TWI427593B - Organic light-emitting diode display module, organic light-emitting diode display apparatus and image compensation methods thereof - Google Patents

Description

Organic light emitting diode display module, organic light emitting diode display device and image compensation method thereof

The invention relates to a display module, a display device and an image compensation method thereof, in particular to an organic light emitting diode display module, an organic light emitting diode display device and an image compensation method thereof.

Organic light-emitting diode (OELD) has the advantages of self-luminous, high brightness, high contrast, light weight, low power consumption and fast response. It has been gradually applied to various display image systems, such as organic light-emitting. Diode display device. The organic light emitting diode display device can be divided into a passive matrix organic light emitting diode display device and an active matrix organic light emitting diode display device according to the driving mode of the organic light emitting diode. . Among them, since the passive matrix type organic light emitting diode display device is limited to the driving mode and has a short life, the active matrix organic light emitting diode display device can be applied to high performance and large size display applications.

The active matrix organic light emitting display device can be driven using an amorphous silicon (a-Si) transistor or a low temperature poly silicon (LTPS) transistor. The advantage of using an amorphous germanium transistor process is that the characteristics of the respective transistors produced are relatively similar. The above-mentioned characteristics are, for example, the threshold voltage and electron mobility parameters of the element. However, the critical voltage and electron mobility parameters of the component may drift over time, resulting in longitudinal rips on the display.

When a low-temperature polycrystalline germanium transistor process is used, since the grain of the polycrystalline germanium is larger than that of the amorphous germanium, defects can be reduced and high carrier mobility can be obtained. And the smaller volume of the low temperature polycrystalline germanium transistor can increase the aperture ratio of the pixel. In addition, since the low-temperature polycrystalline germanium transistor has a high carrier mobility, a part of the organic light-emitting diode display panel peripheral driving circuit can be simultaneously fabricated on the glass substrate along with the low-temperature polycrystalline germanium transistor process, thereby greatly reducing the number of wires, and Thereby, the characteristics and reliability of the organic light emitting diode display panel are greatly improved, and the manufacturing cost of the organic light emitting diode display panel is greatly reduced. However, due to the manufacturing problem of the low-temperature polycrystalline germanium transistor, the characteristics of each low-temperature polycrystalline germanium transistor may be slightly different, which may cause vertical ripple of the display image.

In order to solve the problem of longitudinal corrugation, the prior art proposes a method of data voltage compensation, which is to store the threshold voltage and electron mobility parameters of the complex pixels of the organic light-emitting diode display panel when displaying each gray scale, and The threshold voltage and electron mobility parameters of the pixels compensate for the pixel data input to each pixel, so that each pixel displays the correct color. However, the disadvantage of this approach is that a large memory space is required to store a large amount of data.

Therefore, how to provide an organic light-emitting diode display module, an organic light-emitting diode display device and an image compensation method capable of reducing the memory space and displaying the correct color is one of the current important topics.

In view of the above problems, an object of the present invention is to provide an organic light emitting diode display module, an organic light emitting diode display device, and an image compensation method thereof that can reduce a memory space and display a correct color.

To achieve the above objective, the present invention provides an image compensation method for an organic light emitting diode display module, wherein the organic light emitting diode display module has an organic light emitting diode display panel, and the organic light emitting diode display panel has At least one pixel. The image compensation method comprises the steps of: inputting a target gray scale; obtaining a target gray scale current value from a current comparison table and a target gray scale; obtaining an electron mobility parameter corresponding to the pixel from a compensation comparison table; The gray scale current value and the electron mobility parameter are used to calculate a voltage value of a target gray scale; and a compensation circuit outputs a compensation signal according to the voltage value of the target gray scale.

To achieve the above objective, the present invention provides an organic light emitting diode display module including an organic light emitting diode display panel, an image processing circuit, and a compensation circuit. The organic light emitting diode display panel has at least one pixel. The image processing circuit is electrically connected to the organic light emitting diode display panel and has a first memory unit and an arithmetic unit. The first memory unit stores one of the electron mobility parameters corresponding to the pixel. The computing unit is electrically connected to the first memory unit, and obtains a voltage value of a target gray level according to a target current value and an electron mobility parameter. The compensation circuit is electrically connected to the pixel and outputs a compensation signal according to the voltage value of the target gray level.

To achieve the above objective, the present invention provides an image compensation method for an organic light emitting diode display device, wherein the organic light emitting diode display device has an organic light emitting diode display module, and the organic light emitting diode display module has An organic light emitting diode display panel having an organic light emitting diode display panel having at least one pixel. The image compensation method comprises the steps of: inputting a target gray scale; obtaining a target gray scale current value from a current comparison table and a target gray scale; obtaining an electron mobility parameter corresponding to the pixel from a compensation comparison table; The gray scale current value and the electron mobility parameter are used to calculate a voltage value of a target gray scale; and a compensation circuit outputs a compensation signal according to the voltage value of the target gray scale.

To achieve the above objective, the present invention provides an organic light emitting diode display device including an organic light emitting diode display panel, an image processing circuit, and a compensation circuit. The organic light emitting diode display panel has at least one pixel. The image processing circuit is electrically connected to the organic light emitting diode display panel and has a first memory unit and an arithmetic unit. The first memory unit stores one of the electron mobility parameters corresponding to the pixel. The computing unit is electrically connected to the first memory unit, and obtains a voltage value of a target gray level according to a target current value and an electron mobility parameter. The compensation circuit is electrically connected to the pixel and outputs a compensation signal according to the voltage value of the target gray level.

According to the present invention, an organic light emitting diode display module, an organic light emitting diode display device, and an image compensation method thereof are obtained by using an electron mobility parameter and a target gray scale to obtain a target gray scale voltage. The value is compensated according to the voltage value of the target gray scale by the compensation circuit to output the compensation signal to compensate the pixel data of the input pixel, so that each pixel displays the correct color. Compared with the prior art, the image compensation method of the organic light emitting diode display device of the present invention simultaneously compensates the pixel data of the input pixel by means of data processing and the compensation circuit to reduce the data to be stored, thereby reducing Memory space.

Hereinafter, an organic light emitting diode display module, an organic light emitting diode display device, and an image compensation method thereof according to a preferred embodiment of the present invention will be described with reference to related drawings.

As shown in FIG. 1 , the organic light emitting diode display module 1 of the preferred embodiment of the present invention comprises an organic light emitting diode display panel 2 , an image processing circuit 3 , and a compensation circuit 4 .

In the present embodiment, the organic light-emitting diode display panel 2 is exemplified by a low-temperature polysilicon transistor driving. Therefore, the organic light-emitting diode display panel 2 needs to be compensated at the time of shipment to improve display quality.

The image processing circuit 3 is electrically connected to the organic light emitting diode display panel 2 and includes an arithmetic unit 31 and a first memory unit 32. The first memory unit 32 is electrically connected to the computing unit 31 and has a compensation comparison table. The compensation comparison table stores one electron mobility parameter corresponding to one of the pixels of the organic light-emitting diode display panel 2.

As shown in FIG. 1 , the image processing circuit 3 further includes a second memory unit 33 and a measuring unit 34 . The second memory unit 33 and the measuring unit 34 are electrically connected to the arithmetic unit 31, respectively, and the second memory unit 33 has a current comparison table.

The compensation circuit 4 is used to compensate the organic light emitting diode display panel 2. The compensation method will be described in detail below. As shown in FIG. 1, the scan lines S ₁ to S _m and the data lines D ₁ to D _n are staggered and form corresponding interlaced regions, and can be set in each interlaced region. Corresponding pixels P ₁₁ to P _mn . Continuing from pixels P ₁₁ will be described as an example, please refer to FIG. 2, pixels P ₁₁ comprises a scanning transistor 21, a display 22, a storage capacitor 23, and an OLED element control transistor OD . The compensation circuit 4 is electrically connected to the pixel P ₁₁ and has a compensation transistor 41.

The first end of the scanning transistor 21 is electrically connected to the control end of the compensation transistor 41 and one end of the storage capacitor 23, and the second end of the scanning transistor 21 and the second end of the compensation transistor 41 and the display control circuit The second end of the crystal 22 is electrically connected. The first end of the compensation transistor 41 and the other end of the storage capacitor 23 are electrically connected to the power source V ₁ , respectively. The second end of the display control transistor 22 is electrically connected to one end of the organic light emitting diode element OD to turn on the organic light emitting diode element OD. The other end of the organic light emitting diode element OD is electrically connected to another power source V ₂ .

In the present embodiment, the scanning transistor 21, the compensation transistor 41, and the display control transistor 22 are exemplified by a P-type transistor, and the control terminal is a gate, the first end is a source, and the second end is a 汲. pole. In addition, the power source V ₂ provides a reference voltage, for example, a voltage value of -10 volts.

The pixel and compensation circuit of the organic light-emitting diode display module 1 of the present invention is exemplified by FIG. 2, but is not used to limit the present invention, and the variation of the pixel and the compensation circuit can be further illustrated in FIG. 3 to As shown in FIG. 8, the connection structure of each component and circuit will not be described in detail.

Referring to FIG. 1 again, the OLED display module 1 of the present embodiment further includes a data driving circuit 5, a scan driving circuit 6, and a timing control circuit 7. The timing control circuit 7 system and the image processing circuit 3, the data driving circuit 5, and 6 are electrically scan driving circuit, data driver circuit 5 train via a plurality of data lines D ₁ ~ D _n and the OLED display 2 is electrically panel connector The scan driving circuit 6 is electrically connected to the organic light emitting diode display panel 2 via the plurality of scanning lines S ₁ to S _m .

The image compensation method of the organic light emitting diode display module according to the preferred embodiment of the present invention includes steps S11 to S13 and steps S21 to S25. Hereinafter, please refer to FIG. 1 , FIG. 9A and FIG. 9B simultaneously.

First of all, the image compensation method of the organic light emitting diode display module 1 can be divided into a measurement phase and a display phase. The measurement phase can be performed during the production of the organic light emitting diode display panel 2 or before leaving the factory, or when the organic light emitting diode display panel 2 is turned on to store information required for image compensation. Hereinafter, the measurement phase will be described first, as shown in FIG. 9A. In the measurement phase, the image compensation method includes steps S11 to S13.

In step S11, a reference gray scale GL _R is input to the organic light emitting diode display panel 2. In the present embodiment, the organic light-emitting diode display panel 2 has a plurality of pixels P ₁₁ to P _mn . Here, the pixel P _{11 is taken} as an example. The timing control circuit 7 inputs the reference gray scale GL _R to the data driving circuit 5 and the scan driving circuit 6, and outputs a corresponding voltage or current via the scan driving circuit 6 to drive the painting of the organic light emitting diode display panel 2. P ₁₁ . The data driving circuit 5 can output a voltage value V _{DATA1 of the} reference gray level GL _R . Here, the gray scale value of the reference gray scale GL _R is not limited, that is, the gray scale value of the reference gray scale GL _R may be 0 to 255.

In step S12, the reference current value I _R corresponding to the reference gray scale GL _R in the organic light emitting diode display panel 2 is measured. In the present embodiment, the measuring unit 34 measures the reference current value I _{R of the} reference gray scale GL _R in the pixel P ₁₁ of the organic light emitting diode display panel 2 . In addition, in different embodiments, the measuring unit 34 can also be integrated into the data driving circuit 5.

In step S13, the electron mobility parameter is calculated according to the reference current value I _R and the reference gray scale GL _R . In the present embodiment, the reference current value I _{R is} input to the arithmetic unit 31, and the reference current value I _R conforms to the following relationship:

I _R = K × μ × ( V _DD - V _{DATA 1} ) ² ,

Where K is a constant, V _DATA1 is the voltage value of the reference gray level GL _R , V _DD is the power signal, and μ is an electron mobility parameter. At this time, the electronic mobility parameter μ can be calculated via the above relational expression via the operation unit 31 and stored in the compensation comparison table in the first memory unit 32.

Next, as shown in FIG. 9B, in the display phase, the image compensation method includes steps S21 to S25. Here, only the pixel P _{11 is taken} as an example.

In step S21, a target gray level GL _T is input. In this embodiment, the timing control circuit 7 inputs the target gray scale GL _T to the operation unit 31, wherein the target gray scale GL _T is the gray scale value displayed by the system original desired display panel, taking the 8-bit element as an example, the target gray scale The gray scale value of GL _T can be 0 to 255.

Step S22, the target system to obtain a gray level current value I _T and the target table by the current grayscale GL _T. In the embodiment, the operation unit 31 obtains the target gray-scale current value I _T corresponding to the target gray scale GL _T according to the current comparison table of the second memory unit 33.

In step S23, an electron mobility parameter corresponding to the pixel is obtained from the compensation comparison table. In the present embodiment, the compensation comparison table of the first memory unit 32 is read via the operation unit 31 to obtain an electron mobility parameter μ corresponding to the pixel P ₁₁ .

In step S24, the target gray scale current value I _T and the electron mobility parameter μ are used to calculate the voltage value V _{DATA2 of the} target gray scale GL _T . In this embodiment, the target gray scale current value I _T and the voltage value V _{DATA2 of the} target gray scale GL _T satisfy the following relationship:

I _T = K × μ × ( V _DD - V _{DATA 2} ) ² ,

The target gray scale current value I _T , the constant K, the electron mobility parameter μ, and the power signal V _DD are all known. Therefore, the voltage value V _DATA2 of the target gray scale GL _T can be calculated by the above relation.

In addition, the voltage value V _DATA2 of the target gray scale GL _T is an analog form, and therefore needs to be converted into a digital form to be input to the organic light emitting diode display panel 2. At this time, the arithmetic unit 31 obtains the voltage value of a target gray scale in the form of a digital number according to the analog digital comparison table and the voltage value V _{DATA2 of the} target gray scale GL _T , and transmits the voltage value to the organic light emitting diode display panel 2 . .

In step S25, the compensation circuit 4 outputs a compensation signal according to the voltage value V _{DATA2 of the} target gray scale GL _T , thereby compensating the organic light emitting diode display panel 2 .

Hereinafter, the manner in which the compensation circuit 4 compensates the organic light-emitting diode display panel 2 will be described in detail. As shown in FIG. 1, the scan lines S ₁ to S _m and the data lines D ₁ to D _n are staggered, and corresponding interlaced regions are formed, and corresponding pixels P ₁₁ can be set in each interlaced region. P _mn .

Referring to FIG. 10, the voltage compensation method of the pixel P ₁₁ includes steps S31 to S34. Below, FIGS. 1, 2, 10 and 11 illustrate the voltage compensation method of the present embodiment, wherein FIG. 11 is a timing control diagram of the pixel P _11.

Step S31, the first based on a time t _11, the transistor 21 is turned on scanning, the display control transistor 22 and transistor 41 to reset compensating the storage capacitor 23 of the charge amount. In this embodiment, the control terminal of the scan transistor 21 receives a scan signal S _L1 , and the control terminal of the display control transistor 22 receives a display control signal S _C . Here, a scan signal S _L1 of a low level voltage and a display control signal S _{C of} a low level voltage are respectively input to turn on the scan transistor 21 and the display control transistor 22. The scan signal S _L1 and the display control signal S _{C are,} for example, -10V.

Since both the scanning transistor 21 and the display control transistor 22 are in an on state, the voltage level of the control terminal of the compensation transistor 41 is similar to the voltage level of the second power source V ₂ to turn on the compensation transistor 41. At this time, the storage capacitor 23 can also be provided with a discharge path to reset the charge in the storage capacitor 23.

Step S32, based on a second time t _12, transistor 21 is turned off and the display scanning control transistor 22, while transistor 41 is turned on to compensate. In the present embodiment, during the second time t ₁₂ , the scan transistor 21 and the display control transistor 22 are turned off, and a voltage value V _DATA2 of the target gray scale GL _T of 0 V, for example, is input to the compensation transistor 41. At one end, the control terminal voltage of the compensation transistor 41 has a voltage difference from its first terminal voltage to maintain the conduction state.

Step S33 based on the second time t _12, the compensation transistor 41 is turned on and the transistors 21 and scanning the display control transistor 22 is turned off. At the same time, the voltage value V _{DATA2 of the} target gray scale GL _T is input to the compensation transistor 41, so that the node voltage of the storage capacitor 23 and the compensation transistor 41 is a compensation voltage. In the present embodiment, when the compensation transistor 41 and the scanning transistor 21 are turned on and the display control transistor 22 is turned off, the voltage value V _DATA2 of the target gray scale GL _T of, for example, 5 V is input to the compensation transistor 41. One end, and due to the threshold voltage effect of the scanning transistor 21. Therefore, the node voltage of the storage capacitor 23 and the compensation transistor 41 is a compensation voltage of V _DATA2 -|V _th |. Where V _th is the threshold voltage of the scanning transistor 21 .

Step S34 based on a third time t _13, turned compensation transistor 41 and a display control transistor 22 and turns off the scanning transistor 21, while a power signal V _DD is input to via the compensation transistor 41 OLED element OD . In this embodiment, the power source provides power signal V ₁ to V _DD input terminal of the first compensating transistor 41 and storage capacitor 23 in the same amount of stored charge to enabling compensation voltage compensating transistor control terminal 41 is maintained Is V _DATA2 -|V _th |. At this time, the voltage difference V _sg between the first end of the compensation transistor 41 and the control terminal is as follows:

V _sg = V _s - V _g = V _DD -( V _{DATA 2} -| V _th |)

Moreover, the on-current formula of the organic light-emitting diode element OD is as follows:

I = K × μ × ( V _sg - | V _th |) ² = K × μ × ( V _DD - V _{DATA 2} ) ²

From the above equation, regardless of the current I and the scanning parameters transistor 21 threshold voltage V _th, and thus according to present invention P ₁₁ pixels and the compensation voltage method may eliminate the threshold voltage of the display quality.

In addition to performing the above image compensation method on the organic light emitting diode display panel at the time of shipment, the organic light emitting diode display panel can be compensated when the user turns on the device, thereby improving the display of the organic light emitting diode display panel. Like quality.

In addition, the organic light emitting diode display device of the preferred embodiment of the present invention includes an organic light emitting diode display panel and an image processing circuit. The organic light emitting diode display panel has at least one pixel. The image processing circuit is electrically connected to the organic light emitting diode display panel, and has a first memory unit, an arithmetic unit and a compensation circuit. The first memory unit stores one of the electron mobility parameters corresponding to the pixel. The computing unit is electrically connected to the first memory unit, and obtains a voltage value of a target gray level according to a target current value and an electron mobility parameter. The compensation circuit is electrically connected to the pixel and outputs a compensation signal according to the voltage value of the target gray level. Since the organic light emitting diode display panel and the image processing circuit have been described in detail, they will not be described again.

In summary, the organic light emitting diode display module, the organic light emitting diode display device and the image compensation method thereof according to the present invention obtain the voltage of the target gray scale by using the electron mobility parameter and the target gray scale. The value is compensated according to the voltage value of the target gray scale by the compensation circuit to output the compensation signal to compensate the pixel data of the input pixel, so that each pixel displays the correct color. Compared with the prior art, the image compensation method of the organic light emitting diode display device of the present invention simultaneously compensates the pixel data of the input pixel by means of data processing and the compensation circuit to reduce the data to be stored, thereby reducing Memory space.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1. . . Organic light emitting diode display module

2. . . Organic light emitting diode display panel

twenty one. . . Scanning transistor

twenty two. . . Display control transistor

twenty three. . . Storage capacitor

3. . . Image processing circuit

31. . . Arithmetic unit

32. . . First memory unit

33. . . Second memory unit

34. . . Measuring unit

4. . . Compensation circuit

41. . . Compensation transistor

5. . . Data drive circuit

6. . . Scan drive circuit

7. . . Timing control circuit

D ₁ ~ D _n . . . Data line

GL _R . . . Reference gray scale

GL _T . . . Target grayscale

I _R . . . Reference current value

I _T . . . Target gray scale current value

OD. . . Organic light emitting diode element

P ₁₁ ~ P _mn . . . Pixel

S ₁ ~ S _m . . . Scanning line

S11～S13, S21～S25, S31～S34. . . step

S _C . . . Display control signal

S _L1 . . . Scanning signal

t ₁₁ ~ t _13. . . time

V ₁ , V ₂ . . . power supply

V _DD . . . Power signal

μ. . . Electron mobility parameter

1 is a schematic diagram of an organic light emitting diode display module according to a preferred embodiment of the present invention;

2 is a schematic diagram of the pixel and the compensation circuit of FIG. 1;

3 to 8 are schematic diagrams showing changes of the pixel and the compensation circuit;

9A and FIG. 9B are flowcharts of an image compensation method of an organic light emitting diode display module according to a preferred embodiment of the present invention;

10 is a flow chart of a voltage compensation method of the pixel and the compensation circuit of FIG. 2;

Figure 11 is a timing diagram of the pixel of Figure 2.

S21～S25. . . Steps of image compensation method for organic light emitting diode display module

Claims (18)

An image compensation method for an organic light emitting diode display module, the organic light emitting diode display module having an organic light emitting diode display panel, the organic light emitting diode display panel having at least one pixel, the image compensation The method comprises the steps of: inputting a target gray scale; obtaining a target gray scale current value from a current comparison table and the target gray scale; obtaining an electron mobility parameter corresponding to the pixel from a compensation comparison table; The target gray scale current value and the electron mobility parameter are used to calculate a voltage value of a target gray scale; and a compensation circuit outputs a compensation signal according to the voltage value of the target gray scale. The image compensation method according to claim 1, further comprising the steps of: inputting a reference gray scale to the organic light emitting diode display panel; measuring the corresponding organic light emitting diode display panel, corresponding to the gray a reference current value of the order; and calculating the electron mobility parameter according to the reference current value and the reference gray scale. The image compensation method according to claim 1, further comprising the step of converting the voltage value of the target gray scale of the analog form into a voltage value of the target gray scale of the digital form. An image compensation method for an organic light emitting diode display device, the organic light emitting diode display device having an organic light emitting diode display module, the organic light emitting diode display module having an organic light emitting diode display panel The organic light emitting diode display panel has at least one pixel, and the image compensation method comprises the steps of: inputting a target gray scale; obtaining a target gray scale current value from a current comparison table and the target gray scale; The comparison table obtains an electron mobility parameter corresponding to the pixel; the target gray scale current value and the electron mobility parameter are used to calculate a target gray scale voltage value; and a compensation circuit is used according to the target gray scale The voltage value outputs a compensation signal. The image compensation method according to claim 4, further comprising the steps of: inputting a reference gray scale to the organic light emitting diode display panel; measuring the corresponding organic light emitting diode display panel, corresponding to the gray a reference current value of the order; and calculating the electron mobility parameter according to the reference current value and the reference gray scale. The image compensation method according to claim 4, further comprising the step of converting the voltage value of the target gray scale of the analog form into a voltage value of the target gray scale of the digital form. An organic light emitting diode display module includes: an organic light emitting diode display panel having at least one pixel; an image processing circuit electrically connected to the organic light emitting diode display panel, the image processing circuit having a first memory unit storing an electron mobility parameter corresponding to the pixel; and an operation unit electrically connected to the first memory unit and obtained according to a target current value and the electron mobility parameter a voltage value of the target gray level; and a compensation circuit electrically connected to the pixel and outputting a compensation signal according to the voltage value of the target gray level. The organic light emitting diode display module of claim 7, wherein the first memory unit has a compensation comparison table that stores the electron mobility parameter corresponding to the pixel. The organic light emitting diode display module of claim 7, wherein the first memory unit further has an analog digital comparison table, which stores the voltage value and the digital form of the target gray scale in an analog form. The relationship between the voltage values of a target gray scale. The OLED display module of claim 7, wherein the image processing circuit further comprises: a second memory unit electrically connected to the computing unit and having a current comparison table A relationship between a target gray level and the target gray level current value is stored. The organic light emitting diode display module of claim 7, further comprising: a data driving circuit electrically connected to the organic light emitting diode display panel via a plurality of data lines; and a scan driving circuit, The organic light emitting diode display panel is electrically connected by a plurality of scan lines. The OLED display module of claim 7, wherein the image processing circuit further comprises: a measuring unit that measures a reference current value of the organic light emitting diode display panel, wherein the The arithmetic unit calculates the electron mobility parameter according to the voltage value of a reference gray scale and the reference current value. An organic light emitting diode display device includes: an organic light emitting diode display panel having at least one pixel; and an image processing circuit electrically connected to the organic light emitting diode display panel, the image processing circuit having: a first memory unit storing an electron mobility parameter corresponding to the pixel; and an operation unit electrically connected to the first memory unit and obtaining a signal according to a target current value and the electron mobility parameter a voltage value of the target gray level; and a compensation circuit electrically connected to the pixel and outputting a compensation signal according to the voltage value of the target gray level. The organic light emitting diode display device of claim 13, wherein the first memory unit has a compensation comparison table that stores the electron mobility parameter corresponding to the pixel. The organic light emitting diode display device of claim 13, wherein the first memory unit further has an analog digital comparison table, which stores an analog analog form of the target gray scale voltage value and digital form The relationship between the voltage values of the target gray levels. The OLED display device of claim 13, wherein the image processing circuit further comprises: a second memory unit electrically connected to the computing unit and having a current comparison table for storing The relationship between a target gray level and the target gray level current value. The organic light emitting diode display device of claim 13, further comprising: a data driving circuit electrically connected to the organic light emitting diode display panel via a plurality of data lines; and a scan driving circuit The organic light emitting diode display panel is electrically connected to the plurality of scan lines. The OLED display device of claim 13, wherein the image processing circuit further comprises: a measuring unit that measures a reference current value of the organic light emitting diode display panel, wherein the operation The unit calculates the electron mobility parameter according to the voltage value of a reference gray scale and the reference current value.