KR102495716B1 - Module and method for compensating definition of display apparatus - Google Patents

Abstract

The present invention relates to a picture quality compensation module and method of a display device, and more particularly, to determine a compensation method for compensating for a change in electrical characteristics of a driving TFT based on a temperature of a display panel, and to determine a final compensation parameter according to the determined compensation method. A picture quality compensating module and method of a display device for compensating for a final data voltage applied to a driving TFT by generating An image quality compensation module according to an embodiment of the present invention may include a determining unit, a generating unit, and a calculating unit. According to the picture quality compensation module according to an embodiment of the present invention, the picture quality compensation of the display can be effectively performed by determining the compensation method based on the temperature of the display panel.

Description

Picture quality compensation module and method of display device {Module and method for compensating definition of display apparatus}

The present invention relates to a picture quality compensation module and method of a display device, and more particularly, to determine a compensation method for compensating for a change in electrical characteristics of a driving TFT based on a temperature of a display panel, and to determine a final compensation parameter according to the determined compensation method. A picture quality compensation module and method of a display device for compensating for a final data voltage applied to a driving TFT.

Flat Panel Displays to replace the existing Cathode Ray Tube display devices include Liquid Crystal Display, Field Emission Display, and Plasma Display Panel. ) and Organic Light-Emitting Diode Display (OLED Display).

Among them, an organic light emitting diode included in an organic light emitting display device has characteristics of high luminance and low operating voltage, and since it is a self-emitting type that emits light by itself, it has a high contrast ratio and is easy to implement an ultra-thin display. In addition, the response time is about several microseconds (μs), so it is easy to implement a moving image, there is no restriction on the viewing angle, and it is stable even at low temperatures.

1 is an equivalent circuit diagram of a pixel PX and a sensing circuit SC of a conventional organic light emitting display device.

Referring to FIG. 1 , the pixel PX is driven by receiving the high-potential driving voltage EVDD and generates the driving current Ids of the organic light emitting diode OLED according to the data voltage Vdata applied to the gate terminal. It includes a driving TFT (DR-TFT). Also, the pixel PX includes a scan TFT (SC-TFT) that applies the data voltage Vdata to the gate terminal of the driving TFT (DR-TFT) in response to the scan signal SCAN. In addition, the pixel PX includes a sensing TFT (SS-TFT) for sinking current by the driving TFT (DR-TFT) in response to the sensing signal (SENSE).

At this time, it is preferable that the electrical characteristics of the driving TFT (DR-TFT), such as electron mobility and threshold voltage, are designed identically in all pixels PX, but in reality, each pixel PX is different due to process conditions and driving environments. Deviation occurs in the electrical characteristics of the driving TFT (DR-TFT). Accordingly, the driving current Ids according to the same data voltage Vdata is different for each pixel PX, and as a result, a luminance deviation occurs between the pixels PX.

In order to solve this problem, conventionally, a compensation technique for reducing luminance non-uniformity by measuring the threshold voltage of the driving TFT (DR-TFT) from each pixel (PX) and appropriately correcting the data voltage (Vdata) according to the measurement result has been used. .

2 is a timing diagram of a control signal for controlling a conventional sensing circuit (SC).

Referring to the conventional compensation technique with reference to FIGS. 1 and 2, when a high-level scan signal SCAN is applied to the pixel PX, the scan TFT (SC-TFT) is turned on, and the data line DL The data voltage Vdata is applied to the gate terminal of the driving TFT (DR-TFT) from the digital-to-analog converter (DAC).

In addition, the precharging signal SPRE is applied at a high level to turn on the precharging switch S1, whereby the sensing line SSL is pre-charged to a pre-charging voltage Vpre of a predetermined level. )do. Here, the precharging voltage Vpre may be a predetermined reference voltage level.

Next, the precharging switch S1 is turned off by applying the low level precharging signal SPRE, and the sensing TFT SS-TFT is turned on by applying the high level sensing signal SENSE. do.

Accordingly, the driving TFT (DR-TFT) is driven in the saturation region according to the voltage difference between the data voltage Vdata stored in the capacitor C1 and the precharging voltage Vpre, so that the sink current flows, and the sensing line SSL ) rises to the voltage Vpre' corresponding to the saturation region.

Thereafter, when the increased voltage Vpre' reaches the threshold voltage Vth of the driving TFT (DR-TFT), the sensing line SSL becomes saturated. At the time of saturation, the sensing signal (SENSE) is applied with a low level and the sampling signal (SAM) is applied with a high level, so that the sampling switch (S2) is turned on and the charged voltage (Vpre') is analog-digital By being sampled (Vsen) by the converter (ADC), the threshold voltage is sensed.

The threshold voltage sensed by the above method is stored in a separate memory, and the sensing result is reflected in the data voltage Vdata by a preset compensating means to be corrected, thereby completing the compensating drive.

However, according to the conventional compensation technology, after initializing the voltage of the source terminal of the driving TFT (DR-TFT) in the process of sensing the threshold voltage, and then applying a data voltage to the gate terminal of the driving TFT (DR-TFT), the driving TFT is turned on until the voltage of the source terminal becomes (data voltage - threshold voltage). However, if the screen is maintained in an on state during threshold voltage sensing, a screen unintended by the user may be displayed.

Accordingly, in the case of performing compensation driving using the conventional compensation technology, it is possible only when the display panel is turned off, so there is a problem in that the conventional compensation technology cannot be applied to a commercial display device that keeps the display panel in an on state at all times. .

In addition, as described above, the conventional compensation technology has a problem in that a relatively long time is required for a measurement process for performing compensation because compensation is performed based on the voltage of the capacitor C1, which takes time to charge.

An object of the present invention is to provide a picture quality compensation module and method of a display device that determines a compensation method for compensating for a change in electrical characteristics of a driving TFT based on a temperature of a display panel.

Another object of the present invention is to provide a picture quality compensation module and method of a display device for generating a final compensation parameter from a lookup table according to a compensation method using a sensing voltage.

Another object of the present invention is to provide a picture quality compensation module and method of a display device for calculating a final data voltage according to a compensation method using a final compensation parameter.

Another object of the present invention is to provide a picture quality compensation module and method of a display device for applying a corrected final data voltage to a driving TFT according to a compensation method determined based on a temperature of a display panel.

In order to achieve the above object, the present invention determines a compensation method for compensating for a change in electrical characteristics of a driving TFT based on the temperature of a display panel, generates a final compensation parameter according to the determined compensation method, and A picture quality compensation module and method for calculating a final data voltage to be applied, and a display device including the picture quality compensation module are provided.

More specifically, in the present invention, it is determined whether the temperature change value of the display panel exceeds a preset reference change value, and a compensation method is determined according to the determination result.

When the change value exceeds the reference change value, the correction method is determined as electron mobility correction, and conversely, when the change value is less than or equal to the reference change value, the correction method is determined as threshold voltage correction.

A correction value according to the change value is generated from a look-up table corresponding to the determined correction method among look-up tables in which the electron mobility change value according to the change value of the sensing voltage and the threshold voltage correction value are stored.

The correction value generated in the current correction parameter is generated as a final parameter according to the correction method, and the generated final parameter is applied to the current data voltage to correct the final data voltage.

Accordingly, the present invention can compensate for the image quality of the display to be uniform by determining a compensation method according to the temperature of the display and compensating for the data voltage without turning off the operating state of the display device.

According to the present invention as described above, by determining a compensation method for compensating for a change in electrical characteristics of the driving TFT based on the temperature of the display panel, there is an advantage in that the image quality of the display can be compensated effectively. For example, the image quality compensation module and method of the display device according to the present invention perform electron mobility compensation with a large temperature change when the temperature change of the display is large, and a threshold with a small temperature change when the temperature change is small. By performing voltage compensation, effective compensation can be performed according to the driving environment of the display.

In addition, according to the present invention, by generating a final compensation parameter from a look-up table according to a compensation method using a sensing voltage, there is an advantage in that image quality compensation of a display can be quickly performed. For example, the picture quality compensation module and method of the display device according to the present invention can shorten the compensation execution time by quickly updating the final compensation parameter from the lookup table without using a complex and time-consuming arithmetic formula.

In addition, according to the present invention, when measuring the sensing voltage of the driving TFT in generating the final compensation parameter, the sensing voltage is measured without switching the operating state of the display panel to an off state, thereby compensating the display quality even when the display panel is turned on. has the advantage of being able to do For example, a commercial display that needs to keep the operating state of the display panel always on can also compensate for the image quality of the display device in real time.

1 is an equivalent circuit diagram of a pixel and a sensing circuit of a conventional organic light emitting display device;
2 is a timing diagram of a control signal for controlling a conventional sensing circuit.
3 is a diagram showing the configuration of a picture quality compensation module according to an embodiment of the present invention.
4 is a diagram illustrating a connection configuration between a picture quality compensation module, a data driver, a gate driver, and pixels according to an embodiment of the present invention;
5 is a timing diagram of a control signal output from a picture quality compensation module according to an embodiment of the present invention.
6 is a diagram illustrating a display device according to another embodiment of the present invention.
7 is a diagram illustrating a pixel arrangement of a display device according to another embodiment of the present invention.
8 is a diagram showing a connection configuration of a display device according to another embodiment of the present invention.
9 is a flowchart illustrating a picture quality compensation method according to another embodiment of the present invention.

The above objects, features and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention belongs will be able to easily implement the technical spirit of the present invention. In describing the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

3 is a diagram illustrating a picture quality compensation module 100 according to an embodiment of the present invention. Referring to FIG. 3 , the picture quality compensation module 100 according to an embodiment of the present invention may include a determination unit 110 , a generation unit 120 and a calculation unit 130 . The picture quality compensation module 100 shown in FIG. 3 is according to an embodiment, and its components are not limited to the embodiment shown in FIG. 3, and some components may be added, changed, or deleted as necessary. there is.

4 is a diagram showing a connection structure between the picture quality compensation module 100, the data driver 10, the gate driver 20, the temperature measurement unit 30, and the pixel PX according to an embodiment of the present invention; 5 is a timing diagram of a control signal output from a picture quality compensation module according to an embodiment of the present invention.

Hereinafter, the picture quality compensation module 100 according to an embodiment of the present invention will be described with reference to FIGS. 3 to 5 .

The determination unit 110 receives the temperature of the display panel from the temperature measurement unit 30 and determines a compensation method for compensating for a change in electrical characteristics of the driving TFT (DR-TFT) based on the input temperature of the display panel. .

Here, the temperature of the display panel measured by the temperature measuring unit 30 is a physical value for determining a compensation method, and may be a temperature measured close to the pixel PX including the driving TFT (DR-TFT).

On the other hand, the change in the electrical characteristics of the driving TFT (DR-TFT) refers to the variation in electrical characteristics of the driving TFT (DR-TFT) for each pixel PX due to process conditions and driving environments. This means that the driving current Ids is different for each pixel PX, and as a result, a luminance deviation occurs between the pixels PX.

Therefore, in order to compensate for a change in the electrical characteristics of the driving TFT (DR-TFT), the deviation of the driving current (Ids) is reduced by compensating for the electronic mobility or threshold voltage, which is an electrical characteristic of the driving TFT (DR-TFT).

Referring to the effect of temperature-dependent electron mobility compensation and threshold voltage compensation, the threshold voltage variation of the driving TFT (DR-TFT) according to temperature is smaller than the electron mobility variation. That is, as the temperature change increases, the change in electron mobility also increases, whereas the change in threshold voltage is not significantly affected by the change in temperature.

Accordingly, when the temperature of the display panel varies greatly, electron mobility compensation is used, and when there is no significant change in the temperature of the display panel, threshold voltage compensation is used to compensate for the luminance deviation between the pixels PX. will do

The determination unit 110 calculates a temperature change value of the display panel and compares the temperature change value with a preset reference change value. In this case, the determination unit 110 may receive the temperature of the display panel from the temperature measurement unit 30 at each reference time and calculate the change value of the temperature in order to calculate the change value of the temperature of the display panel.

Thereafter, the determination unit 110 selects a compensation method for compensating for the change in electrical characteristics of the driving TFT (DR-TFT) based on the comparison result between the temperature change value and the preset reference change value, among electron mobility compensation and threshold voltage compensation. decide which one

More specifically, the determination unit 110 determines the compensation method as electron mobility compensation when the temperature change value is greater than or equal to the reference change value. Conversely, if the temperature change value is less than the reference change value, the determination unit 110 determines the compensation method as threshold voltage compensation.

For example, the reference change value may be preset to 0.5 degrees.

Through this, the image quality compensation module 100 may determine a compensation method using a change in electrical characteristics according to temperature.

The generation unit 120 generates a final compensation parameter according to the compensation method determined by the determination unit 110 using the sensing voltage Vsen of the driving TFT (DR-TFT).

Here, the sensing voltage Vsen is a voltage value obtained by measuring the voltage applied to the source terminal of the driving TFT (DR-TFT) and can be measured using the sensing circuit SC connected to the pixel PX.

To this end, the generator 120 may measure the sensing voltage Vsen by outputting the data control signal DDC and the gate control signal GDC to the data driver 10 and the gate driver 20, respectively.

Specifically, the generating unit 120 outputs the data control signal DDC including the precharging signal SPRE and the sampling signal SAM to the data driving unit 10 so that the control circuit included in the data driving unit 10 ( It is possible to control the precharging switch (S1) and sampling switch (S2) of the SC).

Also, the generator 120 outputs the gate control signal GDC to the gate driver 20 . Thereafter, the gate driver 20 scans with the scan TFT (SC-TFT) and the sensing TFT (SS-TFT) respectively connected to the gate terminal and the source terminal of the driving TFT (DR-TFT) in response to the gate control signal (GDC). Turn-on and turn-off may be controlled by outputting the signal SCAN and the sensing signal SENSE.

Referring to FIG. 5 , the generator 120 outputs the data control signal DDC and the gate control signal GDC to the data driver 10 and the gate driver 20, thereby generating the sensing signal SENSE and the precharging signal. (SPRE) is output at a high level to discharge the sensing line SSL to the precharging voltage Vpre.

Thereafter, the scan signal SCAN is output at a high level to apply the data voltage Vdata to the gate terminal of the driving TFT (DR-TFT). Accordingly, a difference voltage between the data voltage Vdata and the precharging voltage Vpre is stored in the capacitor C1.

Thereafter, when the supply of the data voltage Vdata is stopped by outputting the scan signal SCAN at a low level, the driving TFT (DR-TFT) is turned on by the difference voltage stored in the capacitor C1, and a current proportional thereto is generated. is applied to the organic light emitting diode (OLED).

When the precharging signal SPRE is applied at a low level after a predetermined period of time, as the precharging voltage Vpre of the sensing line SSL is charged through the driving TFT (DR-TFT) and the sensing TFT (SS-TFT), The voltage of the sensing line SSL rises.

The sensing TFT (SS-TFT) is turned off, and the sampling switch (S2) is turned on to sample the varied voltage of the sensing line (SSL) through an analog-to-digital converter (ADC) to generate unit 120. The sensing voltage Vsen is output.

The generation unit 120 generates a compensation value using the change value of the sensing voltage Vsen according to the compensation method determined by the determination unit 110 . Here, the change value of the sensing voltage Vsen may be a voltage difference between the precharging voltage Vpre and the sensing voltage Vsen for a preset time period.

The generation unit 120 may generate a compensation value by using a look-up table in which a correlation with respect to the compensation value according to the change value of the sensing voltage Vsen is stored.

More specifically, compensation values of electron mobility and threshold voltage according to the change value of the sensing voltage Vsen are previously stored in the lookup table, and the generation unit 120 generates the sensing voltage from the lookup table corresponding to the determined compensation method ( A compensation value corresponding to the change value of Vsen) may be generated.

For example, when the change value of the temperature of the display panel is measured to be greater than or equal to the preset reference change value and the change value of the sensing voltage Vsen is “2V”, the compensation method from the determination unit 110 is electron mobility compensation. It is decided.

Accordingly, the generation unit 120 searches for “2V” from the lookup table in which the compensation value of the electron mobility according to the change value of the sensing voltage Vsen is stored, and generates an electron mobility compensation value corresponding thereto. there is.

That is, the generation unit 120 may generate a compensation value corresponding to a change value of the sensing voltage Vsen from a lookup table corresponding to a compensation method.

Here, as shown in FIG. 5, the change value of the sensing voltage Vsen is the sensing line ( It may be a value obtained by dividing the capacitance of SSL). Accordingly, the change value of the sensing voltage Vsen may be proportional to the amount of current Ids.

The generating unit 120 generates final compensation parameters by applying the generated correction values to the current compensation parameters. Here, the current compensation parameter may be a compensation parameter at the time of generating the final compensation parameter.

When generating a new correction value, the generation unit 120 may add the correction value to the current compensation parameter corresponding to the type of the generated correction value among the current compensation parameters to generate the final compensation parameter.

In this case, the correction value may be a negative value or a positive value, and accordingly, the value of the final compensation parameter may be generated as a value smaller than that of the current compensation parameter.

For example, when generating an electron mobility compensation value from an electron mobility lookup table according to the determination of the compensation method by the determination unit 110, the generation unit 120 reads the current compensation parameter from the memory.

Through this, the generation unit 120 does not use the operation formula of the drive TFT (DR-TFT), which takes a long operation time and has a large operation load.

Thereafter, the generation unit 120 may generate a final compensation parameter for the electron mobility by adding the generated compensation value for the electron mobility to the current compensation parameter for the electron mobility among the current compensation parameters. At this time, the current compensation parameter of the threshold voltage for which no compensation value is generated is generated as a final compensation parameter as the current value.

The generation unit 120 may generate a final compensation parameter for electron mobility using Equation 1 below.

<Equation 1>

Here, αN+1 may be a final compensation parameter for electron mobility, αN may be a current compensation parameter for electron mobility, and Δα may be a compensation value for electron mobility.

Also, the generation unit 120 may generate a final compensation parameter for the threshold voltage using Equation 2 below.

<Equation 2>

Here, ΦN+1 may be a final compensation parameter for the threshold voltage, ΦN may be a current compensation parameter for the threshold voltage, and ΔΦ may be a compensation value for the threshold voltage.

The calculator 130 calculates the final data voltage applied to the driving TFT (DR-TFT) using the final compensation parameter.

More specifically, the calculation unit 130 calculates the final data voltage by adding or multiplying the current data voltage by the final compensation parameter generated according to the compensation method determined by the determination unit 110 .

If the determined compensation method is electron mobility compensation, the calculator 130 calculates the final data voltage by multiplying the current data voltage by the final compensation parameter. Conversely, if the determined compensation method is threshold voltage compensation, the calculator 130 may calculate the final data voltage by adding the final compensation parameter to the current data voltage.

Also, the calculation unit 130 controls the data driver 10 through the data line DL so that the calculated final data voltage is applied to the gate terminal of the driving TFT (DR-TFT).

6 is a diagram illustrating a display device 1000 according to another embodiment of the present invention.

A display device 1000 according to another embodiment of the present invention includes a display panel 1100, a temperature measuring unit 1200, a timing controller 1300, a data driver 1400, and a gate driver 1500, and a timing controller 1300 includes the picture quality compensation module 1310 according to an embodiment of the present invention described above.

7 is a diagram showing a pixel arrangement of a display device 1000 according to another embodiment of the present invention, and FIG. 8 is a diagram showing a connection configuration of the display device 1000 according to another embodiment of the present invention.

Hereinafter, a display device 1000 according to another embodiment of the present invention will be described with reference to FIGS. 6 to 8 .

The display panel 1100 includes a plurality of data lines (DL_1 to DL_m; m is a positive integer), a plurality of sensing lines (SSL_1 to SSL_m), a plurality of scan gate lines (SGL1_1 to SGL1_n; n is a positive integer), and a plurality of The sensing gate lines SGL2_1 to SGL2_n of are crossed.

Pixels PX are arranged in a matrix form in each intersection area, and each pixel P receives a high potential driving voltage EVDD and a low potential driving voltage EVSS from a power generator (not shown).

Each pixel PX is connected to a plurality of data lines DL_1 to DL_m, a plurality of sensing lines SSL_1 to SSL_m, a plurality of scan gate lines SGL1_1 to SGL1_n, and a plurality of sensing gate lines SGL2_1 to SGL2_n. do.

The pixel PX may include an organic light emitting diode (OLED), a driving TFT (DR-TFT), a scanning TFT (SC-TFT), a sensing TFT (SS-TFT), and a capacitor C1.

An organic light emitting diode (OLED) includes an anode electrode, a cathode electrode connected to an input terminal of a low potential driving voltage (EVSS), and an organic compound layer positioned between the anode electrode and the cathode electrode.

The TFTs constituting the pixel PX may be implemented as p-type or n-type. In addition, semiconductor layers of TFTs constituting the pixel PX may include amorphous silicon, polysilicon, and oxide.

The driving TFT (DR-TFT) controls the current (Ids) flowing through the organic light emitting diode (OLED) according to the voltage (Vgs) between the gate and source terminals. The driving TFT (DT-TFT) includes a gate terminal connected to the first node N1, a drain terminal connected to an input terminal of the high potential driving voltage EVDD, and a source terminal connected to the second node N2.

The capacitor C1 is connected between the first node N1 and the second node N2 and stores the voltage Vgs between the gate and source terminals of the driving TFTs (DT-TFT).

The temperature measuring unit 1200 is installed on the display panel 1100 or a support member supporting the display panel 1100 to measure the temperature of the display panel 1100 or ambient temperature.

The temperature measurement unit 1200 may include a plurality of temperature sensors that partition the display panel 1100 at regular intervals and are installed at regular intervals on the rear surface of the partitioned display panel 1100 .

Here, the temperature measurement unit 1200 may include a plurality of temperature sensors in the form of chips or a plurality of resistance temperature sensors made of resistors in the form of thin films arranged at regular intervals in the front non-display area of the display panel 1100. there is.

At this time, the plurality of resistance temperature sensors are formed in the form of thin films so that resistance characteristics change according to temperature, and measure the temperature of the display panel 1100 through resistance change according to the temperature of the display panel 1100 .

As another example, the temperature measurement unit 1200 may include a plurality of temperature sensors disposed so that the number increases or the interval decreases from the rear edge of the display panel 1100 toward the central portion where heat dissipation is relatively weak.

The timing controller 1300 determines the operation timing of the data driver 1400 based on timing signals such as the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the dot clock signal DCLK, and the data enable signal DE. A data control signal DDC for controlling and a gate control signal GDC for controlling the operation timing of the gate driver 1500 are generated.

Meanwhile, the picture quality compensation module 1310 included in the timing controller 1300 determines a compensation method for compensating for a change in electrical characteristics of the driving TFT (DR-TFT) based on the temperature of the display panel 1100, and determines the compensation. A final compensation parameter according to the method is generated to calculate the final data voltage applied to the driving TFT.

To this end, the image quality compensation module 1310 may include a determining unit 1311, a generating unit 1312, and a calculating unit 1313.

The determining unit 1311, the generating unit 1312, and the calculating unit 1313 of the picture quality compensation module 1310 according to another embodiment of the present invention are the components of the picture quality compensation module 100 according to the above-described embodiment of the present invention. Since the configuration and role of the determining unit 110, the generating unit 120, and the calculating unit 130 are the same, repeated descriptions will be omitted.

The data driver 1400 includes a digital-to-analog converter (DAC) and an analog-to-digital converter (ADC), and further includes a sensing circuit (SC) including a precharging switch (S1) and a sampling switch (S2).

The data driver 1400 converts the input digital data MDATA into a data voltage Vdata based on the data control signal DDC from the picture quality compensation module 100 included in the timing controller 1300 and converts the data line ( It is input to the pixel PX through DL_1 to DL_m).

To this end, the DAC may generate the data voltage Vdata under the control of the picture quality compensation module 100 and output it to the data lines DL_1 to DL_m.

In addition, the data driver 1400 samples the voltages applied to the sensing lines SSL_1 to SSL_m into digital values using an analog-to-digital converter (ADC), and transmits the sensing voltage to the picture quality compensation module 100 of the timing controller 1300. Output as (Vsen).

To this end, a sensing capacitor Cx for storing the source voltage of the second node N2 as the sensing voltage Vsen may be connected to the data lines DL_1 to DL_m.

The gate driver 1500 generates control signals for controlling the precharging switch S1 and the sampling switch S2 based on the gate control signal GDC from the timing controller 1300 .

In this case, the gate driver 1500 may be directly formed on the display panel 1100 according to a gate-driver in panel (GIP) method.

The picture quality compensation module 1310 may compensate the data voltage Vdata for each horizontal or vertical line in the display panel 1100 .

For example, the picture quality compensation module 1310 may compensate the data voltage Vdata applied to the pixels PX located on the same horizontal line of the display panel 1100 in order from left to right.

Also, the picture quality compensation module 1310 may compensate for the data voltage Vdata of one horizontal line and then select another horizontal line at random to compensate the data voltage Vdata.

9 is a flowchart illustrating a picture quality compensation method according to another embodiment of the present invention.

Referring to FIG. 9 , in the picture quality compensating method according to another embodiment of the present invention, the temperature of the display panel is input (S10). In this case, the temperature of the display panel may be a temperature measured for each zone by zoning the display panel.

Next, a compensation method for compensating for a change in electrical characteristics of the driving TFT is determined based on the input temperature of the display panel (S20). More specifically, step S20 calculates the measured temperature change value and compares the calculated temperature change value with a preset reference change value.

As a result of the comparison, if the temperature change value is greater than or equal to the reference change value, the compensation method is determined as electron mobility compensation, and conversely, if the temperature change value is less than the reference change value, the compensation method is determined as threshold voltage compensation.

Subsequently, the sensing voltage of the driving TFT is input (S30). At this time, the sensing voltage of the driving TFT is measured using a sensing mode capable of measuring the sensing voltage of the driving TFT even when the screen of the display panel is turned on.

Next, final compensation parameters are generated according to the compensation method determined in step S20 using the input sensing voltage (S40).

To this end, in step S40, the change value of the sensing voltage is calculated using the sensing voltage, and the change value of the sensing voltage calculated from the look-up table of the electron mobility or the look-up table of the threshold voltage is calculated according to the determined compensation method, thereby correcting will create a value.

Thereafter, the current correction parameters are read from the memory and the generated correction values are applied to generate the final correction parameters. For example, a final parameter may be generated by adding a correction value to a current correction parameter.

Next, the final data voltage applied to the driving TFT is calculated using the final compensation parameter (S50). At this time, in step S50, the final data voltage is calculated according to the final compensation parameter generated according to the compensation method determined in step S20.

More specifically, if the determined compensation method is electron mobility compensation, the final data voltage is calculated by multiplying the current data voltage by the final compensation parameter, and if the determined compensation method is threshold voltage compensation, the final data voltage is obtained by adding the final compensation parameter to the current data voltage. will yield

Finally, the final data voltage calculated by controlling the data driver is applied to the gate terminal of the driving TFT (S60).

Meanwhile, the picture quality compensation method according to another embodiment of the present invention has been described as performing step S30 of receiving the sensing voltage of the driving TFT after step S10 of receiving the temperature of the display panel receiving the temperature, but according to another embodiment Note that, according to the picture quality compensation method, the above-described steps S10 and S30 may be performed simultaneously.

Since the above-described present invention is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention to those skilled in the art in the technical field to which the present invention belongs, the above-described embodiments and accompanying drawings is not limited by

Claims (17)

a determination unit that receives the temperature of the display panel and determines a compensation method for compensating for a change in electrical characteristics of the driving TFT based on the temperature of the display panel;
a generator configured to generate a final compensation parameter according to the determined compensation method using the sensing voltage of the driving TFT; and
a calculator configured to calculate a final data voltage applied to the driving TFT using the final compensation parameter;
The determination unit determines the compensation method as electron mobility compensation when the temperature change value of the display panel is greater than or equal to a preset reference change value, and determines the compensation method as threshold voltage compensation when the temperature change value is less than the reference change value. Image quality compensation module determined by
According to claim 1,
The decision section
An image quality compensation module that compares the change value of the temperature with the reference change value, and determines the compensation method as one of the electron mobility compensation and the threshold voltage compensation based on the comparison result.
delete According to claim 1,
the generator
An image quality compensation module generating a correction value according to the determined compensation method using the sensing voltage and generating a final compensation parameter by applying the correction value to a current compensation parameter.
According to claim 1,
The calculation unit
If the determined compensation method is electron mobility compensation, the final data voltage is calculated by multiplying a current data voltage by the final compensation parameter, and if the determined compensation method is threshold voltage compensation, the final compensation parameter is added to the current data voltage to obtain the final compensation parameter. An image quality compensation module that calculates a final data voltage and controls a data driver to apply the calculated final data voltage to the driving TFT.
receiving the temperature of the display panel;
determining a compensation method for compensating for a change in electrical characteristics of a driving TFT based on the temperature of the display panel;
receiving a sensing voltage of the driving TFT;
generating a final compensation parameter according to the determined compensation method using the sensing voltage;
calculating a final data voltage applied to the driving TFT using the final compensation parameter; and
applying the final data voltage to the driving TFT;
The step of determining the compensation method,
determining the compensation method as electron mobility compensation when the temperature change value is equal to or greater than a predetermined reference change value; and
and determining the compensation method as threshold voltage compensation when the change value of the temperature is less than the reference change value.
According to claim 6,
The step of determining the compensation method,
Calculating a change value of the input temperature;
comparing the change value of the temperature with the reference change value; and
Determining the compensation method as one of the electron mobility compensation and the threshold voltage compensation based on the comparison result.
Image quality compensation method including.
delete According to claim 6,
The steps to generate the final compensation parameters are
generating a correction value according to the determined compensation method using the sensing voltage; and
Generating a final compensation parameter by applying the correction value to the current compensation parameter.
Image quality compensation method including.
According to claim 6,
The step of calculating the final data voltage is
calculating the final data voltage by multiplying a current data voltage by the final compensation parameter if the determined compensation method is electron mobility compensation; and
If the determined compensation method is threshold voltage compensation, calculating the final data voltage by adding the final compensation parameter to the current data voltage.
Image quality compensation method including.
According to claim 6,
The step of applying the final data voltage to the driving TFT
controlling a data driver so that the calculated final data voltage is applied to the driving TFT;
Image quality compensation method including.
a temperature measuring unit that measures the temperature of the display panel;
Image quality compensation that determines a compensation method for compensating for a change in electrical characteristics of the driving TFT based on the temperature of the display panel, generates a final compensation parameter according to the determined compensation method, and calculates a final data voltage applied to the driving TFT. module; and
a data driver for applying the calculated final data voltage to the driving TFT;
The image quality compensation module determines the compensation method as electron mobility compensation when the temperature change value of the display panel is greater than or equal to a preset reference change value, and performs the compensation method when the temperature change value is less than the reference change value. A display device determined by threshold voltage compensation.
According to claim 12,
The temperature measuring unit
A display device configured to zone the display panel and measure the temperature of each zone.
According to claim 12,
The quality compensation module
A determination unit for comparing the change value of the temperature with the reference change value, and determining the compensation method as one of the electron mobility compensation and the threshold voltage compensation based on the comparison result.
A display device comprising:
delete According to claim 12,
The quality compensation module
A generator for generating a correction value according to the determined compensation method using the sensing voltage of the driving TFT and generating a final compensation parameter by applying the correction value to a current compensation parameter.
A display device further comprising:
According to claim 12,
The quality compensation module
If the determined compensation method is electron mobility compensation, the final data voltage is calculated by multiplying a current data voltage by the final compensation parameter, and if the determined compensation method is threshold voltage compensation, the final compensation parameter is added to the current data voltage to obtain the final compensation parameter. A calculator configured to calculate a final data voltage and control the data driver to apply the calculated final data voltage to the driving TFT.
A display device further comprising:

Images