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KR-20260067501-A - DISPLAY DEVICE AND METHOD OF DRIVING THE SAME, AND ELECTRONIC DEVICE

KR20260067501AKR 20260067501 AKR20260067501 AKR 20260067501AKR-20260067501-A

Abstract

A display device according to embodiments of the present invention comprises pixels having a driving transistor and a bias transistor connected between a first electrode of the driving transistor and a bias power line to which a bias power source is input and which turns on when a bias scan signal is input; a scanning driving unit for supplying the bias scan signal; a frame period includes a display scanning period in which a data signal is input to the pixels and a self-scanning period in which the pixels emit light while maintaining the data signal, and the scanning driving unit supplies the bias scan signal having different widths during the display scanning period and the self-scanning period.

Inventors

  • 김웅

Assignees

  • 삼성디스플레이 주식회사

Dates

Publication Date
20260513
Application Date
20241105

Claims (20)

  1. Pixels having a driving transistor and a bias transistor connected between a first electrode of the driving transistor and a bias power line to which a bias power supply is input, and which turns on when a bias scan signal is input; It is equipped with a scanning drive unit for supplying the above-mentioned bias scanning signal; A display device comprising a frame period including a display scan period in which a data signal is input to the pixels and a self scan period in which the pixels emit light while maintaining the data signal, wherein the scan driving unit supplies the bias scan signal having different widths during the display scan period and the self scan period.
  2. In Article 1, The above injection driving unit supplies a bias injection signal of a first width during the above display injection period and supplies a bias injection signal of a second width narrower than the first width during the above self-injection period.
  3. In Article 2, The above frame period includes two or more self-injection periods, and the injection driving unit is a display device that gradually changes the bias injection signal from the first width to the second width during the two or more self-injection periods.
  4. In Paragraph 3, A timing control unit that controls the above injection drive unit; A display device comprising a start signal generation unit included in the above timing control unit and for supplying a scan start signal to the above scan driving unit so as to control the width of the above bias scan signal.
  5. In Paragraph 4, The above-mentioned start signal generating unit receives driving frequency information and a display device that determines the number of the above-mentioned self-injection periods included in one frame period in correspondence with the driving frequency information.
  6. In Article 1, A timing control unit that controls the above injection drive unit; A display device comprising a start signal generator included in the timing control unit and generating a scan start signal such that the width of the bias scan signal is controlled based on a driving frequency, a dimming level, and an average gradation of one frame.
  7. In Article 6, The above-mentioned start signal generating unit is a display device that generates the scan start signal such that the width of the bias scan signal becomes narrower as the driving frequency increases.
  8. In Article 7, The above-mentioned start signal generating unit is a display device that generates the scan start signal such that the width of the bias scan signal changes stepwise when the above-mentioned driving frequency is changed.
  9. In Article 6, The above-mentioned start signal generating unit is a display device that generates the scan start signal such that the width of the bias scan signal becomes narrower as the dimming level increases.
  10. In Article 6, The above-mentioned start signal generating unit is a display device that generates the scan start signal such that the width of the bias scan signal becomes narrower as the average grayscale increases.
  11. In Article 1, A display device further comprising a bias voltage generating unit for generating the above-mentioned bias power, wherein the bias voltage generating unit supplies the bias voltage, which maintains a constant voltage during the above-mentioned frame period, to the above-mentioned bias power line.
  12. In Article 1, A display device further comprising a bias voltage generating unit for generating the above-mentioned bias power, wherein the bias voltage generating unit supplies the above-mentioned bias power of a first voltage to the above-mentioned bias power line during the above-mentioned display scanning period and supplies the above-mentioned bias power of a second voltage lower than the first voltage to the above-mentioned bias power line during the above-mentioned self-scanning period.
  13. Pixels having a driving transistor and a bias transistor connected between a first electrode of the driving transistor and a bias power line to which a bias power supply is input, and which turns on when a bias scan signal is input; It comprises a bias voltage generating unit for changing the voltage of the bias power supply in correspondence with at least one of a dimming level, an average gradation of one frame, and a driving frequency; A display device comprising a frame period including a display scanning period in which a data signal is input to the pixels and a plurality of self-scanning periods in which the pixels emit light while maintaining the data signal, wherein the bias voltage generating unit gradually lowers the bias voltage during the plurality of self-scanning periods.
  14. In Article 13, The above bias voltage generating unit is a display device that lowers the voltage of the bias power supply when the driving frequency increases.
  15. In Article 13, The above bias voltage generating unit is a display device that lowers the voltage of the bias power supply when the dimming level increases.
  16. In Article 13, The above bias voltage generating unit is a display device that lowers the voltage of the bias power supply when the average grayscale increases.
  17. A driving method for a display device comprising a driving transistor and pixels that supply a voltage of a bias power supply to the driving transistor when a bias scan signal is input, A step of supplying a bias scan signal of a first width during a display scan period in which a data signal is input to the pixels; A driving method for a display device comprising the step of supplying a bias scanning signal of a second width during a plurality of self-scanning periods in which the pixels emit light while maintaining the above data signal.
  18. In Article 17, A driving method for a display device in which the second width is narrower than the first width.
  19. In Article 18, A driving method for a display device in which the bias injection signal is gradually narrowed from the first width to the second width during the plurality of self-injection periods.
  20. Pixels having a driving transistor and a bias transistor connected between a first electrode of the driving transistor and a bias power line to which a bias power supply is input, and which turns on when a bias scan signal is input; A gate driver for supplying the above bias scan signal; An electronic device comprising a frame period including a display scan period in which a data signal is input to the pixels and a self scan period in which the pixels emit light while maintaining the data signal, wherein the gate driver supplies the bias scan signal having different widths during the display scan period and the self scan period.

Description

Display device and method of driving the display device, and electronic device The present invention relates to a display device, a method for driving a display device, and an electronic device. With the advancement of information technology, the importance of display devices, which serve as a medium connecting users and information, is being highlighted. In response to this, the use of display devices such as Liquid Crystal Displays (LCDs) and Organic Light Emitting Displays (OLEDs) is increasing. FIG. 1 is a drawing showing a display device according to one embodiment of the present invention. FIG. 2 is a drawing showing an embodiment of the scanning driving unit and the light-emitting driving unit illustrated in FIG. 1. FIG. 3 is a drawing showing a pixel according to one embodiment of the present invention. FIG. 4 is a waveform diagram showing an example of a method for driving a pixel of FIG. 3 during a display scanning period. Figure 5 is a waveform diagram showing an example of a method for driving a pixel of Figure 3 during a self-injection period. FIG. 6 is a diagram showing an example of a bias power supply supplied during one frame period. FIG. 7 is a diagram showing an example of a bias power supply corresponding to a driving frequency. FIG. 8 is a drawing showing a bias voltage generating unit according to one embodiment of the present invention. FIG. 9 is a drawing showing an embodiment of the bias voltage generating unit illustrated in FIG. 8. FIG. 10 is a diagram showing an example of a bias voltage generated by a bias voltage generating unit. Figure 11 is a diagram showing the operation process of the offset calculation unit illustrated in Figure 9. FIG. 12 is a diagram showing an example of a bias voltage generated by a bias voltage generating unit. FIG. 13 is a drawing showing a start signal generating unit according to one embodiment of the present invention. FIGS. 14 to 17 are drawings showing the width of the bias scan signal by the start signal generation unit of FIG. 13. FIG. 18 is a drawing showing one embodiment of a bias voltage generating unit. FIG. 19 is a drawing showing a start signal generating unit according to one embodiment of the present invention. FIG. 20 is a drawing showing an electronic device according to one embodiment of the present invention. FIGS. 21 to 24 are exemplary drawings illustrating electronic devices according to various embodiments. Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are assigned to identical or similar components throughout the specification. Accordingly, the reference numerals described above may also be used in other drawings. Furthermore, the expression "identical" in the explanation may mean "substantially identical." In other words, it may be an identicality to the extent that a person with ordinary knowledge would accept it as such. Other expressions may also be those in which "substantially" has been omitted. Some embodiments are described in the accompanying drawings in relation to functional blocks, units, and/or modules. Those skilled in the art will understand that these blocks, units, and/or modules are physically implemented by logic circuits, individual components, microprocessors, hardwired circuits, memory elements, wiring connections, and other electronic circuits. These may be formed using semiconductor-based manufacturing techniques or other manufacturing techniques. In the case of blocks, units, and/or modules implemented by microprocessors or other similar hardware, they may be programmed and controlled using software to perform the various functions discussed in the present invention, and may optionally be driven by firmware and/or software. Additionally, each block, unit, and/or module may be implemented by dedicated hardware, or by a combination of dedicated hardware performing some functions and a processor performing other functions (e.g., one or more programmed microprocessors and associated circuits). Furthermore, in some embodiments, blocks, units, and/or modules may be physically separated into two or more individual blocks, units, and/or modules that interact within the scope of the concept of the present invention without departing from the scope of the present invention. Additionally, in some embodiments, blocks, units, and/or modules may be combined into physically more complex blocks, units, and/or modules within the scope of the concept of the present invention. The term “connection” between two components may mean that it encompasses both electrical and physical connections, but is not necessarily limited