Organic light emitting display device and method of controlling same

• US 10,388,225 B2
• Filed: 09/25/2017
• Issued: 08/20/2019
• Est. Priority Date: 09/30/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Pyeon, MyungJin, Chon, HyunSon
• Primary Examiner(s): Jansen, II, Michael J
• Application Number:
  US15/714,635
• Publication Number:
  US 20180096655A1
• Time in Patent Office: 694 Days
• CPC Class Codes: G09G 2320/0295 by monitoring each display pixel
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/2074 using sub-pixels
• 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

Abstract

Discussed is an organic light emitting display device including a display panel; a human body detection unit to detect a human body existing in front of the display panel; a human body determination unit to determine whether the human body exists and a location of the human body with respect to the display panel based on detection information from the human body detection unit; a brightness control unit to determine whether to control a brightness of the display panel based on a result of the determination by the human determination unit; and a timing controller to control image data provided to the display panel based on the determination from the brightness control unit. Accordingly, a viewer can view a sufficiently bright image, and energy can be saved and threshold voltage (Vth) difference can be compensated for.

Claims

1. An organic light emitting display device comprising:

a display panel;

a human body detection device detector configured to detect a human body existing in front of the display panel; and

a timing controller including a human body determination unit and a brightness control unit,

wherein the human body determination unit determines whether the human body exists in front of the display panel and a location of the human body with respect to the display panel based on detection information from the human body detection detector,

wherein the brightness control device unit determines whether to control a brightness of the display panel based on a result of the determination by the human body determination unit,

wherein the timing controller is configured to control image data provided to the display panel based on the determination from the brightness control device unit,

wherein, when the human body determination device unit circuit determines that the human body does not exist in front of the display panel, the brightness control unit enters a power saving mode in which the brightness of the display panel is reduced to a predetermined level, and

wherein, when the brightness control unit receives information indicating that the human body does not exist in front of the display panel from the human body determination unit for a predetermined time after the entrance into the power saving mode, the brightness control unit enters a voltage sensing mode in which the brightness of the display panel is reduced to the predetermined level or lower.

2. The organic light emitting display device of claim 1, wherein, when the human body determination unit determines that the human body exists outside a predetermined angle range from a central region of the display panel, the brightness control unit circuit increases the brightness of the display panel.

3. The organic light emitting display device of claim 1, wherein the display panel includes a plurality of sub-pixels, and each sub-pixel comprises:

an organic light emitting diode;

a driving transistor configured to drive the organic light emitting diode and having a first node electrically connected to the organic light emitting diode, a second node to which a data voltage is applied, and a third node to which a driving voltage is applied from a driving voltage line;

a switching transistor electrically connected between the second node of the driving transistor and a data line;

a sensing transistor electrically connected between the first node of the driving transistor and a reference voltage line to which a reference voltage is applied;

an analog digital converter configured to measure a voltage of the reference voltage line;

a sampling switch electrically connected between the reference voltage line and the analog digital converter; and

when the human body is not detected for a preset time based on a result of the detection by the human body detector, a voltage compensation unit initializes the reference voltage line by applying the reference voltage to the reference voltage line, and when a predetermined time passes after the initialization of the reference voltage line, electrically connect the analog digital converter to the reference voltage line by turning on the sampling switch so that the analog digital converter measures the voltage of the reference voltage line.

4. The organic light emitting display device of claim 3, wherein the brightness control unit enters the voltage sensing mode in which the brightness is reduced to the predetermined level or lower based on the voltage compensation device circuit operating the sampling switch to measure the voltage of the reference voltage line.

5. The organic light emitting display device of claim 4, wherein, when the brightness control unit receives information indicating that the human body does not exist in front of the display panel from the human body determination device unit while the voltage sensing mode is performed and completed, the brightness control device enters an AGP mode by controlling the brightness such that an internal pattern is displayed on the display panel.

6. The organic light emitting display device of claim 1, wherein the brightness control unit is configured to delay the brightness control unit from entering into the voltage sensing mode after the power saving mode by placing a buffer mode between the power saving mode and the voltage sensing mode.

7. A method of controlling an organic light emitting display device having a display panel, a human body detector, and a timing controller including a human body determination unit and a brightness control unit, the method comprising:

detecting, via the human body detector, a human body existing in front of the display panel;

determining, via the human body determination unit, whether the human body exists in front of the display panel and a location of the human body with respect to the display panel based on detection information from the detecting of the human body;

determining, via the brightness control unit, whether to control a brightness of the display panel based on a result of the determination from the determining of whether the human body exists; and

controlling, via the timing controller, a data voltage provided to the display panel based on the determination from the determining of whether to control the brightness,

wherein, when it is determined that the human body does not exist in front of the display panel, the determining of whether to control the brightness comprises entering a power saving mode in which the brightness of the display panel is reduced to a predetermined level, and

wherein when the human body is not detected for a preset time after the entrance into the power saving mode, entering a voltage sensing mode in which a threshold voltage of a driving transistor of each sub-pixel of the display panel is measured.

8. The method of claim 7, wherein, when the human body exists outside a predetermined angle range from a central region of the display panel, the determining of whether to control the brightness comprises increasing the brightness of the display panel.

9. The method of claim 7, further comprising:

when the entering of the voltage sensing mode is performed, reducing the brightness to the predetermined level or lower.

10. The method of claim 9, further comprising:

when information indicating that the human body does not exist in front of the display panel is provided while the voltage sensing mode is performed and completed, entering an Auto Generation Pattern (AGP) mode by controlling the brightness such that an internal pattern is displayed on the display panel.

11. The method of claim 7, wherein the entering into the voltage sensing mode after the power saving mode is delayed by the brightness control unit placing a buffer mode between the power saving mode and the voltage sensing mode.

12. An organic light emitting display device comprising:

a display panel;

a human body detector to detect presence of a human body in front of the display panel; and

a timing controller including a human body determination unit and a brightness control unit,

wherein the human body determination unit determines whether the human body is present in front of the display panel and a location of the human body with respect to the display,

wherein the brightness control unit controls a brightness of the display panel based on the presence and the location of the human body with respect to the display panel,

wherein the timing controller controls image data provided to the display panel based on information from brightness controller control unit,

wherein the brightness of the display panel is controlled based on the presence of the human body outside a predetermined angle range from a central region of the display panel,

wherein, when the human body is not present in front of the display panel, the brightness control unit enters a power saving mode and reduces the brightness of the display panel to a predetermined level, and

wherein, when the brightness control unit receives information indicating that the human body is not present in front of the display panel from the human body determination unit for a predetermined time after the entrance into the power saving mode, the brightness control unit enters a voltage sensing mode in which the brightness of the display panel is reduced to the predetermined level or lower.

13. The organic light emitting display device of claim 12, wherein the brightness is increased when the human body is detected outside the predetermined angle range from the central region of the display panel.

14. The organic light emitting display device of claim 12, wherein the display panel includes a plurality of sub-pixels, and each sub-pixel comprises:

an organic light emitting diode;

a driving transistor to drive the organic light emitting diode and having a first node electrically connected to the organic light emitting diode, a second node to which a data voltage is applied, and a third node to which a driving voltage is applied from a driving voltage line;

a switching transistor electrically connected between the second node of the driving transistor and a data line;

a sensing transistor electrically connected between the first node of the driving transistor and a reference voltage line to which a reference voltage is applied;

an analog digital converter to measure a voltage of the reference voltage line;

a sampling switch electrically connected between the reference voltage line and the analog digital converter; and

when the human body is not detected for a preset time based on a result of the detection by the human body detector, a voltage compensation unit initializes the reference voltage line by applying the reference voltage to the reference voltage line, and when a predetermined time passes after the initialization of the reference voltage line, electrically connect the analog digital converter to the reference voltage line by turning on the sampling switch so that the analog digital converter measures the voltage of the reference voltage line.

15. The organic light emitting display device of claim 14, wherein the brightness control unit enters the voltage sensing mode in which the brightness is reduced to the predetermined level or lower based on the voltage compensation unit operating the sampling switch to measure the voltage of the reference voltage line.

16. The organic light emitting display device of claim 15, wherein, when the brightness unit receives information indicating that the human body is not present in front of the display panel from the human body determination unit while the voltage sensing mode is performed and completed, the brightness unit enters an AGP mode by controlling the brightness such that an internal pattern is displayed on the display panel.

17. The organic light emitting display device of claim 12, wherein the brightness control unit is configured to delay the brightness control device circuit from entering into the voltage sensing mode after the power saving mode by placing a buffer mode between the power saving mode and the voltage sensing mode.