CN113593474A - Gamma debugging method, display driving chip and display device - Google Patents
Gamma debugging method, display driving chip and display device Download PDFInfo
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- CN113593474A CN113593474A CN202110857077.0A CN202110857077A CN113593474A CN 113593474 A CN113593474 A CN 113593474A CN 202110857077 A CN202110857077 A CN 202110857077A CN 113593474 A CN113593474 A CN 113593474A
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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
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- 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
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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Abstract
The embodiment of the invention discloses a gamma debugging method, a display driving chip and a display device, wherein the gamma debugging method comprises the following steps: determining the black state voltage of the display device according to the brightness of the black picture displayed by the display device; determining a preceding-stage voltage corresponding to the black-state voltage according to the black-state voltage; and performing gamma adjustment on the display device according to the black state voltage and the preceding stage voltage. According to the technical scheme provided by the embodiment of the invention, different black state voltages are applied to different display devices according to different brightness of black pictures displayed by the different display devices, so that each display device can be in a black state, and the phenomenon that the black state of part of the display devices is not black enough due to the same black state voltage applied to the different display devices is avoided. Different black state voltages are applied to different display devices, so that the preceding stage voltages corresponding to the black state voltages are different, and the display device is favorable for reducing the power consumption of the display device in the driving display process.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a gamma debugging method, a display driving chip and a display device.
Background
An Organic Light Emitting Diode (OLED) display device has the characteristics of low production cost, self-luminescence, and the like, and has become a research hotspot in the current field.
In the prior art, the whole power consumption of the display device is large, and the phenomenon that the black state is not black exists.
Disclosure of Invention
The embodiment of the invention provides a gamma debugging method, a display driving chip and a display device, which are used for reducing the overall power consumption of the display device and improving the black state display effect.
In a first aspect, an embodiment of the present invention provides a gamma debugging method, including:
determining the black state voltage of the display device according to the brightness of a black picture displayed by the display device;
determining a preceding stage voltage corresponding to the black state voltage according to the black state voltage;
and carrying out gamma regulation on the display device according to the black state voltage and the preceding stage voltage.
Optionally, determining a black-state voltage of the display device according to the brightness of the black picture displayed by the display device includes:
acquiring a first gray scale voltage corresponding to the display device when the display device displays a black picture;
and when the black picture brightness of the display device under the first gray scale voltage meets the preset brightness, determining the first gray scale voltage as the black state voltage.
Optionally, the first grayscale voltage is a threshold voltage corresponding to a black frame displayed by the display device.
Optionally, the preset luminance is less than or equal to 0.002 nit.
Optionally, if the black picture of the display device under the first gray scale voltage does not meet the preset brightness, correcting the first gray scale voltage by a preset voltage gradient to obtain a second gray scale voltage;
and determining the second gray scale voltage as the black state voltage until the black picture brightness of the display device meets the preset brightness.
Optionally, the preset voltage gradient is 0.1V.
Optionally, a difference between the previous stage voltage and the black state voltage ranges from 0.2V to 0.3V.
Optionally, the gamma adjusting the display device according to the black state voltage and the previous stage voltage comprises:
determining the brightness and the gray scale corresponding to the bright-state voltage according to the bright-state voltage corresponding to the display device when the display device displays a white picture, and determining the brightness and the gray scale corresponding to the black-state voltage according to the black-state voltage;
determining target brightness corresponding to the gray scale to be adjusted;
and gamma adjustment is carried out on the display device by taking the preceding-stage voltage, the black-state voltage and the bright-state voltage as reference values so as to achieve the corresponding target brightness.
In a second aspect, an embodiment of the present invention further provides a display driving chip disposed in a display device, where the display driving chip includes:
the voltage acquisition module is used for determining the black state voltage of the display device according to the brightness of a black picture displayed by the display device;
the voltage calculation module is used for determining a preceding stage voltage corresponding to the black state voltage according to the black state voltage;
and the gamma adjusting module is used for carrying out gamma adjustment on the display device according to the black state voltage and the preceding stage voltage.
In a third aspect, an embodiment of the present invention further provides a display device, where the display device includes the display driver chip provided in any embodiment of the present invention.
According to the technical scheme provided by the embodiment of the invention, the black state voltage of the display device is determined according to the brightness of the black picture displayed by the display device, the preceding stage voltage corresponding to the black state voltage is determined according to the obtained black state voltage, and the gamma adjustment is carried out on the display device according to the black state voltage and the preceding stage voltage. Compared with the prior art, the technical scheme provided by the embodiment of the invention applies different black state voltages to different display devices according to different brightness when different display devices display black pictures, so that each display device can be in a black state, and the phenomenon that the black state of part of the display devices is not black enough due to the fact that the same black state voltage is applied to different display devices is avoided. Because different black-state voltages are applied to different display devices, the preceding-stage voltages corresponding to the black-state voltages are different, and the display device is driven to reduce the power consumption of the display device in the display process.
Drawings
FIG. 1 is a flowchart of gamma debugging according to an embodiment of the present invention;
FIG. 2 is a flow chart of another gamma debugging method according to an embodiment of the present invention;
FIG. 3 is a flow chart of another gamma debugging method according to an embodiment of the present invention;
FIG. 4 is a flow chart of another gamma debugging method according to an embodiment of the present invention;
FIG. 5 is a power consumption graph according to an embodiment of the present invention;
FIG. 6 is a flow chart of another gamma debugging method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display driver chip according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background art, the display device in the prior art has large overall power consumption and has a phenomenon that the black state is not black. The inventor researches and finds that the problems are caused by the fact that in the actual production process, when parameters (such as black state voltage parameters) are set aiming at different display devices, the black state voltage parameters adopted under the same item are the same, and the set black state voltage parameters are not matched with the black state voltage required by the display devices due to the difference among the different display devices, so that the overall power consumption of the display devices is large, and the brightness of black pictures of the display devices is not black enough under the black state voltage which is not matched.
In view of the above problem, an embodiment of the present invention provides a gamma debugging method, and fig. 1 is a flowchart of the gamma debugging method provided in the embodiment of the present invention, and referring to fig. 1, the gamma debugging method includes:
and S110, determining the black state voltage of the display device according to the brightness of the black picture displayed by the display device.
Specifically, the black state voltage may be defined as a data voltage corresponding to a gray level of a black frame displayed by the display device within a certain gray level range. The display device includes a pixel circuit for driving a pixel to emit light for display, and the pixel circuit generally includes a thin film transistor and a storage capacitor. Due to the limitation of the crystallization process, when a thin film transistor is fabricated on a large-area glass substrate, non-uniformity often exists in parameters such as threshold voltage and electron mobility of the thin film transistor, thereby causing current difference and brightness difference of the OLED display device. Therefore, for different display devices, the corresponding brightness is not exactly the same when displaying black images under the same black state voltage. Therefore, under the condition that the display device itself has a difference, the black state voltage of the display device can be determined according to the brightness of the black frame displayed by the display device. Taking simulation as an example, the display device is simulated, and the corresponding black state voltage is determined according to the brightness of the displayed black picture obtained by the simulation. In this embodiment, the black state voltage is determined according to the brightness of the display device displaying the black image, that is, the corresponding black state voltage is set according to the parameter difference of different display devices. Therefore, the phenomenon that the black state of the display device is not black enough can be avoided.
And S120, determining a previous stage voltage corresponding to the black state voltage according to the black state voltage.
Specifically, after the black state voltage of the display device is determined, the preceding stage voltage corresponding to the black state voltage is determined according to the magnitude of the obtained black state voltage. The previous voltage is determined to ensure that the data voltage output by the driver chip to the pixel is the black voltage obtained in step S110. Therefore, the preceding stage voltage is larger than the black state voltage in consideration of the loss. The specific calculation method of the preceding stage voltage can be calculated according to the requirement of the driving chip, and is not described herein again. Since the preceding-stage voltage is associated with the black-state voltage, when the black-state voltage corresponding to the display device is lowered for the same display device, the corresponding preceding-stage voltage is necessarily lowered. It is understood that when the voltage of the front stage of the display device is lowered, the driving force required for the driving chip is small, and thus the power consumption of the display device can be reduced. That is, the lower the black state voltage of a display device, the lower the voltage of the previous stage, and the lower the power consumption. For example, in the prior art, assuming that n display devices are produced, and the black state voltage applied to different display devices is 5.8V, so as to ensure that the proportion of the display devices in the batch satisfying the requirement of black enough is 98%, the previous stage voltage is the same, and the power consumption of each display device is Q1 … … Qn. In the present embodiment, the corresponding black state voltage is determined according to the brightness of the black frame displayed by each display device, and the corresponding previous stage voltage of different display devices is determined according to the black state voltage, so that under the same condition of ensuring the same black state ratio (98%), the previous stage voltage corresponding to the black state voltage is reduced due to the reduction of the black state voltage, and the power consumption of the corresponding display device is also reduced.
The power consumption of the display device is equal to the product of the voltage (preceding stage voltage) and the current, the working current of each display device is fixed under the same display picture for a plurality of display devices, and if a certain display device can realize the black state under the condition that the voltage is 5.6V, the black state voltage of the certain display device does not need to be set to be 5.8V, and the production requirement can be met only by setting the black state voltage to be 5.6V. Thereby, power consumption of the display device can be reduced. For example, if the black state voltage of the first display device is 5.2V and the power consumption is P1, P1 < Q1; the second display device has a corresponding black state voltage of 5.4V and power consumption of P2, and P2 is less than Q2.
And S130, carrying out gamma regulation on the display device according to the black state voltage and the previous stage voltage.
Specifically, after the black state voltage of the display device and the preceding stage voltage corresponding to the black state voltage are determined, gamma adjustment is performed according to the black state voltage to determine data voltages (gray scale voltages) corresponding to different gray scales, and the obtained black state voltage, the data voltages corresponding to the different gray scales and the preceding stage voltage corresponding to the black state voltage are burned into the driving chip to ensure the display effect of the display device. In this embodiment, the maximum voltage supportable by the driver chip is the preset previous voltage, after the black voltage is determined in step S110 and the previous voltage corresponding to the black voltage is determined in step S120, the previous voltage is called during the display process of the display device by reducing the preset previous voltage to the voltage value of the obtained previous voltage, and the corresponding black voltage is generated by the previous voltage, so as to obtain the gray voltage corresponding to each gray scale for driving and displaying. For example, if the black state voltage of the first display device is determined to be 5.2V, the brightness of the gray scale to be adjusted is determined according to the relationship between the gray scale and the brightness within the voltage range smaller than 5.2V, different brightness levels correspond to different gamma curves, the display brightness corresponding to different gray scales and different data voltages corresponding to different display brightness can be determined from the gamma curves, and therefore, the data voltage of the gray scale to be adjusted can be determined according to the gamma curves. Of course, in other embodiments, the adjustment range of the data voltage may further include a minimum value, and the minimum value may be a bright-state voltage when the display device displays a white image, so that the adjustment range of the data voltage corresponding to different gray scales may be between the bright-state voltage and the black-state voltage.
According to the gamma debugging method provided by the embodiment of the invention, the black state voltage of the display device is determined according to the brightness of the black picture displayed by the display device, the previous stage voltage corresponding to the black state voltage is determined according to the obtained black state voltage, and the gamma regulation is carried out on the display device according to the black state voltage and the previous stage voltage. Compared with the prior art, the technical scheme provided by the embodiment of the invention applies different black state voltages to different display devices according to different brightness when different display devices display black pictures, so that each display device can be in a black state, and the phenomenon that the black state of part of the display devices is not black enough due to the fact that the same black state voltage is applied to different display devices is avoided. Since different black state voltages are applied to different display devices, the preceding stage voltages corresponding to the black state voltages are different, which is beneficial to reducing the power consumption of the display device in the process of driving the display device to display.
Fig. 2 is a flowchart of another gamma adjustment method according to an embodiment of the present invention, and referring to fig. 2, based on the above technical solution, the gamma adjustment method according to the embodiment of the present invention includes:
s210, acquiring a first gray scale voltage corresponding to the display device displaying the black picture.
Specifically, the first gray scale voltage is a threshold voltage corresponding to the display device displaying the black frame, that is, when the first gray scale voltage is applied to the display device, the display device can just display the black frame. In this embodiment, the first gray scale voltage is a limit value at which the display device displays a black frame, and for the pixel circuit formed by the P-type thin film transistor, the first gray scale voltage is a minimum voltage value at which the display device can display the black frame. The first gray scale voltage can be determined according to a simulation result or obtained according to actual measurement data of the display device.
S220, when the brightness of the black picture of the display device under the first gray scale voltage meets the preset brightness, determining the first gray scale voltage as a black state voltage.
Specifically, after the first gray scale voltage of the black state of the display device is determined, whether the brightness of the black picture displayed by the display device under the first gray scale voltage meets the preset brightness is judged, and if the brightness meets the preset brightness, the first gray scale voltage at the moment is determined to be the black state voltage of the display device. The preset brightness is less than or equal to 0.002nit, and when the display device enables the brightness of a displayed black picture to be less than or equal to 0.002nit under the first gray scale voltage, the black state of the display device can be determined to meet the requirement, so that the first gray scale voltage is determined to be the black state voltage, and the phenomenon that the black state is not black enough can be avoided.
And S230, determining a previous stage voltage corresponding to the black state voltage according to the black state voltage.
And S240, carrying out gamma regulation on the display device according to the black state voltage and the previous stage voltage.
Fig. 3 is a flowchart of another gamma adjustment method according to an embodiment of the present invention, and fig. 4 is a flowchart of another gamma adjustment method according to an embodiment of the present invention, where on the basis of the above technical solutions, referring to fig. 3 and fig. 4, the gamma adjustment method according to an embodiment of the present invention includes:
s310, acquiring a first gray scale voltage corresponding to the display device displaying the black picture.
S320, if the black picture of the display device under the first gray scale voltage does not meet the preset brightness, correcting the first gray scale voltage by using a preset voltage gradient to obtain a second gray scale voltage.
S330, determining the second gray scale voltage as a black state voltage until the brightness of the black picture of the display device meets the preset brightness.
Specifically, when the first gray scale voltage cannot enable the display device to display the black picture, the first gray scale voltage is increased to obtain the first gray scale voltage, whether the second gray scale voltage can enable the display device to display the black picture, the luminance of the display device to display the black picture, is less than or equal to 0.002nit is determined, if the second gray scale voltage does not meet the preset luminance, the current second gray scale voltage is continuously increased as the first gray scale voltage to obtain the second gray scale voltage, and the second gray scale voltage is determined to be the black state voltage until the second gray scale voltage can enable the luminance of the black picture of the display device to be less than or equal to 0.002 nit. The principle of increasing the first gray scale voltage is as follows: the first gray scale voltage is corrected by a preset voltage gradient of 0.1V. Illustratively, the first gray scale voltage of a display device is 5V obtained through simulation, but the brightness of a black picture of the display device is greater than 0.002nit under the first gray scale voltage of 5V, and the preset brightness is not met. Therefore, the first gray scale voltage is increased to 5.1V, if the brightness of the black frame of the display device is still greater than 0.002nit, the first gray scale voltage is continuously increased to 5.2V, and if the brightness of the black frame of the display device is less than or equal to 0.002nit, 5.2V is determined as the black state voltage of the display module.
And S340, determining a previous stage voltage corresponding to the black state voltage according to the black state voltage.
And S350, carrying out gamma regulation on the display device according to the black state voltage and the previous stage voltage.
In this embodiment, the minimum gray scale voltage value (the first gray scale voltage) when the display device displays the black image is determined, and then the gray scale voltage when the luminance of the display device displaying the black image is less than or equal to 0.002nit is determined as the black state voltage of the display device in a manner of gradually increasing the minimum gray scale voltage by a preset voltage gradient. In this way, the optimal black state voltage for the display device to be in the black state mode satisfying the requirements can be obtained, and the determination method is simple.
Further, after the black state voltage of the display device is obtained in the above manner, the preceding stage voltage of the black state voltage is calculated according to the requirement of the driving chip. In the present embodiment, the difference between the previous stage voltage and the black state voltage ranges from 0.2V to 0.3V. For example, if the black state voltage is 5.2V, the previous stage voltage corresponding to the black state voltage is 5.4V to 5.5V. Compared with the prior art, the power consumption of the display device can be reduced to a certain extent. Fig. 5 is a power consumption graph according to an embodiment of the present invention, and referring to fig. 5, the dashed line represents power consumption of the display devices 1 to 8 under the same black state voltage (in order to satisfy that most display devices are in a black state satisfying the requirement, the black state voltage is large enough, such as 5.8V), and the solid line represents power consumption of the display devices 1 to 8 under different black state voltages, and the black state voltage is obtained by the method provided in any of the embodiments. As can be seen from fig. 5, when different black state voltages are applied to the luminances of black images displayed on the respective display devices, the previous stage voltages corresponding to the respective black state voltages are different from each other, and the power consumption of the display devices can be reduced to different extents, as compared with the case where the same black state voltage is applied to the different display devices.
Fig. 6 is a flowchart of another gamma adjustment method according to an embodiment of the present invention, and referring to fig. 6 on the basis of the foregoing technical solutions, the gamma adjustment method according to the embodiment of the present invention includes:
s410, acquiring a first gray scale voltage corresponding to the display device displaying the black picture.
S420, when the brightness of the black picture of the display device under the first gray scale voltage meets the preset brightness, determining that the first gray scale voltage is a black state voltage.
S430, if the black picture of the display device under the first gray scale voltage does not meet the preset brightness, correcting the first gray scale voltage by a preset voltage gradient to obtain a second gray scale voltage.
And S440, determining the second gray scale voltage as a black state voltage until the black frame brightness of the display device meets the preset brightness.
And S450, determining a previous stage voltage corresponding to the black state voltage according to the black state voltage.
S460, determining the brightness and the gray scale corresponding to the bright-state voltage according to the bright-state voltage corresponding to the white image displayed by the display device, and determining the brightness and the gray scale corresponding to the black-state voltage according to the black-state voltage.
Specifically, the bright-state voltage of the display device may be determined according to the customer requirement and the product characteristic, where the bright-state voltage is a maximum grayscale voltage (smaller than the black-state voltage) corresponding to when the display device just displays a white frame. And simultaneously determining the brightness and the gray scale corresponding to the black state voltage, and determining a gamma curve corresponding to the brightness level according to the brightness and the gray scale of the white picture displayed by the display device and the brightness and the gray scale of the black picture displayed by the display device.
S470, determining the target brightness corresponding to the gray scale to be adjusted.
After the corresponding gamma curve is determined, the target brightness corresponding to the gray scale to be adjusted can be determined according to the display brightness corresponding to the maximum gray scale, for example, the target brightness corresponding to any gray scale can be calculated according to the following formula,
Lv_Gray＝Lv_Gmax*(xn/Gmax)γ，
wherein Lv _ Gray represents target brightness corresponding to the Gray scale to be adjusted, Lv _ Gmax represents display brightness corresponding to the maximum Gray scale, and xnThe gray scale to be adjusted is represented, Gmax represents the maximum gray scale, and γ is a constant, specifically, the relationship between the display brightness and the gray scale usually satisfies the curve relationship of gamma 2.2, so the value of γ can be 2.2. For example, the display gray scale of the display device is 0-255, the display brightness corresponding to the gray scale of 255 is 450nit, and the display brightness corresponding to the gray scale to be adjusted 223 is (223/255) ^2.2 × 450 ^ 335.038577 nit.
And S480, gamma adjustment is carried out on the display device by taking the previous-stage voltage, the black-state voltage and the bright-state voltage as reference values so as to achieve the corresponding target brightness.
After the target brightness corresponding to the gray scale to be adjusted is obtained through calculation, the data voltage value in the register corresponding to the gray scale in the driving chip is adjusted within the range by taking the front-level voltage, the black-state voltage and the bright-state voltage as reference values until the brightness of the display device is adjusted to the target brightness corresponding to the gray scale to be adjusted, the obtained data voltage is the gray scale voltage corresponding to the target brightness, and the data voltage is burned into the driving chip. In this embodiment, the maximum voltage supportable by the driver chip is the preset previous voltage, and after the black state voltage and the previous voltage corresponding to the black state voltage are determined, the preset previous voltage is reduced to the voltage value of the obtained previous voltage, so that the previous voltage can generate a stable black state voltage. In the display process of the display device, the preceding stage voltage is called, the corresponding black state voltage is generated through the preceding stage voltage, and the gray scale voltage corresponding to each gray scale is obtained. For example, the voltage is gradually reduced at the display brightness corresponding to the black state voltage, and when the display brightness reaches the target brightness, the voltage at the moment is determined to be the data voltage corresponding to the gray scale to be adjusted.
Fig. 7 is a schematic structural diagram of a display driver chip according to an embodiment of the present invention, and referring to fig. 7, the display driver chip 100 is disposed in a display device, and includes:
the voltage acquisition module 11 is configured to determine a black-state voltage of the display device according to the brightness of a black picture displayed by the display device;
the voltage calculation module 12 is configured to determine a previous-stage voltage corresponding to the black-state voltage according to the black-state voltage;
and a gamma adjusting module 13 for performing gamma adjustment on the display device according to the black state voltage and the previous stage voltage.
Specifically, the black state voltage may be defined as a data voltage corresponding to a gray level of a black frame displayed by the display device within a certain gray level range. The display device includes a pixel circuit for driving a pixel to emit light for display, and the pixel circuit generally includes a thin film transistor and a storage capacitor. Due to the limitation of the crystallization process, when a thin film transistor is fabricated on a large-area glass substrate, non-uniformity often exists in parameters such as threshold voltage and electron mobility of the thin film transistor, thereby causing current difference and brightness difference of the OLED display device. Therefore, for different display devices, the corresponding brightness is not exactly the same when displaying black images under the same black state voltage. Therefore, under the condition that the display device itself has a difference, the voltage obtaining module 11 may obtain the black state voltage of the display device according to the brightness of the black frame displayed by the display device. Taking simulation as an example, the display device is simulated, and the voltage obtaining module 11 determines the corresponding black state voltage according to the brightness of the displayed black picture obtained by the simulation. In this embodiment, the black state voltage is determined according to the brightness of the display device displaying the black image, that is, the corresponding black state voltage is set according to the parameter difference of different display devices, so that the phenomenon that the display device is not black enough can be avoided.
After determining the black state voltage of the display device, the voltage calculating module 12 determines a previous stage voltage corresponding to the black state voltage according to the obtained black state voltage, wherein the previous stage voltage can be calculated according to the design requirement of the display driving chip 100. Since the preceding stage voltage is correlated with the black state voltage, when the black state voltage corresponding to the display device is lowered, the corresponding preceding stage voltage is necessarily lowered for the same display device. That is, the lower the black state voltage of a display device, the lower the voltage of the previous stage, and the lower the power consumption.
After determining the black state voltage of the display device and the previous stage voltage corresponding to the black state voltage, the gamma adjusting module 13 performs gamma adjustment according to the black state voltage and the previous stage voltage to determine the data voltages corresponding to different gray scales to ensure the display effect of the display device. In this embodiment, the maximum voltage supportable by the driver chip is the preset previous voltage, and after the black state voltage and the previous voltage corresponding to the black state voltage are determined, the preset previous voltage is reduced to the voltage value of the obtained previous voltage, so that the previous voltage can generate a stable black state voltage. In the display process of the display device, the preceding stage voltage is called, the corresponding black state voltage is generated through the preceding stage voltage, and the gray scale voltage corresponding to each gray scale is obtained through the black state voltage so as to drive and display. For example, if the black state voltage of the first display device is determined to be 5.2V, the brightness of the gray scale to be adjusted is determined according to the relationship between the gray scale and the brightness within the voltage range smaller than 5.2V, different brightness levels correspond to different gamma curves, the display brightness corresponding to different gray scales and different data voltages corresponding to different display brightness can be determined from the gamma curves, and therefore, the data voltage of the gray scale to be adjusted can be determined according to the gamma curves.
According to the display driving chip provided by the embodiment of the invention, the voltage obtaining module is used for determining the black state voltage of the display device according to the brightness of the black picture displayed by the display device, the voltage calculating module is used for calculating the preceding stage voltage corresponding to the black state voltage according to the black state voltage obtained by the voltage obtaining module, and then the gamma regulating module is used for carrying out gamma regulation on the display device according to the black state voltage and the preceding stage voltage. Compared with the prior art, the technical scheme provided by the embodiment of the invention applies different black state voltages to different display devices according to different brightness when different display devices display black pictures, so that each display device can be in a black state, and the phenomenon that the black state of part of the display devices is not black enough due to the fact that the same black state voltage is applied to different display devices is avoided. Because different black-state voltages are applied to different display devices, the preceding-stage voltages corresponding to the black-state voltages are different, and the display device is driven to display, so that the power consumption of the display device is reduced.
Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 8, an embodiment of the present invention further provides a display device, where the display device may be an electronic product device such as a mobile phone, a flat panel, a television, an intelligent wearable device, and the display device includes a display driver chip according to any embodiment of the present invention, so that the display device according to the embodiment of the present invention also has the beneficial effects described in any embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A gamma debugging method, comprising:
determining the black state voltage of the display device according to the brightness of a black picture displayed by the display device;
determining a preceding stage voltage corresponding to the black state voltage according to the black state voltage;
and carrying out gamma regulation on the display device according to the black state voltage and the preceding stage voltage.
2. The gamma debugging method of claim 1,
determining the black state voltage of the display device according to the brightness of the black picture displayed by the display device, comprising:
acquiring a first gray scale voltage corresponding to the display device when the display device displays a black picture;
and when the black picture brightness of the display device under the first gray scale voltage meets the preset brightness, determining the first gray scale voltage as the black state voltage.
3. The gamma debugging method of claim 2, wherein the first gray scale voltage is a threshold voltage corresponding to a black frame displayed by the display device.
4. The gamma debugging method of claim 2, wherein the preset brightness is less than or equal to 0.002 nit.
5. The gamma adjustment method of claim 2, wherein if the black frame of the display device at the first gray scale voltage does not satisfy a predetermined brightness, the first gray scale voltage is modified by a predetermined voltage gradient to obtain a second gray scale voltage;
and determining the second gray scale voltage as the black state voltage until the black picture brightness of the display device meets the preset brightness.
6. The gamma debugging method of claim 5, wherein the preset voltage gradient is 0.1V.
7. The gamma adjustment method of claim 1, wherein the difference between the previous voltage and the black voltage is in the range of 0.2V-0.3V.
8. The gamma debugging method of claim 1, wherein gamma-adjusting the display device according to the black state voltage and the previous stage voltage comprises:
determining the brightness and the gray scale corresponding to the bright-state voltage according to the bright-state voltage corresponding to the display device when the display device displays a white picture, and determining the brightness and the gray scale corresponding to the black-state voltage according to the black-state voltage;
determining target brightness corresponding to the gray scale to be adjusted;
and gamma adjustment is carried out on the display device by taking the preceding-stage voltage, the black-state voltage and the bright-state voltage as reference values so as to achieve the corresponding target brightness.
9. A display driving chip is arranged in a display device, and is characterized by comprising:
the voltage acquisition module is used for determining the black state voltage of the display device according to the brightness of a black picture displayed by the display device;
the voltage calculation module is used for determining a preceding stage voltage corresponding to the black state voltage according to the black state voltage;
and the gamma adjusting module is used for carrying out gamma adjustment on the display device according to the black state voltage and the preceding stage voltage.
10. A display device comprising the display driver chip according to claim 9.
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