DRIVING METHOD AND DRIVING DEVICE OF DISPLAY PANEL, AND DISPLAY DEVICE

• US 20200135147A1
• Filed: 12/28/2019
• Published: 04/30/2020
• Est. Priority Date: 09/11/2019
• Status: Active Grant

• Current Assignee: Wuhan Tianma Micro-Electronics Company Limited (Wuhan Donghu New Technology Development Zone Production Promotion Centre)
• Original Assignee: Wuhan Tianma Micro-Electronics Company Limited (Wuhan Donghu New Technology Development Zone Production Promotion Centre)
• Inventors: TANG, Yuejun, LIANG, Xudong, WANG, Yongzhi, PENG, Tao
• Granted Patent: US 11,244,653 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2310/0221 with use of split matrices G09G3/3644 and G09G3/3666 take precedence
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

The present disclosure discloses a driving method and driving device of a display panel and a display device. Under the partial display mode, different gamma curves may be called for different display regions, to drive different regions of the same picture. In one embodiment, a first gamma curve with relatively low brightness may be called for a first display region provided with an under screen sensor, that is, the first display region is driven by the first gamma curve with the relatively low brightness. A second gamma curve with relatively high brightness may be called for a second display region in normal display, that is, the second display region is driven by the second gamma curve with the relatively high brightness.

Claims

1. A driving method of a display panel, comprising:

monitoring a display mode of the display panel when the display panel displays a picture, wherein the display panel comprises a first display region and a second display region, and the first display region is a semi-transparent region configured to set an under screen sensor;

when the display mode is monitored to be a partial display mode, for first pixels in the first display region;

calling a pre-stored first gamma curve, generating corresponding display information based on the first gamma curve, and driving the first pixels;

for second pixels in the second display region;

calling a pre-stored second gamma curve, generating corresponding display information based on the second gamma curve, and driving the second pixels, wherein

a maximum brightness value corresponding to a maximum gray-scale value in the first gamma curve is a first maximum brightness value, a maximum brightness value corresponding to a maximum gray-scale value in the second gamma curve is a second maximum brightness value, and the first maximum brightness value is less than the second maximum brightness value.

2. The driving method according to claim 1, further comprising:

when the display mode is monitored to be a full-screen display mode, for the first pixels in the first display region and the second pixels in the second display region;

calling the second gamma curve, generating corresponding display information based on the second gamma curve, and driving the first pixels and the second pixels.

3. The driving method according to claim 2, wherein the generating of the corresponding display information based on a gamma curve from the first gamma curve or the second gamma curve comprises:

determining a corresponding target brightness value in the gamma curve according to a target gray-scale value; and

determining a corresponding driving voltage and light emitting time according to the target brightness value.

4. The driving method according to claim 3, wherein in the full-screen display mode, the determining the corresponding driving voltage and light emitting time according to the target brightness value comprises:

increasing a driving voltage corresponding to the first pixels, wherein when a target brightness value corresponding to the first pixels is the same as a target brightness value corresponding to the second pixels, the driving voltage corresponding to the first pixels is greater than a driving voltage corresponding to the second pixels; and

/or,

prolonging light emitting time corresponding to the first pixels, wherein when a target brightness value corresponding to the first pixels is the same as a target brightness value corresponding to the second pixels, the light emitting time corresponding to the first pixels is greater than light emitting time corresponding to the second pixels.

5. The driving method according to claim 3, wherein in the partial display mode, the determining the corresponding driving voltage and light emitting time according to the target brightness value comprises:

decreasing a driving voltage corresponding to the first pixels, wherein when the driving voltage corresponding to the first pixels is the same as a driving voltage corresponding to the second pixels, a target brightness value corresponding to the first pixels is less than a target brightness value corresponding to the second pixels; and

/or,

shortening light emitting time corresponding to the first pixels wherein when light emitting time corresponding to the first pixels is the same as light emitting time corresponding to the second pixels, a target brightness value corresponding to the first pixels is less than a target brightness value corresponding to the second pixels.

6. The driving method according to claim 1, wherein the first gamma curve comprises a plurality of first sub gamma curves;

the second gamma curve comprises a plurality of second sub gamma curves;

first maximum brightness values of the first sub gamma curves are different;

second maximum brightness values of the second sub gamma curves are different;

the driving method further comprises;

monitoring a brightness adjustment mode when the display panel displays a picture;

in the partial display mode, when determining that the monitored brightness adjustment mode is an automatic adjustment mode, calling a first sub gamma curve and a second sub gamma curve according to received external environmental brightness, wherein when the external environmental brightness is higher, the first sub gamma curve with a larger first maximum brightness value and the second sub gamma curve with a larger second maximum brightness value are called; and

in a full-screen display mode, when determining that the monitored brightness adjustment mode is an automatic adjustment mode, calling the second sub gamma curve according to received external environmental brightness, wherein when the external environmental brightness is higher, the second sub gamma curve with a larger second maximum brightness value is called.

7. The driving method according to claim 6, further comprising:

in the partial display mode, when determining that the monitored brightness adjustment mode is a fixed brightness mode, calling the first sub gamma curve and the second sub gamma curve according to a currently selected fixed brightness, wherein when the fixed brightness is higher, the first sub gamma curve with a larger first maximum brightness value and the second sub gamma curve with a larger second maximum brightness value are called; and

in the full-screen display mode, when determining that the monitored brightness adjustment mode is a fixed brightness mode, calling the second sub gamma curve desired according to the currently selected fixed brightness, wherein when a selected fixed brightness is higher, the second sub gamma curve with a larger second maximum brightness value is called.

8. A driving device of a display panel, comprising:

a storing component, configured to store a first gamma curve and a second gamma curve, wherein a maximum brightness value corresponding to a maximum gray-scale value in the first gamma curve is a first maximum brightness value, and a maximum brightness value corresponding to a maximum gray-scale value in the second gamma curve is a second maximum brightness value, and the first maximum brightness value is less than the second maximum brightness value;

a monitoring component, configured to monitor a display mode of the display panel when the display panel displays a picture, wherein the display panel comprises a first display region and a second display region, and the first display region is a semi-transparent region configured to set an under screen sensor;

a calling component, configured to call a pre-stored first gamma curve for first pixels in the first display region and call a pre-stored second gamma curve for second pixels in the second display region when the monitoring component monitors that the display mode is a partial display mode; and

a generating component, configured to generate corresponding display information based on the first gamma curve and drive the first pixels, and generate corresponding display information based on the second gamma curve and drive the second pixels.

9. The driving device according to claim 8, wherein

the calling component is further configured to call the second gamma curve for the first pixels in the first display region and the second pixels in the second display region when the monitoring component monitors that the display mode is a full-screen display mode;

and

the generating component is further configured to generate corresponding display information based on the second gamma curve and drive the first pixels and the second pixels.

10. The driving device according to claim 9, wherein the generating component is further configured to determine a corresponding target brightness value in the first gamma curve or the second gamma curve according to a target gray-scale value, and determine a corresponding driving voltage and light emitting time according to the target brightness value;

wherein

in the full-screen display mode, a driving voltage corresponding to the first pixels is increased, wherein when a target brightness value corresponding to the first pixels is the same as a target brightness value corresponding to the second pixels, the driving voltage corresponding to the first pixels is greater than a driving voltage corresponding to the second pixels, and/or, light emitting time corresponding to the first pixels is prolonged, wherein when a target brightness value corresponding to the first pixels is the same as a target brightness value corresponding to the second pixels, the light emitting time corresponding to the first pixels is greater than light emitting time corresponding to the second pixels; and

in the partial display mode, a driving voltage corresponding to the first pixels is decreased, wherein when the driving voltage corresponding to the first pixels is the same as a driving voltage corresponding to the second pixels, a target brightness value corresponding to the first pixels is less than a target brightness value corresponding to the second pixels, and, light emitting time corresponding to the first pixels is shortened, wherein when light emitting time corresponding to the first pixels is the same as light emitting time corresponding to the second pixels, a target brightness value corresponding to the first pixels is less than a target brightness value corresponding to the second pixels.

11. The driving device according to claim 8, wherein the first gamma curve stored by the storing component comprises a plurality of first sub gamma curves;

the second gamma curve stored by the storing component comprises a plurality of second sub gamma curves;

first maximum brightness values of the first sub gamma curves are different;

second maximum brightness values of the second sub gamma curves are different;

the monitoring component is further configured to monitor a brightness adjustment mode when the display panel displays a picture;

the calling component is also configured to;

call a first sub gamma curve and a second sub gamma curve according to received external environmental brightness when determining that the monitored brightness adjustment mode is an automatic adjustment mode in the partial display mode, wherein when the external environmental brightness is higher, the first sub gamma curve with a larger first maximum brightness value and the second sub gamma curve with a larger second maximum brightness value are called;

call the second sub gamma curve according to received external environmental brightness when determining that the monitored brightness adjustment mode is an automatic adjustment mode in a full-screen display mode, wherein when the external environmental brightness is higher, the second sub gamma curve with a larger second maximum brightness value is called;

call the first sub gamma curve and the second sub gamma curve according to a currently selected fixed brightness when determining that the monitored brightness adjustment mode is a fixed brightness mode in the partial display mode, wherein when the fixed brightness is higher, the first sub gamma curve with a larger first maximum brightness value and the second sub gamma curve with a larger second maximum brightness value are called; and

call the second sub gamma curve desired according to the currently selected fixed brightness when determining that the monitored brightness adjustment mode is a fixed brightness mode in the full-screen display mode, wherein when a selected fixed brightness is higher, the second sub gamma curve with a larger second maximum brightness value is called.

12. A display device, comprising:

a display panel, comprising a first display region and a second display region, wherein the first display region is a semi-transparent region configured to set an under screen sensor;

a sensor arranged corresponding to the first display region; and

a driving device comprising;

a storing component, configured to store a first gamma curve and a second gamma curve, wherein a maximum brightness value corresponding to a maximum gray-scale value in the first gamma curve is a first maximum brightness value, and a maximum brightness value corresponding to a maximum gray-scale value in the second gamma curve is a second maximum brightness value, and the first maximum brightness value is less than the second maximum brightness value;

a monitoring component, configured to monitor a display mode of the display panel when the display panel displays a picture, wherein the display panel comprises a first display region and a second display region, and the first display region is a semi-transparent region configured to set an under screen sensor;

a calling component, configured to call a pre-stored first gamma curve for first pixels in the first display region and call a pre-stored second gamma curve for second pixels in the second display region when the monitoring component monitors that the display mode is a partial display mode; and

a generating component, configured to generate corresponding display information based on the first gamma curve and drive the first pixels, and generate corresponding display information based on the second gamma curve and drive the second pixels.

13. The display device according to claim 12, wherein

the calling component is further configured to call the second gamma curve for the first pixels in the first display region and the second pixels in the second display region when the monitoring component monitors that the display mode is a full-screen display mode;

and

the generating component is further configured to generate corresponding display information based on the second gamma curve and drive the first pixels and the second pixels.

14. The display device according to claim 13, wherein the generating component is further configured to determine a corresponding target brightness value in the first gamma curve or the second gamma curve according to a target gray-scale value, and determine a corresponding driving voltage and light emitting time according to the target brightness value;

wherein

in the full-screen display mode, a driving voltage corresponding to the first pixels is increased, wherein when a target brightness value corresponding to the first pixels is the same as a target brightness value corresponding to the second pixels, the driving voltage corresponding to the first pixels is greater than a driving voltage corresponding to the second pixels, and/or, light emitting time corresponding to the first pixels is prolonged when a target brightness value corresponding to the first pixels is the same as a target brightness value corresponding to the second pixels, the light emitting time corresponding to the first pixels is greater than light emitting time corresponding to the second pixels; and

in the partial display mode, a driving voltage corresponding to the first pixels is decreased, wherein when the driving voltage corresponding to the first pixels is the same as a driving voltage corresponding to the second pixels, a target brightness value corresponding to the first pixels is less than a target brightness value corresponding to the second pixels, and, light emitting time corresponding to the first pixels is shortened, wherein when light emitting time corresponding to the first pixels is the same as light emitting time corresponding to the second pixels, a target brightness value corresponding to the first pixels is less than a target brightness value corresponding to the second pixels.

15. The display device according to claim 12, wherein the first gamma curve stored by the storing component comprises a plurality of first sub gamma curves;

the second gamma curve stored by the storing component comprises a plurality of second sub gamma curves;

first maximum brightness values of the first sub gamma curves are different;

second maximum brightness values of the second sub gamma curves are different;

the monitoring component is further configured to monitor a brightness adjustment mode when the display panel displays a picture;

the calling component is also configured to;

call a first sub gamma curve and a second sub gamma curve according to received external environmental brightness when determining that the monitored brightness adjustment mode is an automatic adjustment mode in the partial display mode, wherein when the external environmental brightness is higher, the first sub gamma curve with a larger first maximum brightness value and the second sub gamma curve with a larger second maximum brightness value are called;

call the second sub gamma curve according to received external environmental brightness when determining that the monitored brightness adjustment mode is an automatic adjustment mode in a full-screen display mode, wherein when the external environmental brightness is higher, the second sub gamma curve with a larger second maximum brightness value is called;

call the first sub gamma curve and the second sub gamma curve according to a currently selected fixed brightness when determining that the monitored brightness adjustment mode is a fixed brightness mode in the partial display mode, wherein when the fixed brightness is higher, the first sub gamma curve with a larger first maximum brightness value and the second sub gamma curve with a larger second maximum brightness value are called; and

call the second sub gamma curve desired according to the currently selected fixed brightness when determining that the monitored brightness adjustment mode is a fixed brightness mode in the full-screen display mode, wherein when a selected fixed brightness is higher, the second sub gamma curve with a larger second maximum brightness value is called.

16. The display device according to claim 12, wherein a pixel density of first pixels in the first display region is less than a pixel density of second pixels in the second display region;

and/or, an opening area of first pixels in the first display region is less than an opening area of second pixels in the second display region.

17. The display device according to claim 12, wherein the sensor is at least one of a light sensor, a distance sensor, a camera, a receiver, a depth sensor or an iris recognition sensor.