TWI497482B - Display apparatus and the method of refreshing frames displayed thereon - Google Patents

Description

Display and update method of display screen

The invention relates to a low power consumption image display technology, in particular to a low power consumption display and a display screen updating method thereof.

The display has been widely used in various electronic products, such as computer equipment with a display screen, a mobile phone, or a digital photo frame, and the power-saving operation mode based on the technology of the screen dormancy has become one of the development priorities of the current display. At present, this is often achieved by reducing the scanning frequency of the screen display, for example, Seamless Dynamic Refresh Rate Switching (SDRRS), which has a limited power saving effect. In addition, it has also been proposed to configure the memory on the display panel to store the image data for updating, so that the system circuit and the display circuit of the display can directly enter the power saving mode without continuously scanning the screen, thereby reducing The consumption of electrical energy, but the accompanying disadvantage is the extra cost of memory production.

Therefore, it is necessary to develop a new display screen update technology to further improve the power saving effect of the display.

To achieve this, in accordance with an aspect of the present invention, a first embodiment provides a display including: a control unit having at least two modes of operation, normal and standby; and a display unit including a driving circuit and a display panel. The driving circuit has at least two modes of operation, normal and standby; And an operation interface, the control unit and the driving circuit are configured to provide a video frame data signal from the control unit to the driving circuit, and a picture update control signal is between the control unit and the driving circuit Two-way transmission; wherein the control unit transmits an image frame of the data stream to the driving circuit via the operation interface, and the driving circuit drives the display panel according to the sequence of the image frames of the data stream to update The screen displayed by the display panel.

According to another aspect of the present invention, a second embodiment provides a method for updating a display screen, including: (A) providing a display including a control unit and a display unit having a driving circuit and a display panel, the control unit There are at least two modes of operation, normal and standby, the driving circuit has at least two operating modes, normal and standby, and the control unit and the driving circuit respectively operate in their normal mode; (B) the control unit transmits a data stream The image frame is given to the driving circuit, and the driving circuit drives the display panel according to the order of the image frames of the data stream to update the screen displayed by the display panel; wherein, when the data stream is transmitted The control unit enters its standby mode; when receiving the data stream, the driving circuit drives the display unit according to the last image frame of the data stream and enters its standby mode; (C) the driving circuit Entering its normal mode and requesting the control unit to update the screen displayed by the display panel; and (D) the control unit enters its normal mode And transmitting the data stream of the last frame image information to the driving circuit, and enters its standby mode; and the driving circuit according to the last image frame information to drive the display panel, and enters its standby mode.

According to another aspect of the present invention, a third embodiment provides a method for updating a display screen, comprising: (A) providing a display including a control The unit and a display unit having a driving circuit and a display panel, the control unit has two operating modes, normal and standby, the driving circuit has two operating modes: normal and standby, and the control unit and the driving circuit respectively operate in their normal operation. In the mode, (B) the control unit transmits an image frame of the data stream to the driving circuit, and the driving circuit drives the display panel according to the order of the image frames of the data stream to update the display panel a displayed image; wherein the control unit or the driving circuit detects the data stream and compares a specific number of successive adjacent image frames, when the specific number of successive adjacent image frames meets a specific condition, The control unit and the driving circuit can obtain a handshake confirmation, and the control unit enters its standby mode, and the driving circuit drives the display panel according to the received last image frame and enters its standby mode; (C) The drive circuit enters its normal mode and requests the control unit to update the screen displayed by the display panel; and (D) the control unit Entering its normal mode, and transmitting the transmitted last video frame of the data stream to the driving circuit and entering its standby mode; and the driving circuit drives the display panel according to the last image frame and enters its Standby mode.

For a better understanding of the features, objects and functions of the present invention, the embodiments of the present invention are described in detail with reference to the drawings. In all of the specification and the drawings, the same component numbers will be used to designate the same or similar components.

In the description of the embodiments of the present invention, an element is described as being "above/on" or "below/under" of another element, either directly or indirectly. In the case of above or below this element, but with other elements set in between. For the convenience and clarity of the description, the thickness or size of each film layer in the drawings is expressed in an exaggerated or omitted or schematic manner, and the dimensions of the respective constituent elements are not completely the actual dimensions.

1 is a block diagram of a display 100 in accordance with a first embodiment of the present invention. The display unit 100 includes a control unit 110, a display unit 120, and an operation interface 130. The display unit 120 can be operated in a normal or standby mode. The display unit 120 includes a driving circuit 121 and a display panel 122. The driving circuit 121 is operable in a normal or standby mode; and the operating interface 130 is connected to the control unit 110 and the driving circuit 121 for providing a video frame data signal from the control unit 110 to the driving circuit 121. And a bidirectional transfer of the picture update control signal between the control unit 110 and the drive circuit 121. In addition, since the present invention is particularly applicable to an embodiment of a display having good picture retention capability, for example, a thin film transistor (TFT) liquid crystal display using indium gallium zinc oxide (IGZO) as an electrode material, or an active matrix organic light emission Diode (AMOLED) display. The constituent elements of the present embodiment will be described in detail below.

In this specification, the standby mode refers to a low power operation mode with respect to the normal mode, and is substantially equivalent to a so-called sleep or power saving mode. In addition, in terms of technical terms in practice, the control unit 110 may be referred to as a system source for providing an image frame data signal in the display 100, and the display unit 120 may be referred to as an image received in the display 100. The sink of the frame data signal. In the prior art, the source of the system usually actively provides an image frame information letter. No., the receiving end only passively accepts the image frame data signal provided by the source of the system; however, this embodiment will enable the receiving end to have an active function for issuing a control signal to the source of the system, for example, a picture update. Request signal to achieve high power saving display screen update technology.

In the embodiment, the control unit 110 and the display unit 120 can transmit a data stream image frame to the driver via the operation interface 130. The circuit 121 enables the driving circuit 121 to drive the display panel 122 according to the order of the image frames of the data stream to update the screen displayed by the display panel 122. On the other hand, after the control unit 110 transmits the data stream, it will enter its standby mode, and the driving circuit 121 drives the data stream and drives the data frame according to the last video frame of the data stream. The display panel 122 is configured such that the display panel 122 displays its picture after the last video frame, and then enters its standby mode.

When the receiving end needs to update the display screen, the driving circuit 121 can transmit a screen update control signal to the control unit 110 via the operation interface 130, thereby requesting to update the screen displayed by the display panel 122. At this time, the control unit 110 will be woken up to enter its normal mode, and the last video frame of the data stream is transmitted to the driving circuit 121, and then enters its standby mode again; and the driving circuit 121 The display panel 122 is driven according to the last image frame, so that the display panel 122 displays its picture with the last image frame, and then enters its standby mode again. Therefore, the long-term standby mode operation can be maintained, so that the maximum power saving efficiency can be achieved.

The drive circuit 121 is displayed on the display panel 122. The update request of the screen can be implemented in the following two ways. The first mode is to set a specific frequency to periodically request to update the picture, and the driving circuit 121 can repeatedly transmit the picture update control signal to the control unit 110 at the specific frequency, for example, a repetition frequency of 1 Hz or higher. In addition, the second method is to determine whether to update the display screen according to the measurement result of the characteristic parameter value of the display panel 122, and then the driving circuit 121 may further detect a specific parameter of the display panel 122. For example, the grayscale value of the screen displayed by the display panel 122, and when the specific parameter satisfies a specific condition, the control signal of the screen update request is transmitted to the control unit 110; for example, the specific condition may be the grayscale of the screen. When the value has been reduced by 20% or more by the display panel 122 according to the last image frame and displayed on the display panel 122 by the gray level value, the control unit 110 is requested to provide a new or original image. The frame data signal is sent to the display unit 120; however, the invention is not limited thereto.

In addition, if the source or receiver of the system finds or confirms that the image frame to be displayed does not change or changes very little, then when the image frame of the data stream has not been completely transmitted, received, or displayed, Both the control unit 110 and the drive circuit 121 can make a request to enter the standby mode and obtain a handshake confirmation of each other, and enter their standby modes, respectively. The control unit 110 or the driving circuit 121 can detect the data stream and compare a specific number of successive adjacent video frames, for example, five consecutive adjacent video frames; when the specific number of successive phases When the neighboring image frame satisfies a specific condition, the control unit 110 or the driving circuit 121 can make a request to enter the standby mode, and if the control unit 110 and the driving circuit 121 can obtain mutual handshake confirmation, The control unit 110 can enter its In the standby mode, the driving circuit 121 drives the display panel 122 according to the received last image frame, so that the display panel 122 displays the picture in the last image frame, and then enters its standby mode. In this embodiment, the specific condition may be set to a grayscale variation value of the specific number of consecutive adjacent video frames of less than 20%, but the invention is not limited thereto.

In this embodiment, the driving circuit 121 can transmit a control signal of a screen update request to the control unit 110 via the operation interface 130, thereby requesting to update the screen displayed by the display panel 122, and then the control unit 110 enters its normal state. And transmitting the last video frame of the data stream to the driving circuit 121, and then entering the standby mode; and the driving circuit 121 drives the display panel 122 according to the last image frame, so that the The display panel displays its picture with the last video frame, and then enters its standby mode. In addition, the embodiment is also applicable to the case where the image frame of the data stream has been completely transmitted, received, or displayed. This may be omitted as described above.

From the first embodiment described above, the technique for updating the display screen used for the display can be derived and will be described in detail below. 2 is a schematic flow chart of a display screen updating method 200 according to a second embodiment of the present invention, and each step will be described in detail below.

In step 210, a display can be provided that includes a control unit and a display unit having a drive circuit and a display panel. The control unit can have two operating modes, normal and standby, and the driving circuit can also have two operating modes: normal and standby. At this time, the display is in a normal normal working state; in other words, the control unit (system source) and the drive The moving circuits (receiving ends) operate in their normal modes, respectively.

In the following step 220, the control unit transmits an image frame of the data stream to the driving circuit, and the driving circuit drives the display panel according to the sequence of the image frames of the data stream to update the display panel. a display screen, wherein the control unit or the driving circuit detects the data stream and compares a specific number of successive adjacent image frames, when the specific number of successive adjacent image frames meet a specific condition, The control unit and the driving circuit can obtain the handshake confirmation, and the control unit enters its standby mode, and the driving circuit drives the display panel according to the received last image frame, so that the display panel uses the last image. The box displays its picture and then enters its standby mode.

When the receiving end needs to update the display screen, the next step 230 causes the driving circuit to enter its normal mode, and requests the control unit to update the screen displayed by the display panel. For example, the driving circuit can transmit a control signal of a picture update request to the control unit to request to update the picture displayed by the display panel. Regarding the above-mentioned update request of the drive circuit for the screen displayed on the display panel, the embodiment can be implemented in the following two ways. The first way is to set a specific frequency to periodically request to update the picture, and the driving circuit can repeatedly transmit the picture update control signal to the control unit at the specific frequency, for example, a repetition frequency of 1 Hz or higher. In addition, the second method is a request for determining whether to update the display screen according to the measurement result of the characteristic parameter value of the display panel, so that the driving circuit can further detect a specific parameter of the display panel, for example, the Displaying a grayscale value of the screen displayed by the panel, and transmitting a control signal of the screen update request to the control unit when the specific parameter satisfies a specific condition; for example, The specific condition may be that the control unit provides a new one when the grayscale value of the screen has been reduced by 20% or more by the first screen grayscale value displayed on the display panel by the display panel according to the last image frame. The original or original image frame data signal is given to the display unit, but the invention is not limited thereto.

At this point, the control unit will be able to wake up, then the next step 240 is: the control unit enters its normal mode, and transmits the last video frame of the data stream to the driving circuit, and enters its standby mode; The driving circuit drives the display panel according to the last image frame, so that the display panel displays the picture in the last image frame, and then enters its standby mode again. Therefore, the long-term standby mode operation can be maintained, so that the maximum power saving efficiency can be achieved.

In addition, if the source or receiver of the system finds or confirms that the image frame to be displayed does not change or changes very little, then when the image frame of the data stream has not been completely transmitted, received, or displayed, Both the control unit and the drive circuit can make a request to enter the standby mode and obtain a handshake confirmation of each other, and enter their standby mode respectively. Accordingly, FIG. 3 is a schematic flowchart of a display screen updating method 300 according to a third embodiment of the present invention, and each step will be described in detail below.

In step 310, a display can be provided, which includes a control unit and a display unit having a driving circuit and a display panel. The control unit can have two operating modes, normal and standby, and the driving circuit can also have two operating modes: normal and standby. At this time, the display is in a normal normal working state; in other words, the control unit (system source) and the drive circuit (receiver) operate in their normal modes, respectively.

In the next step 320, the control unit transmits an image of the data stream The frame is given to the driving circuit, and the driving circuit drives the display panel according to the order of the image frames of the data stream to update the screen displayed by the display panel; wherein the control unit or the driving circuit can detect Detecting the data stream and comparing a specific number of successive adjacent image frames. When the specific number of successive adjacent image frames meets a specific condition, if the control unit and the driving circuit can obtain a handshake confirmation, the The control unit enters its standby mode, and the driving circuit drives the display panel according to the received last image frame, so that the display panel displays its picture with the last image frame, and then enters its standby mode.

In this embodiment, the control unit or the driving circuit can detect the data stream and compare a specific number of successive adjacent video frames, for example, five consecutive adjacent video frames; when the specific number of successive frames When the adjacent image frame satisfies a specific condition, the control unit or the driving circuit may make a request to enter a standby mode, and if the control unit and the driving circuit can obtain mutual handshake confirmation, the control unit The display circuit can be driven in accordance with the last image frame received, so that the display panel displays the picture in the last image frame, and then enters its standby mode. In this embodiment, the specific condition may be set to a grayscale variation value of the specific number of consecutive adjacent video frames of less than 20%, but the invention is not limited thereto.

When the receiving end needs to update the display screen, the next step 330 causes the driving circuit to enter its normal mode, and requests the control unit to update the screen displayed by the display panel. Then, when the control unit is woken up, proceeding to step 340, the control unit enters its normal mode, and transmits the transmitted last video frame of the data stream to the driving circuit, and enters its waiting mode. And the driving circuit drives the display panel according to the last image frame, so that the display panel displays the picture in the last image frame, and then enters the standby mode again. In addition, the embodiment is also applicable to the case where the image frame of the data stream has been completely transmitted, received, or displayed. This is as described in the second embodiment, and details are not described herein again.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. It is to be understood that the scope of the present invention is not limited by the spirit and scope of the present invention, and should be considered as a further embodiment of the present invention.

100‧‧‧ display

110‧‧‧Control unit

120‧‧‧Display unit

121‧‧‧Drive circuit

122‧‧‧ display panel

130‧‧‧Operator interface

200/300‧‧‧ Display screen update method

210/220/230/240‧‧‧Steps

310/320/330/340‧‧‧Steps

1 is a block diagram of a display in accordance with a first embodiment of the present invention.

2 is a flow chart showing a method for updating a display screen according to a second embodiment of the present invention.

FIG. 3 is a flow chart showing a method for updating a display screen according to a third embodiment of the present invention.

100‧‧‧ display

110‧‧‧Control unit

120‧‧‧Display unit

121‧‧‧Drive circuit

122‧‧‧ display panel

130‧‧‧Operator interface

Claims (14)

A display device comprising: a control unit having at least two operating modes: normal and standby; a display unit comprising a driving circuit and a display panel, the driving circuit having at least two operating modes, normal and standby; and an operation interface Connecting the control unit and the driving circuit for providing unidirectional transmission of the image frame data signal from the control unit to the driving circuit, and bidirectional transmission of the picture update control signal between the control unit and the driving circuit; The control unit transmits image frames of a data stream to the driving circuit via the operation interface, and the driving circuit drives the display according to the sequence of the image frames of the data stream. a panel to update the screen displayed by the display panel; the control unit then enters the standby mode after transmitting the data stream, and the driving circuit receives the data stream and the last image frame according to the data stream Driving the display panel and entering its standby mode; the driving circuit transmits a picture through the operation interface Controlling the signal to the control unit, thereby requesting to update the screen displayed by the display panel, the control unit enters its normal mode and transmits the last image frame of the data stream to the driving circuit, and then enters its standby mode; The driving circuit drives the display panel according to the last image frame and enters its standby mode. The display of claim 1, wherein the driving circuit repeatedly transmits the picture update control signal to the control unit at a specific frequency. The display of claim 1, wherein the driving power The circuit may further detect a specific parameter of the display panel, and transmit the picture update control signal to the control unit when the specific parameter satisfies a first specific condition. The display of claim 3, wherein the specific parameter is a grayscale value of the screen displayed by the display panel, and the first specific condition is that the grayscale value of the screen has been determined by the display panel according to the last image. The frame is displayed on the display panel with an initial grayscale value reduced by at least 20%. A display device comprising: a control unit having at least two operating modes: normal and standby; a display unit comprising a driving circuit and a display panel, the driving circuit having at least two operating modes, normal and standby; and an operation interface Connecting the control unit and the driving circuit for providing unidirectional transmission of the image frame data signal from the control unit to the driving circuit, and bidirectional transmission of the picture update control signal between the control unit and the driving circuit; The control unit transmits image frames of a data stream to the driving circuit via the operation interface, and the driving circuit drives the display according to the sequence of the image frames of the data stream. a panel for updating a screen displayed by the display panel; wherein the control unit or the driving circuit can detect the data stream and compare a specific number of successive adjacent image frames, when the specific number of successive adjacent images When the frame satisfies a second specific condition, if the control unit and the drive circuit can obtain a handshake confirmation, the control Element enters its standby mode, and the driving circuit according to the received image information of the last frame to drive the display panel, and into its standby mode; the drive The moving circuit transmits a picture update control signal to the control unit via the operation interface, so as to request to update the picture displayed by the display panel, the control unit enters its normal mode and transmits the transmitted last video message of the data stream. The frame is given to the driving circuit, and then enters its standby mode; and the driving circuit drives the display panel according to the last image frame and enters its standby mode. The display of claim 5, wherein the specific number is 5, and the second specific condition is that the grayscale variation value of the specific number of adjacent adjacent image frames is less than 20%. The display of claim 5, wherein the drive circuit repeatedly transmits the picture update control signal to the control unit at a specific frequency. The display device of claim 5, wherein the driving circuit further detects a specific parameter of the display panel, and transmits the picture update control signal to the specific parameter when the specific parameter satisfies a third specific condition control unit. The display of claim 8, wherein the specific parameter is a grayscale value of the screen displayed by the display panel according to the received last image frame, and the third specific condition is the grayscale of the screen. The value has been reduced by at least 20% by the display panel according to the initial picture grayscale value displayed on the display panel according to the last image frame. A method for updating a display screen, comprising the steps of: (A) providing a display comprising a control unit and a display unit having a driving circuit and a display panel, the control unit having at least two operating modes, normal and standby, The driving circuit has at least two operating modes, normal and standby, and the control unit and the driving circuit respectively operate In the normal mode; (B) the control unit transmits an image frame of the data stream to the driving circuit, and the driving circuit drives the display panel according to the order of the image frames of the data stream to update a screen displayed by the display panel; wherein, when the data stream is transmitted, the control unit enters a standby mode; when the data stream is received, the driving circuit is configured according to the last image frame of the data stream Driving the display unit and entering its standby mode; (C) the drive circuit enters its normal mode, and requests the control unit to update the screen displayed by the display panel; and (D) the control unit enters its normal mode and transmits The last video frame of the data stream is sent to the driving circuit and enters its standby mode; and the driving circuit drives the display panel according to the last image frame and enters its standby mode; wherein, in step (C) The method further includes the step (C0): the driving circuit detects a specific parameter of the display panel, and when the specific parameter meets a specific condition, the method performs the step Step (C); wherein the specific parameter is a grayscale value of the screen displayed by the display panel according to the last image frame, and the specific condition is that the grayscale value of the screen has been determined by the display panel according to the last image frame. The initial screen grayscale value displayed on the display panel is reduced by at least 20%. The method for updating a display screen according to claim 10, wherein the step (C) comprises: the driving circuit transmitting a request signal to the control unit to request to update the screen displayed by the display panel. A method for updating a display screen, comprising the steps of: (A) providing a display comprising a control unit and a drive circuit And a display unit of the display panel, the control unit has two operating modes, normal and standby, the driving circuit has two operating modes, normal and standby, and the control unit and the driving circuit respectively operate in their normal mode; (B) The control unit transmits a video frame of the data stream to the driving circuit, and the driving circuit drives the display panel according to the sequence of the image frames of the data stream to update the screen displayed by the display panel; The control unit or the driving circuit detects the data stream and compares a specific number of successive adjacent image frames. When the specific number of successive adjacent image frames meets a specific condition, if the control unit and the driving The circuit can obtain the handshake confirmation, and the control unit enters its standby mode, and the driving circuit drives the display panel according to the received last image frame and enters its standby mode; (C) the driving circuit enters its normal state Mode, and requesting the control unit to update the screen displayed by the display panel; and (D) the control unit enters its normal mode and transmits The last video frame of the data stream is sent to the driving circuit and enters its standby mode; and the driving circuit drives the display panel according to the last image frame and enters its standby mode: wherein, the step ( C) and (D) are repeatedly executed according to a specific frequency. The method for updating a display screen according to claim 12, wherein in the step (B), the specific quantity is 5, and the specific condition is a gray scale variation value of the specific number of adjacent adjacent video frames. Less than 20%. The method for updating a display screen according to claim 12, wherein the step (C) comprises: the driving circuit transmitting a request signal to the control unit to request to update the screen displayed by the display panel.