Electronic device and driving method of electronic device

Patent metadata

Field	Value
Publication number	US-11749190-B2
Application number	US-202218045853-A
Country	US
Kind code	B2
Filing date	Oct 12, 2022
Priority date	Nov 22, 2021
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

An electronic device includes a display panel, a data driving circuit, a scan driving circuit, and a signal control circuit that receives input data. The signal control circuit includes a histogram check unit that divides data of one frame among the input data into a plurality of regions based on a gray scale and calculates a distribution of the data based on the plurality of regions, a gray check unit that calculates the number of major grayscales having data of a specific number or more among the input data, an optical waveform analysis unit that generates a signal calculated based on an optical waveform of the plurality of pixels, and a frequency selection unit that selects a driving frequency of the display panel based on the distribution of the data, the number of the major grayscales, and the signal.

First claim

What is claimed is:

1. An electronic device, comprising:
a display panel comprising a plurality of scan lines, a plurality of data lines, and a plurality of pixels, and configured to display an image;
a data driving circuit connected to the plurality of data lines;
a scan driving circuit connected to the plurality of scan lines; and
a signal control circuit configured to receive input data and control the display panel, the data driving circuit, and the scan driving circuit,
wherein the signal control circuit comprises:
a histogram check unit configured to divide data of one frame among the input data into a plurality of regions based on a gray scale and calculate a distribution of the data of the one frame based on the plurality of regions;
a gray check unit configured to calculate a number of major grayscales having data of a specific number or more among the input data;
an optical waveform analysis unit configured to generate a signal calculated based on an optical waveform of the plurality of pixels; and
a frequency selection unit configured to select a driving frequency of the display panel based on the distribution of the data of the one frame, the number of the major grayscales, and the signal.

2. The electronic device of claim 1 , wherein the display panel further comprises a photodiode disposed adjacent to the plurality of pixels.

3. The electronic device of claim 2 , wherein the optical waveform analysis unit calculates the signal based on the optical waveform, which is measured by the photodiode.

4. The electronic device of claim 2 , wherein an active region and a peripheral region disposed adjacent to the active region are defined in the display panel, and
wherein the photodiode is disposed in the peripheral region.

5. The electronic device of claim 2 , wherein, when viewed in a plan view, the photodiode does not overlap the plurality of pixels.

6. The electronic device of claim 1 , further comprising:
a memory comprising a lookup table comprising information of the optical waveform depending on the display panel, and
wherein the optical waveform analysis unit generates the signal based on the lookup table.

7. The electronic device of claim 1 , wherein the histogram check unit determines a type of the image based on the distribution of the data, and
wherein the type of the image comprises a moving image, a still image, and a text screen.

8. The electronic device of claim 7 , wherein the gray check unit determines the type of the image based on the number of the major grayscales.

9. The electronic device of claim 7 , wherein the plurality of regions comprise a low grayscale region, a middle grayscale region, and a high grayscale region, and
wherein the histogram check unit determines the type of the image as the text screen when the data are included in the low grayscale region and the high grayscale region by at least a predetermined specific ratio.

10. The electronic device of claim 1 , wherein the signal control circuit further includes a signal analysis unit configured to convert the signal into a frequency domain.

11. The electronic device of claim 1 , wherein the signal control circuit further comprises:
a sensitivity control unit comprising a time-to-sensitivity function,
wherein the frequency selection unit calculates the driving frequency based on the time-to-sensitivity function.

12. The electronic device of claim 1 , wherein the signal control circuit further comprises:
a register selection unit configured to select a register value depending on the selected driving frequency and output a data signal based on the register value,
wherein the display panel is driven based on the data signal.

13. A method of driving an electronic device, the method comprising:
receiving input data by a signal control circuit that controls a driving frequency of a display panel;
dividing data of one frame among the input data into a plurality of regions based on a gray scale and calculating a distribution of the data of the one frame based on the plurality of regions;
calculating a number of major grayscales having data of a specific number or more among the input data;
generating a signal calculated based on an optical waveform of the display panel; and
calculating the driving frequency based on the distribution of the data of the one frame, the number of the major grayscales, and the signal.

14. The method of claim 13 , wherein the display panel comprises a plurality of pixels and a photodiode disposed adjacent to the plurality of pixels, and
wherein generating the signal comprises receiving the optical waveform from the photodiode.

15. The method of claim 13 , wherein the signal is generated based on a lookup table comprising information of the optical waveform.

16. The method of claim 13 , wherein the display panel displays an image, and
wherein calculating the driving frequency based on the distribution of the data of the one frame comprises determining a type of the image based on the distribution.

17. The method of claim 16 , wherein calculating the number of major grayscales comprises determining the type of the image based on the number.

18. The method of claim 13 , further comprising:
converting the signal into a frequency domain.

19. The method of claim 13 , wherein calculating the driving frequency comprises:
receiving a time-to-sensitivity function; and
calculating the driving frequency based on the time-to-sensitivity function.

20. The method of claim 13 , further comprising:
selecting a register value depending on the driving frequency; and
outputting a data signal based on the register value.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Eunjung
• Kim Youra
• Kim Hyosun
• Hwang Hyungsuk

Classifications

• G09G3/3208 Primary

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• G09G3/20

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title