CN110415652B - Display driving method and display driving circuit - Google Patents
Display driving method and display driving circuit Download PDFInfo
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- CN110415652B CN110415652B CN201910596455.7A CN201910596455A CN110415652B CN 110415652 B CN110415652 B CN 110415652B CN 201910596455 A CN201910596455 A CN 201910596455A CN 110415652 B CN110415652 B CN 110415652B
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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
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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
- G09G3/36—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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
- G09G2320/062—Adjustment of illumination source parameters
Abstract
The invention provides a display driving method and a display driving circuit, the display driving method includes judging whether a display mode is a wide viewing angle display mode or a narrow viewing angle display mode according to a mode selection signal; judging whether the picture data sent by the display card in the current frame is different from the picture data sent by the previous frame or not, if so, judging that the display panel displays a dynamic picture, and if so, judging that the display panel displays a static picture; in the narrow visual angle display mode, if the dynamic picture is judged to be displayed, a first adjusting instruction is sent to a backlight driver to enable each backlight partition to send out backlight with the same brightness; if the static picture is judged to be displayed, the gray-scale value of each backlight subarea in the static picture is obtained to calculate and obtain the first subarea adjusting backlight brightness value of each backlight subarea, and a second adjusting instruction is sent to the backlight driver. The invention avoids the moving area with obviously too dark brightness on the picture, enhances the contrast ratio of the static picture and improves the watching experience of the user.
Description
Technical Field
The present invention relates to the field of liquid crystal display, and in particular, to a display driving method and a display driving circuit.
Background
The liquid crystal display device has the advantages of good picture quality, small volume, light weight, low driving voltage, low power consumption, no radiation and relatively low manufacturing cost, and is dominant in the field of flat panel display. As the demand for liquid crystal display devices has increased, Hybrid Viewing Angle (HVA) type liquid crystal display devices have been developed. The hybrid viewing angle type liquid crystal display device has a wide viewing angle display mode and a narrow viewing angle display mode. In order to enhance the display effect and save the backlight power consumption, the hybrid viewing angle type liquid crystal display device also employs a High Dynamic Range (HDR) technology and a Local Dimming (Local Dimming) technology. The area backlight brightness control technology is to divide the picture into areas and change the backlight brightness of each area according to the gray-scale value of each area, so that the brightness of the bright area of the picture is increased and the brightness of the dark area of the picture is reduced, thereby achieving the optimal contrast.
However, in the hybrid viewing angle type liquid crystal display device, due to the light leakage characteristic of the hybrid viewing angle, if the high dynamic range technology and the area backlight luminance control technology are applied, a moving area with significantly too dark luminance is likely to appear on the screen in the narrow viewing angle display mode. In order to pursue lightness and thinness, the internal liquid crystal display module of the notebook computer uses a backlight source of a lateral-in type backlight (1D Dimming), namely, backlight brightness is adjusted according to light bar division areas, and a strip area with obviously too dark brightness and left-right movement easily appears on a picture in a narrow visual angle display mode, so that poor viewing experience is provided for a user.
Disclosure of Invention
In view of the above, the present invention provides a display driving method and a display driving circuit to solve the technical problem that a moving area with significantly too dark brightness is easily generated on a screen in a narrow viewing angle display mode.
To achieve the above object, an embodiment of the present invention provides a display driving method, including: determining whether the display mode is a wide viewing angle display mode or a narrow viewing angle display mode according to the mode selection signal; judging whether the picture data sent by the display card in the current frame is different from the picture data sent by the previous frame or not, if so, judging that the display panel displays a dynamic picture, and if so, judging that the display panel displays a static picture; in the narrow viewing angle display mode, if the display panel is judged to display the dynamic picture, a first adjusting instruction is sent to a backlight driver to enable each backlight partition to send out backlight with the same brightness; if the display panel is judged to display the static picture, the gray-scale value of each backlight partition in the static picture is obtained to calculate and obtain the first partition adjustment backlight brightness value of each backlight partition, and a second adjustment instruction is sent to the backlight driver to enable the brightness value of the backlight sent by each backlight partition to be the first partition adjustment backlight brightness value.
Further, the step of determining whether the picture data sent by the display card in the current frame is different from the picture data sent by the previous frame includes: if the current frame is different from the current frame, the time sequence controller sends the frame data sent by the display card at the current frame to a source electrode driver as the current frame data so that the display panel displays a dynamic frame; if the current frame is the same as the current frame, the time sequence controller sends the image data sent by the display card at the current frame to the source electrode driver as the current frame image data, so that the display panel displays a static image.
Further, the step of determining whether the picture data sent by the display card in the current frame is different from the picture data sent by the previous frame includes: if the current frame of the image data sent by the display card is different from the current frame of the image data sent by the display card, the time schedule controller is connected with the display card and sends the image data sent by the display card at the current frame of the image data as the current frame of the image data to the source electrode driver, so that the display panel displays the dynamic image; if the current frame is the same as the current frame, the time sequence controller is disconnected with the display card and sends the cache picture data of the previous dynamic picture as the current frame picture data to the source electrode driver, so that the display panel displays a static picture.
Further, the step of sending the first adjustment instruction to the backlight driver to make each backlight partition emit backlight with the same brightness includes: and acquiring the gray-scale value of each backlight partition in the dynamic picture, calculating to obtain the average value of the gray-scale values of all the backlight partitions so as to determine the global uniform backlight brightness value, and sending the first adjusting instruction to the backlight driver so as to adjust the backlight partitions to emit backlight with the same brightness, wherein the brightness value of the backlight is the global uniform backlight brightness value.
Further, the step of sending the first adjustment instruction to the backlight driver to make each backlight partition emit backlight with the same brightness includes: the first adjusting instruction is sent to the backlight driver to adjust the backlight with the same brightness sent by each backlight partition, and the brightness value of the backlight is kept unchanged in each frame.
Further, the step of sending the first adjustment instruction to the backlight driver to make each backlight partition emit backlight with the same brightness includes: the backlight driver outputs the same current to the light-emitting lamp strings corresponding to the backlight partitions according to the first adjusting instruction; the step of sending the second adjustment instruction to the backlight driver to enable the brightness value of the backlight emitted by each backlight partition to be the first partition adjustment backlight brightness value comprises: and the backlight driver outputs current corresponding to the backlight brightness value adjusted by the first partition to the light-emitting lamp strings corresponding to the backlight partitions according to the second adjusting instruction.
Further, if it is determined that the display panel displays the static image, the step of obtaining the gray-scale value of each backlight partition in the static image to calculate the first partition-adjusted backlight brightness value of each backlight partition, and sending the second adjustment instruction to the backlight driver includes: and acquiring a static initial backlight brightness value of each backlight partition, wherein the backlight driver enables the brightness value of the backlight emitted by each backlight partition to be increased or decreased from the static initial backlight brightness value to the first partition regulation backlight brightness value in the starting stage according to the second regulation instruction, and is decreased or increased from the first partition regulation backlight brightness value to the static initial backlight brightness value in the ending stage.
Further, the step of making the brightness value of the backlight emitted by each backlight partition increment or decrement from the static initial backlight brightness value to the first partition adjusting backlight brightness value in the initial stage, and the step of making the brightness value of the backlight emitted by each backlight partition decrement or increment from the first partition adjusting backlight brightness value to the static initial backlight brightness value in the end stage includes: and controlling the thin film transistor in the display panel to be in an open state correspondingly for multiple times in the starting stage and the ending stage, and displaying multiple frames of static pictures by the display panel according to picture data in the previous dynamic picture.
Further, the step of determining whether the display mode is the wide viewing angle display mode or the narrow viewing angle display mode according to the mode selection signal includes: and in the wide-view-angle display mode, calculating to obtain a second partition adjustment backlight brightness value corresponding to each backlight partition according to the gray-scale value of each backlight partition in the picture displayed by the display panel, and sending a third adjustment instruction to the backlight driver, so that the brightness value of the backlight sent by each backlight partition is the second partition adjustment backlight brightness value.
The embodiment of the invention also provides a display driving circuit, which comprises a mode detection module, a picture judgment module and a backlight control module; the mode detection module is used for judging whether the display mode is a wide view angle display mode or a narrow view angle display mode according to the mode selection signal; the image judging module is used for judging whether the image data sent by the display card in the current frame is different from the image data sent by the display card in the previous frame, if so, judging that the display panel displays a dynamic image, and if so, judging that the display panel displays a static image; the backlight control module is used for sending a first adjusting instruction to the backlight driver to enable each backlight partition to send backlight with the same brightness if the display panel is judged to display a dynamic picture in the narrow viewing angle display mode; if the display panel is judged to display the static picture, the gray-scale value of each backlight partition in the static picture is obtained to calculate and obtain the first partition adjustment backlight brightness value of each backlight partition, and a second adjustment instruction is sent to the backlight driver to enable the brightness value of the backlight sent by each backlight partition to be the first partition adjustment backlight brightness value.
In the display driving method and the display driving circuit provided by the embodiment, in the narrow viewing angle display mode, if the display panel is judged to display a dynamic picture, each backlight partition is controlled to emit backlight with the same brightness, so that an area with obvious and excessively dark brightness does not appear on the picture; if the display panel is judged to display the static picture, the brightness value of the backlight emitted by each backlight partition is controlled to be the first partition to adjust the brightness value of the backlight, and even if an area with obviously too dark brightness appears in the picture, the area cannot move. Therefore, the method can still be applied to a high dynamic range technology and an area backlight brightness control technology in a narrow viewing angle display mode, avoids a moving area with obviously too dark brightness on a picture, and also enhances the contrast ratio in a static picture, thereby improving the watching experience of a user.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a flowchart of a display driving method according to a first embodiment of the invention.
Fig. 2 is a flowchart of a display driving method according to a first embodiment of the invention.
Fig. 3 is a flowchart of a display driving method according to another embodiment of the first embodiment of the invention.
FIG. 4 is a first schematic view of the backlight brightness of a dynamic picture with a narrow viewing angle display mode according to a first embodiment of the present invention.
FIG. 5 is a second schematic view of the backlight brightness of the dynamic picture with the narrow viewing angle display mode according to the first embodiment of the present invention.
FIG. 6 is a schematic diagram illustrating a variation of backlight brightness of a still picture in a narrow viewing angle display mode according to a first embodiment of the present invention.
FIG. 7 is a diagram of a display driver circuit according to a second embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose, the following detailed description is given for the embodiments, methods, steps, structures, features and effects of the display driving method and the display driving circuit according to the present invention with reference to the accompanying drawings and preferred embodiments.
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings. While the invention has been described in connection with specific embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.
First embodiment
Referring to fig. 1, fig. 1 is a flowchart illustrating a display driving method according to a first embodiment of the present invention. As shown in fig. 1, the display driving method includes:
s1: and determining whether the display mode is a wide viewing angle display mode or a narrow viewing angle display mode according to the mode selection signal.
In one embodiment, the mode selection signal may be at a low level, and the display mode is determined to be the wide viewing angle display mode according to the mode selection signal being at the low level; the mode selection signal may be a high level, and according to the high level of the mode selection signal, the display mode is determined to be the narrow viewing angle display mode.
S2: and judging whether the picture data sent by the display card in the current frame is different from the picture data sent by the previous frame or not, if so, judging that the display panel displays the dynamic picture, and if so, judging that the display panel displays the static picture.
When the current frame image data is different from the previous frame image data, the display panel displays a new image different from the previous frame image on the current frame, namely the display panel displays a dynamic image; when the current frame image data is the same as the previous frame image data, the images of the current frame image and the previous frame image displayed by the display panel are not changed, namely the display panel displays a static image. In addition, when the display panel displays a static picture, the display panel must have the previous frame picture data to enable the display panel to display a dynamic picture, and the current frame picture data is the same as the previous frame picture data, so that the current frame picture data can enable the display panel to display the static picture, and because the current frame picture data is the same as the previous frame picture data, the static picture displayed by the display panel and the previous dynamic picture are the same picture, so that the display panel can display the static picture according to the current frame picture data or the cache picture data of the previous dynamic picture.
In one embodiment, the determining whether the picture data sent by the video card in the current frame is different from the picture data sent by the video card in the previous frame includes: s6, if different, the time sequence Controller (TCON, Timing Controller) sends the image data sent by the display card at the current frame as the current frame image data to the source driver, so that the display panel displays the dynamic image; and S7, if the current frame is the same as the current frame, the time sequence controller sends the image data sent by the display card at the current frame to the source electrode driver as the current frame image data, so that the display panel displays the static image. The display driving method of the present embodiment is as shown in fig. 2, and after determining whether the picture data sent by the display card in the current frame is different from the picture data sent by the previous frame, no matter whether the picture data in the current frame is different from the picture data in the previous frame, the timing controller is connected to the display card and sends the picture data sent by the display card in the current frame as the picture data in the current frame to the source driver, so that the source driver provides a corresponding data voltage to the display panel, and the display panel receives the data voltage to display a corresponding dynamic picture or a corresponding static picture.
In one embodiment, the determining whether the picture data sent by the video card in the current frame is different from the picture data sent by the video card in the previous frame includes: s8, if the current frame sent by the display card is different, the picture data sent by the display card at the current frame is the picture data of the dynamic picture, the time schedule controller is connected with the display card and sends the picture data sent by the display card at the current frame as the current frame picture data to the source electrode driver, so that the display panel displays the dynamic picture; and S9, if the data are the same, disconnecting the time schedule controller from the display card and sending the cache picture data of the previous dynamic picture as the current frame picture data to the source electrode driver to enable the display panel to display the static picture. As shown in fig. 3, the display driving method of this embodiment determines whether the timing controller is connected to the display card according to whether the picture data sent by the display card in the current frame is different from the picture data sent by the previous frame, the timing controller determines that the picture data sent by the display card in the current frame or the cache picture data of the previous dynamic picture is used as the picture data of the current frame, and sends the picture data of the current frame to the source driver, and the display panel correspondingly displays the dynamic picture or the static picture according to the picture data of the current frame. That is, the present embodiment may employ a screen Self Refresh (hereinafter, abbreviated as "PSR") technique of automatically disconnecting the connection with the front-end video card for data Refresh by the timing controller when detecting that the current frame picture data is the same as the previous frame picture data, to reduce power consumption. PSR technology can save system power on a display device to extend battery life in a mobile application environment. When still picture data is provided, the PSR technique may enable the display panel to display a still picture at a frequency as low as 48Hz, which is the lowest possible frequency at which flicker is not visible.
S3: in the narrow viewing angle display mode, if the display panel is judged to display a dynamic picture, a first adjusting instruction is sent to the backlight driver to enable each backlight partition to send out backlight with the same brightness; if the display panel is judged to display the static picture, the gray-scale value of each backlight partition in the static picture is obtained to calculate and obtain the first partition adjustment backlight brightness value of each backlight partition, and a second adjustment instruction is sent to the backlight driver to enable the brightness value of the backlight sent by each backlight partition to be the first partition adjustment backlight brightness value.
In this embodiment, in the narrow viewing angle display mode, if it is determined that the display panel displays the dynamic image, the backlight driver receives the first adjustment instruction and controls each backlight partition to emit the backlight with the same brightness. In this embodiment, an area backlight brightness control technique is not used to adjust the backlight brightness difference of each backlight partition, the brightness of the bright area of the screen is not larger to form an obviously over-bright area, and the brightness of the dark area of the screen is not smaller to form an obviously over-dark area. Therefore, in the narrow viewing angle display mode, if a dynamic picture is displayed, an area with obviously too dark brightness cannot appear on the picture, and the moving area with obviously too dark brightness on the picture is also avoided, so that the watching experience of a user is improved.
In one embodiment, the step of sending the first adjustment instruction to the backlight driver to make each backlight partition emit the backlight with the same brightness includes: the method comprises the steps of obtaining gray-scale values of all backlight partitions in a dynamic picture, calculating to obtain an average value of the gray-scale values of all the backlight partitions to determine a global uniform backlight brightness value, and sending a first adjusting instruction to a backlight driver to adjust the backlight partitions to send out backlight with the same brightness, wherein the brightness value of the backlight is the global uniform backlight brightness value. The backlight driver receives the first adjusting instruction and controls the brightness value sent by each backlight partition to be the global uniform backlight brightness value. Because the global uniform backlight brightness value corresponds to the gray-scale value of each backlight partition in the dynamic picture of the current frame, the size of the global uniform backlight brightness value will be correspondingly adjusted and changed according to the displayed dynamic picture when each frame of dynamic picture is displayed. Fig. 4 is a first schematic view of the backlight brightness of the dynamic picture in the narrow viewing angle display mode according to the first embodiment of the present invention, as shown in fig. 4, when the display panel continuously displays the N-1 th frame dynamic picture, the N-th frame dynamic picture and the N +1 th frame dynamic picture, the brightness value of the backlight of each backlight partition of each frame dynamic picture is the same, but the brightness values of the backlights of the backlight partitions of two adjacent frames are different. In this embodiment, the backlight of each backlight partition may be increased or decreased according to the brightness or darkness of the entire screen, and the luminance value of the backlight of each backlight partition may be kept constant, thereby reducing the power consumption of the backlight.
In one embodiment, the step of sending the first adjustment instruction to the backlight driver to make each backlight partition emit the backlight with the same brightness includes: the first adjusting instruction is sent to the backlight driver to adjust the backlight which emits the same brightness in each backlight partition, and the brightness value of the backlight is kept unchanged in each frame. Fig. 5 is a second schematic view of the backlight brightness of the dynamic picture in the narrow viewing angle display mode according to the first embodiment of the present invention, as shown in fig. 5, when the display panel continuously displays the N-1 th frame dynamic picture, the N-th frame dynamic picture and the N +1 th frame dynamic picture, the brightness value of the backlight of each backlight partition of each frame dynamic picture is the same, and the brightness value of the backlight of each backlight partition of two adjacent frames pictures is also the same.
S4: if the display panel is judged to display the static picture, the gray-scale value of each backlight partition in the static picture is obtained to calculate and obtain the first partition adjustment backlight brightness value of each backlight partition, and a second adjustment instruction is sent to the backlight driver to enable the brightness value of the backlight sent by each backlight partition to be the first partition adjustment backlight brightness value.
In this embodiment, in the narrow viewing angle display mode, if it is determined that the display panel displays the static image, the gray scale value of each backlight partition in the static image is obtained to calculate a first partition adjustment backlight brightness value of each backlight partition and may be used to generate a second adjustment instruction, and the backlight driver receives the second adjustment instruction and controls the brightness value sent by each backlight partition to be the first partition adjustment backlight brightness value. In this embodiment, the regional backlight brightness control technique may be used to adjust the backlight brightness of each backlight partition to be different, where the brightness of the bright region of the picture is larger to form an obviously over-bright region, and the brightness of the dark region of the picture is smaller to form an obviously over-dark region, so as to enhance the contrast of the picture. Therefore, in the narrow viewing angle display mode, if a static picture is displayed, an area with obviously too dark brightness appears on the picture, but the area with obviously too dark brightness does not move, so that the moving area with obviously too dark brightness appears on the picture is avoided, and the viewing experience of a user is improved.
In this embodiment, the backlight driver may drive the backlight source to make each backlight partition emit corresponding backlight, and the backlight source may be, but is not limited to, an LED (Light Emitting Diode) Light source. The present embodiment will be described below by taking a backlight as an LED light source. The backlight source may include a plurality of sets of light emitting strings corresponding to the plurality of backlight partitions, the backlight driver outputs corresponding currents to the light emitting strings corresponding to the backlight partitions according to the adjustment instruction, and the light emitting strings of each backlight partition emit backlight with corresponding brightness values according to the received corresponding currents, so that the backlight driver may drive each backlight partition to emit corresponding backlight.
In one embodiment, the step of sending the first adjustment instruction to the backlight driver to make each backlight partition emit the backlight with the same brightness may include: the backlight driver outputs the same current to the light-emitting lamp strings corresponding to the backlight partitions according to the first regulating instruction; the step of sending a second adjusting instruction to the backlight driver to make the brightness value of the backlight sent by each backlight partition be the first partition adjusting backlight brightness value comprises: and the backlight driver outputs current corresponding to the backlight brightness value adjusted by the first partition to the light-emitting lamp strings corresponding to the backlight partitions according to the second adjusting instruction. The backlight driver can output the same current to the light-emitting lamp strings corresponding to the backlight partitions according to the first regulating instruction, and the light-emitting lamp strings of each backlight partition can emit backlight with the same brightness value according to the same magnitude of the received current, so that the backlight driver can drive each backlight partition to emit the same backlight; the backlight driver can output current corresponding to the backlight brightness value adjusted by the first partition to the light-emitting lamp strings corresponding to the backlight partitions according to the second adjusting instruction, and the light-emitting lamp strings of each backlight partition can emit backlight corresponding to the backlight brightness value adjusted by the first partition according to the received corresponding current, so that the backlight driver can drive each backlight partition to emit backlight corresponding to the backlight brightness value adjusted by the first partition.
In an embodiment, if it is determined that the display panel displays the static image, the step of obtaining the gray-scale value of each backlight partition in the static image to calculate the first partition-adjusted backlight brightness value of each backlight partition, and sending the second adjustment instruction to the backlight driver may include: and acquiring a static initial backlight brightness value of each backlight partition, enabling the backlight driver to enable the brightness value of the backlight emitted by each backlight partition to be increased or decreased from the static initial backlight brightness value to a first partition adjusting backlight brightness value at the beginning stage according to a second adjusting instruction, and enabling the backlight brightness value to be decreased or increased from the first partition adjusting backlight brightness value to the static initial backlight brightness value at the ending stage.
FIG. 6 is a schematic diagram illustrating a variation of backlight brightness of a still picture in a narrow viewing angle display mode according to a first embodiment of the present invention. In this embodiment, in the narrow viewing angle display mode, if it is determined that a static image is displayed, the luminance value of the backlight emitted by each backlight partition is increased or decreased from the static initial backlight luminance value to the first partition adjusted backlight luminance value at the beginning, that is, the backlight luminance value of the backlight emitted by each backlight partition is transited from the backlight luminance value in the previous dynamic image to the first partition adjusted backlight luminance value obtained by using the area backlight luminance control technique, so that, as shown in fig. 6, the luminance of the bright area of the image is gradually increased to form an obviously over-bright area, and the luminance of the dark area of the image is gradually decreased to form an obviously over-dark area, which can enhance the contrast of the image. In the initial stage of the embodiment, because the picture is a static picture and the backlight brightness changes in a transition manner, screen flashing caused by too fast change of the picture brightness is avoided, and the method has the advantages of protecting the eyesight of a user and improving the user experience. Similarly, the brightness value of the backlight emitted by each backlight partition is decreased or increased from the first partition adjustment backlight brightness value to the static initial backlight brightness value at the ending stage, that is, the backlight brightness value of the backlight emitted by each backlight partition is transited from the first partition adjustment backlight brightness value obtained by adopting the area backlight brightness control technology to the backlight brightness value of the previous dynamic image, so that the brightness of the bright area of the image is gradually decreased, the brightness of the dark area of the image is gradually increased, and finally the brightness values of the backlight partitions are the same. In the ending stage of the embodiment, the picture is a static picture, and the backlight brightness changes in a transition manner, so that screen flashing caused by too fast change of the picture brightness is avoided, and the method has the advantages of protecting the eyesight of a user and improving the user experience.
In one embodiment, the step of sending the second adjustment instruction to the backlight driver includes: the backlight driver outputs current with the current value increasing or decreasing to the light-emitting lamp strings corresponding to the backlight subareas according to the second adjusting instruction, and the magnitude of the current received by the light-emitting lamp strings increases or decreases from the current value corresponding to the static initial backlight brightness value to the current value corresponding to the first subarea backlight brightness value; at the ending stage, the magnitude of the current received by the light-emitting lamp string is decreased or increased from the current value corresponding to the backlight brightness value adjusted by the first partition to the current value corresponding to the static initial backlight brightness value. The current received by the light-emitting lamp string changes in transition at the starting stage and the ending stage, so that the brightness value of the backlight sent by each backlight partition changes in transition, the change of the brightness of the picture is more continuous, and the watching comfort of a user can be improved.
In one embodiment, the step of making the luminance value of the backlight emitted by each backlight partition increase or decrease from the static initial backlight luminance value to the first partition adjustment backlight luminance value in the initial stage, and the step of decreasing or increasing from the first partition adjustment backlight luminance value to the static initial backlight luminance value in the end stage includes: and controlling the thin film transistor in the display panel to be in an open state for a plurality of times correspondingly in the starting stage and the ending stage, and displaying a plurality of frames of static pictures by the display panel according to picture data in the previous dynamic picture. Taking the starting stage of displaying the static image shown in fig. 6 as an example, the luminance values of the backlight partitions in the nth frame are all static initial backlight luminance values, and the luminance values of the backlight partitions in the (N + M + 1) th frame are first partition adjustment backlight luminance values, so that the backlight luminance values can be increased or decreased from the static initial backlight luminance values to the first partition adjustment backlight luminance values in M frames. If the minimum receiving current and the maximum receiving current of each string of the light-emitting lamp strings are set to be 0mA and 16mA respectively, and taking the example that the current of the light-emitting lamp string in one backlight partition is transited from 0mA corresponding to the static initial backlight brightness value to 16mA corresponding to the first partition backlight brightness value at the beginning stage, M may be set to 15, that is, 15 frames of static pictures may be set, and when the 15 frames of static pictures are displayed, the current of the light-emitting lamp string is transited from 0mA corresponding to the static initial backlight brightness value to 16mA corresponding to the first partition backlight brightness value, for example, the current may be 1mA, 2mA, … …, 14mA, 15mA respectively, and if the frame refresh rate is set to be 120Hz simultaneously, 125mS is consumed by the display of the 15 frames of static pictures, and the change perception of the picture brightness by the user may be. In the embodiment, when the display panel displays the initial stage and the end stage of the static image, the current on the light-emitting lamp string of each backlight partition is set to be correspondingly increased or decreased from the current value corresponding to the static initial backlight brightness value to the current value for adjusting the backlight brightness value of the first partition, so that the screen flash caused by too fast change of the image brightness is avoided, and the beneficial effects of protecting the vision of a user and improving the user experience are achieved.
In one embodiment, the determining whether the display mode is the wide viewing angle display mode or the narrow viewing angle display mode according to the mode selection signal includes: and S5, in the wide-viewing-angle display mode, calculating to obtain a second partition adjustment backlight brightness value corresponding to each backlight partition according to the gray-scale value of each backlight partition in the picture displayed by the display panel, and sending a third adjustment instruction to the backlight driver to make the brightness value of the backlight sent by each backlight partition be the second partition adjustment backlight brightness value. In this embodiment, when the display mode is in the wide viewing angle display mode, the luminance value of the backlight of each backlight partition can be adjusted by using the area backlight luminance control technology, so that the luminance value of the backlight emitted by each backlight partition is adjusted for the second partition, and the luminance of the bright area of the picture is higher and the luminance of the dark area of the picture is lower, thereby enhancing the contrast of the picture. In this embodiment, because the wide viewing angle display mode is compared with the narrow viewing angle display mode, the liquid crystal light leakage when displaying the dark area is small, and then the area with obviously too dark brightness cannot be formed, so that the area with obviously too dark brightness when moving on the picture is avoided during the wide viewing angle display mode, and the viewing experience of the user is improved.
In addition, the display driving method of the embodiment may be applicable to backlight adjustment of various backlight partition modes, such as lateral type backlight adjustment (1D Dimming), direct type area partition backlight adjustment (2D Dimming), and the like, so as to avoid an area with obviously too dark brightness when moving on a picture, and enhance contrast when a static picture is displayed, thereby improving viewing experience of a user.
In the display driving method provided by this embodiment, in the narrow viewing angle display mode, if it is determined that the display panel displays a dynamic picture, each backlight partition is controlled to emit backlights with the same brightness, so that an area with obviously too dark brightness does not appear on the picture; if the display panel is judged to display the static picture, the brightness value of the backlight emitted by each backlight partition is controlled to be the first partition to adjust the brightness value of the backlight, and even if an area with obviously too dark brightness appears in the picture, the area cannot move. Therefore, the method can still be applied to a high dynamic range technology and an area backlight brightness control technology in a narrow viewing angle display mode, avoids a moving area with obviously too dark brightness on a picture, and also enhances the contrast ratio in a static picture, thereby improving the watching experience of a user.
Second embodiment
Fig. 7 is a circuit diagram of the display driving circuit of the present embodiment. As shown in fig. 7, the display driving circuit includes a mode detection module 110, a frame determination module 120, and a backlight control module 130. The mode detection module 110 is configured to determine whether the display mode is the wide viewing angle display mode or the narrow viewing angle display mode according to the mode selection signal. The image determining module 120 is configured to determine whether image data sent by the display card 200 in a current frame is different from image data sent in a previous frame, determine that the display panel displays a dynamic image if the image data sent by the display card 200 in the current frame is different from the image data sent by the display card in the previous frame, and determine that the display panel displays a static image if the image data sent by the display card in the current frame is the same as. The backlight control module 130 is configured to, in the narrow viewing angle display mode, send a first adjustment instruction to the backlight driver 500 to enable each backlight partition to emit backlight with the same brightness if the display panel is determined to display a dynamic picture; if the display panel is judged to display the static picture, the gray-scale value of each backlight partition in the static picture is obtained to calculate the first partition adjustment backlight brightness value of each backlight partition, and a second adjustment instruction is sent to the backlight driver 500 to enable the brightness value of the backlight sent by each backlight partition to be the first partition adjustment backlight brightness value. The implementation of the display driving circuit can refer to the above embodiments of the display driving method, and repeated descriptions are omitted.
In one embodiment, the picture determining module 120 includes a PSR buffering module 121, which can receive and process buffered data, including current frame picture data and previous frame picture data sent by the graphics card 200.
In one embodiment, the timing controller 300 may include a receiving port 310, the picture data sent by the graphics card 200 may be received through the receiving port 310, and the receiving port 310 may be an eDP (embedded display port) receiving port 310; in one embodiment, the receiving port 310 may also receive a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE, and a clock signal CLK.
In one embodiment, the timing controller 300 may include a display output interface 320, and the timing controller 300 transmits the picture data to the source driver 400 through the display output interface 320.
In an embodiment, the timing controller 300 may include a pixel decoding and timing control module 330, where the pixel decoding and timing control module 330 may be configured to decode the picture data sent by the display card at the current frame and the picture data sent by the previous frame and received by the receiving port 310, and then send the decoded picture data to the PSR buffer module 121, and when the PSR buffer module 121 determines that the picture data sent by the display card 200 at the current frame is different from the picture data sent by the previous frame, the picture data sent by the display card 200 at the current frame is the picture data of the dynamic picture, and the pixel decoding and timing control module 330 connects the corresponding module of the timing controller 300 with the display card 200, and sends the picture data sent by the display card 200 at the current frame as the picture data of the current frame to the source driver 400, so that the display panel displays the dynamic picture; when the PSR buffer module 121 determines that the frame data sent by the display card 200 in the current frame is the same as the frame data sent in the previous frame, the pixel decoding and timing control module 330 disconnects the corresponding module of the timing controller 300 from the display card 200, and sends the buffered frame data of the previous dynamic frame as the frame data of the current frame to the source driver 400, so that the display panel displays a static frame.
In one embodiment, the backlight control module 130 may be connected to the backlight driver 500 through a Serial Peripheral Interface (SPI) Serial bus. The SPI serial bus is a high speed, full duplex, synchronous communication bus. Accordingly, the backlight control module 130 may transmit an SPI signal including a corresponding adjustment instruction (e.g., a first adjustment instruction, a second adjustment instruction, or a third adjustment instruction) to the backlight driver 500.
In addition, the display driving circuit of the present embodiment may be, but is not limited to be, disposed on the timing Controller 300, and may also be disposed on a Micro Controller Unit (MCU), for example.
In the display driving circuit of the present embodiment, in the narrow viewing angle display mode, if the frame determining module 120 determines that the display panel displays a dynamic frame, the backlight control module 130 controls each backlight partition to emit backlight with the same brightness, so that an area with obviously too dark brightness does not appear on the frame; if the image determination module 120 determines that the display panel displays a static image, the backlight control module 130 controls the luminance value of the backlight emitted by each backlight partition to be the first partition for adjusting the luminance value of the backlight, so that even if an area with significantly too dark luminance appears in the image, the area will not move. Therefore, the method can still be applied to a high dynamic range technology and an area backlight brightness control technology in a narrow viewing angle display mode, avoids a moving area with obviously too dark brightness on a picture, and also enhances the contrast ratio in a static picture, thereby improving the watching experience of a user.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A display driving method, characterized by comprising the steps of:
determining whether the display mode is a wide viewing angle display mode or a narrow viewing angle display mode according to the mode selection signal;
judging whether the picture data sent by the display card in the current frame is different from the picture data sent by the previous frame or not, if so, judging that the display panel displays a dynamic picture, and if so, judging that the display panel displays a static picture;
in the narrow viewing angle display mode, if the display panel is judged to display the dynamic picture, a first adjusting instruction is sent to a backlight driver to enable each backlight partition to send out backlight with the same brightness; if the display panel is judged to display the static picture, acquiring the gray-scale value of each backlight partition in the static picture to calculate and obtain a first partition adjustment backlight brightness value of each backlight partition, and sending a second adjustment instruction to the backlight driver to enable the brightness value of the backlight sent by each backlight partition to be the first partition adjustment backlight brightness value; wherein the content of the first and second substances,
the step of sending a first adjustment instruction to the backlight driver to make each backlight partition emit backlight with the same brightness comprises: and acquiring the gray-scale value of each backlight partition in the dynamic picture, calculating to obtain the average value of the gray-scale values of all the backlight partitions so as to determine the global uniform backlight brightness value, and sending the first adjusting instruction to the backlight driver so as to adjust the backlight partitions to emit backlight with the same brightness, wherein the brightness value of the backlight is the global uniform backlight brightness value.
2. The display driving method according to claim 1, wherein the determining whether the picture data sent by the graphics card in the current frame is different from the picture data sent by the graphics card in the previous frame comprises the steps of:
if the current frame is different from the current frame, the time sequence controller sends the frame data sent by the display card at the current frame to the source electrode driver as the current frame data so that the display panel displays a dynamic frame;
if the current frame is the same as the current frame, the time sequence controller sends the image data sent by the display card at the current frame to the source electrode driver as the current frame image data, so that the display panel displays a static image.
3. The display driving method according to claim 1, wherein the determining whether the picture data sent by the graphics card in the current frame is different from the picture data sent by the graphics card in the previous frame comprises the steps of:
if the current frame of the image data sent by the display card is different from the current frame of the image data sent by the display card, the time schedule controller is connected with the display card and sends the image data sent by the display card at the current frame of the image data as the current frame of the image data to the source electrode driver, so that the display panel displays the dynamic image;
if the current frame is the same as the current frame, the time sequence controller is disconnected with the display card and sends the cache picture data of the previous dynamic picture as the current frame picture data to the source electrode driver, so that the display panel displays a static picture.
4. The display driving method according to claim 1, wherein the step of sending the first adjustment instruction to the backlight driver to make each backlight partition emit backlight with the same brightness comprises: the first adjusting instruction is sent to the backlight driver to adjust the backlight with the same brightness sent by each backlight partition, and the brightness value of the backlight is kept unchanged in each frame.
5. The display driving method according to claim 1, wherein the step of sending the first adjustment instruction to the backlight driver to make each backlight partition emit backlight with the same brightness comprises: the backlight driver outputs the same current to the light-emitting lamp strings corresponding to the backlight partitions according to the first adjusting instruction;
the step of sending the second adjustment instruction to the backlight driver to enable the brightness value of the backlight emitted by each backlight partition to be the first partition adjustment backlight brightness value comprises: and the backlight driver outputs current corresponding to the backlight brightness value adjusted by the first partition to the light-emitting lamp strings corresponding to the backlight partitions according to the second adjusting instruction.
6. The display driving method according to claim 1, wherein if it is determined that the display panel displays a static picture, the step of obtaining the gray-scale value of each backlight partition in the static picture to calculate the first partition-adjusted backlight brightness value of each backlight partition, and sending the second adjustment instruction to the backlight driver comprises: and acquiring a static initial backlight brightness value of each backlight partition, wherein the backlight driver enables the brightness value of the backlight emitted by each backlight partition to be increased or decreased from the static initial backlight brightness value to the first partition regulation backlight brightness value in the starting stage according to the second regulation instruction, and is decreased or increased from the first partition regulation backlight brightness value to the static initial backlight brightness value in the ending stage.
7. The method of claim 6, wherein the step of increasing the brightness value of the backlight emitted by each backlight partition from the static initial backlight brightness value to the first partition adjusted backlight brightness value at the beginning stage and from the first partition adjusted backlight brightness value to the static initial backlight brightness value at the ending stage comprises: and controlling the thin film transistor in the display panel to be in an open state correspondingly for multiple times in the starting stage and the ending stage, and displaying multiple frames of static pictures by the display panel according to picture data in the previous dynamic picture.
8. The display driving method as claimed in claim 1, wherein the step of determining whether the display mode is the wide viewing angle display mode or the narrow viewing angle display mode according to the mode selection signal comprises:
and in the wide-view-angle display mode, calculating to obtain a second partition adjustment backlight brightness value corresponding to each backlight partition according to the gray-scale value of each backlight partition in the picture displayed by the display panel, and sending a third adjustment instruction to the backlight driver, so that the brightness value of the backlight sent by each backlight partition is the second partition adjustment backlight brightness value.
9. A display driving circuit, comprising:
a mode detection module (110), wherein the mode detection module (110) is used for judging whether the display mode is a wide view angle display mode or a narrow view angle display mode according to a mode selection signal;
the picture judging module (120), the picture judging module (120) is used for judging whether the picture data sent by the display card (200) in the current frame is different from the picture data sent by the previous frame, if so, the display panel is judged to display the dynamic picture, and if so, the display panel is judged to display the static picture;
the backlight control module (130) is configured to, in the narrow viewing angle display mode, if it is determined that the display panel displays a dynamic picture, obtain a gray scale value of each backlight partition in the dynamic picture, calculate an average value of the gray scale values of all the backlight partitions to determine a global uniform backlight brightness value, and send a first adjustment instruction to the backlight driver to adjust the backlights, which have the same brightness, sent by the backlight partitions, where the brightness value of the backlights is the global uniform backlight brightness value; if the display panel is judged to display the static picture, the gray-scale value of each backlight partition in the static picture is obtained to calculate and obtain the first partition adjustment backlight brightness value of each backlight partition, and a second adjustment instruction is sent to the backlight driver to enable the brightness value of the backlight sent by each backlight partition to be the first partition adjustment backlight brightness value.
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| CN111862895B (en) * | 2020-08-31 | 2021-08-31 | 广州朗国电子科技有限公司 | Global backlight energy consumption reduction method and device, storage medium and display equipment |
| CN114255713A (en) | 2020-09-24 | 2022-03-29 | 京东方科技集团股份有限公司 | Backlight module, display device and control method thereof |
| CN113327535A (en) * | 2021-05-31 | 2021-08-31 | Tcl华星光电技术有限公司 | Adjusting method and adjusting system for display picture of display panel |
| CN113870804B (en) * | 2021-10-18 | 2022-05-03 | 北京显芯科技有限公司 | Backlight control system, method, device and storage medium |
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| CN106205508A (en) * | 2016-09-22 | 2016-12-07 | 昆山龙腾光电有限公司 | Backlight adjusting method and backlight adjusting means for liquid crystal indicator |
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