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US 9,176,559 B2Granted
Display device using infrared sensor module and method of driving the same
AssigneeLG Display Co., Ltd.
InventorsJun-Seok Oh, Shi-Cheol Song
Life of this patent
Estimating the term…
Abstract
A display device using infrared sensor modules that is capable of reducing power consumption and extending durability of infrared light sources and sensors and a method of driving the same are disclosed. The display device includes a display panel to display images, a plurality of infrared sensor modules to optically detect a touched position on the display panel, an infrared sensor module controller to sequentially drive the infrared sensor modules and to switch the infrared sensor modules to a low-power mode when a touch operation has not been performed within a predetermined period of time or when the display panel is in a power-saving mode, and a system to provide a state of the display panel to the infrared sensor module controller.
Claims7
A display device, comprising:
- a display panel configured to display images;
- a plurality of infrared sensor modules configured to optically detect a touched position on the display panel;
- a retro-reflection plate disposed at each side of the display panel;
- and
- an infrared sensor module controller configured to:
- receive an operation mode of the display panel from a system;
- switch the infrared sensor modules to a low-power mode when a touch operation has not been performed within a predetermined period of time;
- and
- switch the infrared sensor modules to the low-power mode when the display panel is in a power-saving mode,
- wherein the infrared sensor modules comprise:
- a first infrared sensor module located at the upper corner of one side of the display panel,
- a second infrared sensor module located at the upper corner of the other side of the display panel, and
- a third infrared sensor module located at the lower corner of the one side of the display panel,
- wherein each of the first to third infrared sensor modules comprises:
- a plurality of infrared light sources configured to emit infrared light, and
- a plurality of sensors configured to sense the infrared light that is reflected by the retro-reflection plate,
- wherein the infrared sensor module controller is further configured to sequentially turn on/off the first to third infrared sensor modules when the touch operation has been performed within a predetermined period of time or, based on whether images are displayed on the display panel, and
- wherein the infrared sensor module controller comprises:
- a comparison and determination unit configured to determine the low-power mode or a normal mode, based on whether the touch operation has been performed within the predetermined period of time or whether the display panel is operated in a power-saving mode;
- a frame rate adjustment unit configured to adjust a frame rate when the low-power mode is determined to reduce light emission power of the infrared light sources and sensing speed of the sensors;
- a microcontroller unit (MCU) comprising a clock speed adjustment unit configured to reduce a clock speed of an internal clock of the MCU in the low-power mode,
- a direct memory access to which information is moved without execution of a program in the MCU,
- a memory, as a storage device, configured to store programmed command codes,
- a program debugger configured to find programming errors and reveal a cause thereof, and
- a communication port configured to:
- receive an operating system (OS) power-saving mode signal from the system, or
- transmit or receive a signal to or from the system.
24 more elements
A method of driving a display device having a display panel, a plurality of infrared sensor modules to optically detect a touched position on the display panel, and an infrared sensor module controller to control the infrared sensor modules, the method comprising:
- receiving an operation mode of the display panel from a system;
- determining:
- whether or not a touch operation has been performed within a predetermined period of time through a timer;
- and
- whether the display panel is in a power-saving mode or a normal mode;
- and
- switching the infrared sensor modules and the infrared sensor module controller:
- to a low-power mode through a mode switching unit when the touch operation has not been performed within the predetermined period of time to reduce light emission power of the infrared light sources and sensing speed of the sensors, and to the low power mode through the mode switching unit when the display panel is in the power-saving mode, or
- to a normal mode through the mode switching unit when the touch operation has been performed within the predetermined period of time or when images are displayed on the display panel,
- wherein the infrared sensor modules comprise:
- a first infrared sensor module located at the upper corner of one side of the display panel,
- a second infrared sensor module located at the upper corner of the other side of the display panel, and
- a third infrared sensor module located at the lower corner of the one side of the display panel,
- wherein each of the first to the third infrared sensor modules comprises:
- a plurality of infrared light sources to emit infrared light, and
- a plurality of sensors to sense the infrared light that is reflected by a retro-reflection plate disposed at each side of the display panel,
- wherein the infrared sensor module controller sequentially turns on/off the first to third infrared sensor modules when the touch operation has been performed within a predetermined period of time or when images are displayed on the display panel, and
- wherein the infrared sensor module controller comprises:
- a comparison and determination unit configured to determine the low-power mode or a normal mode based on whether the touch operation has been performed within the predetermined period of time or whether the display panel is operated in a power-saving mode;
- a frame rate adjustment unit configured to adjust a frame rate when the low-power mode is determined to reduce light emission power of the infrared light sources and sensing speed of the sensors;
- a microcontroller unit (MCU) comprising a clock speed adjustment unit configured to reduce a clock speed of an internal clock of the MCU in the low-power mode,
- a direct memory access to which information is moved without execution of a program in the MCU,
- a memory, as a storage device, to store programmed command codes,
- a program debugger to find programming errors and reveal a cause thereof, and
- a communication port to:
- receive an operating system (OS) power-saving mode signal from the system, or
- transmit or receive a signal to or from the system.
24 more elements
Dependencies are inferred from the claim text.