CN109903733B - Display device and driving method thereof - Google Patents
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- CN109903733B CN109903733B CN201910290771.1A CN201910290771A CN109903733B CN 109903733 B CN109903733 B CN 109903733B CN 201910290771 A CN201910290771 A CN 201910290771A CN 109903733 B CN109903733 B CN 109903733B
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Abstract
The invention provides a display device, comprising a display panel, a plurality of pixel units and a plurality of pixel units, wherein the display panel comprises a plurality of pixels; further comprising: the driving module is used for providing driving voltage for each pixel so as to drive each pixel to emit light; the brightness detection module is used for detecting the actual brightness of each pixel; the compensation rule determining module is used for determining a voltage compensation rule corresponding to each pixel according to the difference between the actual brightness and the corresponding target brightness of each pixel in each frame of picture in the compensation stage; and the compensation module is used for compensating the driving voltage of the pixels according to the voltage compensation rule corresponding to each pixel and the target brightness to be displayed. The invention can improve the display effect of the display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device and a driving method thereof.
Background
In a high-resolution display device, the following problems may be caused: the scanning of all pixels is completed in the display stage of each frame of picture, so that the starting time of each line is very short, and the insufficient charging rate is easily caused, so that the pixel voltage cannot be maintained for a long time, and further, the effective pixel voltage of the pixels in the display stage cannot reach the target value, and the display effect is influenced. The effective pixel voltage can be increased by the overshoot technique, but after the display device is used for a long time, the mobility of the thin film transistor is drifted, and finally the effective pixel voltage is changed, so that the pixel cannot reach the target gray scale.
Disclosure of Invention
The present invention is directed to at least one of the problems of the prior art, and provides a display device and a driving method thereof.
In order to achieve the above object, the present invention provides a display device including a display panel including a plurality of pixels; the display device further includes:
the driving module is used for providing driving voltage for each pixel so as to drive each pixel to emit light;
the brightness detection module is used for detecting the actual brightness of each pixel;
the compensation rule determining module is used for determining a voltage compensation rule corresponding to each pixel according to the difference between the actual brightness and the corresponding target brightness of each pixel in each frame of picture in the compensation stage;
and the compensation module is used for compensating the driving voltage of the pixels according to the voltage compensation rule corresponding to each pixel and the target brightness to be displayed.
Optionally, an optical film is disposed on a light exit side of the display panel, the optical film is configured to transmit a part of incident light and reflect another part of the incident light, and a light transmission amount of the optical film is greater than a light reflection amount of the optical film;
the brightness detection module includes:
the photosensitive devices are arranged in one-to-one correspondence with the pixels and used for receiving the light rays reflected by the optical film and generating corresponding electric signals according to the received light rays;
and the calculating submodule is used for calculating the actual brightness of the corresponding pixel according to the electric signal generated by the photosensitive device.
Optionally, the optical film has a thickness of
The optical membrane is made of metal materials.
Optionally, the plurality of photosensitive devices are arranged in an array, and the brightness detection module further includes:
the device comprises a plurality of scanning lines, a plurality of detection transistors and a detection control unit, wherein each scanning line corresponds to a row of photosensitive devices, and each detection line corresponds to a column of photosensitive devices; the plurality of detection transistors and the plurality of photosensitive devices are arranged in a one-to-one correspondence manner;
the grid electrode of the detection transistor is connected with the scanning line corresponding to the row where the detection transistor is located, the first pole of the detection transistor is connected with the detection line corresponding to the column where the detection transistor is located, and the second pole of the detection transistor is connected with the corresponding photosensitive device;
the detection control unit is used for providing a detection signal to each scanning line in each frame of picture, wherein the detection signal comprises a first effective signal and a second effective signal with intervals; the time when the different scanning lines receive the detection signals is not overlapped;
the computing submodule is connected with each detection line and used for determining the electric signal generated by each photosensitive device according to the signal on each detection line.
Optionally, the display panel includes: the photosensitive device comprises an array substrate and a box aligning substrate which are oppositely arranged, wherein the photosensitive device is arranged between the array substrate and the box aligning substrate; or the photosensitive device is arranged on one side of the array substrate, which is far away from the box-to-box substrate.
Optionally, the compensation stage is a stage after the display device receives a compensation instruction, and the compensation stage includes a display stage of multiple frames of pictures, where target gray scales of any pixel in different frames of pictures are different;
the compensation rule determination module comprises:
the curve determining unit is used for determining an actual relation curve between the actual brightness of each pixel and the target gray scale according to the actual brightness of each pixel in each picture in the compensation stage;
and the compensation value determining unit is used for determining the voltage compensation value of each pixel according to the difference between the actual relation curve of each pixel and a preset standard relation curve of the target brightness and the target gray scale.
Optionally, the display stages of each frame of picture in the real-time display process of the display device are the compensation stages,
the display device further includes:
a storage module in which a compensation database for storing a plurality of voltage compensation values respectively corresponding to a plurality of target luminances is stored;
the updating module is used for adjusting and updating the voltage compensation value according to the difference between the actual brightness and the target brightness of the pixel when the actual brightness of the pixel is inconsistent with the target brightness; when the actual brightness of the pixel is consistent with the target brightness, storing the corresponding voltage compensation value into the compensation database;
the compensation module includes:
an initial voltage determining unit for determining an initial driving voltage of each pixel in a next frame picture of the compensation stage;
and the target voltage determining unit is used for determining a target driving voltage of each pixel, wherein for any pixel, when a voltage compensation value corresponding to the target gray scale of the pixel is stored in the compensation database, the initial driving voltage corresponding to the pixel is adjusted according to the voltage compensation value to obtain the target driving voltage.
Accordingly, the present invention also provides a driving method of a display device, the display device including a display panel including a plurality of pixels; the driving method includes:
in each frame of picture of the compensation stage, providing a driving voltage for each pixel to drive each pixel to emit light; and detecting the actual brightness of each pixel;
determining a voltage compensation rule corresponding to each pixel according to the difference between the actual brightness of each pixel in each frame of picture in the compensation stage and the corresponding target brightness;
and performing driving voltage compensation on the pixels according to the voltage compensation rule corresponding to each pixel and the target brightness to be displayed.
Optionally, the compensation stage is a stage after the display device receives a compensation instruction, the compensation stage includes multiple frames of pictures, and target gray scales of any pixel in different frames of pictures are different;
the step of determining the voltage compensation rule corresponding to each pixel according to the difference between the actual brightness of each pixel in each frame of picture in the compensation stage and the corresponding target brightness comprises:
determining an actual relation curve of the actual brightness of each pixel and the target gray scale according to the actual brightness of each pixel in each frame of picture in the compensation stage;
and determining the voltage compensation rule of each pixel according to the difference between the actual relation curve of each pixel and a preset standard relation curve of the target brightness and the target gray scale.
Optionally, the display stages of each frame of picture in the real-time display process of the display device are the compensation stages,
the driving method further includes:
establishing a compensation database for storing a plurality of voltage compensation values respectively corresponding to a plurality of target luminances;
the step of determining the voltage compensation rule corresponding to each pixel according to the difference between the actual brightness of each pixel in each frame of the compensation stage and the corresponding target brightness further comprises:
when the actual brightness of the pixel is inconsistent with the target brightness, adjusting and updating the voltage compensation value according to the difference between the actual brightness and the target brightness of the pixel; when the actual brightness of the pixel is consistent with the target brightness, storing the corresponding voltage compensation value into the compensation database;
the step of compensating the driving voltage of the pixel according to the voltage compensation rule corresponding to each pixel and the target brightness to be displayed comprises the following steps:
in the next frame of picture in the compensation stage, determining the initial driving voltage of each pixel according to the target brightness to be displayed of each pixel;
determining a target driving voltage of each pixel and providing the target driving voltage to a corresponding pixel unit; for any pixel, when a voltage compensation value corresponding to the target gray scale of the pixel is stored in the compensation database, the initial driving voltage corresponding to the pixel is adjusted according to the voltage compensation value to obtain the target driving voltage.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic block diagram of a display device according to the present invention;
FIG. 2 is a schematic diagram illustrating voltage variation on a pixel electrode when an overshoot technique is used to drive a display panel;
FIG. 3a is one of the cross-sectional views of the display panel and the optical film;
FIG. 3b is a second cross-sectional view of the display panel and the optical film;
FIG. 4 is a schematic diagram of the distribution of structures on the array substrate;
FIGS. 5a and 5b are response test charts of the PIN photodiode under different light intensity ranges respectively;
fig. 6 is a timing diagram of signals on gate lines and scan lines corresponding to two adjacent rows of pixels;
FIG. 7 is a block diagram of a display device according to some embodiments of the present invention;
FIG. 8 is a diagram illustrating a global shift of an actual luminance-grayscale relationship with respect to a standard relationship;
FIG. 9 is a schematic block diagram of a display device according to another embodiment of the present invention;
FIG. 10 is a flowchart illustrating a driving method of a display device according to the present invention;
FIG. 11a is a flow chart of a driving method in some embodiments of the invention;
FIG. 11b is a flow chart of a driving method according to another embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Currently, in naked eye 3D display, in order to obtain a finer viewing experience, high resolution is required, and whether the 3D display is a dual View (View) display, a multi View (View) display, or a light field display, the requirement for resolution is very high, and 2 times or more of the number of pixels of the 2D display is required. Thus, if the scanning of all pixels is to be completed within a fixed time (e.g., the display time of one frame of picture, i.e., 16.7ms in a display device with a frequency of 60 Hz), the on-time of each line is caused to be short. For a high-resolution display panel, the pixel storage capacitor is small, and the charging time is short, which may cause the pixel voltage not to be maintained for a long time, and thus the pixel may not reach the target gray scale.
Fig. 1 is a schematic block diagram of a display device according to the present invention, and as shown in fig. 1, the display device includes a display panel 10, a driving module 20, a brightness detection module 30, a compensation rule determination module 40, and a compensation module 50. The display panel 10 includes a plurality of pixels. The driving module 20 is configured to provide a driving voltage for each pixel according to a target gray scale to be displayed for each pixel in the to-be-displayed image, so as to drive each pixel to emit light. The brightness detection module 30 is used to detect the actual brightness of each pixel. The compensation rule determining module 40 is configured to determine a voltage compensation rule corresponding to each pixel according to a difference between an actual brightness of each pixel in each frame of the picture in the compensation phase and a corresponding target brightness, where the voltage compensation rule includes at least one compensation data, and the compensation data includes: target brightness and its corresponding voltage compensation value. The compensation module 50 is configured to perform driving voltage compensation on each pixel according to a voltage compensation rule corresponding to the pixel and a target luminance to be displayed, so that an actual luminance of the pixel is the same as or similar to the corresponding target luminance.
The compensation stage may be a stage of displaying one frame of picture, or a stage of displaying multiple frames of pictures. The voltage compensation value may be: the voltage value accumulated with the drive voltage may be a compensation coefficient multiplied with the drive voltage.
The display panel 10 may be a liquid crystal display panel, and a pixel electrode and a switching transistor are disposed in each pixel; the driving voltage supplied by the driving module 20 may include a pixel voltage supplied to the pixel electrode. In the display panel with lower resolution, the storage capacitance of the pixel is larger, the charging time is longer, and the pixel voltage can be well maintained, while for the display panel with higher resolution, the storage capacitance of the pixel is smaller, the charging time is very short, so that the pixel voltage cannot be maintained for a long time, therefore, when the display panel adopts a structure with higher resolution, the display panel can be driven by adopting an overshoot technology to display, that is, the pixel voltage is raised, so that the voltage on the pixel electrode is quickly raised in the charging stage when the switching transistor is turned on, as shown in fig. 2; in the holding stage of the switch transistor being turned off, the storage capacitor will leak continuously, and the effective pixel voltage in the period is consistent with the normal pixel voltage, so the purpose of normal display can be achieved. The overshoot voltage can be completed by gamma test before factory shipment.
However, during the use of the display panel, the switching transistor may age, causing the mobility of the switching transistor to drift, and thus causing the on-state current Ion of the switching transistor to vary. According to the charging voltage Vp ═ Ion × T/C of the pixel storage capacitor (where T is the charging time and C is the capacitance of the storage capacitor), the change of the on-state current Ion causes the charging voltage to change, and finally causes the effective pixel voltage to change, so that the pixel still cannot reach the target gray scale.
In the invention, when the actual brightness of a certain pixel in each frame picture in the compensation stage is not consistent with the corresponding target brightness, the driving voltage provided for the pixel after the compensation stage is adjusted according to the difference between the actual brightness and the target brightness, so that the actual brightness of the pixel is closer to or equal to the target brightness in the display picture after the compensation stage, namely, the gray scale of the pixel is close to or reaches the target gray scale, thereby improving the display effect.
Optionally, the display device is a liquid crystal display device, as shown in fig. 3a, the display panel 10 includes an array substrate 11 and a pair of cell substrates 12 that are disposed opposite to each other, and a liquid crystal layer 13 located therebetween, and a polarizer 14 is disposed on both a side of the array substrate 11 facing away from the pair of cell substrates 12 and a side of the pair of cell substrates 12 facing away from the array substrate 11. The display device further includes a backlight, and the display panel 10 is disposed on a light exit side of the backlight. As shown in fig. 4, the array substrate is provided with Gate lines (such as Gate1-1 and Gate1-2 in fig. 4) and Data lines Data, each Gate line (Gate1-1 and Gate1-2) corresponds to a row of pixels Data, and each Data line Data corresponds to a column of pixels. The gate of the switching transistor T1 in each pixel is connected to the gate line of the corresponding row, the first pole of the switching transistor T1 is connected to the corresponding Data line Data, and the second pole of the switching transistor T1 is connected to the corresponding pixel electrode 17. When each frame of picture is displayed, the driving module provides scanning signals to each grid line row by row, so that the switching transistor T1 is turned on row by row; each time the switching transistor T1 of a row is turned on, the driving module 20 provides a driving voltage to each column Data line Data, so as to transmit the driving voltage to the pixel electrode 17 of the scanned row of pixels.
In some embodiments, as shown in fig. 3a, the light-emitting side of the display panel 10 is provided with an optical film 16, the optical film 16 is used for transmitting a part of the incident light and reflecting another part of the incident light, and the light transmission amount of the optical film 16 is greater than the light reflection amount of the optical film 16. For example, the optical film 16 transmits 90% or more of light and reflects 10% or less of light.
To transmit most of the light, the optical film 16 may be made of metal and have a thickness
In the meantime. For example, a thickness of
The magnesium-aluminum alloy of (1).
The luminance detection module 30 includes: a computation submodule (not shown) and a plurality of light sensitive devices 31.
The plurality of photosensors 31 are provided in one-to-one correspondence with the plurality of pixels, the plurality of pixels are arranged in an array, and correspondingly, the plurality of photosensors 31 are arranged in an array. The photosensor 31 is used for receiving the light reflected by the optical diaphragm 16 and generating a corresponding electrical signal according to the received light. The light sensitive device 31 may specifically be a PIN photodiode. Fig. 5a and 5b are response test charts of the PIN photodiode under different light intensity ranges, respectively, wherein the photocurrent integration time of the PIN photodiode is 16.7ms (i.e., the time for displaying one frame of picture). As can be seen from fig. 5a and 5b, in the light intensity range of 0 to 300nit, the linearity of the PIN photodiode is good, the signal-to-noise ratio of the response can reach above 5:1 when the light intensity is 0.07nit, and it can be seen that the received light intensity can be calculated more accurately according to the electric signal generated by the PIN photodiode.
It should be noted that the light receiving surface of the photosensor 31 faces the optical film 16, and the surface of the photosensor 31 facing away from the optical film 16 is shielded from light so as to prevent interference from light from the backlight.
The computing sub-module is used for computing the actual brightness of the corresponding pixel according to the electric signal generated by the photosensitive device 31.
The calculating submodule may calculate the light intensity received by the photosensor 31 according to the electrical signal generated by the photosensor 31; then, the actual brightness of the pixel is determined based on the correspondence between the light intensity received by the photosensor 31 and the actual brightness of the pixel.
Wherein the correspondence between the intensity of light received by the light-sensing device 31 and the actual brightness of the pixel may be preset. Specifically, the actual brightness of the pixel may be detected by a CCD (charge coupled device image sensor) before shipment, and the correspondence between the light intensity received by the photosensitive device 31 and the actual brightness of the pixel may be determined by the actual brightness detected by the CCD and the light intensity actually received by the photosensitive device 31.
Further, the brightness detection module 30 further includes: a plurality of scanning lines (e.g., Gate2-1, Gate2-2 in fig. 4), a plurality of detection lines Sense, a plurality of detection transistors T2, and a detection control unit (not shown), each scanning line Gate2 corresponding to one row of photosensitive devices 31, and each detection line Sense corresponding to one column of photosensitive devices 31. The plurality of detection transistors T2 are provided in one-to-one correspondence with the plurality of photosensitive devices 31. The Gate of the detection transistor T2 is connected to the corresponding scan line Gate2-1/Gate2-2 of the row in which it is located, the first pole of the detection transistor T2 is connected to the corresponding detection line Sense of the column in which it is located, the second pole of the detection transistor T2 is connected to the first pole of the corresponding photosensor 31, and the second pole of the photosensor 31 is connected to the bias power supply terminal VD. The detection control unit is used for providing a detection signal to each scanning line Gate2-1 and Gate2-2 in each frame, wherein the detection signal comprises a first effective signal and a second effective signal with intervals; the time when the detection signals are received by different scanning lines is not overlapped. In addition, the first valid signal and the second valid signal are provided at the time after the scan signal is received by the corresponding row gate line.
A computation submodule is associated with each detection line Sense for determining the electrical signal generated by each photosensitive device 31 from the signal on each detection line Sense.
The first valid signal and the second valid signal are both valid signals for controlling the detection transistor T2 to turn on, and the detection transistor T2 is an N-type transistor in the present invention, and at this time, the first valid signal and the second valid signal are both high level signals. Fig. 6 is a timing chart of signals on Gate lines and scan lines corresponding to two adjacent rows of pixels, and as shown in fig. 6, the Gate lines (i.e., Gate lines Gate1-1 and Gate lines Gate1-2) corresponding to two rows of pixels receive the scan signals in sequence, so as to emit light in sequence; after the pixels emit light, the first effective signal and the second effective signal are provided to the corresponding scanning line Gate2-1/Gate2-2 of the pixels in the row, so that the detection transistor T2 in the pixel performs a photosensitive integration operation twice, and the phase between the first effective signal and the second effective signal is a photosensitive collection phase. For any pixel, when the detection transistor T2 of the pixel receives the first effective signal and the second effective signal, the computation submodule can receive the electrical signal generated by the photosensitive device 31, so as to determine the light intensity collected by the photosensitive device 31 according to the difference between the two electrical signals.
It should be noted that, since the driving module supplies the pixel voltage to the Data line Data when the scan signal is received on any one of the gate lines, when the detection line Sense is shared with the Data line Data, in order to prevent the pixel voltage and the electric signal generated by the photosensor 31 from interfering with each other, the detection signal (i.e., the high-level signal received on any one of the scan lines) does not overlap with the scan signal on any one of the gate lines.
In some embodiments, as shown in fig. 3a and 4, the photosensor 31 is disposed on the array substrate 11 and between the array substrate 11 and the opposing-box substrate 12. In FIG. 3a, the electronic device layer 15 is a structural layer including the photosensor 31, the scan lines (Gate2-1 and Gate2-2), and the detection line Sense. The scan lines (Gate2-1 and Gate2-2) may be disposed at the same layer as the Gate lines (Gate1-1 and Gate1-2), and the detection lines Sense and the Data lines Data corresponding to the pixels in the same column may be the same signal lines.
In other embodiments, as shown in FIG. 3b and FIG. 4, the electronic device layer 15 is a structural layer including the photosensitive devices 31, the scan lines (Gate2-1 and Gate2-2), and the detection lines Sense; the photosensor 31, the scan lines (Gate2-1 and Gate2-2), and the detection line Sense may all be disposed on a side of the array substrate 11 facing away from the counter cassette substrate 12.
In some embodiments, the compensation stage is a stage after the display device receives a compensation command, and the compensation stage includes multiple frames of frames, where the target gray levels of any pixel in different frames of frames are different. Specifically, when the display device receives the shutdown instruction or the standby instruction, the driving module provides a driving voltage for each pixel to drive the display panel to display a plurality of images with different gray scales, wherein the plurality of images with different gray scales are all pure-color images.
As shown in fig. 7, the compensation rule determining module 40 includes: a curve determination unit 41 and a compensation value determination unit 42. The curve determining unit 41 is configured to determine an actual relationship curve between the actual brightness of each pixel and the target gray scale by fitting according to the actual brightness of each pixel in each picture. The compensation value determining unit 42 is configured to determine a voltage compensation value of each pixel according to a difference between the actual relationship curve of each pixel and a preset standard relationship curve of the target luminance and the target gray scale.
As shown in fig. 8, the horizontal axis represents gray scale and the vertical axis represents luminance; the solid line is an actual relation curve of the brightness-gray scale determined according to the actual brightness and the target gray scale, and the dotted line is a standard relation curve of the brightness-gray scale. When the actual relationship curve is shifted integrally compared with the standard relationship curve (i.e. the actual relationship curve is identical to the standard relationship curve in shape, and the actual relationship curve is shifted relative to the standard relationship curve), the driving voltage is adjusted integrally in the process of displaying the picture after the compensation stage. For example, if the actual relationship curve is biased to the left compared to the standard relationship curve, it indicates that the mobility of the switching transistor is biased in the forward direction, so that the actual luminance is greater than the standard luminance, and at this time, the driving voltage needs to be reduced.
Specifically, two reference luminances Li1 and Li2 may be selected first, then two reference gray scales Gi1 and Gi2 corresponding to the two reference luminances Li1 and Li2, respectively, are determined according to an actual relationship curve, and two standard gray scales Gj1 and Gj2 corresponding to the two reference luminances Li1 and Li2, respectively, are determined according to a standard relationship curve; then, determining a voltage compensation value according to the difference value between the two reference gray scales Gi1 and the standard gray scale Gj1 and the difference value between the reference gray scale Gi2 and the standard gray scale Gj 2; integrally adjusting the driving voltage corresponding to each gray scale according to the voltage compensation value; then, driving the pixel to reach a third reference gray scale Gi3 according to the adjusted driving voltage, and determining whether the reference brightness Li3 corresponding to the third reference gray scale Gi3 is located on the standard relation curve, if so, indicating that the actual relation curve has overall deviation; otherwise, the actual relation curve is distorted.
When the actual relation curve of a certain pixel is distorted compared with the standard relation curve, namely, the shapes of the two relation curves are inconsistent, more than three calibration processes are sequentially executed, wherein each calibration process comprises the following steps: determining a new reference gray scale Gx; determining the brightness Lx corresponding to the reference gray scale Gx on the actual relation curve of brightness-gray scale and the brightness Ly corresponding to the standard relation curve of brightness-gray scale; compensating the driving voltage according to the difference value of the brightness Lx and the brightness Ly, and providing the compensated voltage for the pixel; detecting the actual brightness Lz of the pixel; and then, updating the actual relation curve of the current brightness-gray scale by using the reference gray scale Gx and the corresponding actual brightness Lz.
The above calibration process is performed a plurality of times until the luminance Lx and the luminance Ly coincide. When the driving voltage is compensated for by the difference between the luminance Lx and the luminance Ly, the pixel voltage is increased if the luminance Lx < Ly.
After the actual relation curve of the brightness-gray scale is determined, when the target brightness is displayed, voltage compensation is carried out according to the difference value of the actual gray scale corresponding to the target brightness on the actual relation curve and the standard gray scale corresponding to the standard relation curve.
In other embodiments, the display stages of each frame of picture in the real-time display process of the display device are compensation stages, that is, the driving voltage in the next frame of picture display stage is compensated according to the display state of each frame of picture.
In this case, as shown in fig. 9, the display device further includes: the storage module 60 stores a compensation database, and the compensation database is used for storing a plurality of voltage compensation values corresponding to a plurality of target luminances respectively, in the storage module 60. The updating module 70 is configured to, when the actual brightness of the pixel is inconsistent with the target brightness, adjust and update the voltage compensation value according to a difference between the actual brightness and the target brightness of the pixel; and when the actual brightness of the pixel is consistent with the target brightness, storing the corresponding voltage compensation value into a compensation database.
The compensation module 50 includes: an initial voltage determination unit 51 and a target voltage determination unit 52.
The initial voltage determining unit 51 is used to determine an initial driving voltage of each pixel in the next frame picture of the compensation phase.
The target voltage determining unit 52 is configured to determine a target driving voltage of each pixel, where for any pixel, when a voltage compensation value corresponding to a target gray scale of the pixel is stored in the compensation database, the initial driving voltage corresponding to the pixel is adjusted according to the voltage compensation value to obtain the target driving voltage, and the target driving voltage is provided to the corresponding pixel unit.
That is, when displaying the nth frame of picture, the initial voltage determining unit 51 determines the initial driving voltage corresponding to each pixel according to the target gray scale of each pixel; after that, the target voltage determining unit 52 determines the target driving voltage of each pixel; for any pixel, when a voltage compensation value corresponding to the target gray scale of the pixel is stored in the compensation database, adjusting the initial driving voltage corresponding to the pixel according to the voltage compensation value to obtain a target driving voltage; otherwise, the initial driving voltage is taken as the target driving voltage. Thereafter, a respective target drive voltage is provided for each pixel. Then, judging whether the actual brightness of each pixel is consistent with the target brightness corresponding to the target gray scale, if the actual brightness of the pixel is inconsistent with the target brightness, adjusting and updating the voltage compensation value according to the difference between the actual brightness and the target brightness of the pixel; and if the actual brightness of the pixel is consistent with the target brightness, storing the corresponding voltage compensation value into a compensation database.
The invention also provides a driving method of the display device, wherein the display device comprises a display panel, and the display panel comprises a plurality of pixels. FIG. 10 is a flowchart illustrating a driving method of a display device according to the present invention; as shown in fig. 10, the driving method of the display device includes:
s1, in each frame of picture of the compensation stage, providing a driving voltage for each pixel to drive each pixel to emit light; and detects the actual brightness of each pixel. The driving voltage can be provided by the driving module, and the actual brightness of the pixel can be detected by the brightness detection module.
And S2, determining a voltage compensation rule corresponding to each pixel according to the difference between the actual brightness and the corresponding target brightness of each pixel in each frame of picture in the compensation stage. This step S2 may be performed by the compensation rule determination module described above.
And S3, performing driving voltage compensation on the pixels according to the voltage compensation rule corresponding to each pixel and the target brightness to be displayed. This step S3 may be performed using the compensation module described above.
In some embodiments, the compensation is performed after receiving the compensation command, and the compensation stage includes multiple frames, and the target gray scale of any pixel is different in different frames. That is, the compensation stage is a stage after the display device receives the compensation command, and after the compensation command is received, the display panel is controlled to display a plurality of detection frames, in each detection frame, the target gray scale of each pixel may be the same, and the gray scales of different detection frames are different. The compensation command can be a shutdown command or a standby command. At this time, as shown in fig. 11a, the driving method of the display device includes the above steps S1 to S3, wherein the step S2 specifically includes:
and S21, determining an actual relation curve of the actual brightness of each pixel and the target gray scale according to the actual brightness of each pixel in each frame of picture in the compensation stage.
And S22, determining the voltage compensation value of each pixel according to the difference between the actual relation curve of each pixel and the preset standard relation curve of the target brightness and the target gray scale.
In this case, the actual relationship curve between the actual brightness of each pixel and the target gray scale may have a global shift or distortion compared with the standard relationship curve, and the determination process of the voltage compensation value in these two cases is already described above and is not repeated here.
In other embodiments, the compensation is performed in real time. That is, in the case where the display device displays each frame of the image in real time in a compensation phase, as shown in fig. 11b, the driving method of the display device includes the above steps S1 to S3, and further includes:
and S0, establishing a compensation database, wherein the compensation database is used for storing a plurality of voltage compensation values respectively corresponding to a plurality of target brightness.
Further, step S2 is followed by:
s4, when the actual brightness of the pixel is inconsistent with the target brightness, adjusting and updating the voltage compensation value according to the difference between the actual brightness and the target brightness of the pixel; when the actual brightness of the pixel is consistent with the target brightness, the corresponding voltage compensation value is stored in the compensation database.
The sequence of steps S3 and S4 is not limited.
Step S3 includes:
and S31, in the next frame of picture in the compensation stage, determining the initial driving voltage of each pixel according to the target brightness to be displayed of each pixel.
S32, determining a target driving voltage of each pixel, and providing the target driving voltage to a corresponding pixel unit; for any pixel, when a voltage compensation value corresponding to the target gray scale of the pixel is stored in the compensation database, the initial driving voltage corresponding to the pixel is adjusted according to the voltage compensation value to obtain the target driving voltage.
That is, when displaying the nth frame of picture, determining the initial driving voltage corresponding to each pixel according to the target gray scale of each pixel; then, determining a target driving voltage of each pixel; for any pixel, when a voltage compensation value corresponding to the target gray scale of the pixel is stored in the compensation database, adjusting the initial driving voltage corresponding to the pixel according to the voltage compensation value to obtain a target driving voltage; otherwise, the initial driving voltage is taken as the target driving voltage. Thereafter, a respective target drive voltage is provided for each pixel. Then, judging whether the actual brightness of each pixel is consistent with the target brightness corresponding to the target gray scale, if the actual brightness of the pixel is inconsistent with the target brightness, adjusting and updating the voltage compensation value according to the difference between the actual brightness and the target brightness of the pixel; and if the actual brightness of the pixel is consistent with the target brightness, storing the corresponding voltage compensation value into a compensation database.
In the present invention, when the actual brightness of a certain pixel in each frame of the compensation phase is not consistent with the corresponding target brightness, the driving voltage provided to the pixel after the compensation phase is adjusted according to the difference between the actual brightness and the target brightness, so that the actual brightness of the pixel in the display frame after the compensation phase is closer to or equal to the target brightness, that is, the actual gray scale of the pixel is closer to or reaches the target gray scale, thereby improving the display effect.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A display device includes a display panel including a plurality of pixels; characterized in that, the display device further comprises:
the driving module is used for providing driving voltage for each pixel so as to drive each pixel to emit light;
the brightness detection module is used for detecting the actual brightness of each pixel;
the compensation rule determining module is used for determining a voltage compensation rule corresponding to each pixel according to the difference between the actual brightness and the corresponding target brightness of each pixel in each frame of picture in the compensation stage;
the compensation module is used for compensating the driving voltage of each pixel according to the voltage compensation rule corresponding to the pixel and the target brightness to be displayed;
an optical diaphragm is arranged on the light-emitting side of the display panel, the optical diaphragm is used for transmitting one part of incident light and reflecting the other part of the incident light, and the light transmission amount of the optical diaphragm is greater than the light reflection amount of the optical diaphragm;
the brightness detection module includes:
the photosensitive devices are arranged in one-to-one correspondence with the pixels and used for receiving the light rays reflected by the optical film and generating corresponding electric signals according to the received light rays;
and the calculating submodule is used for calculating the actual brightness of the corresponding pixel according to the electric signal generated by the photosensitive device.
2. Root of herbaceous plantThe display device of claim 1, wherein the optical film has a thickness of
The optical membrane is made of metal materials.
3. The display device according to claim 1, wherein a plurality of the photosensitive devices are arranged in an array, and the brightness detection module further comprises:
the device comprises a plurality of scanning lines, a plurality of detection transistors and a detection control unit, wherein each scanning line corresponds to a row of photosensitive devices, and each detection line corresponds to a column of photosensitive devices; the plurality of detection transistors and the plurality of photosensitive devices are arranged in a one-to-one correspondence manner;
the grid electrode of the detection transistor is connected with the scanning line corresponding to the row where the detection transistor is located, the first pole of the detection transistor is connected with the detection line corresponding to the column where the detection transistor is located, and the second pole of the detection transistor is connected with the corresponding photosensitive device;
the detection control unit is used for providing a detection signal to each scanning line in each frame of picture, wherein the detection signal comprises a first effective signal and a second effective signal with intervals; the time when the different scanning lines receive the detection signals is not overlapped;
the computing submodule is connected with each detection line and used for determining the electric signal generated by each photosensitive device according to the signal on each detection line.
4. The display device according to claim 1, wherein the display panel comprises: the photosensitive device comprises an array substrate and a box aligning substrate which are oppositely arranged, wherein the photosensitive device is arranged between the array substrate and the box aligning substrate; or the photosensitive device is arranged on one side of the array substrate, which is far away from the box-to-box substrate.
5. The display device according to any one of claims 1 to 4, wherein the compensation stage is a stage after the display device receives a compensation command, the compensation stage includes a display stage of multiple frames, and a target gray scale of any pixel in different frames is different;
the compensation rule determination module comprises:
the curve determining unit is used for determining an actual relation curve between the actual brightness of each pixel and the target gray scale according to the actual brightness of each pixel in each picture in the compensation stage;
and the compensation value determining unit is used for determining the voltage compensation value of each pixel according to the difference between the actual relation curve of each pixel and a preset standard relation curve of the target brightness and the target gray scale.
6. The display device according to any one of claims 1 to 4, wherein the display phase of each frame of picture in the real-time display process of the display device is the compensation phase,
the display device further includes:
a storage module in which a compensation database for storing a plurality of voltage compensation values respectively corresponding to a plurality of target luminances is stored;
the updating module is used for adjusting and updating the voltage compensation value according to the difference between the actual brightness and the target brightness of the pixel when the actual brightness of the pixel is inconsistent with the target brightness; when the actual brightness of the pixel is consistent with the target brightness, storing the corresponding voltage compensation value into the compensation database;
the compensation module includes:
an initial voltage determining unit for determining an initial driving voltage of each pixel in a next frame picture of the compensation stage;
and the target voltage determining unit is used for determining a target driving voltage of each pixel, wherein for any pixel, when a voltage compensation value corresponding to the target gray scale of the pixel is stored in the compensation database, the initial driving voltage corresponding to the pixel is adjusted according to the voltage compensation value to obtain the target driving voltage.
7. A driving method of a display device, the display device including a display panel including a plurality of pixels; characterized in that the driving method comprises:
in each frame of picture of the compensation stage, providing a driving voltage for each pixel to drive each pixel to emit light; and detecting the actual brightness of each pixel;
determining a voltage compensation rule corresponding to each pixel according to the difference between the actual brightness of each pixel in each frame of picture in the compensation stage and the corresponding target brightness;
performing driving voltage compensation on the pixels according to the voltage compensation rule corresponding to each pixel and the target brightness to be displayed;
an optical diaphragm is arranged on the light-emitting side of the display panel, the optical diaphragm is used for transmitting one part of incident light and reflecting the other part of the incident light, and the light transmission amount of the optical diaphragm is greater than the light reflection amount of the optical diaphragm; the display device further includes: a plurality of photosensitive devices arranged in one-to-one correspondence with the plurality of pixels, the photosensitive devices being configured to receive light reflected by the optical film and generate corresponding electrical signals according to the received light
The detecting the actual brightness of each pixel comprises:
and calculating the actual brightness of the corresponding pixel according to the electric signal generated by the photosensitive device.
8. The driving method as claimed in claim 7, wherein the compensation stage is a stage after the display device receives a compensation command, the compensation stage includes multiple frames, and the target gray levels of any pixel are different in different frames;
the step of determining the voltage compensation rule corresponding to each pixel according to the difference between the actual brightness of each pixel in each frame of picture in the compensation stage and the corresponding target brightness comprises:
determining an actual relation curve of the actual brightness of each pixel and the target gray scale according to the actual brightness of each pixel in each frame of picture in the compensation stage;
and determining the voltage compensation rule of each pixel according to the difference between the actual relation curve of each pixel and a preset standard relation curve of the target brightness and the target gray scale.
9. The driving method according to claim 7, wherein the display phase of each frame of the image displayed by the display device in real time is the compensation phase,
the driving method further includes:
establishing a compensation database for storing a plurality of voltage compensation values respectively corresponding to a plurality of target luminances;
the step of determining the voltage compensation rule corresponding to each pixel according to the difference between the actual brightness of each pixel in each frame of the compensation stage and the corresponding target brightness further comprises:
when the actual brightness of the pixel is inconsistent with the target brightness, adjusting and updating the voltage compensation value according to the difference between the actual brightness and the target brightness of the pixel; when the actual brightness of the pixel is consistent with the target brightness, storing the corresponding voltage compensation value into the compensation database;
the step of compensating the driving voltage of the pixel according to the voltage compensation rule corresponding to each pixel and the target brightness to be displayed comprises the following steps:
in the next frame of picture in the compensation stage, determining the initial driving voltage of each pixel according to the target brightness to be displayed of each pixel;
determining a target driving voltage of each pixel and providing the target driving voltage to a corresponding pixel unit; for any pixel, when a voltage compensation value corresponding to the target gray scale of the pixel is stored in the compensation database, the initial driving voltage corresponding to the pixel is adjusted according to the voltage compensation value to obtain the target driving voltage.
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| CN110459159B (en) * | 2019-08-15 | 2021-08-31 | 成都辰显光电有限公司 | Display device and driving method thereof |
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