CN-122003710-A - LED driver and display device including the same

Abstract

An LED driver according to an embodiment of the present disclosure may include a plurality of channel terminals connected to a plurality of LEDs and each including a channel current source, a scan switch connected to the plurality of LEDs and configured for a scan operation, a plurality of scan terminals including a first charge sharing switch for moving charge of any one of a plurality of first capacitors forming a capacitance between the plurality of LEDs and the scan switch to another first capacitor, and a switch controller for controlling the first charge sharing switch.

Inventors

• Shen Yunxiu
• JIN CHANGZHU
• JIN ZHIHUAN
• LI ZHONGMIN
• Cui Zhengao

Assignees

• LX半导体科技有限公司

Dates

Publication Date

20260508

Application Date

20240926

Priority Date

20230926

Claims (20)

1. 1. An LED driver, the LED driver comprising: a plurality of channel stages connected to the plurality of LEDs and including a channel current source; A plurality of scan stages connected to the plurality of LEDs and including a scan switch for a scan operation and a first charge sharing switch for transferring charge of one of a plurality of first capacitors forming a capacitance between the plurality of LEDs and the scan switch to another first capacitor, and A switch controller configured to control the first charge sharing switch.
2. 2. The LED driver of claim 1, further comprising a voltage generator configured to provide a precharge voltage to the plurality of first capacitors, Each of the plurality of scan stages further includes a precharge switch for precharging one of the plurality of first capacitors, and The switch controller is configured to control the first charge sharing switch based on an operation of at least one of the scan switch and the precharge switch.
3. 3. The LED driver of claim 2, wherein, One end of one of the first charge sharing switches is connected between one of the precharge switches and one of the first capacitors, and The other end of the one of the first charge sharing switches is connected to the other first charge sharing switch.
4. 4. The LED driver of claim 2, wherein, The switch controller is configured to turn on at least one of the first charge sharing switches at a point in time when one of the scan switches is turned off.
5. 5. The LED driver of claim 4, wherein, The switch controller is configured to turn on a first charge sharing switch connected to an off scan switch among the first charge sharing switches.
6. 6. The LED driver of claim 4, wherein, The switch controller is configured to turn on at least one of the first charge sharing switches from a point in time at which at least one of the scan switches is turned off to a point in time at which at least one of the precharge switches is turned on.
7. 7. The LED driver of claim 6, wherein, The switch controller is configured to turn on a first charge sharing switch connected to the turned-off scan switch and a first charge sharing switch connected to the turned-on precharge switch at a point of time when at least one of the scan switches is turned off.
8. 8. The LED driver of claim 7, wherein, The switch controller is configured to turn off a first charge sharing switch connected to the turned-off scan switch and a first charge sharing switch connected to the turned-on precharge switch at a point of time when one of the precharge switches is turned on.
9. 9. The LED driver of claim 1, wherein, Each of the plurality of channel stages further includes a second charge sharing switch for transferring charge of a second capacitor forming a capacitance between each of the plurality of LEDs and each of the channel current sources to one of the plurality of first capacitors, and The switch controller is further configured to control the second charge sharing switch.
10. 10. The LED driver of claim 9, wherein, The switch controller is configured to turn on all of the second charge sharing switches at a point in time when at least one of the first charge sharing switches is turned on.
11. 11. The LED driver of claim 10, wherein, The switch controller is configured to turn off all of the second charge sharing switches at a point in time when at least one of the first charge sharing switches is turned off.
12. 12. The LED driver of claim 11, wherein, One end of each of the second charge sharing switches is connected to each of the second capacitors, and The other end of each of the second charge sharing switches is connected to each of the first charge sharing switches.
13. 13. The LED driver of claim 1, wherein, The plurality of scan stages includes: A first scan stage including a first scan switch and a 1-1 charge sharing switch, and A second scan stage including a second scan switch and a 1-2 charge-sharing switch, and configured to perform a scan operation after a scan operation of the first scan stage is performed, The plurality of first capacitors includes: A 1-1 capacitor connected to the 1-1 charge sharing switch and a 1-2 capacitor connected to the 1-2 charge sharing switch, and The switch controller is configured to turn on the 1-1 charge sharing switch and the 1-2 charge sharing switch at a point in time when the first scan switch is turned off.
14. 14. The LED driver of claim 13, further comprising a voltage generator configured to provide a precharge voltage to the plurality of first capacitors, The first scan stage further includes a first precharge switch for precharging the 1-1 capacitor, and the second scan stage further includes a second precharge switch for precharging the 1-2 capacitor, and The switch controller is configured to turn off the 1-1 charge sharing switch and the 1-2 charge sharing switch at a point in time when the first precharge switch is turned on.
15. 15. The LED driver of claim 14, wherein, Each of the plurality of channel stages further includes a second charge sharing switch for transferring charge of each of a plurality of second capacitors forming a capacitance between each of the plurality of LEDs and each of the channel current sources to one of the plurality of first capacitors, and The switch controller is configured to turn on all of the second charge sharing switches at a point in time when the 1-1 charge sharing switch and the 1-2 charge sharing switch are turned on, and to turn off all of the second charge sharing switches at a point in time when the 1-l charge sharing switch and the 1-2 charge sharing switch are turned off.
16. 16. A display device, the display device comprising: a display panel including a plurality of LEDs; an LED driver, the LED driver comprising: A plurality of channel stages connected to the plurality of LEDs and including a channel current source; A plurality of scan stages connected to the plurality of LEDs and including a scan switch for a scan operation and a first charge sharing switch for transferring charge of one of a plurality of first capacitors forming a capacitance between the plurality of LEDs and the scan switch to another first capacitor, and A switch controller configured to control the first charge sharing switch.
17. 17. The display device of claim 16, wherein, The LED driver further comprises a voltage generator configured to provide a precharge voltage to the first capacitor, Each of the plurality of scan stages further includes a precharge switch for precharging one of the plurality of first capacitors, and The switch controller is configured to control the first charge sharing switch based on an operation of at least one of the scan switch and the precharge switch.
18. 18. The display device of claim 17, wherein, The switch controller is configured to turn on a first charge sharing switch connected to the turned-off scan switch and a first charge sharing switch connected to the turned-on precharge switch at a point of time when at least one of the scan switches is turned off, and The turned-on first charge sharing switch is turned off at a point of time when one of the precharge switches is turned on.
19. 19. The display device of claim 18, wherein, Each of the plurality of channel stages further includes a second charge sharing switch for transferring charge of a second capacitor forming a capacitance between each of the plurality of LEDs and each of the channel current sources to one of the plurality of first capacitors, and The switch controller is further configured to control the second charge sharing switch.
20. 20. The display device of claim 19, wherein, The switch controller is configured to turn on all of the second charge sharing switches while at least some of the first charge sharing switches are turned on.

Description

LED driver and display device including the same Technical Field The present disclosure relates to an LED driver and a display device including the same. More particularly, the present disclosure relates to an LED driver that minimizes power consumption and a display device including the same. Background The display panel may be implemented in various ways. For example, the display panel may be classified as an LCD display panel or an LED display panel. The LED display panel may utilize mini LEDs or micro LED elements. Thus, a desired number of modular LED elements may be arranged. Accordingly, a large display device such as a sign can be easily realized. However, since the display device includes a large number of LED modules, the number of LED drivers required may also be large. Therefore, a method of reducing power consumption of each LED driver is important. Furthermore, as power consumption regulations of each country become stricter, a demand for a method of reducing power consumption of a display device is growing. Disclosure of Invention Technical problem The present disclosure seeks to minimize power consumption between scanning operations of a scanning unit. The present disclosure seeks to minimize power consumption between scanning operations of a scanning unit by utilizing the charge of a capacitor. Technical proposal An LED driver according to an embodiment of the present disclosure may include a plurality of channel stages connected to a plurality of LEDs and including a channel current source, a plurality of scan stages connected to the plurality of LEDs, each of the plurality of scan stages including a scan switch for a scan operation and a first charge sharing switch for transferring charge of one of a plurality of first capacitors forming a capacitance between the plurality of LEDs and the scan switch to another one of the plurality of first capacitors, and a switch controller configured to control the first charge sharing switch. An LED driver according to an embodiment of the present disclosure may further include a voltage generator for providing a precharge voltage to the plurality of first capacitors, each of the plurality of scan stages further includes a precharge switch for precharging one of the plurality of first capacitors, and the switch controller may be configured to control the first charge sharing switch based on an operation of at least one of the scan switch and the precharge switch. According to an embodiment of the present disclosure, an LED driver may be configured such that one end of any one of the first charge sharing switches is connected between one end of any one of the precharge switches and one end of any one of the first capacitors, and the other end of any one of the first charge sharing switches may be connected to another one of the first charge sharing switches. According to embodiments of the present disclosure, an LED driver may be configured to turn on at least one of the first charge sharing switches when any one of the scan switches is turned off. According to embodiments of the present disclosure, an LED driver may be configured to turn on a first charge sharing switch connected with an off scan switch among the first charge sharing switches. According to embodiments of the present disclosure, an LED driver may be configured to turn on at least one of the first charge sharing switches from a point in time when at least one of the scan switches is turned off to a point in time when at least one of the precharge switches is turned on. An LED driver according to embodiments of the present disclosure may be configured to turn on a first charge sharing switch connected to an off scan switch and a first charge sharing switch connected to an on precharge switch among the first charge sharing switches when at least one of the scan switches is turned off. An LED driver according to embodiments of the present disclosure may be configured to turn off a first charge sharing switch connected to an off scan switch and a first charge sharing switch connected to an on precharge switch when any one of the precharge switches is turned on. Each of the plurality of channel stages of the LED driver according to the embodiment of the present disclosure further includes a second charge sharing switch for transferring charge of a second capacitor forming a capacitance between each of the plurality of LEDs and each of the channel current sources to any of the plurality of first capacitors, and the switch controller may further control the second charge sharing switch. An LED driver according to embodiments of the present disclosure may be configured to turn on all of the second charge sharing switches when at least one of the first charge sharing switches is turned on. An LED driver according to embodiments of the present disclosure may be configured to turn off all of the second charge sharing switches when at least one of the first charge sharing switches is turned off. An