switching on the pixel unit on the back side is connected between the output terminal of the first switching transistor and the pixel unit on the back side;

the third switching transistor comprises an input terminal electrically connected to the output terminal of the first switching transistor, an output terminal electrically connected to the pixel unit on the back side, and a control terminal connected to a control line.

5. The double-sided display of claim 4, wherein each of the circuit further comprises a second switching transistor;

the second switching transistor for switching on the pixel unit on the front side is connected between the output terminal of the first switching transistor and the pixel unit on the front side;

the second switching transistor comprises an input terminal electrically connected to the output terminal of the first switching transistor, an output terminal electrically connected to the pixel unit on the front side, and a control terminal connected to the same control line with the control terminal of the third switching transistor.

6. The double-sided display of claim 5, wherein each of the circuit further comprises an inverter;

an input of the inverter is connected the control line, and an output of the inverter is connected to one of the control terminal of second switching transistor and the control terminal of third switching transistor.

15. A method for controlling the double-sided display of claim 5, comprising the following steps:

inputting, through the control line, a control signal for simultaneously switching on the second switching transistor and the third switching transistor, and

simultaneously controlling, by a data signal, the opposite pixel units on the front side and the back side that are respectively electrically connected to the second switching transistor and the third switching transistor to display;

wherein the data signal, after being input from the data line, is transmitted to the pixel unit on the front side and the opposite pixel unit on the back side respectively via the first switching transistor activated by a scan signal input from a scan line.

16. A method for controlling the double-sided display of claim 6, comprising the following steps:

inputting, through the control line, a control signal for switching on the second switching transistor and switching off the third switching transistor, and controlling, by a data signal, the pixel unit on the front side that is electrically connected to the output terminal of the second switching transistor to display, wherein the data signal, after being input from a data line, is transmitted to the pixel unit on the front side via the first switching transistor activated by a scan signal input from a scan line and the second switching transistor T2 in sequence so that only the front side of the double-sided display displays;

or, inputting, through the control line, a control signal for switching off the second switching transistor and switching on the third switching transistor, and controlling, by a data signal, the pixel unit on the back side that is electrically connected to the output terminal of the third switching transistor to display, wherein the data signal, after being input from the data line, is transmitted to the pixel unit on the back side via the first switching transistor activated by a scan signal input from a scan line and the third switching transistor in sequence so that only the back side of the double-sided display displays.

17. A method for controlling the double-sided display of claim 6, comprising the following steps:

inputting, through the control line, a first control signal for switching on the second switching transistor and switching off the third switching transistor, and controlling, by a data signal, the pixel unit on the front side that is electrically connected to the output terminal of the second switching transistor to display, and meanwhile charging the storage capacitor of the pixel unit on the front side by the first data signal until a voltage of the storage capacitor of the pixel unit on the front side reaches a voltage required for maintaining the display of the pixel unit on the front side; and

inputting, through the control line, a second control signal for switching off the second switching transistor and switching on the third switching transistor, and controlling, by a second data signal, the pixel unit on the back side that is electrically connected to the output terminal of the third switching transistor to display, and meanwhile charging the storage capacitor of the pixel unit on the back side by the second scan signal until a voltage of the storage capacitor of the pixel unit on the back side reaches a voltage required for maintaining the display of the pixel unit on the back side;

wherein the first data signal, after being input from the data line, is transmitted to the pixel unit on the front side via the first switching transistor activated by a scan signal input from a scan line and the second switching transistor in sequence; and

the second data signal, after being input from the data line, is transmitted to the pixel unit on the back side via the first switching transistor activated by a scan signal input from a scan line and the third switching transistor in sequence.

18. The method of claim 17, wherein the first data signal and the second data signal are different image signals and are alternately transmitted to the opposite pixel units on the front side in a time division manner so that the front side and the back side of the double-sided display simultaneously display different images.

14. A double-sided display, comprising:

a substrate comprising a first side, a second side opposite to the first side, and a plurality of through holes penetrating through the substrate;

a plurality of first pixel units, each first pixel unit comprising a first light-emitting display device disposed on one of the first and second sides; and

a plurality of second pixel units, each second pixel unit comprising a second light-emitting display device on the other one of the first and second sides, wherein the second light-emitting display devices are opposite to the first light-emitting display devices in a one-to-one manner; and

a plurality of circuits disposed on one of the first and second sides, wherein a first light-emitting display device and a second light-emitting display device opposite to the first light-emitting display device are controlled by an identical circuit, and each of the circuits comprises a first switching transistor, a first input terminal of the first switching transistor connected to a scan line, a second input terminal of the first switching transistor connected to a data line, and an output terminal of the first switching transistor connected to one of the opposite first and second the light-emitting display devices and connected to the other one of the opposite first and second the light-emitting display devices via a corresponding through hole.