Search

EP-4742229-A1 - DISPLAY DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME

EP4742229A1EP 4742229 A1EP4742229 A1EP 4742229A1EP-4742229-A1

Abstract

A display device includes a display panel including a pixel, a gate driver configured to output a gate signal to the pixel, a data driver configured to apply a data voltage to the display panel, a voltage outputter configured to apply a gate high voltage and a gate low voltage to the gate driver and a driving controller configured to control the gate driver, the data driver and the voltage outputter. The gate signal is generated based on the gate high voltage and the gate low voltage. The driving controller controls a driving frequency of the display panel. The gate low voltage is generated based on a predetermined power voltage. A generation cycle of the predetermined power voltage is controlled based on the driving frequency.

Inventors

  • KIM, HYUNSU
  • BAE, YOUNGMIN
  • Bae, Yunki

Assignees

  • Samsung Display Co., Ltd.

Dates

Publication Date
20260513
Application Date
20250805

Claims (15)

  1. A display device (1A, 1060) comprising: a display panel (100) including a pixel; a gate driver (300, 300A) configured to output a gate signal to the pixel; a data driver (500) configured to apply a data voltage to the display panel (100); a voltage outputter (700, 700A, 700B) configured to apply a gate high voltage having a first voltage level and a gate low voltage having a second voltage level lower than the first voltage level to the gate driver (300, 300A); and a driving controller (200) configured to control the gate driver (300, 300A), the data driver (500) and the voltage outputter (700, 700A, 700B), wherein the gate driver (300, 300A) is configured to generate the gate signal based on the gate high voltage and the gate low voltage, wherein the driving controller (200) is configured to control a driving frequency of the display panel (100), wherein the voltage outputter (700, 700A, 700B) is configured to generate the gate low voltage based on a predetermined power voltage having a predetermined power voltage level, and wherein the voltage outputter (700, 700A, 700B) is configured to control a generation cycle of the predetermined power voltage based on the driving frequency.
  2. The display device (1A, 1060) of claim 1, wherein the display device is configured such that when the driving frequency is higher than a reference driving frequency, the generation cycle is decreased.
  3. The display device of claim 1, wherein when the driving frequency is lower than a reference driving frequency, the generation cycle is increased.
  4. The display device (1A, 1060) of any of the preceding claims, wherein the voltage outputter (700, 700A, 700B) includes: a voltage generating block (710, 710A, 710B) configured to receive an input power voltage and a cycle control signal, and output the predetermined power voltage based on the input power voltage and the cycle control signal; and a voltage converting block (720) configured to output the gate low voltage based on the predetermined power voltage.
  5. The display device (1A, 1060) of claim 4, wherein the input power voltage includes a first input power voltage and a second input power voltage, wherein the voltage generating block (710, 710A, 710B) includes: a first switching element including a first terminal which receives the first input power voltage and a second terminal connected to a first node; a second switching element including a first terminal which receives a ground voltage and a second electrode connected to a second node; a third switching element including a first terminal which receives the ground voltage and a second terminal connected to the first node; a first capacitor including a first electrode connected to the first node and a second electrode connected to the second node; a fourth switching element including a first terminal connected to the second node and a second terminal connected to a third node; a fifth switching element including a first terminal which receives the second input power voltage and a second terminal connected to the third node; a sixth switching element including a first terminal which receives the ground voltage and a second terminal connected to a fourth node; a second capacitor including a first electrode connected to the third node and a second electrode connected to the fourth node; a seventh switching element including a first terminal connected to the fourth node and a second terminal connected to a fifth node; a third capacitor including a first electrode connected to the fifth node and a second electrode which receives the ground voltage, and wherein the fifth node outputs the predetermined power voltage.
  6. The display device (1A, 1060) of claim 4 or 5, wherein a generation period in which the voltage generating block (710, 710A, 710B) operates includes a first generation period and a second generation period, wherein in the first generation period, the first capacitor is configured to store the first input power voltage, and the second capacitor is configured to store the second input power voltage, wherein in the second generation period, the display device is configured that the second node and the third node are connected, and the fourth node and the fifth node are connected, and wherein an absolute value of the predetermined power voltage is a sum of the first input power voltage and the second input power voltage.
  7. The display device (1A, 1060) of claim 5 or 6, wherein the first input power voltage and the second input power voltage are positive voltages, and the predetermined power voltage is a negative voltage.
  8. The display device of any of claims 5 to 7, wherein the generation cycle is a length of the generation period, and wherein the length of the generation period is changed based on the driving frequency.
  9. The display device (1A, 1060) of claim 8, wherein the display device is configured that when the driving frequency is increased, the length of the generation period is decreased, and/or wherein when the driving frequency is decreased, the length of the generation period is increased.
  10. The display device (1A, 1060) of any of the preceding claims, wherein the driving frequency includes a first driving frequency and a second driving frequency higher than the first driving frequency, wherein a frame period of the first driving frequency includes an active period in which the data voltage is applied and a blank period in which the applying of the data voltage is stopped, wherein a frame period of the second driving frequency includes the active period, and wherein the generation cycle has a first generation cycle in the active period, and the generation cycle has a second generation cycle longer than the first generation cycle in the blank period.
  11. The display device (1A, 1060) of claim 10, wherein in the active period, an active signal has an activation level, and in the blank period, the active period has an inactivation level, wherein when the active signal has the activation level, the generation cycle has the first generation cycle, and wherein when the active signal has the inactivation level, the generation cycle has the second generation cycle.
  12. The display device (1A, 1060) of claim 10 or 11, wherein in the active period, an active signal has an activation level, and in the blank period, the active period has an inactivation level, wherein the frame period of the first driving frequency includes a first period to a fourth period, wherein in the first period, the active signal has the activation level, and the generation cycle has the second generation cycle, wherein in the second period following the first period, the active signal has the activation level, and the generation cycle has the first generation cycle, wherein in the third period following the second period, the active signal has the inactivation level, and the generation cycle has the first generation cycle, and wherein in the fourth period following the third period, the active signal has the activation level, and the generation cycle has the second generation cycle.
  13. The display device of any of the preceding claims, wherein the gate signal is generated based on the gate high voltage and the gate low voltage, wherein a frame period in which the pixel is driven includes an active period in which the data voltage is applied to the pixel and a blank period in which an applying of the data voltage is stopped, wherein in the active period, a predetermined power voltage having a predetermined power voltage level is generated with a first generation cycle, and wherein in the blank period, the predetermined power voltage is generated with a second generation cycle longer than the first generation cycle.
  14. The display device (1A, 1060) of claim 13, wherein the frame period includes a first period to a fourth period, wherein in the first period, an active signal has an activation level, and a generation cycle of the predetermined power voltage has the second generation cycle, wherein in the second period following the first period, the active signal has the activation level, and the generation cycle has the first generation cycle, wherein in the third period following the second period, the active signal has an inactivation level, and the generation cycle has the first generation cycle, and wherein in the fourth period following the third period, the active signal has the activation level, and the generation cycle has the second generation cycle.
  15. An electronic device (1000) comprising: a display device of any of the preceding claims, wherein the driving controller (200) being configured to control the gate driver (300, 300A), the data driver (500) and the voltage outputter (700, 700A, 700B) based on an input control signal, and the electronic device further comprising a processor (1010) configured to output the input control signal to the driving controller (200).

Description

BACKGROUND 1. Field Embodiments of the inventive concept relate to a display device and an electronic device. More particularly, embodiments of the inventive concept relate to a display device an electronic device with reduced a power consumption. 2. Description of the Related Art Generally, a display apparatus includes a display panel and a display panel driver. The display panel includes a plurality of gate lines, a plurality of data lines, a plurality of emission lines and a plurality of pixels. The display panel driver includes a gate driver providing a gate signal to the gate lines, a data driver providing a data voltage to the data lines, an emission driver providing an emission signal to the emission lines and a driving controller controlling the gate driver, the data driver and the emission driver. SUMMARY Generally, when a charge pump circuit for generating a relatively low power voltage is operated, a power consumption of a display device may be increased. Embodiments of the inventive concept provide a display device with reduced a power consumption. Embodiments of the inventive concept also provide an electronic device a with reduced a power consumption. In an embodiment of the disclosure, a display device may include a display panel including a pixel, a gate driver configured to output a gate signal to the pixel, a data driver configured to apply a data voltage to the display panel, a voltage outputter configured to apply a gate high voltage having a first voltage level and a gate low voltage having a second voltage level lower than the first voltage level to the gate driver and a driving controller configured to control the gate driver, the data driver and the voltage outputter. The gate signal may be generated based on the gate high voltage and the gate low voltage. The driving controller may control a driving frequency of the display panel. The gate low voltage may be generated based on a predetermined power voltage having a predetermined power voltage level. A generation cycle of the predetermined power voltage may be controlled based on the driving frequency. If the driving frequency increase, the generation cycle may be decreased. The predetermined power voltage may be a negative voltage. A frame period of the driving frequency includes an active period in which the data voltage is applied and a blank period in which the applying of the data voltage is stopped. The generation cycle of the low power voltage may be controlled based on a length of the blank period. A generation cycle in an active period may be shorter than the generation cycle in the blank period. In an embodiment, when the driving frequency is higher than a reference driving frequency, the generation cycle may be decreased. In an embodiment, when the driving frequency is lower than a reference driving frequency, the generation cycle may be increased. The display panel may be driven as a variable frequency. The refence driving frequency may refer to one driving frequency among the variable frequencies of the display panel. For example, the refence driving frequency may be one of 60 Hz, 120 Hz, and 144 Hz. In an embodiment, the voltage outputter may include a voltage generating block configured to receive an input power voltage and a cycle control signal, and output the predetermined power voltage based on the input power voltage and the cycle control signal and a voltage converting block configured to output the gate low voltage based on the predetermined power voltage. The input power voltage may include a first input power voltage and a second input power voltage. An absolute value of the predetermined power voltage may be a sum of the first input power voltage and a second input power voltage. In an embodiment, the input power voltage may include a first input power voltage and a second input power voltage. The voltage generating block may include a first switching element including a first terminal receiving the first input power voltage and a second terminal connected to a first node, a second switching element including a first terminal receiving a ground voltage and a second electrode connected to a second node, a third switching element including a first terminal receiving the ground voltage and a second terminal connected to the first node, a first capacitor including a first electrode connected to the first node and a second electrode connected to the second node, a fourth switching element including a first terminal connected to the second node and a second terminal connected to a third node, a fifth switching element including a first terminal receiving the second input power voltage and a second terminal connected to the third node, a sixth switching element including a first terminal receiving the ground voltage and a second terminal connected to a fourth node, a second capacitor including a first electrode connected to the third node and a second electrode connected to the fourth node, a seventh switching eleme