CN113470568B - Brightness adjusting method of display panel, driving chip and display device - Google Patents
Brightness adjusting method of display panel, driving chip and display device Download PDFInfo
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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
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- 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]
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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
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
Abstract
The embodiment of the invention discloses a brightness adjusting method of a display panel, a driving chip and a display device, which are used for improving the phenomenon that an auxiliary display area of the display panel is dark in a low-brightness area. The brightness adjusting method comprises the following steps: and establishing a first corresponding relation of the mapping proportion between each brightness value and the maximum brightness value, wherein the mapping proportion value is a fixed value in a low-brightness interval. And establishing a second corresponding relation between each brightness value and the duty ratio of the pulse width modulation signal, wherein in a low-brightness interval, each brightness value is positively correlated with the duty ratio of the pulse width modulation signal. Acquiring a target brightness value; and under the condition that the target brightness value is in the low-brightness interval, determining a first mapping proportion value according to the target brightness value and the first corresponding relation. A first gamma voltage is determined according to the first mapping ratio value. And determining a first duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation. And adjusting the brightness displayed by the secondary display area of the display panel according to the first gamma voltage and the first duty ratio.
Description
Technical Field
The invention relates to the technical field of display, in particular to a brightness adjusting method of a display panel, a driving chip and a display device.
Background
With the continuous development of scientific technology, users have higher and higher pursuits on the screen occupation ratio (the ratio of the area of the display screen to the area of the front panel of the display device) of the display device.
Disclosure of Invention
An embodiment of the invention provides a brightness adjustment method for a display panel, a driving chip and a display device, which are used for improving a phenomenon that a sub-display area of the display panel is darkened in a low-brightness area.
In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:
in one aspect, an embodiment of the invention provides a brightness adjustment method for a display panel. The display panel has a display area including a main display area and a sub display area. The display panel can display a brightness range at least comprising a low-brightness section and a high-brightness section. The brightness adjusting method is used for adjusting the brightness displayed in the auxiliary display area. The brightness adjusting method comprises the following steps: and establishing a first corresponding relation of mapping proportions between each brightness value and the maximum brightness value, wherein in the first corresponding relation, in the low-brightness interval, the mapping proportion value is a constant value. And establishing a second corresponding relation between each brightness value and the duty ratio of the pulse width modulation signal, wherein in the second corresponding relation, each brightness value is positively correlated with the duty ratio of the pulse width modulation signal in the low-brightness interval. And acquiring a target brightness value. And under the condition that the target brightness value is in the low-brightness interval, determining a first mapping proportion value according to the target brightness value and the first corresponding relation. Determining a first gamma voltage according to the first mapping proportion value; the brightness value corresponding to the first gamma voltage is smaller than the maximum brightness value of the brightness range. And determining a first duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation. And adjusting the brightness displayed by the secondary display area of the display panel according to the first gamma voltage and the first duty ratio.
In some embodiments of the disclosure, a luminance range that can be displayed by the display panel is divided into sections, a first corresponding relationship between a mapping ratio of each luminance value and a maximum luminance value and a second corresponding relationship between each luminance value and a duty ratio of the pulse width modulation signal are established, the mapping ratio value in a low luminance section is set to be a fixed value, the duty ratios of each luminance value and the pulse width modulation signal are set to be positive correlations, and a first gamma voltage corresponding to different target luminance values in the low luminance section can be set to be a fixed value. Thus, when the target brightness value is obtained and the target brightness value is in the low brightness interval, the second sub-pixel can be provided with a (compared with the related art) larger first gamma voltage to enable the second sub-pixel to have larger display brightness, and meanwhile, the light-emitting time length of the second sub-pixel is adjusted through the pulse width modulation signal with the first duty ratio corresponding to the target brightness value, so that the display brightness of the sub-display area of the display panel is adjusted. Therefore, the brightness of the auxiliary display area can be prevented from being adjusted by changing the voltage value of the data signal, the influence of the resistance of the connecting wires on the adjustment of the display brightness of the auxiliary display area is improved, and the phenomenon that the display of the auxiliary display area is dark in a low-brightness interval can be improved.
In some embodiments, the determining a first gamma voltage according to the first mapping ratio value includes: and determining a first mapping brightness value according to the first mapping proportion value. And determining a first gray-scale value according to the first mapping brightness value. And determining the first gamma voltage according to the first gray-scale value.
In some embodiments, the first mapping ratio value is any one of 5% to 20% in the low luminance section.
In some embodiments, the low brightness interval comprises a first end point brightness value and a second end point brightness value; the first end luminance value is 0, and the second end luminance value is any one of 10% to 20% of the maximum luminance value.
In some embodiments, in a case where the target luminance value is the first end-point luminance value, the first duty ratio is any one of 5% to 15%. In a case where the target luminance value is the second end-point luminance value, the first duty ratio is 99%.
In some embodiments, in the first corresponding relationship, in the high brightness interval, each brightness value is positively correlated with a mapping ratio value. The brightness adjustment method further includes: and under the condition that the target brightness value is in the high-brightness interval, determining a second mapping proportion value according to the target brightness value and the first corresponding relation. And determining a second gamma voltage according to the second mapping proportion value. The brightness value corresponding to the second gamma voltage is smaller than the maximum brightness value of the brightness range.
In some embodiments, in the second corresponding relationship, the duty ratio of the pulse width modulation signal is constant in the high brightness interval. The brightness adjustment method further includes: and under the condition that the target brightness value is in the high-brightness interval, determining a second duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation. And adjusting the brightness displayed by the secondary display area of the display panel according to the second gamma voltage and the second duty ratio.
In some embodiments, the second duty cycle is 99%.
In another aspect, an embodiment of the present invention provides a driving chip for implementing a brightness adjustment method of a display panel according to any one of the above embodiments. The driving chip includes: the device comprises a receiving module, a processing module, a first output module and a second output module. The processing module stores a first corresponding relation of mapping proportions between each brightness value and the maximum brightness value and a second corresponding relation of each brightness value and the duty ratio of the pulse width modulation signal. In the first corresponding relation, in a low-brightness interval, the mapping proportion value is a fixed value; in the second corresponding relationship, in the low-luminance section, each luminance value is positively correlated with the duty ratio of the pulse width modulation signal. The receiving module is electrically connected with the display panel and the processing module; the receiving module is configured to: and acquiring a target brightness value and transmitting the target brightness value to the processing module. The processing module is also electrically connected with the first output module and the second output module; the processing module is configured to: judging the target brightness value, and determining a first mapping proportion value according to the target brightness value and the first corresponding relation under the condition that the target brightness value is in the low-brightness interval; determining a first gamma voltage according to the first mapping proportion value; and transmitting the first gamma voltage to the first output module; the brightness value corresponding to the first gamma voltage is smaller than the maximum brightness value of the brightness range. The first output module is also electrically connected with the display panel; the first output module is configured to transmit the first gamma voltage to the display panel. The processing module is further configured to: determining a first duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation; and transmitting the pulse width modulated signal having the first duty cycle to the second output module. The second output module is also electrically connected with the display panel; the second output module is configured to transmit a pulse width modulated signal having the first duty cycle to the display panel.
The beneficial effects that the driving chip can achieve are the same as those that the brightness adjusting method of the display panel in some embodiments can achieve, and are not described herein again.
In another aspect, an embodiment of the present invention provides a display device. The display device includes: a display panel; the driving chip is electrically connected with the display panel and is used for driving the display panel; and an optical device disposed on a non-light-emitting side of the display panel. The display panel has a display area including a main display area and a sub display area. The optical device is located in the sub display area. Wherein the display panel further has a frame region. The display panel includes: a plurality of sub-pixels; each sub-pixel comprises a pixel driving circuit and a light-emitting device electrically connected with the pixel driving circuit. The plurality of sub-pixels includes a plurality of first sub-pixels and a plurality of second sub-pixels. The plurality of first sub-pixels are positioned in the main display area; the light emitting device of each second sub-pixel is located in the sub-display area, and the pixel driving circuit of each second sub-pixel is located in the main display area or the frame area.
The beneficial effects that the display device can achieve are the same as those that the brightness adjusting method of the display panel in some embodiments can achieve, and are not described herein again.
Drawings
In order to more clearly illustrate the technical solutions in the present disclosure, the drawings needed to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art according to the drawings. Furthermore, the drawings in the following description may be regarded as schematic diagrams and are not intended to limit the actual size of products, the actual flow of methods, and the like, involved in the embodiments of the present disclosure.
FIG. 1 is a graph showing gray scale and voltage relationship at different display brightness according to the related art;
FIG. 2 is a diagram illustrating display effects of a display area of a display panel according to the related art;
FIG. 3 is a diagram illustrating display effects of display areas of a display panel according to some embodiments of the present invention;
FIG. 4 is a block diagram of a display device according to some embodiments of the invention;
FIG. 5 is a block diagram of another display device according to some embodiments of the invention;
FIG. 6 is a block diagram of a display panel according to some embodiments of the invention;
FIG. 7 is a block diagram of a display panel and a driver chip according to some embodiments of the invention;
FIG. 8 is a block diagram of a subpixel in accordance with some embodiments of the present invention;
FIG. 9 is a flow chart of a method for adjusting brightness of a display panel according to some embodiments of the invention;
FIG. 10 is a flowchart of S500 in the flowchart of FIG. 9;
FIG. 11 is a graph of a first correspondence and a second correspondence in accordance with some embodiments of the invention.
Detailed Description
Technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided by the present disclosure belong to the protection scope of the present disclosure.
Throughout the specification and claims, the term "comprising" is to be interpreted in an open, inclusive sense, i.e., as "including, but not limited to," unless the context requires otherwise. In the description herein, the terms "one embodiment," "some embodiments," "an example embodiment," "an example" or "some examples" or the like are intended to indicate that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure. The schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be included in any suitable manner in any one or more embodiments or examples.
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present disclosure, "a plurality" means two or more unless otherwise specified.
In describing some embodiments, the expression "connected" and its derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited to the contents herein.
Additionally, the use of "based on" means open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values may in practice be based on additional conditions or values beyond those stated.
Example embodiments are described herein with reference to cross-sectional and/or plan views as idealized example figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.
Some embodiments of the present invention provide a brightness adjustment method for a display panel, a driving chip 100 and a display device 1000. The following schematically describes a method for adjusting the brightness of the display panel, the driving chip 100, and the display device 1000.
In some embodiments, as shown in fig. 4 and 5, the display device 1000 may include: a display panel 200.
In some examples, as shown in fig. 5 and 6, the display panel 200 has a display area a and a bezel area B. Wherein the frame area B may be located at least one side of the display area a.
That is, the bezel area B may be located at one side, both sides, or three sides of the display area a. Of course, as shown in fig. 6, the frame area B may also surround the display area a.
The shape of the display area a may include various shapes, which is not limited in the present invention, and the shape may be set according to actual needs. Illustratively, the shape of the display area a may be circular, elliptical, or rectangular.
Illustratively, as shown in fig. 6, the display area a includes: a main display area a1 and a sub display area a 2. Wherein, the sub display area a2 may be located at the side of the main display area a 1. Alternatively, as shown in fig. 6, the sub display area a2 may be located inside the main display area a 1.
In some embodiments, as shown in fig. 4 and 5, the display device 1000 may further include: and an optical device 300 disposed on the non-light-emitting side of the display panel 200 and located in the sub-display area a 2.
The types of the optical device 300 include various types, and the arrangement can be selected according to actual needs. Illustratively, the optical device 300 includes a photosensitive device. For example, the light sensing device includes a camera or an infrared receiver or the like. Illustratively, the optical device 300 includes a light emitting device. For example, the light emitting device includes an infrared emitter.
By disposing the optical device 300 on the non-light-emitting side of the display panel 200 and disposing the optical device 300 in the sub-display area a2, the area occupied by the optical device 300 on the light-emitting side of the display apparatus 1000 can be reduced, and the screen occupation ratio of the display apparatus 1000 can be improved. Moreover, the light on the light emitting side of the display panel 200 may enter the optical device 300 through the sub-display area a2, or the light emitted by the optical device 300 may enter the light emitting side of the display panel 200 through the sub-display area a2, so that the optical device 300 can be normally used.
Here, the types of the display device 1000 include various types, and the setting can be selected according to actual needs. For example, the display device 1000 may be an OLED (Organic Light Emitting Diode) display device, a QLED (Quantum Dot Light Emitting Diode) display device, a Mini LED (Micro Light Emitting Diode) display device, or a Micro LED (Micro Light Emitting Diode) display device.
The following description schematically illustrates an example in which the display device 1000 is an OLED display device and the optical device 300 is a camera.
In some embodiments, as shown in fig. 6, the display panel 200 may include: a plurality of sub-pixels P. Each sub-pixel P includes a pixel driving circuit D and a light emitting device L electrically connected to the pixel driving circuit P1.
Based on the display apparatus 1000 being an OLED display apparatus, the light emitting device P2 may be an OLED.
The structure of the pixel driving circuit D includes various structures, and the arrangement can be selected according to actual needs. For example, the structure of the pixel driving circuit D may include structures such as "6T 1C", "7T 1C", "6T 2C" or "7T 2C". Here, "T" is represented as a transistor, the number located before "T" is represented as the number of transistors, "C" is represented as a storage capacitor, and the number located before "C" is represented as the number of storage capacitors.
Note that the pixel drive circuit D includes a drive transistor and at least one emission control transistor.
As shown in fig. 8, the pixel driving circuit D has a structure of 7T1C as an example. The pixel driving circuit D includes a driving transistor and two emission control transistors. The driving transistor may provide a driving signal (i.e., a driving current) to the corresponding light emitting device L according to a Data signal (the Data signal is from the Data signal terminal Data) input to the pixel driving circuit D, and the light emission controlling transistor may control on and off between the driving transistor and the light emitting device L under the control of an enable signal transmitted from the enable signal terminal EM. That is, the magnitude of the voltage value of the data signal may control the magnitude of the driving current supplied to the light emitting device L; the enable signal may control whether the driving current is transmitted to the light emitting device L and a duration of the driving current transmitted to the light emitting device L, that is, the enable signal may control whether the light emitting device L emits light and a duration of the light emitting device L.
Illustratively, the enable signal is a pulse width modulated signal. In one light emitting stage, by adjusting the duty ratio of the pulse width modulation signal, the time period for transmitting the driving current to the light emitting device L can be controlled, and thus the display brightness of the display panel 200 can be adjusted. For example, the higher the duty ratio of the pulse width modulation signal, the longer the light emitting duration of the corresponding light emitting device L in one light emitting phase, the higher the display brightness of the display panel 200. Conversely, the lower the display brightness of the display panel 200 will be.
For example, in one light emitting period, the magnitude of the driving current can be controlled by adjusting the voltage value of the data signal, so as to adjust the display brightness of the display panel 200. For example, the higher the voltage value of the data signal, the smaller the driving current, and the lower the light emitting luminance of the corresponding light emitting device L in one light emitting phase, the lower the display luminance of the display panel 200. Conversely, the higher the display brightness of the display panel 200 will be.
Here, the plurality of transistors included in the pixel driving circuit D shown in fig. 8 are P-type transistors, for example. In the case where the plurality of transistors included in the pixel driving circuit D are N-type transistors, the higher the voltage value of the data signal is, the larger the driving current is, the higher the light emitting luminance of the corresponding light emitting device L in one light emitting phase is, and the higher the display luminance of the display panel 200 is. Conversely, the lower the display brightness of the display panel 200 will be.
As can be seen from the above, the display luminance of the sub-pixel P and the display luminance of the display panel 200 are controlled by at least the data signal and the enable signal.
In some examples, as shown in fig. 6, the plurality of subpixels P may include: a plurality of first sub-pixels P1 and a plurality of second sub-pixels P2.
Illustratively, as shown in fig. 6, the plurality of first sub-pixels P1 are located in the main display area a 1. That is, the pixel driving circuits D and the light emitting devices L of the plurality of first sub-pixels P1 are located in the main display area a 1.
Illustratively, as shown in fig. 6, in the plurality of second sub-pixels P2, the light emitting device L of each second sub-pixel P2 is located in the sub-display area a2, and the pixel driving circuit D of each second sub-pixel P2 is located in the main display area a1 or the frame area B.
By disposing the first sub-pixel P1 in the main display area a1 and disposing the light emitting device L of each second sub-pixel P2 in the sub-display area a2, the display panel 200 and the display apparatus 1000 can realize full-screen display using the light emitting devices L of each first sub-pixel P1 and each second sub-pixel P2. By arranging the pixel driving circuit D of each second sub-pixel P2 in the main display area a1 or the frame area B, when external light passes through the portion of the display panel 200 located in the sub-display area a2 and enters the optical device 300, the pixel driving circuit D can be prevented from shielding the external light, so that the transmittance of the external light can be improved, and the amount of the external light received by the optical device 300 can be increased.
It should be noted that, as shown in fig. 6, after the pixel driving circuit D of each second sub-pixel P2 is disposed in the main display area a1 or the frame area B, a connecting trace C (made of, for example, ito, to avoid affecting the transmittance of external light) needs to be additionally disposed so as to connect the pixel driving circuit D and the corresponding light emitting device L, and further, the connecting trace C can transmit driving current to the light emitting device L.
For example, as shown in fig. 1, fig. 1 is a graph showing gray scale and voltage (i.e., voltage value of data signal) at different display luminances. In the same voltage change Δ V, the number of gray scales changed when the display luminance is 2nit (i.e., low luminance) is greater than the number of gray scales changed when the display luminance is 400nit (i.e., high luminance). At the same gray-scale variation Δ G, the voltage changed when the display luminance is 2nit (i.e., low luminance) is smaller than the voltage changed when the display luminance is 400nit (i.e., high luminance). That is, in the case where the display luminance is within the low luminance section, the display luminance is less sensitive to the change in the gray scale.
However, in each second sub-pixel P2, due to the existence of the connection trace C, and the connection trace C has resistance, the resistance between the pixel driving circuit D of the second sub-pixel P2 and the corresponding light emitting device L is increased. Thus, in the case where the pixel driving circuit D of the second sub-pixel P2 provides a driving circuit to the corresponding light emitting device L, the amount of driving current changed per unit amount of voltage change is small. In this way, when the display brightness is in the low brightness interval, the display brightness of the sub-display area a2 is less sensitive to the change of gray scale, as shown in fig. 2, and the phenomenon of the sub-display area a2 showing dark at low brightness is more obvious.
In some embodiments, the present invention provides a brightness adjusting method of a display panel, which is applied to the display panel 200 described above, for adjusting the brightness of the display of the sub-display area a2 of the display panel 200.
In some examples, the range of luminance that can be displayed by the display panel 200 includes at least a low luminance section and a high luminance section. As shown in fig. 11, the display panel 200 can display a brightness range including a minimum brightness value Qmin and a maximum brightness value Qmax.
Illustratively, as shown in fig. 11, the low luminance section includes a first end luminance value Q1 and a second end luminance value Q2. The high brightness section includes a third end brightness value Q3 and a fourth end brightness value Q4. The first end lighting value Q1 is smaller than the second end lighting value Q2, and the third end lighting value Q3 is smaller than the fourth end lighting value Q4.
The luminance range that can be displayed by the display panel 200 includes at least two luminance sections, and the at least two luminance sections can be divided according to actual situations.
Illustratively, the display panel 200 can display a luminance range including only a low luminance section and a high luminance section. At this time, the first end-point luminance value Q1 is the minimum luminance value Qmin, the second end-point luminance value Q2 is the same as the third end-point luminance value Q3, and the fourth end-point luminance value Q4 is the maximum luminance value Qmax.
Illustratively, the display panel 200 can display a luminance range including a low luminance section, a middle luminance section, and a high luminance section. At this time, the first end-point luminance value Q1 is the minimum luminance value Qmin, the second end-point luminance value Q2 is smaller than the third end-point luminance value Q3, and the fourth end-point luminance value Q4 is the maximum luminance value Qmax.
Of course, the range of the brightness displayed by the display panel 200 may be divided in other ways, which is not limited in the present invention.
In some embodiments, as shown in fig. 9, the brightness adjusting method of the display panel 100 includes S100 to S700.
S100, establishing a first corresponding relation of the mapping proportion between each brightness value and the maximum brightness value Qmax, wherein in the first corresponding relation, in a low-brightness interval, the mapping proportion value is a fixed value.
It should be noted that, in order to provide a good use experience for the user, a Display Brightness Value (DBV) for adjusting the Brightness of the Display panel 200 may be preset in the Display apparatus 1000, and the user may adjust the Brightness of the Display panel 200 by changing the Display Brightness Value. When the external light is strong, the DBV of the display panel 200 may be increased by the user, so that the user can clearly see the content displayed on the display panel 200; when the external light is weak, the DBV of the display panel 200 may be reduced by the user to avoid the user from being irritated by the eyes due to the too large difference between the external light and the brightness of the display panel 200.
There is typically a one-to-one correspondence between the preset DBV (no unit) and the actual luminance value (unit nit) of the display panel 200. For example, 12bits (i.e., 2 bits) is used for the DBV with the maximum practical brightness value of 500nit 12 4096 DBV values), wherein a DBV value of 4096 corresponds toThe maximum luminance value is 500 nit. Therefore, it can be understood that there is no essential difference between the "brightness value" and the "maximum brightness value" in the above-mentioned "establishing the first correspondence of the mapping ratio between each brightness value and the maximum brightness value Qmax" and "establishing the second correspondence of each brightness value and the duty ratio of the pulse width modulation signal" that are characterized by the actual brightness value or DBV.
Some embodiments of the present disclosure are schematically illustrated below by using the example of characterizing the above brightness values with DBV.
It will be appreciated that the value of DBV may also be, for example, 8bits (2) 8 256 DBV values) or 10bits (2) 10 1024 DVB values), the larger the value range of the DBV is, the smaller the actual brightness value changed for each DBV adjustment is, that is, the higher the actual brightness adjustment accuracy of the display panel 200 is.
For example, the range of brightness (i.e., DBV range) that can be displayed by the display panel 200 in the present invention is 12bits, and the maximum actual brightness value is 500 nit.
In some examples, the maximum brightness value Qmax may refer to a brightness value of the display panel 200 when a white screen (the white-most screen) is displayed and the gray scale is 255.
Here, the luminance values in the luminance range that can be displayed on the display panel 200 correspond to the mapped luminance values, respectively. The mapping ratio between each luminance value and the maximum luminance value Qmax is a percentage of a ratio between the mapped luminance value and the maximum luminance value Qmax. That is, the mapping ratio value is (mapping luminance value/maximum luminance value Qmax) × 100%.
In the low luminance section, the mapping ratio is a constant value. That is, in the low luminance section, the mapping ratio value does not change with a change in the luminance value, and the mapping luminance value does not change with a change in the luminance value.
The invention does not limit the mapping proportion value in the low-brightness interval and can select the mapping proportion value according to the actual requirement.
For example, in the low luminance section, the mapping ratio value (i.e., the first mapping ratio value) may be any one of 5% to 20%.
For example, in a low luminance region, the first mapping ratio value may be 5%, 10%, 11%, 15%, 17%, or 20%.
Taking the first mapping ratio value as 10%, in the low luminance interval, the mapping luminance values (i.e. the first mapping luminance values) corresponding to the luminance values are all 10% of the maximum luminance value Qmax. Wherein the first mapping luminance values are 4096 × 10% (or 50 nit).
For example, in the low luminance section, the first end-point luminance value Q1 may be 0. The second end luminance value Q2 may be any one of 10% to 20% of the maximum luminance value Qmax.
For example, the second end luminance value Q2 may be 10%, 12%, 15%, 19%, or 20% of the maximum luminance value Qmax.
For example, the second end-point luminance value Q2 may be 512 (or 62.5nit) taking the second end-point luminance value Q2 as 12.5% of the maximum luminance value Qmax.
S200, establishing a second corresponding relation between each brightness value and the duty ratio of the pulse width modulation signal, wherein in the second corresponding relation, in a low-brightness interval, each brightness value is positively correlated with the duty ratio of the pulse width modulation signal.
Illustratively, in the second correspondence, each luminance value corresponds to a duty value. In the low brightness interval, the duty ratio of the pulse width modulation signal increases with the increase of the brightness value, or the duty ratio of the pulse width modulation signal decreases with the decrease of the brightness value.
Here, the speed of the variation trend of the duty ratio of the pulse width modulation signal may be selectively set according to actual needs.
Illustratively, as shown in fig. 11, in the low-luminance interval, the duty ratio of the pulse width modulation signal and the variation between the luminance values are in a linear relationship.
And S300, acquiring a target brightness value.
The generation ways of the target brightness value include various ways, and the setting can be selected according to actual needs.
For example, a user may adjust the DBV through a DBV adjustment control provided by the display apparatus 1000; the display panel 200 may generate a brightness adjustment instruction according to the DBV adjustment control and obtain a target brightness value. For example, some display devices 1000 may use a volume key as a DBV adjustment control, and the value of the DBV may be increased or decreased by pressing the volume key.
For example, the user may manually input the value of the DBV through an input interface provided in the display device 1000. The display panel 200 may generate a brightness adjustment instruction according to the value of the DBV and acquire a target brightness value. The present invention is not limited to how a user interacts with the display device 1000 to adjust the DBV.
For example, referring to fig. 5, the display device 1000 displays a luminance bar in a luminance adjusting scene, where different positions of the luminance bar correspond to different luminance steps. The user slides the pointer in the intensity bar by hand to adjust the DBV. The display panel 200 may be capable of generating a brightness adjustment command according to the position of the pointer in the brightness bar and obtaining a target brightness value.
S400, under the condition that the target brightness value is in the low-brightness interval, determining a first mapping proportion value according to the target brightness value and the first corresponding relation.
After the target brightness value is obtained, the target brightness value may be compared with the first end-point brightness value Q1 and the second end-point brightness value Q2, and when the target brightness value is greater than or equal to the first end-point brightness value Q1 and the target brightness value is less than or equal to the second end-point brightness value Q2, the target brightness value is in the low brightness interval. At this time, the first mapping ratio value may be determined according to the target brightness value and the first correspondence relationship.
For example, the first mapping ratio value is 10%.
S500, determining a first gamma voltage according to the first mapping proportion value. The brightness value corresponding to the first gamma voltage is less than the maximum brightness value Qmax of the brightness range.
Illustratively, as shown in fig. 10, in the above S500, determining the first gamma voltage according to the first mapping ratio value includes: s510 to S530.
S510, determining a first mapping brightness value according to the first mapping proportion value.
After the first mapping ratio value is obtained, the first mapping ratio value may be multiplied by the maximum luminance value Qmax to determine the first mapping luminance value.
Illustratively, in the case where the first mapping proportion value is 10%, the first mapping brightness value is 4096 × 10% (or 50 nit).
Here, the first mapping brightness value is a brightness value corresponding to the first gamma voltage. The first mapped luminance value is smaller than the maximum luminance value Qmax of the luminance range.
S520, determining a first gray scale value according to the first mapping brightness value.
It should be noted that the gray scale is to divide the brightness variation between the brightest brightness and the darkest brightness that can be displayed by the display panel 200 into several parts, so as to control the brightness of the display panel 200. Each frame of the display screen displayed by the display panel 200 is formed by combining the colors displayed by the sub-pixels P. In general, each pixel may represent a different color, each color being composed of the three primary colors of red, green, and blue. Each pixel includes a plurality of sub-pixels P, for example, each pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. Each sub-pixel P may exhibit different brightness levels, and the gray levels represent gradation levels of different brightness from the darkest to the brightest. The more levels of different brightness from the darkest to the brightest, the more exquisite the picture effect can be presented.
Therefore, the brightness value and the gray scale have a determined corresponding relationship, so that a first gray scale value corresponding to the first mapping brightness value can be determined according to the first mapping brightness value.
S530, according to the first gray-scale value, a first gamma voltage is determined.
It should be noted that there is a certain corresponding relationship between the gray levels and the gamma voltages, and each gray level corresponds to a different gamma voltage. For example, as the gray scale increases, the gamma voltage also increases. Since the gray scale corresponding to the maximum brightness value Qmax of the brightness range is the maximum gray scale, the gamma voltage corresponding to the maximum brightness value Qmax is the maximum gamma voltage.
Illustratively, the maximum gamma voltage may be set to a constant value (e.g., 3000), for example. This facilitates better image quality compensation.
After the first gray scale value is determined, the first gamma voltage can be determined according to the corresponding relation.
Since the first mapping ratio is constant in the low brightness interval, the first mapping brightness value is constant, and the first gray scale value and the first gamma voltage are constant.
It should be noted that the Data signals transmitted by the Data signal terminal Data are generated according to gamma voltages, and the voltage value of each Data signal substantially corresponds to one gamma voltage, so that the voltage value of the Data signal can be represented by the gamma voltage. In case that the first gamma voltage is determined, a voltage value of the data signal transmitted to the pixel driving circuit D of the second subpixel P2 may be obtained.
In the related art, the voltage value of the Data signal transmitted by the Data signal terminal Data decreases with the increase of the brightness value, that is, each brightness value corresponds to a different voltage value of the Data signal. In the present invention, in the low luminance range (e.g., 0nit to 62.5nit or 0 to 512), the voltage value of the data signal corresponding to each luminance value is the voltage value of the data signal corresponding to the luminance value of 50nit (or 4096 × 10%). In the case where the target luminance value is less than 50nit (or 4096 × 10%), the voltage values of the data signals supplied to the pixel driving circuit D of the second sub-pixel P2 according to the present invention are each less than the voltage values of the data signals supplied in the related art.
S600, determining a first duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation.
It will be appreciated that in the case where the target brightness value is known, the first duty cycle of the pulse width modulated signal corresponding thereto may be obtained.
In the low brightness interval, the first duty ratio of the pwm signal may be set in various ways, which is not limited in the present invention.
For example, in the case where the target luminance value is the first end-point luminance value Q1, the first duty ratio may be any one of 5% to 15%.
For example, in the case where the target luminance value is the first end luminance value Q1, the first duty ratio may be 5%, 8%, 10%, 11%, or 15%.
For example, in the case where the target luminance value is the second end luminance value Q2, the first duty ratio may be 99%.
It is understood that, in the low brightness interval, as the target brightness value increases, the first duty ratio of the pulse width modulation signal also increases. Therefore, as the target luminance value increases, the period of time for which the driving current is transmitted to the light emitting device L may be increased, thereby increasing the display luminance of the second subpixel P2 and increasing the display luminance of the sub-display region a 2.
In the low luminance section, in the case where the target luminance value is greater than 50nit (or 4096 × 10%), the duty ratios of the pulse width modulation signals supplied to the pixel driving circuit D of the second sub-pixel P2 in the present invention are each greater than the duty ratio of the pulse width modulation signal supplied in the related art.
S700, the luminance displayed in the sub display area a2 of the display panel 100 is adjusted according to the first gamma voltage and the first duty ratio.
After the first gamma voltage and the first duty ratio are obtained, the corresponding data signal and the pulse width modulation signal with the first duty ratio can be transmitted to the pixel driving circuit D of the second sub-pixel P2, and the magnitude of the generated driving current and the light emitting duration of the light emitting device L are adjusted, so that the luminance displayed in the sub-display area a2 of the display panel 100 can be further displayed.
In the low luminance section, in the case where the target luminance value is less than 50nit (or 4096 × 10%), the voltage values of the data signals supplied to the pixel driving circuit D of the second sub-pixel P2 of the present invention are all smaller than the voltage values of the data signals supplied in the related art; in the case where the target luminance value is greater than 50nit (or 4096 × 10%), the duty ratios of the pulse width modulation signals supplied to the pixel driving circuit D of the second sub-pixel P2 according to the present invention are each greater than the duty ratio of the pulse width modulation signals supplied in the related art. Therefore, in the case where the target luminance value is less than 50nit (or 4096 × 10%), the data signal having a smaller voltage value (having a larger voltage absolute value) may be first supplied to the second subpixel P2, and thus the display duration of the second subpixel P2, and thus the display luminance of the second subpixel P2, may be adjusted by the pulse width modulation signal while the driving current is larger for the second subpixel P2. In the case that the target brightness value is greater than 50nit (or 4096 × 10%), the data signal with a slightly larger voltage value (with a smaller absolute value of the running voltage) may be first provided to the second sub-pixel P2, and then the pulse width modulation signal with a larger duty ratio may be provided while the driving current is slightly smaller to the second sub-pixel P2, so that the second sub-pixel P2 has a larger display duration, and thus the display brightness of the second sub-pixel P2 is adjusted.
In the case where the above-described brightness adjustment method is not employed, as shown in fig. 2, when the brightness is 2nit and the gray scale is 255, the screen of the sub display area a2 appears darker than that of the main display area a 1. In the case of the brightness adjustment method, as shown in fig. 3, when the brightness is 2nit and the gray scale is 255, the phenomenon of the sub-display area a2 showing dark images is significantly improved.
Therefore, in the brightness adjustment method of the display panel according to some embodiments of the present disclosure, the range of the brightness that can be displayed by the display panel 200 is divided into sections, a first corresponding relationship between the mapping ratio of each brightness value and the maximum brightness value Qmax and a second corresponding relationship between each brightness value and the duty ratio of the pulse width modulation signal are established, the mapping ratio value in the low brightness section is set as a fixed value, and the duty ratio of each brightness value and the duty ratio of the pulse width modulation signal are set as a positive correlation, so that the first gamma voltages corresponding to different target brightness values in the low brightness section can be set as fixed values. Thus, when the target brightness value is obtained and the target brightness value is in the low brightness interval, while the second sub-pixel P2 is supplied with a (compared with the related art) larger first gamma voltage to enable the second sub-pixel P2 to have a larger display brightness, the light emitting duration of the second sub-pixel P2 is adjusted by the pulse width modulation signal having the first duty ratio corresponding to the target brightness value, so as to adjust the display brightness of the sub-display area a2 of the display panel 200. Therefore, the brightness of the sub-display area A2 can be prevented from being adjusted by changing the voltage value of the data signal, the influence of the resistance of the connecting wire C on the adjustment of the display brightness of the sub-display area A2 is improved, and the phenomenon that the display of the sub-display area A2 is dark in a low-brightness interval can be improved.
In some embodiments, in the first corresponding relationship, in the high-luminance section, each luminance value is positively correlated with the mapping ratio value.
Illustratively, in the second correspondence relationship, each luminance value corresponds to one mapping ratio value (i.e., a second mapping ratio value). In the high brightness interval, the second mapping ratio value increases with the increase of the brightness value, or the second mapping ratio value decreases with the decrease of the brightness value.
Here, the speed of the change tendency of the second mapping ratio value may be set selectively according to actual needs.
Illustratively, as shown in fig. 11, in the high luminance section, the change between the second mapping ratio value and the luminance value is in a linear relationship.
In some examples, as shown in fig. 9, after S300 above, the brightness adjustment method further includes: s400 'to S500'.
S400', under the condition that the target brightness value is in the high-brightness interval, determining a second mapping proportion value according to the target brightness value and the first corresponding relation.
In the high-brightness interval, the brightness value and the mapping proportion value are in one-to-one correspondence, so that a second mapping proportion value can be obtained after the target brightness value is obtained.
S500', according to the second mapping proportion value, a second gamma voltage is determined. The brightness value corresponding to the second gamma voltage is less than the maximum brightness value Qmax of the brightness range.
The process of determining the second gamma voltage according to the second mapping ratio value may refer to the specific process of determining the first gamma voltage according to the first mapping ratio value in S510 to S530, and details thereof are not repeated herein.
In the high-brightness interval, since each brightness value is positively correlated with the mapping ratio value, the second gamma voltage gradually increases with the increase of the second mapping ratio value, and the voltage value of the corresponding data signal gradually decreases. Accordingly, as the second mapping ratio value increases, the light-emitting luminance of the light-emitting device L of the second sub-pixel P2 gradually increases.
In some embodiments, in the second correspondence, the duty ratio of the pulse width modulation signal is constant in the high brightness interval. That is, in the high-luminance section, the duty ratio of the pulse width modulation signal is kept constant as the luminance value changes. Accordingly, the light emitting period of the light emitting device L of the second sub-pixel P2 remains unchanged.
In some examples, as shown in fig. 9, the brightness adjustment method further includes: s600 'to S700'.
S600', under the condition that the target brightness value is in the high-brightness interval, determining a second duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation.
Illustratively, the second duty cycle is 99%.
S700', the brightness displayed in the sub display area a2 of the display panel 200 is adjusted according to the second gamma voltage and the second duty ratio.
It is understood that the value of the second duty ratio is large, so that the light emitting time period of the light emitting device L of the second sub-pixel P2 may be large. By making the duty ratio of the pulse width modulation signal constant, the light emission period of the light emitting device L can be made constant. This makes it possible to adjust the luminance of the sub-display area a2 display of the display panel 200 by changing the voltage value of the data signal transmitted to the second sub-pixel P2 while the light emitting device L of the second sub-pixel P2 has a large light emitting time period.
The above-mentioned step numbers are only for clearly explaining the contents of the steps, and do not limit the execution order of the steps. The invention can adjust the execution sequence of each step according to the requirement.
In some embodiments, as shown in fig. 7, an embodiment of the present invention provides a driving chip 100 for implementing a brightness adjustment method of a display panel according to any one of the above embodiments. Wherein, the driving chip 100 includes: the device comprises a receiving module 1, a processing module 2, a first output module 3 and a second output module 4.
Illustratively, the processing module 2 stores therein a first corresponding relationship of a mapping ratio between each brightness value and the maximum brightness value, and a second corresponding relationship of each brightness value and a duty ratio of the pulse width modulation signal. In the first correspondence relationship, the mapping ratio value is a constant value in the low luminance section. In the second correspondence, in the low-luminance section, each luminance value is positively correlated with the duty ratio of the pulse width modulation signal.
In some examples, as shown in fig. 7, the receiving module 1 is electrically connected with the display panel 200 and the processing module 2. Wherein the receiving module 1 is configured to: the target luminance value is acquired and transmitted to the processing module 2.
In some examples, as shown in fig. 7, the processing module 2 is also electrically connected with the first output module 3 and the second output module 4. Wherein the processing module 2 is configured to: judging the target brightness value, and determining a first mapping proportion value according to the target brightness value and the first corresponding relation under the condition that the target brightness value is in a low-brightness interval; determining a first gamma voltage according to the first mapping proportion value; and transmits the first gamma voltage to the first output module 3. The brightness value corresponding to the first gamma voltage is smaller than the maximum brightness value of the brightness range.
In some examples, as shown in fig. 7, the first output module 3 is also electrically connected to the display panel 200. Wherein the first output module 3 is configured to transmit the first gamma voltage to the display panel 200.
In some examples, the processing module 2 is further configured to: determining a first duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation; and transmits the pulse width modulated signal having the first duty ratio to the second output module 4.
In some examples, as shown in fig. 7, the second output module 4 is also electrically connected with the display panel 200. Wherein the second output module 4 is configured to transmit the pulse width modulation signal having the first duty ratio to the display panel 200.
The pixel driving circuit D of the second subpixel P2 in the display panel 200 may adjust the luminance of the sub display region a2 of the display panel 200 according to the first gamma voltage and the first duty ratio transmitted by the driving chip 100.
For a specific process of the functions that can be realized by the receiving module 1, the processing module 2, the first output module 3, and the second output module 4 in the driving chip 100, reference may be made to the description of the brightness adjustment method for the display panel, and details are not repeated here.
The beneficial effects that the driving chip 100 can achieve are the same as those that the brightness adjusting method of the display panel in some embodiments can achieve, and are not described herein again.
In some embodiments, as shown in fig. 5, the display device 1000 may further include the driving chip 100. The driving chip 100 may be electrically connected to the display panel 200.
In this way, the driving chip 100 may receive a brightness adjustment command generated by the display panel 200, obtain a target brightness value, determine the first gamma voltage and the first duty ratio (or the second gamma voltage and the second duty ratio), and then may transmit the first gamma voltage and the pulse width modulation signal having the first duty ratio (or the second gamma voltage and the pulse width modulation signal having the second duty ratio) to the display panel 200. The display panel 200 may adjust the display brightness of the sub display area a2 according to the first gamma voltage and the pulse width modulation signal having the first duty ratio.
The driving chip 100 may be located in the frame region B of the display panel 200, or may not be disposed on the display panel 200.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can appreciate that changes or substitutions within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The brightness adjusting method of the display panel is characterized in that the display panel is provided with a display area, and the display area comprises a main display area and an auxiliary display area; the main display area is positioned on at least one side of the auxiliary display area; the brightness range which can be displayed by the display panel at least comprises a low-brightness interval and a high-brightness interval; the brightness of the auxiliary display area is lower than that of the main display area; the brightness adjusting method is used for adjusting the brightness displayed by the auxiliary display area; the brightness adjusting method comprises the following steps:
establishing a first corresponding relation of mapping ratios between the brightness values and the maximum brightness value, wherein in the first corresponding relation, in the low-brightness interval, the mapping ratio value is a fixed value; in the high-brightness interval, each brightness value is positively correlated with the mapping proportion value;
establishing a second corresponding relation between each brightness value and the duty ratio of the pulse width modulation signal, wherein in the second corresponding relation, each brightness value is positively correlated with the duty ratio of the pulse width modulation signal in the low-brightness interval; in the high-brightness interval, the duty ratio of the pulse width modulation signal is a constant value;
acquiring a target brightness value;
in the case where the target brightness value is within the low brightness interval,
determining a first mapping proportion value according to the target brightness value and the first corresponding relation;
determining a first gamma voltage according to the first mapping proportion value; the brightness value corresponding to the first gamma voltage is smaller than the maximum brightness value of the brightness range;
determining a first duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation;
and adjusting the brightness displayed by the secondary display area of the display panel according to the first gamma voltage and the first duty ratio.
2. The method of claim 1, wherein the determining the first gamma voltage according to the first mapping ratio value comprises:
determining a first mapping brightness value according to the first mapping proportion value;
determining a first gray scale value according to the first mapping brightness value;
and determining the first gamma voltage according to the first gray-scale value.
3. The method of claim 1, wherein the first mapping ratio value is any one of 5% to 20% in the low luminance section.
4. The method according to claim 1, wherein the low-luminance section includes a first end-point luminance value and a second end-point luminance value;
the first end luminance value is 0, and the second end luminance value is any one of 10% to 20% of the maximum luminance value.
5. The method according to claim 4, wherein in the case where the target luminance value is the first end-point luminance value, the first duty ratio is any one of 5% to 15%;
in a case where the target luminance value is the second end-point luminance value, the first duty ratio is 99%.
6. The method of adjusting brightness of a display panel according to claim 1,
the brightness adjustment method further includes:
in the case where the target brightness value is within the high brightness interval,
determining a second mapping proportion value according to the target brightness value and the first corresponding relation;
determining a second gamma voltage according to the second mapping proportion value; the brightness value corresponding to the second gamma voltage is smaller than the maximum brightness value of the brightness range.
7. The brightness adjustment method of a display panel according to claim 6,
the brightness adjustment method further includes:
in the case where the target brightness value is within the high brightness interval,
determining a second duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation;
and adjusting the brightness displayed by the secondary display area of the display panel according to the second gamma voltage and the second duty ratio.
8. The method according to claim 7, wherein the second duty ratio is 99%.
9. A driving chip for implementing the method for adjusting luminance of a display panel according to any one of claims 1 to 8; the driving chip includes: the device comprises a receiving module, a processing module, a first output module and a second output module; the processing module stores a first corresponding relation of mapping proportions between each brightness value and the maximum brightness value and a second corresponding relation of each brightness value and the duty ratio of the pulse width modulation signal; in the first corresponding relation, in a low-brightness interval, the mapping proportion value is a constant value; in the second corresponding relation, in the low-brightness interval, each brightness value is positively correlated with the duty ratio of the pulse width modulation signal;
the receiving module is electrically connected with the display panel and the processing module; the receiving module is configured to: acquiring a target brightness value and transmitting the target brightness value to the processing module;
the processing module is also electrically connected with the first output module and the second output module; the processing module is configured to: judging the target brightness value, and determining a first mapping proportion value according to the target brightness value and the first corresponding relation under the condition that the target brightness value is in the low-brightness interval; determining a first gamma voltage according to the first mapping proportion value; and transmitting the first gamma voltage to the first output module; the brightness value corresponding to the first gamma voltage is smaller than the maximum brightness value of the brightness range;
the first output module is also electrically connected with the display panel; the first output module is configured to transmit the first gamma voltage to the display panel;
the processing module is further configured to: determining a first duty ratio of the pulse width modulation signal according to the target brightness value and the second corresponding relation; and transmitting a pulse width modulated signal having the first duty cycle to the second output module;
the second output module is also electrically connected with the display panel; the second output module is configured to transmit a pulse width modulated signal having the first duty cycle to the display panel.
10. A display device, comprising:
a display panel having a display area; the display area comprises a main display area and an auxiliary display area;
the driving chip of claim 9 electrically connected to the display panel; and the number of the first and second groups,
the optical device is arranged on the non-light-emitting side of the display panel and is positioned in the auxiliary display area;
the display panel is also provided with a frame area;
the display panel includes: a plurality of sub-pixels; each sub-pixel comprises a pixel driving circuit and a light-emitting device electrically connected with the pixel driving circuit;
the plurality of sub-pixels include a plurality of first sub-pixels and a plurality of second sub-pixels;
the plurality of first sub-pixels are positioned in the main display area;
the light emitting device of each second sub-pixel is located in the sub-display area, and the pixel driving circuit of each second sub-pixel is located in the main display area or the frame area.
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