CN115938305A - Display driving device, display driving method, and display device - Google Patents
Display driving device, display driving method, and display device Download PDFInfo
- Publication number
- CN115938305A CN115938305A CN202310065964.3A CN202310065964A CN115938305A CN 115938305 A CN115938305 A CN 115938305A CN 202310065964 A CN202310065964 A CN 202310065964A CN 115938305 A CN115938305 A CN 115938305A
- Authority
- CN
- China
- Prior art keywords
- voltage
- gray scale
- reference voltage
- driving power
- gamma
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The embodiment of the invention discloses a display driving device, a display driving method and a display device. The display driving device comprises a reference voltage generation module, a gamma voltage generation module and a gray scale voltage generation module. The reference voltage generating module is used for generating a first reference voltage and a second reference voltage according to a driving power supply voltage accessed by a driving power supply end. The gamma voltage generating module is used for generating a plurality of gamma voltages according to the first reference voltage and the second reference voltage. The gray scale voltage generation module is used for generating gray scale voltages corresponding to a plurality of binding point gray scales, the gray scale voltage corresponding to the lowest binding point gray scale in each binding point gray scale is equal to the driving power supply voltage, and the gray scale voltages corresponding to the rest binding point gray scales except the lowest binding point gray scale are obtained based on each gamma voltage. The technical scheme of the embodiment of the invention is beneficial to reducing the power consumption of the display driving device and improving the precision of the gray scale voltage, so that the display effect is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display driving device, a display driving method and a display device.
Background
With the continuous development of display technology, people have higher and higher performance requirements on display devices. At present, the existing display device has the problems of large power consumption and poor display effect, and user experience is influenced.
Disclosure of Invention
The embodiment of the invention provides a display driving device, a display driving method and a display device, which are used for reducing the power consumption of the display driving device and improving the display effect.
In a first aspect, an embodiment of the present invention provides a display driving apparatus, including:
the reference voltage generating module is connected with a driving power end and used for generating a first reference voltage and a second reference voltage according to a driving power voltage accessed by the driving power end, wherein the driving power voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage;
the gamma voltage generating module is connected with the reference voltage generating module and is used for generating a plurality of gamma voltages according to the first reference voltage and the second reference voltage;
and the gray scale voltage generation module is connected with the driving power end and the gamma voltage generation module and used for generating gray scale voltages corresponding to a plurality of binding gray scales, the gray scale voltage corresponding to the lowest binding gray scale in the binding gray scales is equal to the driving power voltage, and the gray scale voltages corresponding to the binding gray scales except the lowest binding gray scale are obtained based on the gamma voltages.
Optionally, the driving power voltage is a black state voltage corresponding to a black frame displayed by the display device.
Optionally, the reference voltage generating module includes a first reference voltage generating unit and a second reference voltage generating unit;
the first reference voltage generating unit is connected with the driving power supply end and a first reference voltage end and used for generating a first reference voltage according to the driving power supply voltage and a first reference voltage accessed by the first reference voltage end;
the second reference voltage generating unit is connected with the driving power supply end and a second reference voltage end and is used for generating a second reference voltage according to the driving power supply voltage and a second reference voltage accessed by the second reference voltage end;
the driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage.
Optionally, the first reference voltage generating unit includes a first voltage buffer amplifier, and the second reference voltage generating unit includes a second voltage buffer amplifier;
a first input end of the first voltage buffer amplifier is connected with the first reference voltage end, a second input end of the first voltage buffer amplifier is connected with an output end of the first voltage buffer amplifier, a first power end of the first voltage buffer amplifier is connected with the driving power end, a second power end of the first voltage buffer amplifier is grounded, and an output end of the first voltage buffer amplifier provides the first reference voltage;
a first input end of the second voltage buffer amplifier is connected to the second reference voltage end, a second input end of the second voltage buffer amplifier is connected to an output end of the second voltage buffer amplifier, a first power end of the second voltage buffer amplifier is connected to the driving power end, a second power end of the second voltage buffer amplifier is grounded, and an output end of the second voltage buffer amplifier provides the second reference voltage;
the difference between the driving power supply voltage and the first reference voltage is greater than or equal to a preset bias voltage, and the difference between the driving power supply voltage and the second reference voltage is greater than or equal to the preset bias voltage.
Optionally, the reference voltage generating module includes a first reference voltage output terminal and a second reference voltage output terminal, and the gamma voltage generating module includes a voltage dividing circuit including a plurality of voltage dividing resistors and a plurality of gamma voltage output terminals;
each of the voltage dividing resistors is connected in series between the first reference voltage output terminal and the second reference voltage output terminal, the plurality of gamma voltage output terminals are respectively located between the first reference voltage output terminal and the voltage dividing resistors, between the second reference voltage output terminal and the voltage dividing resistors and between the adjacent two voltage dividing resistors, the voltage dividing resistors are used for dividing the voltage between the first reference voltage and the second reference voltage, and the gamma voltage output terminals are used for providing the gamma voltages.
Optionally, the gray scale voltage generation module includes a gating circuit and n gray scale voltage output ends corresponding to the n binding gray scales one to one;
the lowest binding point gray scale corresponds to the 1 st gray scale voltage output end, and the 1 st gray scale voltage output end is connected with the driving power supply end;
the gating circuit is connected with each gamma voltage output end and the 2 nd to the nth gray scale voltage output ends, and is used for controlling the communication between the gray scale voltage output ends and the corresponding gamma voltage output ends so as to provide gray scale voltage for the corresponding gray scale voltage output ends according to the voltage of the gamma voltage output ends.
Optionally, the tie point gray scale includes a first tie point gray scale, the first tie point gray scale is higher than the lowest tie point gray scale, and is lower than except that the lowest tie point gray scale with other than the first tie point gray scale the tie point gray scale, the first tie point gray scale corresponds the gray scale voltage is equal to the first reference voltage.
Optionally, the gray scale voltage corresponding to the highest binding point gray scale in the binding point gray scales is equal to the second reference voltage.
In a second aspect, an embodiment of the present invention provides a display driving method, including:
generating a first reference voltage and a second reference voltage according to a driving power voltage, wherein the driving power voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage;
generating a plurality of gamma voltages according to the first reference voltage and the second reference voltage;
and generating gray scale voltages corresponding to a plurality of binding gray scales, wherein the gray scale voltage corresponding to the lowest binding gray scale in the binding gray scales is equal to the driving power supply voltage, and the gray scale voltages corresponding to the binding gray scales except the lowest binding gray scale are obtained based on the gamma voltages.
In a third aspect, an embodiment of the present invention provides a display device, including the display driving device according to the first aspect, and further including a display panel.
According to the display driving device, the display driving method and the display device provided by the embodiment of the invention, the first reference voltage and the second reference voltage are generated according to the driving power supply voltage, the driving power supply voltage is greater than the first reference voltage, the first reference voltage is greater than the second reference voltage, the gray scale voltage corresponding to the lowest binding point gray scale in each binding point gray scale is set to be equal to the driving power supply voltage, and the gray scale voltages corresponding to the other binding point gray scales except the lowest binding point gray scale are obtained based on each gamma voltage, namely based on the first reference voltage, the second reference voltage and the voltage between the first reference voltage and the second reference voltage, so that the driving power supply voltage can be set to be a lower voltage value, the power consumption of the display driving device is reduced, the cross voltage between the first reference voltage and the second reference voltage is reduced, the precision of each-order gamma voltage is improved, and the display effect is improved. In addition, under the condition that the lowest binding point gray scale is 0 gray scale, the corresponding gray scale voltage is the driving power supply voltage, and the difference value between the driving power supply voltage and the first reference voltage is large, the DBV instruction is adjusted or gamma debugging is carried out to determine the gray scale voltage corresponding to 1 gray scale to 255 gray scale, the gray scale voltage corresponding to the display brightness between 0 gray scale and 1 gray scale cannot be obtained, the problems of uneven display, color cast and the like caused by the fact that the light-emitting device is in a critical conduction state are avoided, and the display effect under the low gray scale is improved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display driving apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another display driving apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display driving apparatus provided in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another display driving apparatus provided in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a gating unit according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another display driving apparatus provided in an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention;
fig. 11 is a flowchart illustrating a display driving method according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background art, the conventional display device has the problems of high power consumption and poor display effect, which affects the user experience. The inventors found that the reasons for the above problems are as follows: the conventional display device includes a display panel and a driving chip, the display panel includes a plurality of sub-pixels, and the sub-pixels may be formed by light Emitting devices, such as organic light-Emitting diodes (OLEDs), and the like, and gray scale voltages corresponding to a plurality of binding point gray scales are obtained by the driving chip according to a driving power voltage, and gray scale voltages corresponding to display gray scales between two adjacent binding point gray scales are obtained by calculating with a difference method according to the gray scale voltages corresponding to the two adjacent binding point gray scales, so as to determine gray scale voltages corresponding to the display gray scales, and the driving chip drives the light Emitting devices to perform light Emitting display according to the gray scale voltages corresponding to the display gray scales. The driving power supply voltage applied by the existing driving chip is large, so that the power consumption of the display device is large, the gray scale voltage obtained by the driving power supply voltage is also large, the difference value between the gray scale voltages corresponding to different binding point gray scales is large, the precision of the gray scale voltage is low, and the display effect is influenced.
In addition, the Display Brightness level of the Display device can be changed by adjusting a Display Brightness Value (DBV) command of the Display device, the DBV command can correspond to the Display Brightness of the maximum gray scale in the Display panel, and after the Display Brightness corresponding to the maximum gray scale in the Display panel is changed, the Display Brightness corresponding to other gray scales is also changed. In the prior art, when a DBV command is adjusted or gamma (gamma) debugging is performed, a gray scale voltage corresponding to display brightness between 0 gray scale and 1 gray scale may be obtained, and due to characteristics of an OLED light emitting device, driving the OLED light emitting device with the gray scale voltage may cause the light emitting device to be in a critical conduction state, thereby causing problems of display unevenness (mura), color cast and the like, and causing poor display effect at low gray scale.
In view of the above problems, embodiments of the present invention provide a display driving apparatus. Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a display driving apparatus according to an embodiment of the present invention. Referring to fig. 1 and 2, the display driving apparatus 100 includes: a reference voltage generating module 10, a gamma voltage generating module 20, and a gray scale voltage generating module 30.
The reference voltage generation module 10 is connected to a driving power supply terminal, the driving power supply terminal is connected to a driving power supply voltage AVDD, the reference voltage generation module 10 is configured to generate a first reference voltage VGMP and a second reference voltage VGSP according to the driving power supply voltage AVDD, the driving power supply voltage AVDD is greater than the first reference voltage VGMP, and the first reference voltage VGMP is greater than the second reference voltage VGSP. The gamma voltage generation module 20 is connected to the reference voltage generation module 10, and the gamma voltage generation module 20 is configured to generate a plurality of gamma voltages according to the first reference voltage VGMP and the second reference voltage VGSP. The gray scale voltage generation module 30 is connected to the driving power supply terminal and the gamma voltage generation module 20, the gray scale voltage generation module 30 is used for generating gray scale voltages corresponding to a plurality of binding point gray scales, the gray scale voltage corresponding to the lowest binding point gray scale in each binding point gray scale is equal to the driving power supply voltage AVDD, and the gray scale voltages corresponding to the remaining binding point gray scales except the lowest binding point gray scale are obtained based on each gamma voltage.
Specifically, the display device includes a display driving device 100, a display panel 200, and a gate driving module 300. The Display driving apparatus 100 may be a Display Driver Integrated Circuit (DDIC) chip, a Touch and Display Driver Integration (TDDI) chip, or the like. The display panel 200 may include a plurality of scan lines GL extending in a row direction and a plurality of data lines DL extending in a column direction and crossing the scan lines GL, the crossing of the scan lines GL and the data lines DL may define a plurality of pixel regions on the display panel 200, each of the pixel regions may have a pixel circuit PX disposed therein, and the plurality of pixel circuits PX may be arrayed in the display panel 200.
Each pixel circuit PX may include a thin film transistor, a storage capacitor, and a light emitting device, which may be an organic light emitting diode OLED or a Micro-sized light emitting diode (Micro-LED), etc., the thin film transistor including a switching transistor and a driving transistor. When a scan signal in the form of a pulse signal is input to the scan line GL, the switching transistor in the pixel circuit PX connected to the scan line GL is turned on, and the pixel circuit PX may receive the data voltage transmitted from the data line DL at this time to drive the light emitting device to emit light at a corresponding luminance according to the data voltage through the driving transistor in the pixel circuit PX.
The display driving apparatus 100 may control the gate driving module 300 according to the received image signal, so that the gate driving module 300 transmits a scanning signal to each row of pixel circuits PX, and transmits a data voltage to each column of pixel circuits PX through the display driving apparatus 100, so that each pixel circuit PX in the display panel 200 drives the light emitting device to emit light row by row, so that the display panel 200 realizes a display function.
It should be noted that fig. 1 only shows that the display driving device 100 and the gate driving module 300 are both disposed outside the display panel 200, in other embodiments, the display driving device 100 and the gate driving module 300 may also be disposed in a non-display area of the display panel 200, and the gate driving module 300 may also be integrated in the display driving device 100.
The gamma voltage generation module 20 may generate gamma voltages according to the first reference voltage VGMP and the second reference voltage VGSP, and divide a voltage between the first reference voltage VGMP and the second reference voltage VGSP to obtain the gamma voltages. Illustratively, the gamma voltage generation module 20 may generate m gamma voltages including gamma voltages VR1, VR2, VR3, \8230; \8230, VRm-1, VRm. The gamma voltages VR1 may be equal to the first reference voltage VGMP, the gamma voltages VRm may be equal to the second reference voltage VGSP, and the gamma voltages VR2 to VRm-1 may be voltages divided between the first reference voltage VGMP and the second reference voltage VGSP.
The gray scale voltage output end corresponding to the lowest binding point gray scale in each binding point gray scale is connected to the driving power supply end, so that the gray scale voltage corresponding to the lowest binding point gray scale is equal to the driving power supply voltage AVDD connected to the driving power supply end. The plurality of binding gray levels may be a set of preset display gray levels, for example, at least a portion of the plurality of binding gray levels is 0 gray level to 255 gray levels. The gray scale voltage may be a voltage for driving the light emitting device to emit light, for example, the gray scale voltage may be a data voltage for driving the light emitting device to emit light, or the data voltage may be obtained by processing the gray scale voltage. The gray scale voltage generation module 30 can generate the gray scale voltages corresponding to n binding gray scales, and the ith binding gray scale corresponds to the gray scale voltage Vi, i is more than or equal to 1 and less than or equal to n, i.e. the gray scale voltage generation module 30 can generate the gray scale voltages V1, V2, V3, \ 8230 \ 8230;, vn-1 and Vn. The lowest binding point gray scale is the lowest display gray scale in each binding point gray scale, and the gray scale voltage corresponding to the lowest binding point gray scale is greater than the gray scale voltages corresponding to the other binding point gray scales, for example, the lowest binding point gray scale may be the 1 st binding point gray scale and is 0 gray scale, and then the gray scale voltage V1 corresponding to the lowest binding point gray scale is equal to the driving power supply voltage AVDD. The remaining tie point gray levels except for the lowest tie point gray level are the 2 nd to nth tie point gray levels, and any one of the gray level voltages V2 to Vn corresponding to the 2 nd to nth tie point gray levels may be obtained based on the gamma voltages VR1 to VRm, that is, any one of the gray level voltages V2 to Vn may be obtained based on the first reference voltage VGMP, the second reference voltage VGSP, and a voltage therebetween.
Since the first reference voltage VGMP and the second reference voltage VGSP are generated according to the driving power voltage AVDD, the gamma voltages VR1 to VRm are generated according to the first reference voltage VGMP, the second reference voltage VGSP, and the voltage therebetween, the driving power voltage AVDD is greater than the first reference voltage VGMP, the first reference voltage VGMP is greater than the second reference voltage VGSP, and the driving power voltage AVDD is greater than each gamma voltage, in this embodiment, the gray scale voltage corresponding to the lowest binding point gray scale is set as the driving power voltage AVDD, the gray scale voltages corresponding to the remaining binding point gray scales are obtained based on the gamma voltages VR1 to VRm, and the gray scale voltage corresponding to the lowest binding point gray scale is greater than the gray scale voltages corresponding to the remaining binding point gray scales, and compared with a scheme in which the gray scale voltages corresponding to each binding point gray scale are obtained based on the gamma voltages VR1 to VRm, the driving power voltage AVDD can be set lower under the condition that the gray scale voltages corresponding to the lowest binding point gray scale are the same. For example, when the gray scale voltage corresponding to the lowest binding point gray scale is 6.7V, the driving power voltage AVDD in this embodiment may be directly set to 6.7V; if the gray scale voltage corresponding to the lowest binding point gray scale needs to be obtained according to the gamma voltages VR1 to VRm, that is, the first reference voltage VGMP, the second reference voltage VGSP, and the voltage therebetween, it is necessary to ensure that the first reference voltage VGMP is at least 6.7V, and the corresponding driving power voltage AVDD should be a voltage greater than 6.7V. That is to say, the technical solution of this embodiment enables the driving power voltage AVDD to be set to a lower voltage value, which is beneficial to reducing the power consumption of the display driving apparatus. When the driving power supply voltage AVDD is low, the first reference voltage VGMP and the second reference voltage VGSP obtained based on the driving power supply voltage AVDD are also lower, which is helpful for reducing the voltage across the first reference voltage VGMP and the second reference voltage VGSP, thereby improving the precision of each gamma voltage, further improving the precision of the gray scale voltage, and improving the display effect.
When the plurality of binding point gray scales include the gray scales from 0 to 255, the gray scale voltage corresponding to the gray scales from 0 to 255 may be directly generated by the gray scale voltage generation module 30, so as to drive the display device to display each gray scale based on the generated gray scale voltage. Under the condition that the plurality of binding point gray scales comprise partial gray scales from 0 gray scale to 255 gray scale, calculation can be carried out according to gray scale voltages corresponding to the binding point gray scales to obtain gray scale voltages corresponding to other display gray scales except the binding point gray scale from the 0 gray scale to the 255 gray scale. For example, according to gray scale voltages corresponding to the jth binding gray scale and the (j + 1) th binding gray scale, an interpolation method is adopted to calculate gray scale voltages corresponding to display gray scales between the jth binding gray scale and the (j + 1) th binding gray scale, so that gray scale voltages corresponding to the display gray scales are obtained.
The lower the display gray scale, the higher the corresponding gray scale voltage. When the lowest binding point gray scale is the 0 gray scale, the driving power voltage AVDD may be set to the gray scale voltage corresponding to the 0 gray scale, and the gray scale voltages corresponding to the remaining binding point gray scales except the 0 gray scale are obtained according to the gamma voltages VR1 to VRm, and the gray scale voltages corresponding to the display gray scales except the binding point gray scale among the 0 gray scale to 255 gray scale are obtained by calculating (for example, by using an interpolation method) according to the gray scale voltages corresponding to the binding point gray scales. That is, the gray voltages corresponding to the 1 gray scale to the 255 gray scale are all between the gamma voltages VR1 to VRm, that is, between the first reference voltage VGMP and the second reference voltage VGSP, and the maximum selectable voltage value of the gray voltages corresponding to the gray scales of the 1 gray scale to the 255 gray scale is the first reference voltage VGMP. In this embodiment, since the driving power voltage AVDD is a gray scale voltage corresponding to the 0 gray scale, and the driving power voltage AVDD is greater than the first reference voltage VGMP, when the difference between the driving power voltage AVDD and the first reference voltage VGMP is large, and the first reference voltage VGMP is greater than the gray scale voltage corresponding to the display brightness between the 0 gray scale and the 1 gray scale, the DBV instruction is adjusted or gamma debugging is performed to determine the gray scale voltage corresponding to the 1 gray scale to 255 gray scale, so that the gray scale voltage corresponding to the display brightness between the 0 gray scale and the 1 gray scale is not obtained, which is helpful for avoiding the problems of uneven display and color cast caused by the light emitting device being in a critical conduction state, thereby improving the display effect under a low gray scale.
In summary, according to the technical solution of the embodiments of the present invention, a first reference voltage and a second reference voltage are generated according to a driving power voltage, the driving power voltage is greater than the first reference voltage, the first reference voltage is greater than the second reference voltage, by setting a gray scale voltage corresponding to a lowest binding point gray scale in each binding point gray scale to be equal to the driving power voltage, and gray scale voltages corresponding to other binding point gray scales except the lowest binding point gray scale are obtained based on each gamma voltage, that is, based on the first reference voltage, the second reference voltage and a voltage therebetween, the driving power voltage can be set to a lower voltage value, so as to reduce power consumption of the display driving apparatus, and reduce a voltage across between the first reference voltage and the second reference voltage, thereby improving a precision of each level of the gamma voltages, so as to improve a precision of the gray scale voltages, and improve a display effect. In addition, under the condition that the lowest binding point gray scale is 0 gray scale, the corresponding gray scale voltage is the driving power supply voltage, and the difference value between the driving power supply voltage and the first reference voltage is large, the DBV instruction is adjusted or gamma debugging is carried out to determine the gray scale voltage corresponding to 1 gray scale to 255 gray scale, the gray scale voltage corresponding to the display brightness between 0 gray scale and 1 gray scale cannot be obtained, the problems of uneven display, color cast and the like caused by the fact that the light-emitting device is in a critical conduction state are avoided, and the display effect under the low gray scale is improved.
On the basis of the foregoing embodiment, optionally, the driving power voltage AVDD is a black state voltage corresponding to a black frame displayed by the display device. For example, the lowest binding point gray scale is a 0 gray scale, the gray scale voltage corresponding to the 0 gray scale is the driving power voltage AVDD, and the driving power voltage AVDD is set to be a black state voltage, and the black state voltage is used to drive the display device to display, so that the display device can display a black picture at the 0 gray scale on one hand, and the driving power voltage AVDD can be set to be a lower voltage value on the other hand. In the prior art, the driving power voltage AVDD is generally greater than the black state voltage, and the voltage value is about 7V, so that the power consumption of the display driving device is high, and accordingly, the obtained gray scale voltage is also high, and the precision of the gray scale voltage is low. In this embodiment, the driving power voltage AVDD may be set to a black state voltage of about 6.7V to reduce power consumption of the display driving apparatus, and voltage values of the first reference voltage VGMP and the second reference voltage VGSP obtained based on the driving power voltage AVDD are reduced, which is helpful for reducing a voltage across the first reference voltage VGMP and the second reference voltage VGSP, thereby improving accuracy of the gamma voltage of each step, and further improving accuracy of the grayscale voltage, so that a display effect can be improved.
Fig. 3 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention. Referring to fig. 3, the reference voltage generating module 10 optionally includes a first reference voltage generating unit 110 and a second reference voltage generating unit 120. The first reference voltage generating unit 110 is connected to the driving power terminal and the first reference voltage terminal, the first reference voltage terminal is connected to the first reference voltage VGMP ', and the first reference voltage generating unit 110 is configured to generate the first reference voltage VGMP according to the driving power voltage AVDD and the first reference voltage VGMP'. The second reference voltage generating unit 120 is connected to the driving power terminal and the second reference voltage terminal, the second reference voltage terminal is connected to the second reference voltage VGSP ', and the second reference voltage generating unit 120 is configured to generate the second reference voltage VGSP according to the driving power voltage AVDD and the second reference voltage VGSP'. The driving power voltage AVDD is greater than the first reference voltage VGMP ', and the first reference voltage VGMP ' is greater than the second reference voltage VGSP '.
In one embodiment, the first reference voltage generating unit 110 may be configured to amplify the driving capability of the first reference voltage signal (the first reference voltage signal represents a voltage signal corresponding to the first reference voltage VGMP ', the same applies hereinafter) under the driving of the driving power voltage AVDD to obtain a first reference voltage signal, and the first reference voltage VGMP' and the first reference voltage VGMP have the same magnitude, and the second reference voltage generating unit 120 may be configured to amplify the driving capability of the second reference voltage signal (the second reference voltage signal represents a voltage signal corresponding to the second reference voltage VGSP ', the same applies hereinafter) under the driving of the driving power voltage AVDD to obtain a second reference voltage signal, and the second reference voltage VGSP' and the second reference voltage VGSP have the same magnitude, such that the driving power voltage AVDD is greater than the first reference voltage VGMP, and the first reference voltage VGMP 'is greater than the second reference voltage VGSP'. In this way, the first reference voltage VGMP can be generated by the first reference voltage generating unit 110, and the second reference voltage VGSP can be generated by the second reference voltage generating unit 120, so as to control the magnitudes of the first reference voltage VGMP and the second reference voltage VGSP, respectively, and improve the driving capability of the first reference voltage signal and the second reference voltage signal.
Fig. 4 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention. Referring to fig. 4, on the basis of the above embodiment, optionally, the first reference voltage generating unit 110 includes a first voltage buffer amplifier OP1, and the second reference voltage generating unit 120 includes a second voltage buffer amplifier OP2. The first input end of the first voltage buffer amplifier OP1 is connected with a first reference voltage end, the second input end of the first voltage buffer amplifier OP1 is connected with the output end of the first voltage buffer amplifier OP1, the first power end of the first voltage buffer amplifier OP1 is connected with a driving power end, the second power end of the first voltage buffer amplifier OP1 is grounded, and the output end of the first voltage buffer amplifier OP1 provides a first reference voltage VGMP. The first input end of the second voltage buffer amplifier OP2 is connected to the second reference voltage end, the second input end of the second voltage buffer amplifier OP2 is connected to the output end of the second voltage buffer amplifier OP2, the first power end of the second voltage buffer amplifier OP2 is connected to the driving power end, the second power end of the second voltage buffer amplifier OP2 is grounded, and the output end of the second voltage buffer amplifier OP2 provides the second reference voltage VGSP. The difference between the driving power voltage AVDD and the first reference voltage VGMP is greater than or equal to the preset bias voltage, and the difference between the driving power voltage AVDD and the second reference voltage VGSP is greater than or equal to the preset bias voltage.
Specifically, the voltage buffer amplifier is also called as a driving capability amplifier or a voltage follower, the voltage gain of the voltage buffer amplifier is 1, the function of a unity gain buffer is realized, the output voltage of the voltage buffer amplifier can follow or track the input voltage, but a larger current gain can be provided, so that a power gain is provided, and the driving capability of the output signal is improved while the voltage value of the input signal is kept unchanged for output. The first voltage buffer amplifier OP1 may amplify the driving capability of the first reference voltage signal under the driving of the driving power voltage AVDD to obtain a first reference voltage signal, and the first reference voltage VGMP' and the first reference voltage VGMP have the same magnitude. The second voltage buffer amplifier OP2 may amplify the driving capability of the second reference voltage signal under the driving of the driving power voltage AVDD to obtain a second reference voltage signal, and the second reference voltage VGSP' and the second reference voltage VGSP have the same magnitude. According to the operating principle of the voltage buffer amplifier, in order to drive the first voltage buffer amplifier OP1 and the second voltage buffer amplifier OP2 to operate, the difference between the voltage value of the first power terminal of the first voltage buffer amplifier OP1 and the voltage value of the first input terminal (or the voltage value of the output terminal) of the second voltage buffer amplifier OP2 needs to be set to be greater than or equal to the preset bias voltage, and the specific value of the preset bias voltage can be determined according to the structures of the first voltage buffer amplifier OP1 and the second voltage buffer amplifier OP2.
Illustratively, when the preset bias voltage is 0.3V, AVDD-VGMP ≧ 0.3V and AVDD-VGSP ≧ 0.3V should be satisfied. Accordingly, the lowest binding point gray scale can be set to be 0 gray scale, the gray scale voltage corresponding to 0 gray scale is equal to the driving power voltage AVDD, the driving power voltage AVDD is 6.7V of black state voltage, the first reference voltage VGMP is 6.4V, the second reference voltage VGSP is 2V, and VGMP-VGSP =4.4V. In the prior art, a driving power supply voltage is generally set to be 7V, a high voltage of a reference voltage obtained from the driving power supply voltage is 6.7V, and a low voltage of the reference voltage is 2V, so that a voltage across the reference voltage is 4.7V. Therefore, compared with the prior art, according to the technical scheme of the embodiment of the invention, the gray scale voltage corresponding to the lowest binding point gray scale is set to be equal to the driving power supply voltage AVDD, so that the voltage value of the driving power supply voltage AVDD can be reduced by 0.3V, the voltage across the first reference voltage VGMP and the second reference voltage VGSP can be reduced by 0.3V, and the precision of each step of gamma voltage is improved. In addition, since the driving power voltage AVDD is a black state voltage of 0 gray scale, and the difference between the driving power voltage AVDD and the first reference voltage VGMP is at least 0.3V, the gray scale voltage obtained according to the first reference voltage VGMP, the second reference voltage VGSP, and the voltage between the first reference voltage VGMP and the second reference voltage VGSP does not cause the light emitting device to display luminance between 0 gray scale and 1 gray scale, which is helpful for avoiding the problems of display unevenness and color cast caused by the light emitting device being in a critical on state, thereby improving the display effect under low gray scale.
With reference to fig. 4, further, the first reference voltage generating unit 110 further includes a first digital-to-analog converting unit 111, an output end of the first digital-to-analog converting unit 111 is used as a first reference voltage end, and the first digital-to-analog converting unit 111 is configured to perform digital-to-analog conversion on a signal input by its input end and output the signal. The second reference voltage generating unit 120 further includes a second digital-to-analog converting unit 112, an output end of the second digital-to-analog converting unit 112 is used as a second reference voltage end, and the second digital-to-analog converting unit 112 is configured to perform digital-to-analog conversion on a signal input by its input end and output the signal.
In one embodiment, the first digital-to-analog conversion unit 111 and the second reference voltage generation unit 120 may each be a digital-to-analog converter (DAC). The input end of the first digital-to-analog conversion unit 111 is connected to a first reference voltage signal in the form of a digital signal, and the first digital-to-analog conversion unit 111 can convert the first reference voltage signal into an analog signal and output the analog signal. The input end of the second digital-to-analog converting unit 112 is connected to the second reference voltage signal in the form of a digital signal, and the second digital-to-analog converting unit 112 can convert the second reference voltage signal into an analog signal and output the analog signal.
Fig. 5 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention. Referring to fig. 5, optionally, the reference voltage generating module 10 includes a first reference voltage output terminal for outputting the first reference voltage VGMP, and a second reference voltage output terminal for outputting the second reference voltage VGSP. The gamma voltage generating module 20 includes a voltage dividing circuit including a plurality of voltage dividing resistors R and a plurality of gamma voltage output terminals. Each divider resistor R is connected in series between a first reference voltage output end and a second reference voltage output end, a plurality of gamma voltage output ends are respectively positioned between the first reference voltage output end and the divider resistor R, between the second reference voltage output end and the divider resistor R and between two adjacent divider resistors R, the divider resistor R is used for dividing the voltage between the first reference voltage VGMP and the second reference voltage VGSP, and the gamma voltage output ends are used for providing gamma voltages.
Illustratively, the number of the voltage dividing resistors R is m-1, the number of the gamma voltage output terminals is m, the gamma voltage output terminal between the first reference voltage output terminal and the 1 st voltage dividing resistor R provides the gamma voltage VR1, and VR1= VGMP, the gamma voltage output terminal between the kth and the k +1 th voltage dividing resistor R provides the gamma voltage VRk, k is greater than or equal to 2 and less than or equal to m-2, the gamma voltage output terminal between the second reference voltage output terminal and the m-1 th voltage dividing resistor R provides the gamma voltage VRm, and VRm = VGSP.
Fig. 6 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention. Referring to fig. 6, the gray scale voltage generating module 30 may optionally include a gate circuit 310 and n gray scale voltage output terminals corresponding to the n binding gray scales one to one. The lowest binding point gray scale corresponds to the 1 st gray scale voltage output end, and the 1 st gray scale voltage output end is connected with a driving power supply end. The gating circuit 310 is connected to each gamma voltage output terminal and the 2 nd to nth gray scale voltage output terminals, and the gating circuit 310 is configured to control the communication between the gray scale voltage output terminals and the corresponding gamma voltage output terminals, so as to provide gray scale voltages to the corresponding gray scale voltage output terminals according to the voltages of the gamma voltage output terminals.
For example, the gating circuit 310 may control connection or disconnection between the a-th gamma voltage output terminal of the gamma voltage generation module 20 and the b-th gray scale voltage output terminal of the gray scale voltage generation module 30, where a is greater than or equal to 1 and less than or equal to m, and b is greater than or equal to 2 and less than or equal to n, so as to provide the gamma voltage output by the a-th gamma voltage output terminal to the b-th gray scale voltage output terminal as the gray scale voltage corresponding to the b-th binding point gray scale. The gating circuit 310 controls each gray scale voltage output end to be communicated with the corresponding gamma voltage output end, so that the n gray scale voltage output ends and the n gamma voltage output ends can be communicated in a one-to-one correspondence manner, and the n gamma voltages are selected from the gamma voltages output by the m gamma voltage output ends to serve as the gray scale voltages of the n gray scale voltage output ends.
Fig. 7 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention. Referring to fig. 7, in an embodiment, the gating circuit 310 may include n-1 gating units 311 disposed in one-to-one correspondence with the 2 nd to nth gray scale voltage output terminals, each gating unit 311 is connected to each gamma voltage output terminal and a corresponding gray scale voltage output terminal (fig. 7 does not specifically show the connection of each gating unit 311 to each gamma voltage output terminal), and the gating unit 311 is configured to control the corresponding gray scale voltage output terminal to communicate with any one of the gamma voltage output terminals so as to provide a gray scale voltage to the corresponding gray scale voltage output terminal according to the voltage of each gamma voltage output terminal. Each of the gating units 311 may include a plurality of switches connected to a conduction path between each of the gamma voltage output terminals and the corresponding gray scale voltage output terminal, so as to control connection or disconnection between each of the gamma voltage output terminals and the corresponding gray scale voltage output terminal, thereby providing the gamma voltage output from any one of the gamma voltage output terminals to the corresponding gray scale voltage output terminal.
Fig. 8 is a schematic structural diagram of a gating unit according to an embodiment of the present invention. Fig. 8 schematically shows a specific structure of the gating unit 311 corresponding to the b-th gray scale voltage output terminal, taking the example that the gamma voltage generating module 20 includes 7 voltage dividing resistors R. In conjunction with fig. 7 and 8, for example, when the gamma voltage generating module 20 includes 7 voltage dividing resistors R, the number of gamma voltage output terminals is 8, and the gating unit 311 may be configured to include a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, and a sixth switch K6. By providing the first control signal d1 to the control terminal of the first switch K1, providing the first control signal d2 to the control terminal of the second switch K2, providing the first control signal d3 to the control terminal of the third switch K3, providing the first control signal d4 to the control terminal of the fourth switch K4, providing the first control signal d5 to the control terminal of the fifth switch K5, and providing the first control signal d6 to the control terminal of the sixth switch K6, on and off of each switch can be controlled, thereby realizing that any one of the gamma voltages VR1 to VR8 is provided to the b-th gray scale voltage output terminal corresponding to the gating unit 311 as a gray scale voltage corresponding to the b-th binding point gray scale, and b is greater than or equal to 2 and less than or equal to n.
With reference to fig. 7 and 8, the gray scale voltage generating module 30 further includes n-1 third voltage buffer amplifiers OP3 corresponding to the 2 nd to nth gray scale voltage output ends one by one, the b-th third voltage buffer amplifier OP3 is connected between the b-th gray scale voltage output end and the b-th gating unit 311, b is greater than or equal to 2 and less than or equal to n, and the third voltage buffer amplifier OP3 is configured to amplify the driving capability of the output signal of the gating unit 311 and provide the amplified signal to the corresponding gray scale voltage output end. The specific structure of the third voltage buffer amplifier OP3 may be the same as the structures of the first voltage buffer amplifier OP1 and the second voltage buffer amplifier OP2, the third voltage buffer amplifier OP3 also includes a first input terminal, a second input terminal, a first power terminal, a second power terminal, and an output terminal, the first input terminal of the third voltage buffer amplifier OP3 is connected to the corresponding gating unit 311, the output terminal of the third voltage buffer amplifier OP3 is connected to the corresponding grayscale voltage output terminal, the first power terminal of the third voltage buffer amplifier OP3 is connected to the power voltage, and the second input terminal of the third voltage buffer amplifier OP3 is connected to the output terminal, and the specific structure can be understood with reference to fig. 7.
Fig. 9 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention. Referring to fig. 9, based on the above embodiments, optionally, the binding gray scales include a first binding gray scale, where the first binding gray scale is higher than the lowest binding gray scale and lower than the other binding gray scales except the lowest binding gray scale and the first binding gray scale, and a gray scale voltage corresponding to the first binding gray scale is equal to the first reference voltage VGMP.
Illustratively, the number of the binding gray scales is n, and the gray scale voltage generation module 30 includes n gray scale voltage output terminals corresponding to the n binding gray scales one to one. The 1 st to nth binding gray scales are sequentially changed from a low gray scale to a high gray scale, the 1 st binding gray scale is the lowest binding gray scale, the 2 nd binding gray scale is the first binding gray scale, and a gray scale voltage output end corresponding to the 2 nd binding gray scale in the gray scale voltage generation module 30 can be set to be connected with a first reference voltage output end of the reference voltage generation module 10, so that the first reference voltage VGMP is directly provided to a gray scale voltage output end corresponding to the 2 nd binding gray scale to serve as a gray scale voltage V2 corresponding to the first binding gray scale.
In one embodiment, the 1 st binding gray scale may be a 0 gray scale, the 2 nd binding gray scale may be a 1 gray scale, and the 2 nd binding gray scale, that is, the gray scale voltage corresponding to the 1 gray scale is set to be equal to the first reference voltage VGMP, which helps to reduce the first reference voltage VGMP, thereby reducing the voltage across the first reference voltage VGMP and the second reference voltage VGSP. Specifically, when the display device is subjected to gamma debugging, the display device can be driven to display through a first preset gray scale voltage, the first preset gray scale voltage is adjusted according to whether the actual brightness of the display device can reach the target brightness corresponding to the 1 gray scale, the first preset gray scale voltage corresponding to the fact that the actual brightness of the display device can reach the target brightness is set as a first reference voltage VGMP, and the gray scale voltage corresponding to the first tie point gray scale (namely the 1 gray scale) is set to be equal to the first reference voltage VGMP. The conventional display device generally generates a gray scale voltage based on a high voltage and a low voltage in a reference voltage, and the high voltage in the reference voltage is usually greater than the gray scale voltage corresponding to a gray scale of 1, and even greater than the gray scale voltage corresponding to a gray scale of 0, so that the value of the high voltage in the reference voltage is larger, a voltage across between the high voltage and the low voltage in the reference voltage is larger, and the precision of the gray scale voltage is affected. Compared with the prior art, the first reference voltage VGMP is adjusted according to the display brightness corresponding to the 1 gray scale in the embodiment, and the gray scale voltage corresponding to the 1 gray scale is set to be equal to the first reference voltage VGMP, so that the voltage value of the first reference voltage VGMP can be reduced, which is helpful for reducing the voltage across the first reference voltage VGMP and the second reference voltage VGSP, thereby improving the precision of the gamma voltage of each step, further improving the precision of the gray scale voltage, and improving the display effect.
Fig. 10 is a schematic structural diagram of another display driving apparatus according to an embodiment of the present invention. Referring to fig. 10, on the basis of the above embodiments, optionally, the gray scale voltage corresponding to the highest one of the respective tie point grays is equal to the second reference voltage VGSP.
For example, the nth binding gray scale is the highest binding gray scale, and the gray scale voltage output terminal corresponding to the nth binding gray scale in the gray scale voltage generation module 30 may be connected to the second reference voltage output terminal of the reference voltage generation module 10, so as to directly provide the second reference voltage VGSP to the gray scale voltage output terminal corresponding to the nth binding gray scale as the gray scale voltage Vn corresponding to the highest binding gray scale.
In one embodiment, the nth binding gray scale may be 255 gray scales, and the setting of the nth binding gray scale, that is, the gray scale voltage corresponding to the 255 gray scale is equal to the second reference voltage VGSP, helps to increase the second reference voltage VGSP, thereby reducing the voltage across the first reference voltage VGMP and the second reference voltage VGSP. Specifically, when the display device is gamma-debugged, the display device may be driven to display through a second preset gray scale voltage, the second preset gray scale voltage is adjusted according to whether the actual brightness of the display device can reach the target brightness corresponding to the 255 gray scale, the second preset gray scale voltage corresponding to the actual brightness of the display device that can reach the target brightness is set as a second reference voltage VGSP, and the gray scale voltage corresponding to the highest tie point gray scale (i.e., the 255 gray scale) is set to be equal to the second reference voltage VGSP. The low voltage in the reference voltage applied by the conventional display device is usually smaller than the gray scale voltage corresponding to the 255 gray scales, so that the value of the low voltage in the reference voltage is smaller, the voltage across the high voltage and the low voltage in the reference voltage is larger, and the precision of the gray scale voltage is influenced. Compared with the prior art, the second reference voltage VGSP is adjusted according to the display brightness corresponding to the 255 gray scale, and the gray scale voltage corresponding to the highest tie point gray scale is set to be equal to the second reference voltage VGSP, so that the voltage value of the second reference voltage VGSP can be increased, which is helpful for reducing the voltage across the first reference voltage VGMP and the second reference voltage VGSP, thereby improving the precision of each level of gamma voltage, further improving the precision of the gray scale voltage, and improving the display effect.
Embodiments of the present invention further provide a display device, which includes a display panel and the display driving device in any of the above embodiments, and therefore, the display device has a corresponding functional structure and beneficial effects in the display driving device, and details are not repeated here. The display panel may be specifically an OLED display panel or a Micro-LED display panel. The display device may be a mobile phone, or any electronic product with a display function, including but not limited to the following categories: the touch screen display device comprises a television, a notebook computer, a desktop display, a tablet computer, a digital camera, an intelligent bracelet, intelligent glasses, a vehicle-mounted display, medical equipment, industrial control equipment, a touch interaction terminal and the like, and the embodiment of the invention is not particularly limited to this.
Embodiments of the present invention further provide a display driving method, which may be executed by the display driving apparatus in any of the above embodiments. Fig. 11 is a flowchart illustrating a display driving method according to an embodiment of the present invention. Referring to fig. 11, the method specifically includes the following steps:
and S110, generating a first reference voltage and a second reference voltage according to the driving power voltage, wherein the driving power voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage.
And S120, generating a plurality of gamma voltages according to the first reference voltage and the second reference voltage.
S130, gray scale voltages corresponding to a plurality of binding gray scales are generated, the gray scale voltage corresponding to the lowest binding gray scale in each binding gray scale is equal to the driving power supply voltage, and the gray scale voltages corresponding to the other binding gray scales except the lowest binding gray scale are obtained based on each gamma voltage.
According to the technical scheme of the embodiment of the invention, the first reference voltage and the second reference voltage are generated according to the driving power supply voltage, the driving power supply voltage is greater than the first reference voltage, the first reference voltage is greater than the second reference voltage, the gray scale voltage corresponding to the lowest binding point gray scale in each binding point gray scale is set to be equal to the driving power supply voltage, and the gray scale voltages corresponding to the other binding point gray scales except the lowest binding point gray scale are obtained based on each gamma voltage, namely based on the first reference voltage, the second reference voltage and the voltage between the first reference voltage and the second reference voltage, so that the driving power supply voltage can be set to be a lower voltage value, the power consumption of the display driving device is reduced, the voltage across between the first reference voltage and the second reference voltage is reduced, the precision of the gamma voltage of each stage is improved, the precision of the gray scale voltage is improved, and the display effect is improved. In addition, under the condition that the lowest binding point gray scale is 0 gray scale, the corresponding gray scale voltage is the driving power supply voltage, and the difference value between the driving power supply voltage and the first reference voltage is large, the DBV instruction is adjusted or gamma debugging is carried out to determine the gray scale voltage corresponding to 1 gray scale to 255 gray scale, the gray scale voltage corresponding to the display brightness between 0 gray scale and 1 gray scale cannot be obtained, the problems of uneven display, color cast and the like caused by the fact that the light-emitting device is in a critical conduction state are avoided, and the display effect under the low gray scale is improved.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A display drive apparatus, comprising:
the reference voltage generating module is connected with a driving power end and used for generating a first reference voltage and a second reference voltage according to a driving power voltage accessed by the driving power end, wherein the driving power voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage;
the gamma voltage generating module is connected with the reference voltage generating module and is used for generating a plurality of gamma voltages according to the first reference voltage and the second reference voltage;
and the gray scale voltage generation module is connected with the driving power end and the gamma voltage generation module and used for generating gray scale voltages corresponding to a plurality of binding point gray scales, each gray scale voltage corresponding to the lowest binding point gray scale in the binding point gray scales is equal to the driving power voltage, and the gray scale voltages except the lowest binding point gray scale and corresponding to the binding point gray scales are obtained based on the gamma voltages.
2. The display driving device according to claim 1, wherein the driving power supply voltage is a black state voltage corresponding to a black frame displayed by the display device.
3. The display driving device according to claim 1, wherein the reference voltage generating module includes a first reference voltage generating unit and a second reference voltage generating unit;
the first reference voltage generating unit is connected with the driving power supply end and a first reference voltage end and used for generating a first reference voltage according to the driving power supply voltage and a first reference voltage accessed by the first reference voltage end;
the second reference voltage generating unit is connected with the driving power supply end and a second reference voltage end and is used for generating a second reference voltage according to the driving power supply voltage and a second reference voltage accessed by the second reference voltage end;
the driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage.
4. The display driving device according to claim 3, wherein the first reference voltage generating unit includes a first voltage buffer amplifier, and the second reference voltage generating unit includes a second voltage buffer amplifier;
a first input end of the first voltage buffer amplifier is connected to the first reference voltage end, a second input end of the first voltage buffer amplifier is connected to an output end of the first voltage buffer amplifier, a first power end of the first voltage buffer amplifier is connected to the driving power end, a second power end of the first voltage buffer amplifier is grounded, and an output end of the first voltage buffer amplifier provides the first reference voltage;
a first input end of the second voltage buffer amplifier is connected with the second reference voltage end, a second input end of the second voltage buffer amplifier is connected with an output end of the second voltage buffer amplifier, a first power end of the second voltage buffer amplifier is connected with the driving power end, a second power end of the second voltage buffer amplifier is grounded, and an output end of the second voltage buffer amplifier provides the second reference voltage;
the difference between the driving power supply voltage and the first reference voltage is greater than or equal to a preset bias voltage, and the difference between the driving power supply voltage and the second reference voltage is greater than or equal to the preset bias voltage.
5. The display driving device according to claim 1, wherein the reference voltage generating module includes a first reference voltage output terminal and a second reference voltage output terminal, and the gamma voltage generating module includes a voltage dividing circuit including a plurality of voltage dividing resistors and a plurality of gamma voltage output terminals;
each of the voltage dividing resistors is connected in series between the first reference voltage output terminal and the second reference voltage output terminal, the plurality of gamma voltage output terminals are respectively located between the first reference voltage output terminal and the voltage dividing resistors, between the second reference voltage output terminal and the voltage dividing resistors and between two adjacent voltage dividing resistors, the voltage dividing resistors are configured to divide a voltage between the first reference voltage and the second reference voltage, and the gamma voltage output terminals are configured to provide the gamma voltages.
6. The display driving device according to claim 1, wherein the grayscale voltage generating module includes a gate circuit and n grayscale voltage output terminals in one-to-one correspondence with the n binding grays;
the lowest binding point gray scale corresponds to the 1 st gray scale voltage output end, and the 1 st gray scale voltage output end is connected with the driving power supply end;
the gating circuit is connected with each gamma voltage output end and the 2 nd to the nth gray scale voltage output ends, and is used for controlling the communication between the gray scale voltage output ends and the corresponding gamma voltage output ends so as to provide gray scale voltage for the corresponding gray scale voltage output ends according to the voltage of the gamma voltage output ends.
7. The display driving device according to claim 1, wherein the binding gray scale includes a first binding gray scale which is higher than the lowest binding gray scale and lower than the remaining binding gray scales except the lowest binding gray scale and the first binding gray scale, and wherein the gray scale voltage corresponding to the first binding gray scale is equal to the first reference voltage.
8. The display driving device according to any one of claims 1 to 7, wherein the gray scale voltage corresponding to a highest one of the respective binding gray scales is equal to the second reference voltage.
9. A display driving method, comprising:
generating a first reference voltage and a second reference voltage according to a driving power voltage, wherein the driving power voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage;
generating a plurality of gamma voltages according to the first reference voltage and the second reference voltage;
generating gray scale voltage corresponding to a plurality of binding point gray scales, each the lowest binding point gray scale in the binding point gray scales corresponds gray scale voltage is equal to driving power supply voltage, except that the lowest binding point gray scale is all the rest the binding point gray scale corresponds gray scale voltage is based on each gamma voltage obtains.
10. A display device comprising the display drive device according to any one of claims 1 to 8, and further comprising a display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310065964.3A CN115938305A (en) | 2023-01-16 | 2023-01-16 | Display driving device, display driving method, and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310065964.3A CN115938305A (en) | 2023-01-16 | 2023-01-16 | Display driving device, display driving method, and display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115938305A true CN115938305A (en) | 2023-04-07 |
Family
ID=86651054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310065964.3A Pending CN115938305A (en) | 2023-01-16 | 2023-01-16 | Display driving device, display driving method, and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115938305A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116597782A (en) * | 2023-07-14 | 2023-08-15 | 上海视涯技术有限公司 | Gamma voltage generating circuit, driving chip and near-eye display device |
-
2023
- 2023-01-16 CN CN202310065964.3A patent/CN115938305A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116597782A (en) * | 2023-07-14 | 2023-08-15 | 上海视涯技术有限公司 | Gamma voltage generating circuit, driving chip and near-eye display device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7872618B2 (en) | Control circuit for electronic devices, electronic circuit, electro-optical apparatus, driving method for electro-optical apparatus, electronic system, and control method for electronic devices | |
| US20050012700A1 (en) | Gamma correction circuit, liquid crystal driving circuit, display and power supply circuit | |
| KR101379938B1 (en) | Current drive display system | |
| KR100565390B1 (en) | Display device | |
| CN107274850B (en) | A kind of display driver circuit and its driving method, display device | |
| KR20070083846A (en) | Multi-line addressing methods and apparatus | |
| US10885851B2 (en) | AMOLED display panel and image display device | |
| US7525520B2 (en) | Electronic circuit, electro-optical device, method of driving electro-optical device, and electronic apparatus | |
| CN101290743A (en) | Active type matrix organic led circuit drive circuit possessing gamma correction | |
| JP3966333B2 (en) | Electro-optical device, driving method of electro-optical device, and electronic apparatus | |
| JP4216558B2 (en) | Display device and driving method thereof | |
| CN115938305A (en) | Display driving device, display driving method, and display device | |
| CN110534054B (en) | Display driving method and device, display device, storage medium and chip | |
| CN116453462A (en) | Display driving device, display driving method and display device | |
| US20040036702A1 (en) | Image display | |
| CN110570804A (en) | driving device and driving method of display panel and display device | |
| CN113920928B (en) | Display panel driver and display device | |
| CN113160761A (en) | Driving method, driving circuit and display device | |
| CN100479018C (en) | Driving circuit and driving method for display device | |
| JP2005148679A (en) | Display element, display device, semiconductor integrated circuit, and electronic equipment | |
| JP2003140614A (en) | Data line driving circuit | |
| US7079065B2 (en) | Digital-to-analog converter and the driving method thereof | |
| KR102626691B1 (en) | Apparatus for generating a nonlinear signal and display appartus usig the same | |
| CN116403514A (en) | Driving circuit for light-emitting diode display screen and light-emitting diode display screen thereof | |
| KR20120053858A (en) | Organic light emitting diode display device and method of driving the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |