KR102445108B1 - Display device and electronic device having the same - Google Patents

Abstract

A display device includes a display panel including a plurality of pixels, a scan driver for supplying scan signals to the pixels, a data driver including a plurality of analog-to-digital converters for converting an analog signal supplied from the pixels into a digital signal, and a digital signal. and a timing controller that selects reference channels based on the uniformity and controls an ADC deviation calculating unit that calculates gains and offsets of the reference channels, a scan driver, a data driver, and an ADS deviation calculator.

Description

Display device and electronic device including same {DISPLAY DEVICE AND ELECTRONIC DEVICE HAVING THE SAME}

The present invention relates to a display device and an electronic device including the same.

Recently, various flat panel display devices capable of reducing weight and volume, which are disadvantages of a cathode ray tube, have been developed. The flat panel display includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic light emitting display (OLED). etc. In particular, the organic light emitting diode display is in the spotlight as a promising next-generation display device because it has various advantages such as a wide viewing angle, a fast response speed, a thin thickness, and low power consumption.

The organic light emitting diode display may include a data driver, and each data driver may include an analog-to-digital converter (ADC). The analog-to-digital converter may convert an analog signal supplied from the display panel into a digital signal. In order to reduce errors caused by the deviation of the analog-to-digital converter, the gain and offset of the analog-to-digital converter may be set before the display device is shipped.

SUMMARY OF THE INVENTION One object of the present invention is to provide a display device that calculates and stores the gain and offset of an analog-to-digital converter (ADC) before shipment.

Another object of the present invention is to provide an electronic device including a display device that calculates and stores the gain and offset of an analog-to-digital converter (ADC) before shipment.

However, the object of the present invention is not limited to the above purpose, and may be variously expanded without departing from the spirit and scope of the present invention.

In order to achieve one aspect of the present invention, a display device according to an embodiment of the present invention provides a display panel including a plurality of pixels, a scan driver supplying a scan signal to the pixels, and an analog signal supplied from the pixels. A data driver including a plurality of analog-to-digital converters for converting ? into a digital signal, an ADC deviation calculator for selecting reference channels based on the uniformity of the digital signal, and calculating the gain and the offset of the reference channels, and the scan driver , a timing controller that generates a control signal for controlling the data driver and the ADC deviation calculator.

In an embodiment, the data driver may receive the analog signal through data lines or sensing lines connected to the pixels.

In an embodiment, the data driver includes an input unit receiving the analog signals for each channel corresponding to a plurality of sensing lines, and the analog signals provided to each channel of the input unit and supplied to the sensing lines. It may include the analog-to-digital converter for converting the digital signal.

According to an embodiment, the data driver may further include a multiplexer provided in each channel of the input unit to sequentially supply the analog signals to the analog-to-digital converter.

According to an embodiment, the ADC deviation calculating unit may include a channel selector for selecting the reference channels and a modeling unit for calculating the gain and the offset of each of the analog-to-digital converters connected to the reference channels.

In an exemplary embodiment, the channel selector may remove an impulse component of the digital signals and obtain the uniformity of the digital signal in the channel based on an average value of the digital data in the channel.

According to an embodiment, the channel selector may select the channel having the high uniformity as the reference channel.

In an exemplary embodiment, the modeling unit may supply a test voltage to the pixel and calculate the gain and the offset of the analog-to-digital converter based on the digital signal output from the analog-to-digital converter.

According to an embodiment, the ADC deviation calculator may be connected to the timing controller or included in the timing controller.

According to an embodiment, the ADC deviation calculator may be connected to the data driver or included in the data driver.

In order to achieve another object of the present invention, an electronic device according to embodiments of the present invention may include a display device and a processor for controlling the display device. The display device includes a display panel including a plurality of pixels, a scan driver supplying scan signals to the pixels, and a data driver including a plurality of analog-to-digital converters for converting analog signals supplied from the pixels into digital signals; Selecting reference channels based on the uniformity of the digital signal, and generating a control signal for controlling the ADC deviation calculator for calculating the gain and the offset of the reference channels, and the scan driver, the data driver, and the ADC deviation calculator It may include a timing controller.

In an embodiment, the data driver may receive the analog signal through data lines or sensing lines connected to the pixels.

In an embodiment, the data driver includes an input unit receiving the analog signals for each channel corresponding to a plurality of sensing lines, and the analog signals provided to each channel of the input unit and supplied to the sensing lines. It may include the analog-to-digital converter for converting the digital signal.

According to an embodiment, the data driver may further include a multiplexer provided in each channel of the input unit to sequentially supply the analog signals to the analog-to-digital converter.

According to an embodiment, the ADC deviation calculating unit may include a channel selector for selecting the reference channels and a modeling unit for calculating the gain and the offset of each of the analog-to-digital converters connected to the reference channels.

In an exemplary embodiment, the channel selector may remove an impulse component of the digital signals and obtain the uniformity of the digital signal in the channel based on an average value of the digital data in the channel.

According to an embodiment, the channel selector may select the channel having the high uniformity as the reference channel.

In an exemplary embodiment, the modeling unit may supply a test voltage to the pixel and calculate the gain and the offset of the analog-to-digital converter based on the digital signal output from the analog-to-digital converter.

According to an embodiment, the ADC deviation calculator may be connected to the timing controller or included in the timing controller.

According to an embodiment, the ADC deviation calculator may be connected to the data driver or included in the data driver.

A display device and an electronic device including the same according to embodiments of the present invention select a reference channel based on the uniformity of digital signals output from an analog-to-digital converter included in a data driver before shipment of the display device, and select the reference channels and the reference channels. By modeling the gain and offset of the analog-to-digital converter to be connected, the gain and offset of the analog-to-digital converter can be calculated. Accordingly, the deviation correction accuracy of the analog-to-digital converter can be improved. However, the effects of the present invention are not limited to the above-described effects, and may be variously expanded without departing from the spirit and scope of the present invention.

1 is a block diagram illustrating a display device according to example embodiments.
2A and 2B are circuit diagrams illustrating an example of a pixel included in the display device of FIG. 1 .
3A and 3B are diagrams illustrating an example of a data driver included in the display device of FIG. 1 .
3C is a graph for explaining the data driver of FIGS. 3A and 3B .
4 is a block diagram illustrating an ADC deviation calculating unit included in the display device of FIG. 1 .
5 is a flowchart illustrating an operation of a channel selector included in the ADC deviation calculating unit of FIG. 4 .
6 is a graph for explaining an operation of a modeling unit included in the ADC deviation calculating unit of FIG. 4 .
FIG. 7 is a diagram for explaining an operation of a modeling unit included in the ADC deviation calculating unit of FIG. 4 .
8 is a block diagram illustrating an electronic device according to embodiments of the present invention.
9 is a diagram illustrating an example in which the electronic device of FIG. 8 is implemented as a smartphone.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and repeated descriptions of the same components are omitted.

1 is a block diagram illustrating a display device according to embodiments of the present disclosure, FIG. 2A is a circuit diagram illustrating an example of a pixel included in the display device of FIG. 1 , and FIG. 2B is a diagram included in the display device of FIG. 1 . It is a circuit diagram showing another example of a pixel.

Referring to FIG. 1 , the display device 100 may include a display panel 110 , a scan driver 120 , a data driver 130 , an ADC deviation calculator 140 , and a timing controller 150 .

A plurality of scan lines and a plurality of data lines may be formed in the display panel 110 , and a plurality of pixels may be formed in a region where the scan lines and the data lines intersect.

Referring to FIG. 2A , each of the pixels may include an organic light emitting diode EL, a switching transistor T1 , a storage capacitor C, a driving transistor TD, and a sensing transistor TS. In this case, in the driving transistor TD, the switching transistor T1 may be turned on in response to the scan signal SCAN (SCAN) supplied from the scan line SL. When the switching transistor T1 is turned on, the data signals DATA and DATA supplied from the data line DL may be stored in the storage capacitor C. Referring to FIG. The driving transistor TD may generate a driving current to be supplied to the organic light emitting diode EL based on the data signals DATA and DATA. The organic light emitting diode EL may emit light according to a driving current. The sensing transistor TS is turned on in response to the sensing signal A_SENSE SENSE to connect the anode electrode of the organic light emitting diode EL and the sensing line SENL. When the sensing transistor TS is turned on, the current flowing through the organic light emitting diode EL may be supplied to the data driver 130 through the sensing line SENL.

Referring to FIG. 2B , each of the pixels may include an organic light emitting diode EL, a switching transistor T1 , a storage capacitor C, a driving transistor TD, and a sensing transistor TS. The pixel of FIG. 2B has the same configuration as the pixel of FIG. 2A except that the sensing transistor TS is formed on the anode electrode and the data line DL of the organic light emitting diode EL. do. A sensing transistor TS may be formed between the anode electrode of the organic light emitting diode EL of the pixel of FIG. 2B and the data line DL. The sensing transistor TS is turned on in response to the sensing signal A_SENSE SENSE to connect the anode electrode of the organic light emitting diode EL and the data line DL. When the sensing transistor TS is turned on, the current flowing through the organic light emitting diode EL may be supplied to the data driver 130 through the data line DL. In this case, the time point at which the data signal DATA is supplied through the data line and the time point at which the current flowing through the organic light emitting diode is sensed through the data line may be different.

The scan driver 120 may supply scan signals SCAN to pixels through scan lines formed on the display panel 110 of the display device 100 .

The data driver 130 may include a data output unit and a sensing unit.

The data output unit of the data driver 130 may receive the image signals R, G, and B or the corrected image signals R', G', and B' from the timing controller 150 . The data output unit may supply the data signal DATA corresponding to the image signals R, G, and B or the corrected image signals R', G', and B' to the display panel 110 . The sensing unit of the data driver 130 may sense a current flowing through the organic light emitting diode through a sensing line or a data line connected to a pixel. The sensing unit of the data driver 130 may include an input unit and an analog-to-digital converter. The input unit may receive analog signals for each channel corresponding to the sensing lines or data lines, that is, the sensing signals A_SENSE. In this case, the channel may correspond to a plurality of sensing lines or a plurality of data lines. For example, one channel may correspond to four sensing lines. An analog-to-digital converter (ADC) may be provided in each channel of the input unit. The sensing signals A_SENSE supplied through the input unit may be converted into a digital signal D_SENSE through an analog-to-digital converter included in the data driver 130 . Each of the digital signals D_SENSE may have an ADC code corresponding to the analog signal. The sensing unit of the data driver 130 may further include a multiplexer provided in each channel of the input unit to sequentially supply the sensing signals A_SENSE to the analog-to-digital converter. The digital signal D_SENSE output from the sensing unit of the data driver 130 may be supplied to the timing control unit 150 to compensate for the image signals R, G, and B.

The data driver 130 includes a plurality of analog-to-digital converters, and a deviation between analog-to-digital converters may occur according to a gain (G) and an offset (O) of each of the analog-to-digital converters. In this case, the digital signal D_SENSE of the neighboring analog-to-digital converters may be referred to as an offset between channels. To improve this, the ADC deviation calculating unit 140 may set initial values of the gain (G) and offset (O) of the analog-to-digital converter before shipment of the product, that is, the display device 100 .

In FIG. 1 , the ADC deviation calculating unit 140 is illustrated as being connected to the data driving unit 130 , but the present invention is not limited thereto. For example, the ADC deviation calculator 140 may be included in the data driver 130 . Also, the ADC deviation calculator 140 may be connected to the timing controller 150 or included in the timing controller 150 . Meanwhile, the ADC deviation calculator 140 may be an external device connected to the data driver 130 to set initial values of the gain (G) and offset (O) of the analog-to-digital converter before shipment of the product.

The ADC deviation calculator 140 may select reference channels based on the uniformity of the digital signal D_SENSE output from the analog-to-digital converter, and calculate the gain G and the offset O of the reference channels. The ADC deviation calculating unit 140 may include a channel selection unit and a modeling unit. The channel selector may select a reference channel. The channel selector may calculate the uniformity of the digital signals D_SENSE output from the analog-to-digital converter connected to the channel, and sequentially select channels with high uniformity as reference channels. For example, the channel selector may select 20 channels having high uniformity among 200 channels as the reference channels. A detailed operation of the channel selector will be described later with reference to FIG. 5 . The modeling unit may model a gain (G) and an offset (O) of each of the analog-to-digital converters connected to the reference channels. The modeling unit may supply a test voltage to pixels of the display panel 110 and calculate a gain G and an offset O of the analog-to-digital converter based on the digital signal D_SENSE output from the analog-to-digital converter. The ADC code output from the analog-to-digital converter may be controlled by changing the test voltage supplied to the display panel 110 . The modeling unit may calculate an offset between channels in each ADC code. The modeling unit may model the gain (G) and the offset (O) of the analog-to-digital converter based on the offset between channels calculated in the preset ADC code. The modeling unit may model a gain (G) and an offset (O) of analog-to-digital converters connected to reference channels, and store an average value of the gain (G) and offset (O) in a memory. In this case, the memory may be included in the timing controller 150 . A detailed operation of the modeling unit will be described later with reference to FIGS. 6 and 7 .

The timing controller 150 may generate a control signal for controlling the scan driver 120 , the data driver 130 , and the ADC deviation calculator 140 . The timing controller 150 receives the image signals R, G, and B through an external device, and the sensing signal A_SENSE supplied from the data driver 130 and the gain (G) and offset of the analog-to-digital converter stored in the memory. A correction signal may be output to the data driver 130 based on (O).

As described above, in the display device 100 of FIG. 1 , before shipment of the display device 100 , in the ADC deviation calculator 140 , the gain G of the analog-to-digital converter included in the data driver 130 of the display device 100 . ) and offset (O) can be calculated and stored. The ADC deviation calculator 140 selects channels having high uniformity of digital signals D_SENSE output from the analog-to-digital converter as a reference channel, and calculates the gain (G) and offset (O) of the analog-to-digital converter connected to the reference channels. can be modeled. Accordingly, it is possible to increase the deviation correction accuracy of the analog-to-digital converter.

3A and 3B are diagrams illustrating an example of a data driver included in the display device of FIG. 1 , and FIG. 3C is a graph illustrating the data driver of FIGS. 3A and 3B .

Referring to FIG. 3A , the data driver 130 may include an input unit 132 and an analog-to-digital converter. The data driver 130 may be implemented with a plurality of data drive integrated circuits (ICs). Each of the data drive integrated circuits receives the analog signals A_S0, A_S1, A_S2, ...) supplied from the display panel 110 through the input unit 132 and receives the analog signals A_S0, A_S1, A_S2, ... through the analog-to-digital converters 134, 136, 138. Analog signals (A_S0, A_S1, A_S2, ...) may be converted into digital signals (D_S0, D_S1, D_S2, ...).

The input unit 132 may be connected to sensing lines of the display panel 110 to receive sensing signals A_S0, A_S1, A_S2, ... through the sensing lines. For example, the input unit 132 may receive sensing signals A_S0, A_S1, A_S2, ... through an integrator that senses a current flowing through the organic light emitting diode. The input unit 132 may receive sensing signals (A_S0, A_S1, A_S2, ...), ie, analog signals, for each channel corresponding to the plurality of sensing lines. For example, as shown in FIG. 3A , one channel may correspond to four sensing lines.

The analog-to-digital converters 134 , 136 , and 138 are provided in each channel of the input unit 132 and convert the sensing signals A_S0, A_S1, A_S2, ...) supplied to the sensing lines to the digital signals D_S0, D_S1, D_S2. , ...) can be converted to For example, when the data drive integrated circuit is connected to 200 sensing lines and one channel corresponds to 4 sensing lines, the data drive integrated circuit includes 50 analog-to-digital converters ( 134, 136, 138). The digital signals (D_S0, D_S1, D_S2, ...) output from the analog-to-digital converters 134 , 136 , 138 may be supplied to the ADC deviation calculator.

As shown in FIG. 3B , the data driver 130 may further include multiplexers 132 , 133 , and 134 . The multiplexers 132, 133, and 134 are provided in each channel of the input unit 132 to sequentially supply the analog signals A_S0, A_S1, A_S2, ... to the analog-to-digital converters 135, 136, 137. . For example, when one channel corresponds to four sensing lines, the data driver 130 may include a 4x1 multiplexer.

Again, referring to FIG. 3A , a difference may occur in the digital signals D_S0, D_S1, D_S2, ... output for each channel according to the gains and offsets of the analog-to-digital converters 134 , 136 , and 138 . For example, when a test voltage outputting a constant gray level is supplied to the display panel 110 and a current flowing through the organic light emitting diode is sensed through a sensing line, characteristic deviation of the organic light emitting diode and the analog-to-digital converters 134 and 136 , 138), a deviation of the digital signals D_S0, D_S1, D_S2, ... may occur. However, since the characteristic deviation of the organic light emitting diode before shipment of the product is minute, in the embodiment of the present invention, the content of reducing the deviation of the analog-to-digital converters 134 , 136 , and 138 will be described. When a test voltage outputting a constant gray level is supplied to the display panel 110 and a current flowing through the organic light emitting diode is sensed through a sensing line, digital signals output from the same analog-to-digital converters 134, 136, and 138 ( D_S0, D_S1, D_S2, ...) may have similar ADC codes. However, the digital signals D_S0, D_S1, D_S2, ...) output from different analog-to-digital converters may have different ADC codes according to gain and offset deviations of the analog-to-digital converters 134 , 136 , and 138 . In the data driver 130 shown in FIG. 3A , the digital signals D_S0, D_S1, D_S2, and D_S3 output from the 0th analog-to-digital converter 134 connected to the 0th channel CH0 have similar ADC codes. and digital signals D_S4, D_S5, D_S6, and D_S7 output from the first analog-to-digital converter 136 connected to the first channel CH1 are digital signals output from the 0th analog-to-digital converter 134 ( D_S0, D_S1, D_S2, D_S3) and may have a different value. Referring to FIG. 3C , the digital signals D_S0, D_S1, D_S2, and D_S3 output from the 0th analog-to-digital converter 134 connected to the 0th channel CH0 have ADC codes in the range of 500ㅁ5, The digital signals D_S4, D_S5, D_S6, and D_S7 output from the first analog-to-digital converter 136 connected to the first channel CH1 may have an ADC code in the range of 550w5. At this time, the difference between the last digital data (ie, D_S3) of the 0th analog-to-digital converter 134 and the first digital data (ie, D_S4) of the first analog-to-digital converter 136 is calculated using the first analog-to-digital converter 136 . It can be defined as the inter-channel offset (ΔCH) of That is, the inter-channel offset ΔCH may be a difference between ADC codes corresponding to neighboring digital signals in adjacent analog-to-digital converters.

4 is a block diagram illustrating an ADC deviation calculating unit included in the display device of FIG. 1 .

Referring to FIG. 4 , the ADC deviation calculating unit 140 may include a channel selection unit 142 and a modeling unit 144 .

The channel selector 142 may select the reference channels CH(n) based on the uniformity of the digital signals D_S0, ..., D_Sm. The channel selector 142 receives the digital signals D_S0, ..., D_Sm output from the analog-to-digital converter connected to the channel, and calculates the uniformity of the digital signals D_S0, ..., D_Sm for each channel. can do. The channel selector 142 may set the reference channels CH(n) in an order of increasing uniformity. Information on the reference channels CH(n) set by the channel selector 142 may be supplied to the modeling unit 144 .

The modeling unit 144 may calculate a gain and an offset of each of the analog-to-digital converters connected to the reference channels CH(n). The modeling unit 144 receives the digital signals D_S0, ..., D_Sm supplied from the analog converter connected to the reference channels CH(n), and models the gain and offset of the analog-to-digital converter based thereon. can do. The modeling unit may store an average value (G) of gains and an average value (O) of offsets of analog-to-digital converters connected to reference channels in a memory.

5 is a flowchart illustrating an operation of a channel selector included in the ADC deviation calculating unit of FIG. 4 .

Referring to FIG. 5 , the channel selector may remove an impulse component of digital signals output from the analog-to-digital converter (S100), calculate the uniformity of each channel (S120), and set a reference channel (S140).

The channel selector may remove an impulse component of digital signals output from the analog-to-digital converter ( S100 ). The channel selector may increase data accuracy by removing an impulse component due to noise from among digital signals output from the analog-to-digital converter. For example, the channel selector may set reference data, select a digital signal having a value greater than or less than the reference data as an impulse component, and remove the digital signal. The channel selector may calculate an average value of the remaining digital signals from which the impulse component is removed. For example, when one channel corresponds to four sensing lines, the channel selector receives four digital signals from the analog-to-digital converter, and converts one digital signal having a value greater than or equal to the reference data to an impulse signal. , and it is possible to calculate the average value of the remaining three digital signals except for the impulse signal.

The channel selector may calculate the uniformity of each channel ( S120 ). The channel selector may calculate the uniformity of the channel using [Equation 1].

[Equation 1]

UNIFORMITY[CH(n)] = Avg(n) + [MAX(n)-MIN(n)]

At this time, UNIFORMITY[CH(n)] represents the uniformity of the n-th channel, Avg(n) represents the average value of the remaining digital signals except for the impulse component in the n-th channel, and MAX(n) represents the impulse in the n-th channel. It represents the largest value (ie, the maximum value) among the remaining digital signals excluding the component, and MIN(n) represents the smallest value (ie, the minimum value) among the remaining digital signals except for the impulse component in the n-th channel. The channel selector may calculate the uniformity for each channel using [Equation 1].

The channel selector may set a reference channel based on the uniformity of the channel ( S140 ). The channel selector may set channels having high uniformity as reference channels. For example, the channel selector may set the reference channel by using the RANK function. For example, the channel selector may select 5 channels with high uniformity among 50 channels as reference channels.

FIG. 6 is a graph for explaining the operation of the modeling unit included in the ADC deviation calculating unit of FIG. 4 , and FIG. 7 is a diagram for explaining the operation of the modeling unit included in the ADC deviation calculating unit of FIG. 4 .

The modeling unit may calculate a gain and an offset of each of the analog-to-digital converters connected to the reference channels.

When a test voltage is applied to the display panel, a corresponding driving current may flow through the organic light emitting diode. The input unit of the data driver may receive an analog signal corresponding to the driving current, and the analog-to-digital converter may convert the analog signal into a digital signal. Each digital signal may have an ADC code corresponding to the analog signal. That is, if the test voltage supplied to the display panel is changed, the ADC code output from the analog-to-digital converter may be changed. The gain and offset of the analog-to-digital converter may be modeled based on the channel-to-channel offset (ΔCH) output from the preset ADC code.

Referring to FIG. 6 , it can be seen that the offset (ΔCH) between the ADC code and the channel in each channel has a tendency. In this case, the inter-channel offset ΔCH may be calculated as the difference between the digital signals corresponding to the neighboring digital signals in the adjacent analog-to-digital converters as described with reference to FIG. 3A . The offset (ΔCH) between the digital signal and the channel may be modeled as a linear equation having a slope and an intercept as in [Equation 2].

[Equation 2]

CHANNEL OFFSET(n) = GAIN(n) x ADC Code(n, j) + OFFSET(n)

At this time, CHANNEL OFFSET(n) represents the offset between channels of the analog-to-digital converter connected to the nth channel, GAIN(n) represents the gain of the analog-to-digital converter connected to the nth channel, and ADC Code(n, j) ) represents the ADC code of the j-th digital signal of the n-th channel, and OFFSET(n) represents the offset of the analog-to-digital converter connected to the n-th channel. The offset of the analog-to-digital converter connected to the n-th channel is a value of an output digital signal when a test voltage outputting black is applied to the display panel. That is, the slope of the linear equation may be the gain of the analog-to-digital converter, and the Y-intercept may be the offset.

7, the modeling unit calculates the offset (ΔCH) between channels corresponding to the five ADC codes (ADC1, ADC2, ADC3, ADC4, ADC5), and the five ADC codes (ADC1, ADC2, ADC3, ADC4, ADC5) and the offset between channels (ΔCH) can be modeled as a linear equation with slope and intercept. In this case, the five ADC codes ADC1, ADC2, ADC3, ADC4, and ADC5 may be digital signals corresponding to a 0V test voltage, a low-level test voltage, a middle-level test voltage, and a high-level test voltage. Since the digital signal corresponding to the low-level test voltage may be damped, two low-level test voltages having different levels may be applied to the display panel to obtain more accurate data. Although the method of modeling the gain and offset of the analog-to-digital converter by applying five test voltages has been described in FIG. 7 , the number of test voltages is not limited thereto. For example, the modeling unit may model the gain and offset of the analog-to-digital converter based on ADC codes corresponding to 10 test voltages and an offset between channels (ΔCH). However, as the number of test voltages increases, the capacity of the memory for storing the digital signal may increase, and the operation speed may decrease.

The modeling unit may calculate a gain and an offset of analog-to-digital converters connected to the reference channels set by the channel selector. The modeling unit may store the calculated average value of the gain and the offset in the memory. In this case, the memory may be included in the timing controller.

As described above, the ADC deviation calculating unit selects channels with high uniformity of digital signals output from the analog-to-digital converter as a reference channel, and models the gain and offset of the analog-to-digital converter connected to the reference channels by modeling the analog-to-digital converter's Deviation correction accuracy can be improved.

8 is a block diagram illustrating an electronic device according to embodiments of the present invention, and FIG. 9 is a diagram illustrating an example in which the electronic device of FIG. 8 is implemented as a smartphone.

8 and 9 , the electronic device 200 includes a processor 210 , a memory device 220 , a storage device 230 , an input/output device 240 , a power supply 250 , and a display device 260 . may include In this case, the display device 260 may correspond to the display device 200 of FIG. 1 . Furthermore, the electronic device 200 may further include various ports capable of communicating with a video card, a sound card, a memory card, a USB device, and the like, or communicating with other systems. Meanwhile, as shown in FIG. 9 , the electronic device 200 may be implemented as a smartphone 300 , but the electronic device 200 is not limited thereto.

The processor 210 may perform certain calculations or tasks. In one embodiment, the processor 210 may be a microprocessor, a central processing unit (CPU), or the like. The processor 210 may be connected to other components through an address bus, a control bus, and a data bus. The processor 210 may also be connected to an expansion bus, such as a Peripheral Component Interconnect (PCI) bus. The memory device 220 may store data necessary for the operation of the electronic device 200 . For example, the memory device 220 may include EPROM, EEPROM, flash memory, phase change random access memory (PRAM), resistance random access memory (RRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), and the like. and/or a volatile memory device such as a dynamic random access memory (DRAM), a static random access memory (SRAM), or a mobile DRAM. The storage device 230 may include a solid state drive (SSD), a hard disk drive (HDD), a CD-ROM, and the like.

The input/output device 240 may include an input means such as a keyboard, a keypad, a touch pad, a touch screen, a mouse, and the like, and an output means such as a speaker, a printer, and the like. The display device 260 may be provided in the input/output device 240 . The power supply 250 may supply power required for the operation of the electronic device 200 . The display device 260 may be connected to other components through the buses or other communication links. As described above, the display device 260 may include a display panel, a scan driver, a data driver, an ADC deviation calculator, and a timing controller. A plurality of scan lines and a plurality of data lines may be formed in the display panel, and a plurality of pixels may be formed in a region where the scan lines and the data lines cross each other. The scan driver may supply scan signals to the pixels through scan lines formed on the display panel of the display device. The data driver may sense a current flowing through the organic light emitting diode through a sensing line or a data line connected to the pixel. The data driver may include an input unit and an analog-to-digital converter. The input unit may receive analog signals, ie, sensing signals, for each channel corresponding to the sensing lines or data lines. In this case, the channel may correspond to a plurality of sensing lines or data lines. An analog-to-digital converter (ADC) may be provided in each channel of the input unit. The sensing signals supplied through the input unit may be converted into digital signals through an analog-to-digital converter included in the data driver. The data driver may further include a multiplexer provided in each channel of the input unit to sequentially supply sensing signals to the analog-to-digital converter. The data driver may include a plurality of analog-to-digital converters. In this case, a deviation between the analog-to-digital converters may occur according to a gain and an offset of each of the analog-to-digital converters. To improve this, the ADC deviation calculator can set the initial values of the gain and offset of the analog-to-digital converter before shipment of the product, that is, the display device. The ADC deviation calculator may select the reference channels based on the uniformity of the digital signal output from the analog-to-digital converter, and may calculate the gain and offset of the reference channels. The ADC deviation calculating unit may include a channel selection unit and a modeling unit. The channel selector may calculate the uniformity of digital signals output from the analog-to-digital converter connected to the channel, and select the reference channels in the order of the higher uniformity. The modeling unit may supply a test voltage to pixels of the display panel and calculate a gain and an offset of the analog-to-digital converter based on a digital signal output from the analog-to-digital converter. The modeling unit may model gains and offsets of analog-to-digital converters connected to reference channels, and store an average value of the gains and offsets in a memory. The timing controller may generate a control signal for controlling the scan driver, the data driver, and the ADC deviation calculator. The timing controller may receive an image signal through an external device and may output a correction signal to the data driver based on a sensing signal supplied from the data driver and a gain and an offset of the analog-to-digital converter stored in the memory.

As described above, the electronic device of FIG. 8 may include a display device that calculates and stores the gain and offset of the analog-to-digital converter included in the data driver before shipment. In this case, the display device selects channels with high uniformity of digital signals output from the analog-to-digital converter as a reference channel, and models the gain and offset of the analog-to-digital converter connected to the reference channels, thereby correcting the deviation correction accuracy of the analog-to-digital converter. can increase

The present invention can be applied to any electronic device having a display device. For example, the present invention can be applied to a television, a computer monitor, a notebook computer, a digital camera, a mobile phone, a smart phone, a smart pad, a tablet PC, a PDA, a PMP, an MP3 player, a navigation system, a video phone, and the like.

Although the above has been described with reference to exemplary embodiments of the present invention, those of ordinary skill in the art may vary the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. It will be understood that modifications and changes can be made to

100: display device 110: display panel
120: scan driver 130: data driver
140: ADC deviation calculation unit 150: timing control unit

Claims (20)

a display panel including a plurality of pixels;
a scan driver supplying a scan signal to the pixels;
a data driver including a plurality of analog-to-digital converters for converting analog signals supplied from the pixels into digital signals;
an ADC deviation calculating unit that selects reference channels based on the uniformity of the digital signal and calculates a gain and an offset of the reference channels; and
a timing controller for generating a control signal for controlling the scan driver, the data driver, and the ADC deviation calculator;
The ADC deviation calculator
a channel selector for selecting the reference channels; and
a modeling unit for calculating the gain and the offset of each of the analog-to-digital converters connected to the reference channels;
The channel selector removes an impulse component of the digital signals, and obtains the uniformity of the digital signal in the channel based on an average value of digital data in the channel,
and the channel selector selects, as the reference channel, a channel having the uniformity equal to or greater than a predetermined value. The display device of claim 1 , wherein the data driver receives the analog signal through data lines or sensing lines connected to the pixels. The method of claim 1, wherein the data driver
an input unit receiving the analog signals for each channel corresponding to a plurality of sensing lines; and
and the analog-to-digital converter provided in each channel of the input unit to convert the analog signals supplied to the sensing lines into the digital signals. 4. The method of claim 3, wherein the data driver
and a multiplexer provided in each channel of the input unit to sequentially supply the analog signals to the analog-to-digital converter. delete delete delete The display device of claim 1 , wherein the modeling unit supplies a test voltage to the pixel and calculates the gain and the offset of the analog-to-digital converter based on the digital signal output from the analog-to-digital converter. . The display device of claim 1 , wherein the ADC deviation calculator is connected to the timing controller or is included in the timing controller. The display device of claim 1 , wherein the ADC deviation calculator is connected to the data driver or is included in the data driver. An electronic device comprising a display device and a processor for controlling the display device, wherein the display device comprises:
a display panel including a plurality of pixels;
a scan driver supplying a scan signal to the pixels;
a data driver including a plurality of analog-to-digital converters for converting analog signals supplied from the pixels into digital signals;
an ADC deviation calculating unit that selects reference channels based on the uniformity of the digital signal and calculates a gain and an offset of the reference channels; and
a timing controller for generating a control signal for controlling the scan driver, the data driver, and the ADC deviation calculator;
The ADC deviation calculator
a channel selector for selecting the reference channels; and
a modeling unit for calculating the gain and the offset of each of the analog-to-digital converters connected to the reference channels;
The channel selector removes an impulse component of the digital signals, and obtains the uniformity of the digital signal in the channel based on an average value of digital data in the channel,
and the channel selector selects, as the reference channel, a channel having the uniformity equal to or greater than a preset value. The electronic device of claim 11 , wherein the data driver receives the analog signal through data lines or sensing lines connected to the pixels. 12. The method of claim 11, wherein the data driver
an input unit receiving the analog signals for each channel corresponding to a plurality of sensing lines; and
and the analog-to-digital converter provided in each channel of the input unit to convert the analog signals supplied to the sensing lines into the digital signals. 14. The method of claim 13, wherein the data driver
and a multiplexer provided in each channel of the input unit to sequentially supply the analog signals to the analog-to-digital converter. delete delete delete The electronic device of claim 11 , wherein the modeling unit supplies a test voltage to the pixel and calculates the gain and the offset of the analog-to-digital converter based on the digital signal output from the analog-to-digital converter. . The electronic device of claim 11 , wherein the ADC deviation calculator is connected to the timing controller or is included in the timing controller. The electronic device of claim 11 , wherein the ADC deviation calculator is connected to the data driver or is included in the data driver.

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