TWI701653B - A brightness switching method during display drive mode switching and display device using the same - Google Patents

Abstract

A brightness switching method during display driving mode switching includes: using a state control module to receive a mode switching command to control the conversion between a first gamma curve and a second gamma curve, wherein the first gamma curve A first maximum brightness corresponding to the maximum gray scale value of the curve is corresponding to an intermediate gray scale value of the second gamma curve; when the mode switching instruction instructs to switch from the first gamma curve to the second gamma curve In the case of two gamma curves, the state control module first maintains the selection of the first gamma curve, so that a brightness control module is dimmed to the first maximum brightness along the first gamma curve in the forward direction, and then The state control module then selects the second gamma curve, so that the brightness control module is forwardly dimmed from the intermediate gray level value to a positive target gray level value along the second gamma curve; And when the mode switching instruction instructs to switch from the second gamma curve to the first gamma curve, the state control module first maintains the selection of the second gamma curve so that the brightness control module follows The second gamma curve is negatively dimmed to the intermediate grayscale value, and then the state control module selects the first gamma curve so that the brightness control module follows the first gamma curve , The light is dimmed negatively from the intermediate grayscale value to a negative target grayscale value.

Description

A brightness switching method during display driving mode switching and display device using the same

The present invention relates to a brightness control method of a display screen, in particular to a brightness switching method when the display drive mode is switched.

The current display driver chip usually dimming the brightness changes in the same display mode according to a gamma curve to prevent the picture from flickering; and when switching between different display modes, it usually switches the gamma directly. Gamma curve, which converts the display data into brightness with different gamma curves.

However, when the mode is switched, as shown in Figure 1, the gamma curve is changed in the same frame and the brightness conversion is directly performed between the two gamma curves (the conversion path is composed of path a1 and path a2, and path a1 will produce brightness discontinuity) usually causes the display brightness to be discontinuous, resulting in the phenomenon of blinking on the screen. However, flicker is an important defect that the display must try to avoid.

In order to solve the above problems, a novel brightness control method of the display screen is urgently needed in the art.

An object of the present invention is to disclose a brightness switching method when the display driving mode is switched, which can prevent the display screen from flickering when the display driving mode is switched.

Another object of the present invention is to disclose a display device, which can avoid flickering of the display screen when the display driving mode is switched.

To achieve the above objective, a brightness switching method during display drive mode switching is proposed, which is applied to a driver chip and includes:

A state control module is used to receive a mode switching command to control the conversion between a first gamma curve and a second gamma curve, wherein the maximum gray scale value of the first gamma curve corresponds to a first maximum The brightness corresponds to an intermediate grayscale value of the second gamma curve; and

When the mode switching instruction instructs to switch from the first gamma curve to the second gamma curve, the state control module first maintains the selection of the first gamma curve, so that a brightness control module follows the The first gamma curve is positively dimmed to the first maximum brightness, and then the state control module selects the second gamma curve so that the brightness control module follows the second gamma curve, The light is dimmed in a positive direction from the intermediate gray level value to a positive target gray level value.

In an embodiment, the brightness switching method during display driving mode switching further includes:

When the mode switching instruction instructs to switch from the second gamma curve to the first gamma curve, the state control module first maintains the selection of the second gamma curve, so that the brightness control module follows the The second gamma curve is negatively dimmed to the intermediate grayscale value, and then the state control module selects the first gamma curve to make the brightness control module follow the first gamma curve, Negative dimming from the intermediate gray level value to a negative target gray level value.

To achieve the above objective, the present invention further provides a display device having a display screen and a driving chip for driving the display screen, the driving chip having a state control module, a brightness control module and a gamma voltage Generating module, wherein the gamma voltage generating module generates a gamma voltage to drive the display tomb according to the control of the state control module and the brightness control module, and is characterized in that the driving chip can perform a display The brightness switching method when the driving mode is switched, the method includes:

The state control module is used to receive a mode switching command to control the conversion between a first gamma curve and a second gamma curve, wherein the maximum gray scale value of the first gamma curve corresponds to a first maximum The brightness corresponds to an intermediate grayscale value of the second gamma curve; and

When the mode switching instruction instructs to switch from the first gamma curve to the second gamma curve, the state control module first maintains the selection of the first gamma curve, so that the brightness control module follows the The first gamma curve is positively dimmed to the first maximum brightness, and then the state control module selects the second gamma curve so that the brightness control module follows the second gamma curve, The light is dimmed in a positive direction from the intermediate gray level value to a positive target gray level value.

In an embodiment, the brightness switching method when the display driving mode is switched further includes:

When the mode switching instruction instructs to switch from the second gamma curve to the first gamma curve, the state control module first maintains the selection of the second gamma curve, so that the brightness control module follows the The second gamma curve is negatively dimmed to the intermediate grayscale value, and then the state control module selects the first gamma curve to make the brightness control module follow the first gamma curve, Negative dimming from the intermediate gray level value to a negative target gray level value.

In one embodiment, the driver chip further has a mobile industrial processor interface and a weighting unit, wherein the mobile industrial processor interface is used to transmit the mode switching command, and the weighting unit is used to generate a weighting unit. Gray scale value, the gamma voltage generating module selects a gamma curve according to the control of the state control module, the brightness control module and the weighting unit, and corresponds to the gamma curve according to the weighted gray scale value A brightness value is generated, and then a gamma voltage is generated according to the brightness value to drive the display screen, wherein the weighted gray scale value is obtained by multiplying a pixel data by a brightness control value output by the brightness control module produce.

In an embodiment, the brightness switching method when the display driving mode is switched further includes:

When the mode switching instruction instructs to switch from the second gamma curve to the first gamma curve, the state control module first maintains the selection of the second gamma curve, so that the brightness control module follows the The second gamma curve is negatively dimmed to the intermediate grayscale value, and then the state control module selects the first gamma curve to make the brightness control module follow the first gamma curve, Negative dimming from the intermediate gray level value to a negative target gray level value.

In possible embodiments, the display device may be a liquid crystal display device, an LED display device or a Micro-LED display device.

In order to enable your reviewer to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are attached as follows.

Please refer to FIG. 2, which shows a flowchart of an embodiment of the brightness switching method when the display driving mode is switched according to the present invention. The method is applied to a driving chip and includes: using a state control module to receive a mode The switching command is used to control the conversion between a first gamma curve and a second gamma curve, wherein a first maximum brightness corresponding to the maximum gray scale value of the first gamma curve corresponds to the second gamma An intermediate gray scale value of the curve (step a); when the mode switching instruction instructs to switch from the first gamma curve to the second gamma curve, the state control module first maintains the selection of the first gamma curve Curve to make a brightness control module forward dimming along the first gamma curve to the first maximum brightness, and then the state control module selects the second gamma curve to control the brightness The module is forwardly dimmed from the intermediate grayscale value to a positive target grayscale value along the second gamma curve (step b); and when the mode switching command instructs the second gamma curve When switching to the first gamma curve, the state control module first maintains the selection of the second gamma curve, so that the brightness control module is dimmed in the negative direction along the second gamma curve to the middle Grayscale value, and then the state control module selects the first gamma curve, so that the brightness control module is dimmed from the negative direction of the intermediate grayscale value to a negative direction along the first gamma curve Target gray scale value (step c).

Please refer to FIG. 3, which is a schematic diagram of forward dimming on two gamma curves using the brightness switching method of FIG. 2. As shown in FIG. 3, in the process of the forward dimming, the present invention first dims the light according to a low-brightness gamma curve (first gamma curve curve1) in the forward direction to start from a starting point of the first gamma curve curve1 A moves through a path b1 to a first end point B, and the first end point B represents a first maximum brightness curve1.max corresponding to the maximum gray scale value (255) of the first gamma curve curve1; The high-brightness gamma curve (second gamma curve curve2) is dimmed in the forward direction to move from a starting point C of the second gamma curve curve2 to a second end point D via a path b2, wherein the brightness of the starting point C The value is equal to the first maximum brightness curve1.max, and the starting point C corresponds to an intermediate gray-scale value corp, so as to keep the brightness continuous during the dimming process of the display mode switch to avoid flickering of the screen.

Please refer to FIG. 4, which is a schematic diagram of negative dimming on two gamma curves using the brightness switching method of FIG. As shown in FIG. 4, during the negative dimming process, the present invention first dims the light according to the high-brightness gamma curve (the second gamma curve curve2) in the negative direction to start from a starting point of the second gamma curve curve2 A moves to a first end point B via a path b1, the brightness value of the first end point B is equal to the first maximum brightness curve1.max, and the first end point B corresponds to the intermediate grayscale value corp; , According to the low-brightness gamma curve (first gamma curve curve1) negative dimming to move from a starting point C of the first gamma curve curve1 to a second end point D via a path b2, wherein the starting point The brightness value of C is equal to the first maximum brightness curve1.max, and the starting point C corresponds to the maximum grayscale value (255), in order to keep the brightness continuous during the dimming process of the display mode switch to avoid screen generation Flicker phenomenon.

Based on the above principle description, the present invention further provides a display device. Please refer to FIG. 5, which shows a block diagram of an embodiment of the display device of the present invention. As shown in FIG. 5, the display device (which can be a liquid crystal display device, an LED display device or a Micro-LED display device) has a display screen 100 and a driving chip 110 for driving the display screen 100, and the driving chip 110 has a Mobile industry processor interface 111, a state control module 112, a brightness control module 113, a gamma voltage generation module 114 and a weighting unit 115, wherein the mobile industry processor interface 111 is used to transmit a mode switch Command, the gamma voltage generation module 114 selects a gamma curve according to the control of the state control module 112, the brightness control module 113, and the weighting unit 115, and according to a weighted gray scale value generated by the weighting unit 115 A brightness value is corresponding to the brightness value, and then a gamma voltage is generated according to the brightness value to drive the display screen 100, wherein the weighted gray scale value is a multiplication of the pixel data by the brightness control value output by the brightness control module 113 Operation.

The driving chip 110 is characterized in that it can perform a brightness switching method when the display driving mode is switched. The method includes: using the state control module 112 to receive a mode switching command to control a first gamma curve and a second gamma curve. Conversion between Gamma curves, wherein a first maximum brightness corresponding to the maximum gray scale value of the first gamma curve corresponds to an intermediate gray scale value of the second gamma curve. The state control module 112 will notify the brightness control module 113 after receiving the mode switching command, and the brightness control module 113 will notify the state control module after moving from the starting point A to the first end point B via a path b1 112 performs curve switching.

When the mode switching instruction instructs to switch from the first gamma curve to the second gamma curve, the state control module 112 first maintains the selection of the first gamma curve, so that the brightness control module 113 follows the The first gamma curve is positively dimmed to the first maximum brightness, and then the state control module 112 selects the second gamma curve so that the brightness control module 113 follows the second gamma curve, Forward dimming from the intermediate grayscale value to a positive target grayscale value; and when the mode switching instruction instructs to switch from the second gamma curve to the first gamma curve, the state control module 112 The second gamma curve is maintained to be selected first, so that the brightness control module 113 is dimmed to the intermediate gray level along the negative direction of the second gamma curve, and then the state control module 112 selects the first The gamma curve causes the brightness control module 113 to dim the light from the intermediate gray scale value to a negative target gray scale value along the first gamma curve. According to this dimming method, the display device of FIG. 5 can keep the brightness continuous during the dimming process of the display mode switching, thereby avoiding the flickering phenomenon of the screen.

The disclosure in this case is a preferred embodiment, and any partial changes or modifications that are derived from the technical ideas of the case and can be easily inferred by those who are familiar with the art do not deviate from the scope of the patent right of the case.

In summary, regardless of the purpose, means, and effects of this case, it is shown that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. Please check it out and grant the patent as soon as possible. Society is for the best prayer.

Step a: Use a state control module to receive a mode switching command to control the conversion between a first gamma curve and a second gamma curve, wherein the maximum gray scale value of the first gamma curve corresponds to a The first maximum brightness corresponds to an intermediate gray scale value of the second gamma curve Step b: When the mode switching instruction instructs to switch from the first gamma curve to the second gamma curve, the state control module first maintains the selection of the first gamma curve to enable a brightness control module Dimming in the forward direction along the first gamma curve to the first maximum brightness, and then the state control module selects the second gamma curve to make the brightness control module follow the second gamma curve Ma curve, from the intermediate gray level value forward dimming to a positive target gray level value Step c: When the mode switching instruction instructs to switch from the second gamma curve to the first gamma curve, the state control module first maintains the selection of the second gamma curve to enable the brightness control module Dimming in the negative direction along the second gamma curve to the intermediate grayscale value, and then the state control module selects the first gamma curve to make the brightness control module follow the first gamma curve Ma curve, dimming from the intermediate gray level value negatively to a negative target gray level value 100: display 110: driver chip 111: Mobile Industry Processor Interface 112: Status control module 113: Brightness Control Module 114: Gamma voltage generation module 115: weighting unit

FIG. 1 is a schematic diagram illustrating the operation of changing the gamma curve in the same frame of the prior art and directly performing discontinuous brightness conversion between two gamma curves. 2 is a flowchart of an embodiment of the brightness switching method when the display driving mode is switched according to the present invention. 3 is a schematic diagram of forward dimming on two gamma curves using the brightness switching method of FIG. 2. 4 is a schematic diagram of negative dimming on two gamma curves using the brightness switching method of FIG. 2. FIG. 5 is a block diagram of an embodiment of the display device of the present invention.

Step a: Use a state control module to receive a mode switching command to control the conversion between a first gamma curve and a second gamma curve, wherein the maximum gray scale value of the first gamma curve corresponds to a The first maximum brightness corresponds to an intermediate gray scale value of the second gamma curve

Step b: When the mode switching instruction instructs to switch from the first gamma curve to the second gamma curve, the state control module first maintains the selection of the first gamma curve to enable a brightness control module Dimming in the forward direction along the first gamma curve to the first maximum brightness, and then the state control module selects the second gamma curve to make the brightness control module follow the second gamma curve Ma curve, from the intermediate gray level value forward dimming to a positive target gray level value

Step c: When the mode switching instruction instructs to switch from the second gamma curve to the first gamma curve, the state control module first maintains the selection of the second gamma curve to enable the brightness control module Dimming in the negative direction along the second gamma curve to the intermediate grayscale value, and then the state control module selects the first gamma curve to make the brightness control module follow the first gamma curve Ma curve, dimming from the middle gray level value negatively to a negative target gray level value

Claims (5)

A brightness switching method when the display driving mode is switched is applied to a driving chip, the driving chip includes a state control module, a brightness control module, a gamma voltage generation module, and a mobile industrial processor interface And a weighting unit, the gamma voltage generating module generates a gamma voltage to drive a display screen according to the control of the state control module and the brightness control module. The method includes: using the state control module to receive a The mode switching command controls the conversion between a first gamma curve and a second gamma curve, wherein a first maximum brightness corresponding to the maximum gray scale value of the first gamma curve corresponds to the second gamma curve An intermediate gray scale value of the curve; and when the mode switching instruction instructs to switch from the first gamma curve to the second gamma curve, the state control module first maintains the selection of the first gamma curve , Make a brightness control module forward dimming along the first gamma curve to the first maximum brightness, and then the state control module selects the second gamma curve to make the brightness control module Along the second gamma curve, dimming from the intermediate gray level value to a positive target gray level value; wherein, the mobile industry processor interface is used to transmit the mode switching command, and the weighting The unit is used to generate a weighted grayscale value. The gamma voltage generation module selects a gamma curve according to the control of the state control module, the brightness control module, and the weighting unit, and according to the weighted grayscale value A brightness value is corresponding to the gamma curve, and then a gamma voltage is generated according to the brightness value to drive the display screen, and the weighted gray scale value is a brightness control value output by the brightness control module to a The pixel data is generated by a multiplication operation. As described in the first item of the scope of patent application, the brightness switching method during display driving mode switching further includes: when the mode switching instruction instructs to switch from the second gamma curve to the first gamma curve, The state control module first maintains the selection of the second gamma curve, so that the brightness control module is dimmed to the intermediate gray level along the negative direction of the second gamma curve, and then the state control module The first gamma curve is selected so that the brightness control module is dimmed in a negative direction from the intermediate gray scale value to a negative target gray scale value along the first gamma curve. A display device having a display screen and a driving crystal for driving the display screen Chip, the driver chip has a state control module, a brightness control module, a gamma voltage generation module, a mobile industry processor interface and a weighting unit, wherein the gamma voltage generation module is controlled according to the state The control of the module and the brightness control module generates a gamma voltage to drive the display screen, characterized in that the driver chip can execute a brightness switching method when the display driving mode is switched, and the method includes: using the state control The module receives a mode switching command to control the conversion between a first gamma curve and a second gamma curve, wherein a first maximum brightness corresponding to the maximum gray scale value of the first gamma curve corresponds to An intermediate gray scale value of the second gamma curve; and when the mode switching instruction instructs to switch from the first gamma curve to the second gamma curve, the state control module first maintains the selection of the second gamma curve A gamma curve to make the brightness control module forward dimming along the first gamma curve to the first maximum brightness, and then the state control module selects the second gamma curve to make the The brightness control module is forwardly dimmed from the intermediate grayscale value to a positive target grayscale value along the second gamma curve; wherein, the mobile industry processor interface is used to transmit the mode switch Command, the weighting unit is used to generate a weighted gray scale value, the gamma voltage generating module selects a gamma curve according to the control of the state control module, the brightness control module and the weighting unit, and according to the The weighted gray scale value corresponds to a brightness value on the gamma curve, and then a gamma voltage is generated according to the brightness value to drive the display screen, and the weighted gray scale value is a brightness output by the brightness control module The control value is generated by performing a multiplication operation on a pixel data. According to the display device described in claim 3, wherein the brightness switching method when the display driving mode is switched further includes: when the mode switching instruction instructs to switch from the second gamma curve to the first In the case of the gamma curve, the state control module first maintains the selection of the second gamma curve, so that the brightness control module is dimmed to the intermediate gray level along the second gamma curve in the negative direction, and then the The state control module then selects the first gamma curve, so that the brightness control module follows the first gamma curve and dims the light from the intermediate gray scale value to a negative target gray scale value. As the display device described in any one of items 3 to 4 in the scope of patent application, it is composed of liquid A display device selected by the group consisting of a crystal display device, an LED display device, and a Micro-LED display device.

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