CN111433840A - Display device and display driving method - Google Patents
Display device and display driving method Download PDFInfo
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- CN111433840A CN111433840A CN201780097417.6A CN201780097417A CN111433840A CN 111433840 A CN111433840 A CN 111433840A CN 201780097417 A CN201780097417 A CN 201780097417A CN 111433840 A CN111433840 A CN 111433840A
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes 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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
A display device (100) and a display driving method are provided, which can reduce power consumption while maintaining or improving the quality of a display screen. The display device (100) comprises a driving circuit (1), a plurality of light emitting display devices (2) arranged in an array and a processing unit (3), wherein the driving circuit (1) comprises a plurality of driving units (11), each driving unit (11) corresponds to one light emitting display device (2), each driving unit (11) comprises a display driving subunit (12) and an adjusting subunit (13), the processing unit (3) is connected with the plurality of driving units (11), for applying corresponding driving signals to the corresponding display driving subunits (12) according to the display data of the current display picture, so as to drive the corresponding light-emitting display device (2) to emit light through the corresponding display driving subunit (12), and the processing unit (3) is further used for controlling the corresponding adjusting subunit (13) to adjust the light emission of the light-emitting display device (2) according to the display parameters of the display picture.
Description
The present invention relates to a display technology, and more particularly, to a display device and a display driving method.
The screen power consumption of the existing electronic devices such as mobile phones and tablet computers generally accounts for 60% -70% of the power consumption of the whole device, and the backlight power consumption accounts for 70% -80% of the power consumption of the whole screen inside the screen. With the development of light and thin electronic devices such as mobile phones, the capacity of a built-in battery is also smaller, and how to save power on a screen and improve the cruising ability of the electronic device is a consistent target in the industry.
The current mainstream display screens include TFT-L CD screens, AMO L ED (Active Matrix/Organic L light Emitting Diode) screens, etc., and the AMO L ED screens have better display effect and are more and more widely applied.
At present, the conventional method for saving power of the AMO L ED screen is to control the current of the light emitting diode by adjusting the Gamma (Gamma) voltage of the pixel electrode to achieve the purpose of saving power, but because the brightness change of the display screen needs to meet the characteristics of human eye Gamma 2.2, the brightness of all gray scales can be integrally controlled to be increased or decreased only by the feedback of the display brightness of the whole display picture when the Gamma voltage of the pixel electrode is adjusted, although the power saving effect can be realized, the quality of the display picture of the display screen is greatly reduced.
Disclosure of Invention
The embodiment of the invention discloses a display device and a display driving method, which can effectively reduce the power consumption of a display screen and maintain the display quality of a display picture.
The embodiment of the invention discloses a display device, which comprises a driving circuit, a plurality of light-emitting display devices arranged in an array manner and a processing unit, wherein the driving circuit comprises a plurality of driving units, each driving unit corresponds to one light-emitting display device, each driving unit comprises a display driving subunit and an adjusting subunit, the processing unit is connected with the plurality of driving units and is used for applying corresponding driving signals to the corresponding display driving subunits according to display data of a current display picture so as to drive the corresponding light-emitting display devices to emit light through the corresponding display driving subunits, and the processing unit is used for controlling the corresponding adjusting subunits to adjust the light emission of the light-emitting display devices according to display parameters of the display picture.
The embodiment also discloses a display driving method, which is applied to a display device, wherein the display device comprises a plurality of light emitting display devices arranged in an array and a plurality of driving units, each driving unit corresponds to one light emitting display device, and each driving unit comprises a display driving subunit and an adjusting subunit; the display driving method includes the steps of: applying a corresponding driving signal to a corresponding display driving subunit according to the display data of the current display picture so as to drive the corresponding light-emitting display device to emit light through the corresponding display driving subunit; and applying corresponding adjusting signals to the corresponding adjusting subunits according to the display parameters of the display picture so as to control the corresponding adjusting subunits to adjust the light emission of the corresponding light-emitting display devices.
The display device and the display method of the invention drive the light-emitting display device of the display device to emit light through the driving signal to display the display picture, and adjust the light emission of the light-emitting display device of the display device according to the display parameters of the display picture, thereby improving or maintaining the display quality of the display picture and reducing the energy consumption of the light-emitting display device.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a display device according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a driving unit in a display device according to an embodiment of the invention.
Fig. 3 is a schematic diagram of partitioning a display screen according to an embodiment of the present invention.
FIG. 4 is a schematic diagram illustrating the generation of adjustment signals for each partition of a display screen according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a variation of an adjustment signal for a multi-frame display according to an embodiment of the invention.
Fig. 6 is a block diagram of a processing unit according to an embodiment of the invention.
FIG. 7 is a flowchart illustrating a display driving method according to an embodiment of the invention.
Fig. 8 is a sub-flowchart of step S73 in fig. 7.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a block diagram of a display device 100 according to an embodiment of the invention. As shown in fig. 1, the display apparatus 100 includes a driving circuit 1, a plurality of light emitting display devices 2 arranged in an array, and a processing unit 3. Here, at least one light emitting display device 2 may correspond to one pixel point forming the display apparatus 100, the number of the at least one light emitting display device 2 is determined by the resolution of the display apparatus 100, and only two light emitting display devices 2 are illustrated in fig. 1 as an example.
The driving circuit 1 is electrically connected with the processing unit 3 and the plurality of light emitting display devices 2 arranged in an array, the driving circuit 1 is configured to apply a corresponding driving signal according to display data of a current display image to drive the corresponding light emitting display device 2 to emit light, and the processing unit 3 is configured to control the driving circuit 1 to adjust the light emission of the light emitting display device 2 according to display parameters of the display image.
The driving circuit 1 includes a plurality of driving units 11, the number of the driving units 11 is the same as the number of the light emitting display devices 2, and each driving unit 11 is electrically connected to the corresponding light emitting display device 2 for driving the corresponding light emitting display device 2 to emit light for display. Each driving unit 11 includes a display driving subunit 12 and an adjusting subunit 13, the processing unit 3 is connected to all of the driving units 12, and is configured to apply a corresponding driving signal to the corresponding display driving subunit 12 according to display data of a current display screen, so as to drive the corresponding light-emitting display device 2 to emit light through the corresponding display driving subunit 12, and the processing unit 3 is configured to control the corresponding adjusting subunit 13 to adjust light emission of the corresponding light-emitting display device 2 according to display parameters of the display screen, so that light emission energy consumption can be reduced while display quality of the display screen is not reduced.
In some embodiments, please refer to fig. 2, which is a schematic structural diagram of a driving unit 11. The display driving subunit 12 of each driving unit 11 includes a scan switch T1 and a driving switch T2. The driving switch transistor T2 is electrically connected between a driving power supply Vpos, the scanning switch transistor T1 and the corresponding light emitting display device 2. The scanning switch tube T1 is also electrically connected to the processing unit 3.
The processing unit 3 outputs a scan signal Gn to the corresponding scan switch transistor T1 to control the scan switch transistor T1 to be turned on, and outputs a data signal Dn to the turned-on scan switch transistor T1 to transmit the data signal Dn to the drive switch transistor T2 through the turned-on scan switch transistor T1, so as to control the conduction state and conduction degree of the drive switch transistor T2, that is, the drive switch transistor T2 is turned on at a certain conduction degree, so that the drive power supply Vpos can apply a corresponding drive voltage to the light emitting display device 2 to control the light emitting display device 2 to emit light correspondingly.
As shown in fig. 2, the adjusting subunit 13 includes an adjusting switch T3, the adjusting switch T3 is electrically connected between the driving power Vpos and the corresponding light emitting display device 2, and the processing unit 3 is configured to control and output an adjusting signal En with a corresponding duty ratio to the adjusting subunit 13/adjusting switch T3 according to the display parameters of the display frame to further change the driving voltage provided by the driving power Vpos to the light emitting display device 2, so as to adjust the light emission of the light emitting display device 2.
The display data of the display frame determines the driving signal, that is, determines which light emitting display devices 2 in the light emitting display devices 2 arranged in an array are to be controlled to perform light emitting display and the degree of light emission so that the light emission of the light emitting display devices 2 arranged in an array forms the display frame.
In some embodiments, the display parameter is gray scale information of a current display frame. The gray scale information at least comprises information including gray scale distribution, gray scale-to-brightness calculation color Hue (Hue) and saturation.
The processing unit 3 controls the corresponding adjusting subunit 13 to adjust the light emission of the corresponding light emitting display device 2 according to the gray scale information of the current display frame, and further adjusts the display frame, so that the display quality is not reduced, and the energy consumption is reduced. Further, the processing unit 3 controls and outputs an adjusting signal En with a corresponding duty ratio to the adjusting subunit 13/adjusting switch tube T3 according to the gray scale information of the display frame to further change the driving voltage provided by the driving power Vpos to the light emitting display device 2, so as to adjust the light emission of the light emitting display device 2.
In some embodiments, the processing unit 3 further outputs an initial enable signal E1 to the adjusting switch transistor T3 according to the display data of the display screen, and the initial enable signal is applied to the adjusting switch transistor T3 and the scanning switch transistor T1 of the corresponding driving unit 11 in synchronization with the scanning signal, so that the same driving unit 11 applies the initial enable signal E1 in synchronization with the scanning signal to turn on the adjusting switch transistor T3 in synchronization with the scanning signal, so that the driving power supply Vpos can supply power to the light emitting display device 12.
In this application, the adjusting signal En is a signal which is obtained by converting the initial enable signal E1 and is finally output to the adjusting switch tube T3. In a normal case, the initial enable signal E1 of all the regulating switch tubes T3 is the same.
In some embodiments, the processing unit 3 controls the corresponding adjusting subunit 13 to adjust the light emission of the corresponding light-emitting display device 2 according to the gray scale information of the current display frame, including: counting gray scale information (including gray scale distribution, gray scale-to-brightness calculation of Hue, saturation and other information) of the whole current display picture; determining a PWM (pulse width modulation) gain G1 of the initial enable signal of the adjusting switch tube T3 of each driving unit 11 according to the counted gray scale information, combining the initial enable signal E1 of the adjusting switch tube T3 of each driving unit 11 with the corresponding PWM gain G1 to obtain an adjusting signal En, and applying the adjusting signal En to the corresponding adjusting switch tube T3, thereby adjusting the light emission of the corresponding light emitting display device 2.
In general, the applied initial enable signal E1 is a continuous high level signal, and for the same driving unit 11, the adjusting switch transistor T3 is kept turned on continuously for the duration of the scan signal Gn applied to the scan switch transistor T1, so that the driving power supply Vpos can provide a corresponding voltage to the light emitting display device 2 according to the action of the data signal Dn to control the light emitting display device 2 to emit corresponding light.
In this application, through will for lasting high level signal's initial enable signal E1 combines PWM gain G1 and obtains the regulation signal En of PWM signal form for in the duration of exerting scanning signal Gn to scanning switch tube T1, cut off drive power supply Vpos at the part time to the power supply of luminescent display device 2, thereby energy-conserving effect has been reached, in addition, because PWM gain G1 is for reacing rationally according to grey scale information, can not influence the display effect of corresponding pixel.
Please refer to fig. 3, which is a schematic diagram illustrating an embodiment of partitioning a display screen. In one embodiment, the determining, by the processing unit 3, the PWM gain G1 of the initial enable signal of the regulating switch tube T3 of each driving unit 11 according to the counted gray scale information includes: the processing unit 3 divides the current display picture P1 into a plurality of subareas F1-Fn according to the counted gray scale information of the current display picture; the processing unit 3 determines the PWM gain G1 of each partition and the coordinate value range of each partition, determines the light emitting display devices 2 correspondingly included in each partition according to the coordinate value range of each partition, and then determines the PWM gain G1 of the initial enable signals of the plurality of driving units 11 corresponding to the light emitting display devices 2 in each partition to be the PWM gain G1 of the corresponding partition, thereby obtaining the PWM gain G1 of the initial enable signals of the regulating switch tubes T3 of all the driving units 11.
Referring to fig. 4, combining the initial enable signal E1 of the regulating switch T3 of each driving unit 11 with the corresponding PWM gain G1 to obtain the regulating signal En of the regulating switch T3 of each driving unit 11 includes: the initial enable signal E1 of the adjustment switch tube T3 of the driving unit 11 corresponding to the light emitting display device 2 in each partition is combined with the PWM gain G1 of the corresponding partition to obtain the adjustment signal En of the adjustment switch tube T3 of the driving unit 11 corresponding to the light emitting display device 2 in each partition, thereby obtaining the adjustment signal En of each partition.
Therefore, in the subsequent display process of the display screen, when a driving signal including a scanning signal and a data signal is applied to a certain driving unit 11 to drive the corresponding light emitting display device 2 to perform light emitting display, the processing unit 2 obtains the predetermined adjustment signal En of the partition according to the partition where the light emitting display device 2 is located, and applies the adjustment signal En to the adjustment switch tube T3.
In other embodiments, the adjustment signal En of each partition may not be predetermined, and when a driving signal including a scan signal and a data signal is applied to a certain driving unit 11 to drive the corresponding light emitting display device 2 for light emitting display, the processing unit 2 determines the corresponding PWM gain G1 according to the partition where the light emitting display device 2 is located, and controls to combine the initial enable signal E1 with the PWM gain G1 to obtain the adjustment signal En in the form of a PWM signal, and applies the adjustment signal En to the adjustment switching tube T3 to perform the corresponding light emitting adjustment.
In the present embodiment, the display mode of the display device 100 is a line scan mode, each of the partitions F1 to Fn includes at least one line of pixels, and the coordinate value range of the partition also includes the coordinates of the at least one line of pixels.
In some embodiments, the processor 3 determines the PWM gain G1 of each partition to be determined according to at least the brightness and/or contrast of each partition, wherein the processor 3 determines that the higher the brightness of a certain partition is, the higher the PWM gain G1 is, and determines that the lower the brightness of a certain partition is, the lower the PWM gain G1 is; and/or the processor 3 determines that the higher the contrast of a certain partition is, the higher the PWM gain G1 of the partition is, and determines that the lower the contrast of a certain partition is, the lower the PWM gain G1 of the partition is. That is, the PWM gain G1 is proportional to the brightness and/or contrast of the corresponding partition.
The PWM gain G1 is expressed as a PWM signal, the higher the PWM gain G1 is, the higher the duty ratio of the PWM signal is, and the lower the PWM gain G1 is, the lower the duty ratio of the PWM signal is.
The combination of the initial enable signal E1 and the PWM gain G1 to obtain the adjustment signal En in the form of a PWM signal means that the initial enable signal E1 is multiplied by the PWM gain G1 in the form of the PWM signal to obtain the adjustment signal En in the form of the PWM signal.
Therefore, in the application, the display picture is partitioned, different PWM gains G1 are determined for different partitions, and adjustment signals En of different partitions are obtained, so that the partitions can be subjected to better display adjustment in a targeted manner according to the gray scale information of the partitions, and the effects of enhancing or maintaining the display effect and reducing the energy consumption are achieved.
In another embodiment, the processing unit 3 determining the PWM gain G1 of the initial enable signal of the regulating switch tube T3 of each driving unit 11 according to the counted gray scale information comprises: the processing unit determines the overall brightness and/or contrast of the current display picture according to the counted gray scale information of the current display picture, then determines the overall PWM gain G1 of the current display picture according to the overall brightness and/or contrast of the current display picture, and then determines the PWM gain G1 of the initial enable signal of the regulating switch tube T3 of each driving unit 11 as the overall PWM gain G1.
That is, in another embodiment, the processing unit 3 does not partition each/frame display screen, but determines different PWM gains G1 suitable for the entire display screen according to the display screen gray scale information of different frames.
Similarly, the processor 3 determines the PWM gain G1 of each display frame to be determined according to at least the overall brightness and/or the overall contrast of the display frame, wherein the processor 3 determines that the PWM gain G1 is higher when the brightness of a certain display frame is higher, and determines that the PWM gain G1 is lower when the brightness of a certain display frame is lower; and/or the processor 3 determines that the PWM gain G1 of a certain display screen is higher when the contrast of the display screen is higher, and determines that the PWM gain G1 of the display screen is lower when the contrast of the certain display screen is lower.
Referring to fig. 5, for example, as the middle of the black area decreases, the white area increases, the brightness increases, and the PWM gain G1 also increases in the multi-display screens P1-Pn in fig. 5.
The brightness of each display frame may be an average brightness of the display frame, and the contrast of each display frame may be a contrast obtained by considering gray-scale values of all pixels of the display frame.
In another embodiment, the combining the initial enable signal E1 of the regulating switch transistor T3 of each driving unit 11 with the corresponding PWM gain G1 to obtain the regulating signal En of the regulating switch transistor T3 of each driving unit 11 includes: when displaying the display frame of the current frame, the initial enable signal E1 of the adjusting switch tube T3 of each driving unit 11 is combined with the PWM gain G1 of the display frame to obtain the adjusting signal En of the adjusting switch tube T3 of the driving unit 11 corresponding to each light emitting display device 2.
Therefore, in another embodiment, each display picture is adjusted in a targeted manner, so that different display pictures can be integrally adjusted according to own gray scale information, the overall picture display effect is enhanced, and the energy consumption can be reduced.
Referring back to fig. 2, in detail, the light Emitting display device 2 includes at least one Organic light Emitting Diode (O L ED) D1. the Organic light Emitting Diode D1 includes an anode V + and a cathode V-.
The scan switch tube T1 includes a first control terminal T11, a first conducting terminal T12 and a second conducting terminal T13, the driving switch tube T2 includes a second control terminal T21, a third conducting terminal T22 and a fourth conducting terminal T23, the third conducting terminal T22 and the fourth conducting terminal T23 are respectively electrically connected between the driving power supply Vpos and the anodes of the corresponding organic light emitting diodes D1, and the cathode V-of the organic light emitting diode D1 is grounded; the second conducting terminal T13 of the scan switch tube T1 is connected to the second control terminal T21 of the driving switch tube T2, and the first control terminal T11 and the first conducting terminal T12 of the scan switch tube T1 are connected to the processing unit 3.
The adjusting switch tube T3 includes a third control terminal T31, a fifth conducting terminal T32 and a sixth conducting terminal T33, and the third control terminal T31 of the adjusting switch tube T3 is connected to the processing unit 3 for receiving the adjusting signal En. The fifth conduction terminal T32 is electrically connected to the driving power supply Vpos, and the sixth conduction terminal T33 is connected to the third conduction terminal T22 of the driving switch transistor T2.
When the processing unit 3 determines to apply a driving signal to a certain driving unit 11 according to display data of a display screen to enable the corresponding light emitting display device 2 to perform light emitting display, it controls to output a scan signal to the first control terminal T11 of the scan switch tube T1 of the corresponding driving unit 11 to turn on the scan switch tube T1, and controls to output a data signal to the turned-on scan switch tube T1, and the data signal is applied to the second control terminal T21 of the second switch tube T2 through the turned-on scan switch tube T1 to control the turn-on degree of the second switch tube T2.
Meanwhile, the processor 3 determines an adjustment signal En applied to the adjustment switch transistor T3 according to display parameters such as gray scale information of a display screen, and outputs the adjustment signal En to the third control terminal T31 of the adjustment switch transistor T3, and since the adjustment signal En is a signal in the form of PWM, the dc voltage output by the driving power supply Vpos is converted into a voltage in the form of a switching power supply, so that the voltage supplied to the organic light emitting diode D1 is changed, and the light emission of the organic light emitting diode D1 is adjusted accordingly.
Wherein, as shown in fig. 2, the driving unit 11 further includes a capacitor C1, a capacitor C2 and a reset switch tube T4, two ends of the capacitor C1 are electrically connected between the anode V + of the organic light emitting diode D1 and the control terminal T21 of the driving switch transistor T2, for maintaining the voltage of the driving switch transistor T2 for a period of time after power off, the two ends of the capacitor C2 are connected between the fifth conducting end T32 of the regulating switch transistor T3 and the anode V + of the organic light emitting diode D1, for maintaining the voltage of the driving power supply Vpos, the reset switch transistor T4 includes a fourth control terminal T41, a seventh conduction terminal T42 and an eighth conduction terminal T43, the fourth control terminal T41 is for receiving a reset signal, and the seventh conducting terminal T42 and the eighth conducting terminal T43 are respectively connected to the anode V + of the oled D1 and the input terminal Vin. The input terminal Vin may be a ground point. When the fourth control terminal T41 receives a reset signal, the reset switch T4 is turned on, and the positive electrode V + of the organic light emitting diode D1 is grounded, so that the voltage of the organic light emitting diode D1 is zero, and the display reset is performed. The reset signal received by the fourth control terminal T41 may be generated by a user operating a reset button on the display device.
Wherein only one organic light emitting diode D1 is illustrated in fig. 2, it is obvious that in other embodiments, the light emitting display device 2 may comprise a plurality of organic light emitting diodes D1 connected in series or in parallel.
The scan switch transistor T1, the driving switch transistor T2, the adjusting switch transistor T3, and the reset switch transistor T4 may be MOS transistors or BJT transistors. The first control end T11, the second control end T21, the third control end T31 and the third control end T41 correspond to a gate of an MOS transistor or a base of a BJT gate diode, the first conduction end T12, the third conduction end T22, the fifth conduction end T32 and the seventh conduction end T42 correspond to a drain of an MOS transistor or a collector of a BJT triode, and the second conduction end T12, the fourth conduction end T23, the sixth conduction end T33 and the eighth conduction end T43 correspond to a source of an MOS transistor or an emitter of a BJT triode.
Referring back to fig. 1, the display device 100 further includes a memory 4, the memory 4 stores display data of a to-be-displayed picture, and the processing unit 3 obtains the display data of the to-be-displayed picture from the memory 4 and further obtains display parameters of the to-be-displayed picture, that is, the gray scale information as described above through display data analysis.
Referring to fig. 6, in some embodiments, the processing unit 3 may include a display controller 31 and a processor 31.
The display controller 31 is connected to the scan switch T1 of each driving unit 11, and is configured to apply a corresponding driving signal to the corresponding display driving subunit 12 according to the display data of the current display frame, so as to drive the corresponding light-emitting display device 2 to emit light through the corresponding display driving subunit 12.
The processing unit 3 is used for controlling the corresponding adjusting subunit 13 to adjust the light emission of the corresponding light emitting display device 2 according to the display parameters of the display picture
The processor 31 is connected to the adjusting switch T3 in each driving unit 11, and is configured to execute functions of controlling the corresponding adjusting subunit 13 to adjust the light emission of the corresponding light-emitting display device 2 according to the display parameters of the display screen, including the aforementioned functions of determining the PWM gain G1 of the display screen.
In some embodiments, the display controller 31 and the processor 32 are two separate chips.
Obviously, in other embodiments, the processing unit 3 may also be an integrated chip, and have both the functions of the display controller and the aforementioned adjusting function.
The processing unit 3 or the processor 31 may be a central processing unit, a microcontroller, a microprocessor, a single chip, a digital signal processor, or the like.
The memory 4 may be a memory card, a solid-state memory, a micro hard disk, an optical disk, or other computer-readable storage media. In some embodiments, the memory 4 stores program instructions that can be called by the processing unit 3 or the processor 31 to perform the aforementioned functions.
The display device 100 may be an AMO L ED display, a mobile phone including an AMO L ED display screen, a tablet computer, a television, or other electronic devices.
Fig. 7 is a flowchart illustrating a display driving method according to an embodiment of the invention. The display driving method is applied to the display device 100 described above, and the execution sequence is not limited to the sequence shown in fig. 7. As described above, the display apparatus 100 includes a plurality of light emitting display devices 2 arranged in an array, and a driving circuit 1 electrically connected to the plurality of light emitting display devices 2 arranged in an array. The method comprises the following steps:
a corresponding driving signal is applied to the driving circuit 1 according to the display data of the current display picture to drive the corresponding light emitting display device 2 to emit light through the driving circuit 1 (S71). In some embodiments, the driving circuit 1 includes a plurality of driving units 11, each driving unit 11 is electrically connected to a corresponding light emitting display device 2, each driving unit 11 includes a display driving subunit 12 and an adjusting subunit 13, the driving signals applied according to the display data of the current display screen include a scanning signal Gn and a data signal Dn, the display driving subunit 12 includes a scanning switch transistor 1 and a driving switch transistor T2, and the step S71 specifically includes: the scan signal Gn is output to the corresponding scan switch transistor T1 to control the scan switch transistor T1 to be turned on, and the data signal Dn is output to the turned-on scan switch transistor T1 to be transmitted to the driving switch transistor T2 through the turned-on scan switch transistor T1, so as to control the on-state and on-degree of the driving switch transistor T2, so that the driving power supply Vpos can apply a corresponding driving voltage to the light emitting display device 2 to control the light emitting display device 2 to emit light correspondingly.
Applying a corresponding adjustment signal to the driving circuit 1 according to the display parameter of the display picture to control the driving circuit 1 to adjust the light emission of the corresponding light emitting display device 2 (S73). The adjusting subunit 13 includes an adjusting switch tube T3, the adjusting switch tube T3 is electrically connected between the driving power supply Vpos and the corresponding light emitting display device 2, the display parameters include gray scale information, and the step S73 specifically includes: the processing unit 3 controls the corresponding adjusting subunit 13/adjusting switch tube T3 to adjust the light emission of the corresponding light emitting display device 2 according to the gray scale information of the current display frame, and further adjusts the display frame, so as to save energy consumption without reducing display quality. Furthermore, the processing unit 3 controls and outputs an adjustment signal En with a corresponding duty ratio to the adjustment subunit 13 according to the gray scale information of the display frame to further change the driving voltage provided by the driving power Vpos to the light emitting display device 2 so as to adjust the light emission of the light emitting display device 2.
Please refer to fig. 8, which is a sub-flowchart of step S73 in fig. 7 according to an embodiment. When the driving circuit 1 includes a plurality of driving units 11, each driving unit 11 is electrically connected to a corresponding light emitting display device 2, each driving unit 11 includes a display driving subunit 12 and an adjustment subunit 13, and each adjustment subunit 13 includes an adjustment switch tube T3, as shown in fig. 8, the step S73 includes the following steps.
The gray scale information of the whole current display frame is counted (S730). The gray scale information comprises gray scale distribution, gray scale-to-brightness calculation color Hue, saturation and other information.
Determining a PWM (pulse width modulation) gain G1 of an initial enable signal of the regulating switch tube T3 of each driving unit 11 according to the counted gray scale information (S732);
the initial enable signal E1 of the regulating switch transistor T3 of each driving unit 11 is combined with the corresponding PWM gain G1 to obtain the regulating signal En (S734). The PWM gain G1 is expressed in the form of a PWM signal, and the combining of the PWM gain G1 of the regulating switch T3 of each driving unit 11 with the corresponding initial enable signal E1 to obtain the regulating signal En includes: the initial enable signal E1 is multiplied by the PWM gain G1 in the form of the PWM signal to obtain the adjustment signal En in the form of the PWM signal.
And applies the adjustment signal En to the corresponding adjustment switch tube T3 to adjust the light emission of the corresponding light emitting display device 2 (S736).
In some embodiments, the step S732 further specifically includes: partitioning the current picture according to the counted gray scale information of the current display picture to obtain a plurality of partitions F1-Fn; determining a PWM gain G1 of each partition and a coordinate value range of each partition; and determining the light emitting display devices 2 correspondingly included in the respective sub-areas according to the coordinate value range of each sub-area, and then determining the PWM gain G1 of the initial enable signal of the plurality of driving units 11 corresponding to the light emitting display devices 2 in each sub-area to be the PWM gain G1 of the corresponding sub-area, thereby obtaining the PWM gain G1 of the initial enable signal of the regulating switch tube T3 of all the driving units 11.
In some embodiments, the step S734 further specifically includes: the initial enable signal E1 of the adjustment switch transistor T3 of the driving unit 11 corresponding to the light emitting display device 2 in each partition is combined with the PWM gain G1 of the corresponding partition to obtain the adjustment signal En of the adjustment switch transistor T3 of the driving unit 11 corresponding to the light emitting display device 2 in each partition. That is, the adjustment signals En of the adjustment switch tubes T3 of the driving units 11 corresponding to the light emitting display devices 2 in the same division are the same.
Wherein the determining the PWM gain G1 for each partition comprises: the determination is performed according to at least the brightness and/or the contrast of each partition, wherein the processor 3 determines that the PWM gain G1 is higher when the brightness of a certain partition is higher, and determines that the PWM gain G1 is lower when the brightness of a certain partition is lower; and/or the processor 3 determines that the higher the contrast of a certain partition is, the higher the PWM gain G1 of the partition is, and determines that the lower the contrast of a certain partition is, the lower the PWM gain G1 of the partition is.
In other embodiments, the step S732 specifically includes: the counted gray scale information of the current display screen determines the overall brightness and/or contrast of the current display screen, then determines the overall PWM gain G1 of the current display screen according to the overall brightness and/or contrast of the current display screen, and then determines the PWM gain G1 of the initial enable signal of the regulating switch tube T3 of each driving unit 11 as the overall PWM gain G1.
The PWM gain G1 is determined to be higher when the brightness of a certain display picture is higher, and the PWM gain G1 is determined to be lower when the brightness of a certain display picture is lower; and/or determining that the PWM gain G1 of a certain display screen is higher when the contrast of the certain display screen is higher, and determining that the PWM gain G1 of the certain display screen is lower when the contrast of the certain display screen is lower.
When the memory 4 stores program instructions, the program instructions are used for the processing unit 3 or the processor 32 to call and execute to perform steps of any one of the aforementioned methods.
Therefore, the display apparatus 100 and the display driving method according to the present invention adjust the light emission of the light emitting display device 2 according to the display parameters of the display screen in addition to the conventional light emitting display device 2 driven according to the display data for performing the light emission display, so that the power consumption of the light emitting display device 2 can be saved while maintaining or improving the display quality of the display screen, the power consumption of the light emitting display device 2 as the main energy consumption element is reduced, and the cruising ability of the display apparatus 100 is greatly improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (20)
- The display device is characterized by comprising a driving circuit, a plurality of light-emitting display devices arranged in an array and a processing unit, wherein the driving circuit is electrically connected with the plurality of light-emitting display devices arranged in the array and the processing unit and is used for applying corresponding driving signals according to display data of a current display picture so as to drive the corresponding light-emitting display devices to emit light, and the processing unit is used for controlling the driving circuit to adjust the light emission of the light-emitting display devices according to display parameters of the display picture.
- The display apparatus according to claim 1, wherein the driving circuit comprises a plurality of driving units, each driving unit corresponds to a light emitting display device, each driving unit comprises a display driving subunit and an adjustment subunit, the processing unit is connected to the plurality of driving units and configured to apply a corresponding driving signal to the corresponding display driving subunit according to the display data of the current display frame so as to drive the corresponding light emitting display device to emit light through the corresponding display driving subunit, and the processing unit is configured to control the corresponding adjustment subunit to adjust the light emission of the light emitting display device according to the display parameters of the display frame.
- The display apparatus according to claim 2, wherein the display driving subunit of each driving unit comprises a scan switch tube and a driving switch tube, the driving switch tube is electrically connected between a driving power supply, the scan switch tube and the corresponding light emitting display device, the scan switch tube is further electrically connected with the processing unit, and the adjusting subunit comprises an adjusting switch tube, the adjusting switch tube is electrically connected between the driving power supply and the corresponding light emitting display device.
- The display apparatus as claimed in claim 3, wherein the display parameter is gray scale information of a current display frame, the gray scale information at least includes information of gray scale distribution, gray scale to luminance calculation color hue, saturation, and the processing unit controls the corresponding adjusting sub-unit to adjust the light emission of the corresponding light emitting display device according to the gray scale information of the current display frame, so as to further adjust the display frame.
- The display device as claimed in claim 4, wherein the processing unit controls to output an adjustment signal with a corresponding duty ratio to the adjustment subunit according to gray scale information of the display screen to further change the driving voltage provided by the driving power supply to the light emitting display device to adjust the light emission of the light emitting display device.
- The display apparatus according to claim 4, wherein the processing unit controls the corresponding adjusting subunit to adjust the light emission of the corresponding light emitting display device according to the gray scale information of the current display frame, comprising: the processing unit counts gray scale information of the whole current display picture; and determining the PWM gain of the initial enabling signal of the adjusting switch tube of each driving unit according to the counted gray scale information, combining the initial enabling signal of the adjusting switch tube of each driving unit with the corresponding PWM gain, and applying the adjusting signal to the corresponding adjusting switch tube so as to adjust the light emission of the corresponding light-emitting display device.
- The display device as claimed in claim 6, wherein the processing unit determining the PWM gain of the initial enable signal of the regulating switching tube of each driving unit according to the counted gray scale information comprises: the processing unit divides the current picture into a plurality of subareas according to the counted gray scale information of the current display picture; the processing unit determines the PWM gain of each partition and the coordinate value range of each partition, determines the light-emitting display devices correspondingly included in each partition according to the coordinate value range of each partition, and then determines the PWM gain of the initial enable signals of the adjusting switch tubes of the plurality of driving units corresponding to the light-emitting display devices in each partition to be the PWM gain of the corresponding partition, so that the PWM gain of the initial enable signals of the adjusting switch tubes of all the driving units is obtained.
- The display device as claimed in claim 7, wherein the processing unit combines the initial enable signal of the regulating switch tube of each driving unit with the corresponding PWM gain to obtain the regulating signal, and comprises: and the processing unit combines the initial enabling signal of the adjusting switch tube of the driving unit corresponding to the light-emitting display device in each subarea with the PWM gain of the corresponding subarea to obtain the adjusting signal of the adjusting switch tube of the driving unit corresponding to the light-emitting display device in each subarea.
- The display device according to claim 7, wherein the processing unit partitions the display screen according to at least a brightness and/or a contrast of the display screen, and determines the PWM gain for each partition according to at least the brightness and/or the contrast of the respective partition.
- The display device as claimed in claim 6, wherein the processing unit determines the PWM gain of the initial enable signal of the regulating switch tube of each driving unit according to the counted gray scale information, comprising: the processing unit determines the overall brightness and/or contrast of the current display picture according to the counted gray scale information of the current display picture, then determines the overall PWM gain of the current display picture according to the overall brightness and/or contrast of the current display picture, and then determines the PWM gain of the initial enable signal of the adjusting switch tube of each driving unit as the overall PWM gain.
- The display device as claimed in claim 10, wherein the processing unit combines the initial enable signal of the regulating switch tube of each driving unit with the corresponding PWM gain to obtain the regulating signal, and comprises: and when the processing unit displays the current display picture, combining the initial enabling signal of the adjusting switch tube of each driving unit with the PWM gain of the display picture to obtain the adjusting signal of each adjusting switch tube.
- A display driving method is applied to a display device, and is characterized in that the display device comprises a plurality of luminous display devices arranged in an array and a driving circuit; the display driving method includes the steps of:applying a corresponding driving signal to a driving circuit according to display data of a current display picture so as to drive a corresponding light-emitting display device to emit light through the driving circuit; andand applying a corresponding adjusting signal to the driving circuit according to the display parameters of the display picture so as to control the driving circuit to adjust the light emission of the corresponding light-emitting display device.
- The display driving method of claim 12, wherein the driving circuit comprises a plurality of driving units, each driving unit corresponding to a light emitting display device, each driving unit comprising a display driving subunit and an adjusting subunit; the display parameters are gray scale information of a current display picture, the gray scale information at least comprises information including gray scale distribution, gray scale-to-brightness calculation color hue and saturation, and the step of applying corresponding adjusting signals to the driving circuit according to the display parameters of the display picture comprises the following steps of: and applying corresponding adjusting signals to the corresponding adjusting subunits according to the gray scale information of the display picture so as to control the corresponding adjusting subunits to adjust the light emission of the corresponding light emitting display device.
- The method as claimed in claim 13, wherein each of the adjusting sub-units comprises an adjusting switch, and the step of applying a corresponding adjusting signal to the corresponding adjusting sub-unit according to the gray scale information of the display frame to control the corresponding adjusting sub-unit to adjust the light emission of the corresponding light emitting display device comprises:counting gray scale information of the whole current display picture;determining the PWM gain of the initial enabling signal of the adjusting switch tube of each driving unit according to the counted gray scale information;combining the initial enabling signals of the adjusting switch tubes of each driving unit with the corresponding PWM gains to obtain adjusting signals; andand applying the adjusting signal to the corresponding adjusting switch tube so as to adjust the light emission of the corresponding light-emitting display device.
- The display driving method according to claim 14, wherein the step of determining the PWM gain of the initial enable signal of the regulating switching tube of each driving unit according to the counted gray scale information comprises:partitioning the current picture according to the counted gray scale information of the current display picture to obtain a plurality of partitions;determining the PWM gain of each partition and the coordinate value range of each partition, determining the light-emitting display devices correspondingly included in each partition according to the coordinate value range of each partition, and then determining the PWM gain of the initial enable signals of the adjusting switch tubes of the plurality of driving units corresponding to the light-emitting display devices in each partition as the PWM gain of the corresponding partition, thereby obtaining the PWM gain of the initial enable signals of the adjusting switch tubes of all the driving units.
- The display driving method according to claim 15, wherein the step of combining the initial enable signal of the regulating switch tube of each driving unit with the corresponding PWM gain to obtain the regulating signal comprises:and combining the initial enabling signals of the adjusting switch tubes of the driving units corresponding to the light-emitting display devices in each subarea with the PWM gains of the corresponding subareas to obtain adjusting signals of the adjusting switch tubes of the driving units corresponding to the light-emitting display devices in each subarea.
- The display driving method according to claim 16, wherein the step of dividing the current frame into a plurality of sections according to the counted gray scale information of the current display frame comprises: partitioning the display picture at least according to the brightness and/or contrast of the display picture;the step of determining the PWM gain of each section includes: the PWM gain for each partition is determined based at least on the brightness and/or contrast of the respective partition.
- The display driving method according to claim 15, wherein the step of determining the PWM gain of the initial enable signal of the regulating switching tube of each driving unit according to the counted gray scale information comprises:determining the overall brightness and/or contrast of the current display picture according to the counted gray scale information of the current display picture;and determining the integral PWM gain of the current display picture according to the integral brightness and/or contrast of the current display picture, and then determining the PWM gain of the initial enable signal of the adjusting switch tube of each driving unit as the integral PWM gain.
- The display driving method according to claim 18, wherein the step of combining the initial enable signal of the regulating switch tube of each driving unit with the corresponding PWM gain to obtain the regulating signal comprises:when the current display picture is displayed, the initial enabling signal of the adjusting switch tube of each driving unit is combined with the PWM gain of the display picture to obtain the adjusting signal of each adjusting switch tube.
- The display driving method according to claim 19, wherein the adjusting switch tube is electrically connected between the driving power supply and the corresponding light emitting display device, and the step of applying a corresponding adjusting signal to the corresponding adjusting subunit according to gray scale information of the display screen to control the corresponding adjusting subunit to adjust the light emission of the corresponding light emitting display device comprises:and controlling and outputting an adjusting signal with a corresponding duty ratio to the adjusting subunit according to the display parameters of the display picture, so as to further change the driving voltage provided by the driving power supply to the light-emitting display device and adjust the light emission of the light-emitting display device.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/115884 WO2019113823A1 (en) | 2017-12-13 | 2017-12-13 | Display device and display driving method |
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| CN111433840A true CN111433840A (en) | 2020-07-17 |
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| CN1522382A (en) * | 2001-07-03 | 2004-08-18 | ���ǵ�����ʽ���� | Apparatus for supplying power and liquid crsytal display having the same |
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| CN105047142A (en) * | 2015-09-01 | 2015-11-11 | 青岛海信电器股份有限公司 | Liquid crystal display brightness control method and device and liquid crystal display equipment |
| CN107068059A (en) * | 2017-05-27 | 2017-08-18 | 北京大学深圳研究生院 | Pixel arrangement, the method and display device for driving pixel arrangement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5288579B2 (en) * | 2006-12-13 | 2013-09-11 | ルネサスエレクトロニクス株式会社 | Display device and controller driver |
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- 2017-12-13 WO PCT/CN2017/115884 patent/WO2019113823A1/en active Application Filing
- 2017-12-13 CN CN201780097417.6A patent/CN111433840A/en active Pending
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|---|---|---|---|---|
| US6316974B1 (en) * | 2000-08-26 | 2001-11-13 | Rgb Systems, Inc. | Method and apparatus for vertically locking input and output signals |
| CN1522382A (en) * | 2001-07-03 | 2004-08-18 | ���ǵ�����ʽ���� | Apparatus for supplying power and liquid crsytal display having the same |
| CN101978415A (en) * | 2008-03-19 | 2011-02-16 | 全球Oled科技有限责任公司 | Oled display panel with PWM control |
| CN105047142A (en) * | 2015-09-01 | 2015-11-11 | 青岛海信电器股份有限公司 | Liquid crystal display brightness control method and device and liquid crystal display equipment |
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