CN117153111A - Display driving method and related device - Google Patents

Display driving method and related device Download PDF

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Publication number
CN117153111A
CN117153111A CN202311011929.XA CN202311011929A CN117153111A CN 117153111 A CN117153111 A CN 117153111A CN 202311011929 A CN202311011929 A CN 202311011929A CN 117153111 A CN117153111 A CN 117153111A
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CN
China
Prior art keywords
data
pulse
sub
width modulation
modulation signal
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CN202311011929.XA
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Chinese (zh)
Inventor
史兴萍
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Chipone Technology Beijing Co Ltd
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Chipone Technology Beijing Co Ltd
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Priority to CN202311011929.XA priority Critical patent/CN117153111A/en
Publication of CN117153111A publication Critical patent/CN117153111A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • 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]
    • G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Abstract

The present disclosure provides a display driving method and related apparatus. The display driving method includes: receiving a pulse width modulation signal sent by a light source driver; adjusting the light emitting duration of at least one pulse of the pulse width modulation signal in a frame period according to the adjustment data; and sending the regulated pulse width modulation signal to a light-emitting switch to drive a light source to emit light, wherein the regulation data is determined based on the screen display brightness caused by the light source driven by the pulse width modulation signal and the preset display brightness of the screen, so that the regulated pulse width modulation signal drives the light source to enable the display brightness of the screen to be consistent with the preset display brightness, and the accurate control of the screen display brightness is realized.

Description

Display driving method and related device
Technical Field
The disclosure belongs to the technical field of display, and in particular relates to a display driving method and a related device.
Background
In the aspect of adjusting the display brightness of the screen, main ideas are that the displayed voltage value and gray level value are changed and the light emitting time of the screen is changed, and each ideas have respective advantages and disadvantages. The method for adjusting the overall display brightness of the screen by changing the light emitting time of the screen is also called pulse width modulation (Pulse Width Modulation, abbreviated as PWM), that is, the modulation of pulse width is used to adjust the overall display brightness of the screen by cycling in units of frames and adjusting the overall display brightness in units of line time.
Disclosure of Invention
In view of the foregoing, the present disclosure provides a display driving method and related apparatus, which aim to make the display brightness of a screen coincide with an expected value, and achieve accurate control of the display brightness of the screen.
According to a first aspect of the present disclosure, there is provided a display driving method including:
receiving a pulse width modulation signal sent by a light source driver;
adjusting the light emitting duration of at least one pulse of the pulse width modulation signal in a frame period according to adjustment data, wherein the adjustment data is determined based on the screen display brightness caused by the light source driven by the pulse width modulation signal and the preset display brightness of the screen;
and sending the regulated pulse width modulation signal to a light-emitting switch to drive the light source to emit light.
Optionally, the adjustment data includes at least one sub data, the sub data corresponding to a register and stored in the corresponding register, the sub data further corresponding to one pulse of the pulse width modulated signal during one frame for adjusting the corresponding pulse;
adjusting the light emitting duration of at least one pulse of the pulse width modulation signal in a frame period according to the adjustment data, wherein the method comprises the following steps: and reading the sub data from each register and adjusting the light emitting duration of the pulse corresponding to the sub data according to the read sub data.
Optionally, the display brightness of the screen caused by the light source driven by the pulse width modulation signal is smaller than the preset display brightness because the pulse width modulation signal has an invalid pulse pull-up area in a blank period of one frame;
the adjusting data comprises sub data, the light emitting duration of the pulse corresponding to the sub data is adjusted according to the read sub data, and the adjusting data comprises the following steps: and increasing the light emitting duration of the first pulse of the pulse width modulation signal in one frame period according to the read sub-data.
Optionally, increasing the light emitting duration of the first pulse of the pulse width modulation signal in a frame period according to the read sub-data includes:
acquiring a frame synchronization signal;
determining a first pulse of the pulse width modulated signal during a frame based on the frame synchronization signal;
and increasing the determined light emitting duration of the first pulse according to the read sub-data.
Optionally, the display brightness of the screen caused by the light source driven by the pulse width modulation signal is greater than the preset display brightness because the power supply voltage of the light source is greater than the preset voltage;
adjusting the luminous time length of the pulse corresponding to the read sub-data according to the sub-data, including: and reducing the light emitting duration of the pulse corresponding to the sub data according to the read sub data.
Optionally, the sub data is pre-calculated and stored in a corresponding register, and the sub data is calculated based on adjusting the light emitting duration of the pulse corresponding to the sub data to be within a target range, wherein the target range is not less than 0 and not more than the total width of each pulse in the pulse width modulation signal.
Optionally, adjusting the light emitting duration of the pulse corresponding to the read sub-data according to the sub-data includes:
judging whether the read sub-data can adjust the luminous duration of the pulse corresponding to the sub-data to be smaller than 0 or larger than the total width of each pulse in the pulse width modulation signal;
if the read sub-data does not adjust the light emitting duration of the pulse corresponding to the sub-data to be smaller than 0 or larger than the total width of each pulse in the pulse width modulation signal, adjusting the light emitting duration of the pulse corresponding to the sub-data according to the read sub-data.
Optionally, the display driving method further includes: if the read sub-data will adjust the light emitting duration of the pulse corresponding to the sub-data to be less than 0, correcting the read sub-data so that the corrected read sub-data adjusts the light emitting duration of the pulse corresponding to the sub-data to be 0.
Optionally, the display driving method further includes: if the read sub-data will adjust the light emitting duration of the pulse corresponding to the sub-data to be greater than the total width of each pulse in the pulse width modulation signal, correcting the read sub-data so that the corrected read sub-data adjusts the light emitting duration of the pulse corresponding to the sub-data to be the total width of each pulse in the pulse width modulation signal.
According to a second aspect of the present disclosure, there is provided a light source driving apparatus of a display device, comprising:
a light source driver for generating a pulse width modulation signal according to the control signal;
a light source regulator connected to the light source driver to receive the pulse width modulation signal and perform any one of the display driving methods of the first aspect based on the pulse width modulation signal;
the light source and the light-emitting switch are arranged on the light source and power supply connecting lines, and the light-emitting switch is connected with the light source regulator to receive the regulated pulse width modulation signal sent by the light source regulator so as to drive the light source to emit light.
The present disclosure brings the following beneficial effects:
according to the display driving method, the light emitting duration of at least one pulse of the pulse width modulation signal sent by the light source driver in one frame period is adjusted according to the adjustment data, and then the adjusted pulse width modulation signal is sent to the light emitting switch to drive the light source to emit light, wherein the adjustment data is determined based on the display brightness of the light source driven by the pulse width modulation signal and the preset display brightness, so that the adjusted pulse width modulation signal drives the light source to enable the display brightness of the screen to be consistent with the preset display brightness, and the accurate control of the display brightness of the screen is achieved.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the disclosure. The objectives and other advantages of the disclosure will be realized and attained by the structure particularly pointed out in the written description and drawings.
The foregoing objects, features and advantages of the disclosure will be more readily apparent from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of embodiments thereof with reference to the accompanying drawings in which:
fig. 1 is a timing diagram of a frame synchronization signal Vsync and a light source driving signal VSTE according to an exemplary embodiment of the present invention;
FIG. 2 is a flow chart of a display driving method according to an embodiment of the present disclosure;
fig. 3 is a timing diagram of a frame synchronization signal Vsync, a light source driving signal VSTE, and an adjusted source driving signal VSTE' according to an exemplary embodiment of the present invention;
fig. 4 is a schematic structural diagram of a light source driving device according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a display device using the light source driving apparatus according to the embodiment of the present disclosure;
fig. 6 is a schematic structural view of a display panel of another display device using the light source driving apparatus provided in the embodiment of the present disclosure;
fig. 7 is an exemplary circuit diagram of any pixel driving circuit in the display panel shown in fig. 6.
Detailed Description
Various embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts. For clarity, the various features of the drawings are not drawn to scale.
Fig. 1 illustrates a timing diagram of a frame synchronization signal Vsync and a light source driving signal VSTE according to an exemplary embodiment of the present invention.
Referring to fig. 1, the frame synchronization signal Vsync defines a frame FR including a display period DP during which an image is displayed on a screen and a blank period BP during which an image is not displayed on a screen, the front porch period FPP being between a start of the frame FR and a start of the display period DP, and the back porch period BPP being between an end of the display period DP and an end of the frame FR. The display period DP and the blank period in the frame FR are defined by the data enable signal DE, i.e., the frame FR is in the blank period BP during a period in which the data enable signal DE has not been asserted.
The light source driving signal VSTE shown in fig. 1 is a signal applied to the light emitting switch, and is embodied as a pulse width modulation signal. The pulse width modulation signal is circulated in units of frames, wherein the active state of each pulse controls the light-emitting switch to be closed so that the light source emits light, and the inactive state controls the light-emitting switch to be opened so that the light source does not emit light. In view of this, the active state of each pulse in the pulse width modulated signal is also referred to as a light emitting state, and the duration of the active state is also referred to as the light emitting duration of the pulse. The duration of the light emission of each pulse of a pulse width modulated signal within a frame will generally determine the display brightness of the screen. For an OLED (Organic Light-Emitting Diode) screen, the Light source driving signal VSTE controls each transistor; for LCD (Liquid Crystal Display ) screens, the light source drive signal VSTE controls the backlight. In fig. 1, the light source driving signal VSTE has 4 pulses within the frame FR, vset_period indicates the total width of each pulse, and vset_wid_l indicates the light emission duration of each pulse.
As can be seen from fig. 1, the first pulse of the light source driving signal VSTE during one frame period has a portion appearing in the blank period BP, that is, in an area where the data enable signal DE is not yet valid, which results in that the screen does not display data when the portion emits light, that is, the light source driving signal VSTE has a portion of the inactive pull-up area, so that the display brightness of the screen cannot be expected. In view of this, the embodiments of the present disclosure provide a display driving method aimed at making the display brightness of a screen to be expected by adjusting the light source driving signal VSTE.
Fig. 2 is a flowchart illustrating a display driving method according to an embodiment of the present disclosure. Referring to fig. 2, the display driving method includes:
step S120, receiving the pulse width modulation signal sent by the light source driver.
Specifically, a pulse width modulation signal transmitted by the light source driver, in which each pulse has the same total width and the same light emission duration, is used as the light source driving signal VSTE. A total pulse width and a light emission period are generally set based on the preset display brightness of the screen achieved under ideal conditions (i.e., parameters actually used when the display device is operated, i.e., preset parameters), and then the light source driver generates a pulse width adjustment signal based on the set total pulse width and the light emission period.
Step S140, adjusting the light emitting duration of at least one pulse of the pulse width modulation signal in a frame period according to the adjustment data.
Specifically, the light emitting duration of at least one pulse of the pulse width modulation signal in a frame period is adjusted based on the result of comparing the display brightness of the screen caused by the light source driven by the pulse width modulation signal with the preset display brightness of the screen, and the adjustment data represents the comparison result. In practice, the light emitting duration of one or more pulses of the pulse width modulation signal in a frame period may be increased according to the adjustment data, or the light emitting duration of one or more pulses of the pulse width modulation signal in a frame period may be decreased according to the adjustment data.
Step S160, the adjusted pulse width modulation signal is sent to a light-emitting switch to drive the light source to emit light.
Specifically, the pulse width modulation signal after adjustment is sent to the light-emitting switch, and the time period for controlling the opening and closing of the light-emitting switch is controlled. When the adjusted pulse width modulation signal has at least one pulse of light emitting duration increased compared with the pulse width modulation signal, the adjusted pulse width modulation signal controls the closing duration of the light emitting switch to be increased, and the light source emits light in one frame period to be increased, so that the display brightness of the screen is increased, and the situation corresponds to that the display brightness of the screen caused by the light source driven by the pulse width modulation signal is smaller than the preset display brightness of the screen; and compared with the pulse width modulation signal, the adjusted pulse width modulation signal has at least one pulse with reduced light emitting duration, the adjusted pulse width modulation signal controls the closing duration of the light emitting switch to be reduced, and the light source emits light within one frame period to reduce the display brightness of the screen, so that the display brightness of the screen caused by the light source driven by the pulse width modulation signal is larger than the preset display brightness of the screen.
According to the display driving method provided by the embodiment of the disclosure, the light emitting duration of at least one pulse of the pulse width modulation signal in one frame period is adjusted according to the adjustment data, so that the screen display brightness caused by the light source driven by the adjusted pulse width modulation signal is consistent with the preset display brightness of the screen, and the accurate control of the screen display brightness is realized. And the real-time requirements of display can be met by directly adjusting the light-emitting time according to the adjustment data.
In an alternative embodiment, the adjustment data includes at least one sub-data, where the sub-data corresponds to a register and is stored in the corresponding register, and the sub-data further corresponds to one pulse of the pulse width modulation signal during a frame period, for adjusting the corresponding pulse, and in step S140, adjusting the light emitting duration of the at least one pulse of the pulse width modulation signal during the frame period according to the adjustment data includes: and reading the sub data from each register and adjusting the light emitting duration of the pulse corresponding to the sub data according to the read sub data.
For example, the adjustment data includes a sub-data, where the sub-data is stored in the first register corresponding to the first register, and the sub-data is further used for increasing the light emitting duration of the first pulse corresponding to the first pulse of the pulse width modulation signal in a frame period, and the executing process of step S140 is: the sub data is read from the first register and the light emitting duration of the first pulse in one frame period is increased according to the sub data.
For another example, the adjustment data includes two sub data, namely sub data a and sub data B, wherein the sub data a is stored in the first register corresponding to the first register, and the sub data a is further used for reducing the light emitting duration of the first pulse corresponding to the first pulse of the pulse width modulation signal in one frame period; the sub data B is stored in the second register corresponding to the second register, and also corresponds to a second pulse of the pulse width modulation signal during one frame period for reducing the light emitting duration of the second pulse. In this case, the execution procedure of step S140 is: reading the sub data A from the first register and reducing the light emitting duration of the first pulse in one frame period according to the sub data A; the sub data B is also read from the second register and the light emission duration of the second pulse in one frame period is reduced in accordance with the sub data B.
The sub data is to indicate not only the amount of change in the light emission period but also whether to increase or decrease the light emission period.
In some examples, as described above, the display brightness of the screen caused by the driving of the light source by the pulse width modulation signal is smaller than the preset display brightness due to the invalid pulse pull-up area of the pulse width modulation signal in the blank period of one frame, where the adjustment data may include a sub-data, and the adjusting the light emitting duration of the pulse corresponding to the sub-data according to the read sub-data may include: and increasing the light emitting duration of the first pulse of the pulse width modulation signal in a frame period according to the read sub-data, so that the display brightness of the whole screen is increased, and the aim of enabling the display brightness of the screen to be consistent with the preset display brightness is fulfilled.
Further, the increasing the light emitting duration of the first pulse of the pulse width modulation signal in a frame period according to the read sub-data includes: the frame synchronization signal Vsync is acquired, then a first pulse of the pulse width modulation signal in one frame period is determined based on the frame synchronization signal Vsync, and then the light emitting duration of the determined first pulse is increased according to the read sub data.
Specifically, as shown in fig. 1, the pulse width modulated signal has an invalid pulse raised area as the light source driving signal VSTE in the blank period BP of one frame FR, and the light emitting area of the first pulse of the pulse width modulated signal in one frame FR is generally located in the front porch period FPP, so that the light emitting duration of the first pulse of the pulse width modulated signal in one frame FR can be increased only. The adjusted pulse width modulation signal, i.e. the adjusted light source driving signal VSTE ', referring to fig. 3, specifically, the light emitting duration of the first pulse in a frame FR is the sum of the front porch period FPP and the original light emitting duration vset_wid_l of the pulse, so that the adjusted light source driving signal VSTE' has 4 pull-up regions with width vset_wid_l in the display period DP, and the display brightness of the screen can be consistent with the preset display brightness. In this case, the sub data may be the light emitting duration of the first pulse of the adjusted pulse width modulation signal within one frame FR, that is, the sum of the front porch period FPP and the original light emitting duration vset_wid_l of the pulse.
In other examples, the display brightness of the screen caused by the driving of the light source by the pulse width modulation signal is greater than the preset display brightness because the supply voltage of the light source is greater than the preset voltage, where the adjusting the light emitting duration of the pulse corresponding to the sub-data according to the read sub-data includes: and reducing the luminous time length of the pulse corresponding to the sub data according to the read sub data, so that the display brightness of the whole screen is reduced, and the aim of enabling the display brightness of the screen to be consistent with the preset display brightness is fulfilled.
In another alternative embodiment, the sub-data is pre-calculated and stored in a corresponding register, and the sub-data is calculated based on adjusting the light emitting duration of the pulse corresponding to the sub-data to within a target range, wherein the target range is not less than 0 and not more than the total width of each pulse in the pulse width modulation signal, i.e. when the sub-data is set, it is ensured that the sub-data does not adjust the light emitting duration of the pulse to overflow the target range.
In yet another alternative embodiment, adjusting the light emitting duration of the pulse corresponding to the sub-data according to the read sub-data includes: judging whether the read sub-data can adjust the luminous duration of the pulse corresponding to the sub-data to be smaller than 0 or larger than the total width of each pulse in the pulse width modulation signal, wherein if the read sub-data cannot adjust the luminous duration of the pulse corresponding to the sub-data to be smaller than 0 or larger than the total width of each pulse in the pulse width modulation signal, the luminous duration of the pulse corresponding to the sub-data is adjusted according to the read sub-data.
Further, if the read sub-data will adjust the light emitting duration of the pulse corresponding to the sub-data to be less than 0, the read sub-data is corrected, so that the corrected read sub-data adjusts the light emitting duration of the pulse corresponding to the sub-data to be 0. In practice, the corrected sub data may be set to 0 in this case, so that the light emitting duration of the pulse corresponding to the corrected sub data is directly adjusted to 0 according to the corrected sub data, that is, the duty ratio of the light emitting section is made to be 0, so as to reach the minimum.
Further, if the read sub-data will adjust the light emitting duration of the pulse corresponding to the sub-data to be greater than the total width of each pulse in the pulse width modulation signal, the read sub-data is corrected, so that the corrected read sub-data adjusts the light emitting duration of the pulse corresponding to the sub-data to be the total width of each pulse in the pulse width modulation signal. In practice, the corrected sub data may be set to the total width of the pulse, so that the light emitting duration of the pulse corresponding to the sub data is directly adjusted to the total width of the pulse according to the corrected sub data, that is, the duty ratio of the light emitting section is 1, so as to reach the maximum.
In the embodiment of the disclosure, whether the read sub data can adjust the light emitting duration of the pulse corresponding to the sub data to be smaller than 0 or larger than the total width of each pulse in the pulse width modulation signal is judged, namely, overflow judgment is firstly carried out, wherein the sub data is directly used under the condition of no overflow; when overflow occurs due to incorrect operation of calculation, the sub data is corrected, and then the corrected sub data is used, so that display driving can be continued.
Corresponding to the display driving method provided above, the embodiment of the disclosure also provides a light source driving device of the display device. Fig. 4 is a schematic diagram of a light source driving device. Referring to fig. 4, the light source driving apparatus 100 includes: the light source driver 110, the light source regulator 120, the light source 130 and the light-emitting switch 140 arranged on the connection line between the light source 130 and the power supply 200, wherein the light source driver 110 is used for generating a pulse width modulation signal according to a control signal; the light source regulator 120 is connected with the light source driver 110 to receive the pulse width modulation signal and perform the display driving method described in any one of the above embodiments based on the pulse width modulation signal; the light emitting switch 140 is connected to the light source regulator 120 to receive the regulated pulse width modulation signal sent by the light source regulator 120 to drive the light source to emit light, so that the screen of the display device displays images with preset display brightness.
The display device may be an LCD display. Fig. 5 is a schematic diagram of an LCD display using the light source driving apparatus 100 according to the embodiment of the present disclosure. Referring to fig. 5, the LCD display includes: the light source driving apparatus 100, the power supply 200, the display panel 300, the source driver 400, the gate driver 500, and the timing controller 600.
The display panel 300 receives a DATA signal DS based on the image DATA supplied from the timing controller 600 to display an image. For example, according to an exemplary embodiment, the image DATA may include two-dimensional image DATA for displaying a two-dimensional image and/or three-dimensional image DATA including, for example, left-eye image DATA and right-eye image DATA for displaying a three-dimensional image. The display panel 300 includes a plurality of gate lines GL extending in a horizontal direction, a plurality of data lines DL extending in a vertical direction, and a plurality of pixels (not shown in the drawings) each including a thin film transistor electrically connected to the corresponding gate line GL and data line DL.
The gate driver 500 generates a gate signal GS in response to the gate start signal STV and the gate clock signal CLK1 supplied from the timing controller 600, and outputs the gate signal GS to the gate line GL. The source driver 400 generates a data signal DS in response to the data start signal STH, the data enable signal DE, and the data clock signal CLK2 supplied from the timing controller 600, and outputs the data signal DS to the data line DL. In an exemplary embodiment, the timing controller 600 receives the image DATA and the instruction signal CON from an external device. The command signal CON may include, for example, a row synchronization signal Hsync, a frame synchronization signal Vsync, a clock signal CLK, and a data enable signal DE. The timing controller 600 generates a data start signal STH using a row synchronization signal Hsync and outputs the data start signal STH to the source driver 400. The timing controller 600 generates a gate start signal STV using the frame synchronization signal Vsync and outputs the gate start signal STV to the gate driver 500. The timing controller 600 generates the gate clock signal CLK1 and the data clock signal CLK2 using the clock signal CLK, and outputs the gate clock signal CLK1 and the data clock signal CLK2 to the gate driver 500 and the source driver 400, respectively. The timing controller 600 outputs the data enable signal DE to the source driver 400.
The light source driving apparatus 100 includes a light source driver 110, a light source regulator 120, a light source 130 as a backlight, and a light emitting switch 140. The timing controller 600 also outputs the image DATA to the light source driver 110 to cause the light source driver 110 to generate a light source driving signal VSTE as a control signal; in addition, the timing controller 600 also outputs the frame synchronization signal Vsync to the light source regulator 120 so that the light source regulator 120 performs the adjustment of the light source driving signal VSTE based on the frame synchronization signal Vsync to generate the adjusted light source driving signal VSTE'. The adjusted light source driving signal VSTE 'is transmitted to the light emitting switch 140 by the light source adjuster 120 to control the on and off of the light emitting switch 140, and thus to control the light source 130 as a backlight to emit light or not, so that the display panel 300 has the display brightness controlled by the adjusted light source driving signal VSTE' as a screen for displaying an image. Since the adjusted light source driving signal VSTE' is obtained by adjusting at least one pulse light emitting period in the light source driving signal VSTE according to the adjustment data, the display panel 300 of the LCD display can display with a preset display brightness.
The display device may also be an OLED display. Fig. 6 is a schematic structural diagram of a display panel of an OLED display using the light source driving device according to the embodiment of the present disclosure. Referring to fig. 6, the display panel includes a plurality of data lines DL, a plurality of gate lines GL, a plurality of pulse width modulation signal lines PWM, and a plurality of pixel driving circuits. The plurality of pixel driving circuits are arranged in an array to form a pixel array. In each row of pixel driving circuits, a first input end of the pixel driving circuits are commonly connected to a power supply, a second input end of the pixel driving circuits are commonly connected to a pulse width modulation signal line PWM, and a third input end of the pixel driving circuits are commonly connected to a gate line GL (the top of each pixel driving circuit in the figure is sequentially provided with a first input end, a second input end and a third input end from right to left); in each column of pixel driving circuits, the fourth input terminals of the plurality of pixel driving circuits are commonly connected to the data line DL. In this embodiment, each row of pixel driving circuits may share one pulse width modulation signal line PWM.
The circuit diagram of each pixel driving circuit in fig. 6 can be as shown in fig. 7. Referring to fig. 7, the pixel driving circuit includes a writing unit 211, a storage unit 212, a driving control unit 213, a dimming unit 214, and a light emitting element D. Specifically, the writing unit 211 is implemented by a switching transistor T1, and the on and off of the switching transistor T1 is controlled by the gate signal GS transmitted from the gate line GL; the storage unit 212 is implemented by a capacitor Cs for receiving a data voltage (i.e., a voltage of a data signal) supplied from the data line DL via the writing unit 211 and storing the data voltage; the driving control unit 213 is implemented through a switching transistor T2 for driving the light emitting element D according to the power supply voltage Vdd and the stored data voltage during the off period of the writing unit 211 such that the light emitting element D has a driving voltage or driving current; the dimming unit 214 is implemented by a switching tube T3, and is configured to provide a current path from the driving control unit 213 to the light emitting element D, and control the regulated light source driving signal VSTE 'transmitted by the pulse width modulation signal line PWM based on the on and off of the current path of the switching tube T3, so that whether the light emitting element D emits light is controlled by the regulated light source driving signal VSTE'. Since the adjusted light source driving signal VSTE' is obtained by adjusting at least one pulse light emitting duration in the light source driving signal VSTE according to the adjustment data, the display panel of the OLED display as a whole can be finally displayed with a preset display brightness.
In describing the embodiments, the differences from other embodiments will be explained, and the same or similar parts between the embodiments may be understood by referring to each other. For this embodiment of the light source driving device, reference is made to the description of the method embodiment part for the relevant point, since it is substantially similar to the method embodiment. Since the embodiment of the light source driving device has the advantages achieved by the above embodiment of the method, details of the foregoing embodiment will not be described herein.
The flowcharts, block diagrams in the figures illustrate the possible architecture, functionality, and operation of the systems, methods, and apparatus of embodiments of the present disclosure, and the blocks in the flowcharts and block diagrams may represent a module, a program segment, or a mere piece of code, which is executable instructions for implementing the specified logical function(s). It should also be noted that the executable instructions that implement the specified logic functions may be recombined to produce new modules and program segments. The blocks of the drawings and the order of the blocks are thus merely to better illustrate the processes and steps of the embodiments and should not be taken as limiting the invention itself.
Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present disclosure, and are not intended to limit the scope of the disclosure, but the present disclosure is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, it is not limited to the disclosure: any person skilled in the art, within the technical scope of the disclosure of the present disclosure, may modify or easily conceive changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features thereof; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the disclosure, and are intended to be included within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims (10)

1. A display driving method, comprising:
receiving a pulse width modulation signal sent by a light source driver;
adjusting the light emitting duration of at least one pulse of the pulse width modulation signal in a frame period according to adjustment data, wherein the adjustment data is determined based on the screen display brightness caused by the light source driven by the pulse width modulation signal and the preset display brightness of the screen;
and sending the regulated pulse width modulation signal to a light-emitting switch to drive the light source to emit light.
2. The display driving method according to claim 1, wherein,
the adjustment data includes at least one sub data corresponding to a register stored in the corresponding register, the sub data further corresponding to one pulse of the pulse width modulation signal during one frame for adjusting the corresponding pulse;
adjusting the light emitting duration of at least one pulse of the pulse width modulation signal in a frame period according to the adjustment data, wherein the method comprises the following steps: and reading the sub data from each register and adjusting the light emitting duration of the pulse corresponding to the sub data according to the read sub data.
3. The display driving method according to claim 2, wherein,
the display brightness of the screen caused by the light source driven by the pulse width modulation signal is smaller than the preset display brightness because the pulse width modulation signal has an invalid pulse heightening area in a blank period of one frame;
the adjusting data comprises sub data, the light emitting duration of the pulse corresponding to the sub data is adjusted according to the read sub data, and the adjusting data comprises the following steps: and increasing the light emitting duration of the first pulse of the pulse width modulation signal in one frame period according to the read sub-data.
4. A display driving method according to claim 3, wherein increasing the light emission duration of the first pulse of the pulse width modulation signal in one frame period according to the read sub-data comprises:
acquiring a frame synchronization signal;
determining a first pulse of the pulse width modulated signal during a frame based on the frame synchronization signal;
and increasing the determined light emitting duration of the first pulse according to the read sub-data.
5. The display driving method according to claim 2, wherein,
the display brightness of the screen caused by the light source driven by the pulse width modulation signal is larger than the preset display brightness because the power supply voltage of the light source is larger than the preset voltage;
adjusting the luminous time length of the pulse corresponding to the read sub-data according to the sub-data, including: and reducing the light emitting duration of the pulse corresponding to the sub data according to the read sub data.
6. The display driving method according to claim 2, wherein the sub data is pre-calculated and stored in a corresponding register, and the sub data is calculated based on adjusting a light emission time length of a pulse corresponding to the sub data to be within a target range, the target range being not less than 0 and not more than a total width of each pulse in the pulse width modulation signal.
7. The display driving method according to claim 2, wherein adjusting a light emission period of a pulse corresponding to the sub data according to the read sub data comprises:
judging whether the read sub-data can adjust the luminous duration of the pulse corresponding to the sub-data to be smaller than 0 or larger than the total width of each pulse in the pulse width modulation signal;
if the read sub-data does not adjust the light emitting duration of the pulse corresponding to the sub-data to be smaller than 0 or larger than the total width of each pulse in the pulse width modulation signal, adjusting the light emitting duration of the pulse corresponding to the sub-data according to the read sub-data.
8. The display driving method according to claim 7, further comprising: if the read sub-data will adjust the light emitting duration of the pulse corresponding to the sub-data to be less than 0, correcting the read sub-data so that the corrected read sub-data adjusts the light emitting duration of the pulse corresponding to the sub-data to be 0.
9. The display driving method according to claim 7, further comprising: if the read sub-data will adjust the light emitting duration of the pulse corresponding to the sub-data to be greater than the total width of each pulse in the pulse width modulation signal, correcting the read sub-data so that the corrected read sub-data adjusts the light emitting duration of the pulse corresponding to the sub-data to be the total width of each pulse in the pulse width modulation signal.
10. A light source driving apparatus of a display device, comprising:
a light source driver for generating a pulse width modulation signal according to the control signal;
a light source regulator connected to the light source driver to receive the pulse width modulation signal and perform the display driving method of any one of claims 1 to 9 based on the pulse width modulation signal;
the light source and the light-emitting switch are arranged on the light source and power supply connecting lines, and the light-emitting switch is connected with the light source regulator to receive the regulated pulse width modulation signal sent by the light source regulator so as to drive the light source to emit light.
CN202311011929.XA 2023-08-11 2023-08-11 Display driving method and related device Pending CN117153111A (en)

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