KR20170081776A - Display device and electronic device having the same - Google Patents

Abstract

The display device includes a display panel including a plurality of pixels, a scan driver for supplying a scan signal 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 timing controller for controlling the scan driver, the data driver, and the ADS deviation calculator. The ADC controller calculates the gain and offset of the reference channels based on the uniformity.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a display device,

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

2. Description of the Related Art Recently, various flat panel display devices capable of reducing weight and volume, which are disadvantages of cathode ray tubes (CRTs), have been developed. As a flat panel display device, a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an organic light emitting display (OLED) . In particular, organic light emitting display devices are attracting attention as promising next generation display devices because they have various advantages such as wide viewing angle, fast response speed, thin thickness and low power consumption.

The organic light emitting display includes a data driver, and each data driver may include an analog-to-digital converter (ADC). The analog-to-digital converter can convert the analog signal supplied from the display panel into a digital signal. The gain and offset of the analog-to-digital converter can be set prior to shipment of the display device to reduce the error caused by the deviation of the analog-to-digital converter.

It is an object of the present invention to provide a display device for calculating and storing gain and offset of a pre-shipment analog-to-digital converter (ADC).

It is another object of the present invention to provide an electronic device including a display device for calculating and storing gain and offset of a pre-shipment analog-to-digital converter (ADC).

However, the object of the present invention is not limited to the above-described objects, and various modifications may be made without departing from the spirit and scope of the present invention.

According to an aspect of the present invention, there is provided a display device including a display panel including a plurality of pixels, a scan driver for supplying a scan signal to the pixels, An ADC deviation arithmetic unit operable to select reference channels based on the uniformity of the digital signal and to calculate the gain and the offset of the reference channels; And a timing controller for generating a control signal for controlling the data driver and the ADC deviation calculator.

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

According to an embodiment, the data driver includes an input unit for receiving the analog signals for each channel corresponding to a plurality of sensing lines, and a controller for controlling the analog signals supplied to the sensing lines, And converting the digital signal into a digital signal.

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

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

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

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

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

According to an embodiment, the ADC deviation calculation unit may be connected to the timing control unit or included in the timing control unit.

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

According to another aspect of the present invention, there is provided an electronic apparatus including 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 for supplying a scan signal 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, An ADC deviation calculation unit for selecting reference channels based on the uniformity of the digital signal, calculating the gain and the offset of the reference channels, and a control signal for controlling the scan driver, the data driver, and the ADC deviation calculator And a timing control unit.

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

According to an embodiment, the data driver includes an input unit for receiving the analog signals for each channel corresponding to a plurality of sensing lines, and a controller for controlling the analog signals supplied to the sensing lines, And converting the digital signal into a digital signal.

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

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

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

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

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

According to an embodiment, the ADC deviation calculation unit may be connected to the timing control unit or included in the timing control unit.

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

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

1 is a block diagram showing a display device according to embodiments of the present invention.
2A and 2B are circuit diagrams showing an example of a pixel included in the display device of FIG.
3A and 3B are views showing an example of a data driver included in the display device of FIG.
3C is a graph for explaining the data driver of FIGS. 3A and 3B.
4 is a block diagram showing an ADC deviation calculation unit included in the display device of FIG.
5 is a flowchart illustrating an operation of the channel selection unit included in the ADC deviation calculation unit of FIG.
6 is a graph illustrating the operation of the modeling unit included in the ADC deviation calculation unit of FIG.
7 is a diagram for explaining the operation of the modeling unit included in the ADC deviation calculation unit of FIG.
8 is a block diagram showing an electronic apparatus according to embodiments of the present invention.
9 is a diagram showing 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 detail with reference to the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

FIG. 2A is a circuit diagram showing an example of a pixel included in the display device of FIG. 1, and FIG. 2B is a circuit diagram of a display device according to an embodiment of the present invention And is a circuit diagram showing another example of the pixel.

1, the display apparatus 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 an area 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 Tl, a storage capacitor C, a driving transistor TD, and a sensing transistor TS. In this case, the driving transistor TD may be turned on in response to the scan signal SCAN (SCAN) supplied from the scan line SL. The data signal DATA (DATA) supplied from the data line DL can be stored in the storage capacitor C while the switching transistor Tl is turned on. The driving transistor TD can generate a driving current to be supplied to the organic light emitting diode EL based on the data signal DATA. The organic light emitting diode EL can emit light in accordance with the driving current. The sensing transistor TS may be turned on in response to the sensing signal A_SENSE (SENSE) to connect the sensing line SENL with the anode electrode of the organic light emitting diode EL. When the sensing transistor TS is turned on, a current flowing in the organic light emitting diode EL can 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 Tl, 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. The 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, a current flowing in the organic light emitting diode EL can be supplied to the data driver 130 through the data line DL. At this time, a point of time when the data signal DATA is supplied through the data line and a point of time when the current flowing through the data line is sensed may be different.

The scan driver 120 may supply scan signals SCAN to the 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 video signals R, G, and B or the corrected video signals R ', G', and B 'from the timing controller 150. The data output unit may supply the display panel 110 with a data signal DATA corresponding to the video signals R, G, and B or the corrected video signals R ', G', and B '. 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 the 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, i.e., sensing signals A_SENSE, for each channel corresponding to the sensing lines or the data lines. At this time, 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. Each channel of the input unit may be provided with an analog digital converter (ADC). The sensing signals A_SENSE supplied through the input unit may be converted into a digital signal D_SENSE through an analog digital converter included in the data driver 130. [ Each digital signal 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 and sequentially supplying 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 controller 150 to compensate the video signals R,

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

1, the ADC deviation calculator 140 is connected to the data driver 130, but the present invention is not limited thereto. For example, the ADC deviation calculator 140 may be included in the data driver 130. The ADC deviation calculator 140 may be connected to the timing controller 150 or may be included in the timing controller 150. [ The ADC deviation calculator 140 may be an external device connected to the data driver 130 to set initial values of gain (G) and offset (O) of the analog digital converter before shipping the product.

The ADC deviation calculator 140 can select the 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 offset (O) of the reference channels. The ADC deviation calculator 140 may include a channel selector and a modeling unit. The channel selection unit can select a reference channel. The channel selection unit may calculate the uniformity of the digital signals D_SENSE output from the analog digital converter connected to the channel, and may sequentially select the channels having high uniformity as the reference channels. For example, the channel selection unit may select 20 channels having high uniformity among 200 channels as reference channels. The specific operation of the channel selection unit will be described later with reference to FIG. The modeling unit may model the gain (G) and the offset (O) of each of the analog digital converters connected to the reference channels. The modeling unit supplies the test voltage to the pixels of the display panel 110 and can calculate the gain G and the offset O of the analog digital converter based on the digital signal D_SENSE output from the analog digital converter. The ADC code output from the analog-to-digital converter can be controlled by changing the test voltage supplied to the display panel 110. The modeling unit can calculate the channel-to-channel offset in each ADC code. The modeling unit may model the gain (G) and offset (O) of the analog-to-digital converter based on the inter-channel offset computed in the predefined ADC code. The modeling unit may model gains (G) and offsets (O) of the analog-to-digital converters connected to the reference channels and store the average of the gains (G) and the offsets (O) in a memory. At this time, the memory may be included in the timing controller 150. The specific operation of the modeling unit will be described later with reference to FIG. 6 and FIG.

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 receives the sensing signal A_SENSE supplied from the data driver 130 and the gain G of the analog- And outputs the correction signal to the data driver 130 based on the correction signal O.

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

3A and 3B are views showing an example of a data driver included in the display device of FIG. 1, and FIG. 3C is a graph illustrating a 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 as a plurality of data drive ICs. Each of the data drive ICs 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, The analog signals A_S0, A_S1, A_S2, ... can be converted into digital signals D_S0, D_S1, D_S2, ....

The input unit 132 may be connected to the sensing lines of the display panel 110 to receive the sensing signals A_S0, A_S1, A_S2, ... through the sensing lines. For example, the input unit 132 may receive the 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 the sensing signals A_S0, A_S1, A_S2,..., Analog signals for respective channels 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 receive the sensing signals A_S0, A_S1, A_S2, ... supplied to the respective sensing lines in the respective channels of the input unit 132 with digital signals D_S0, D_S1, D_S2 , ...). For example, if the data drive integrated circuit is connected to 200 sensing lines and one channel corresponds to 4 sensing lines, the data drive integrated circuit may include 50 analog digital converters 134, 136, 138). The digital signals D_S0, D_S1, D_S2, ... output from the analogue digital converters 134, 136 and 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 respective channels of the input unit 132 to sequentially supply the analog signals A_S0, A_S1, A_S2, ... to the analog-digital converters 135, 136 and 137 . For example, if one channel corresponds to four sensing lines, the data driver 130 may include a 4x1 multiplexer.

Referring back to FIG. 3A, a difference may occur in the digital signals D_S0, D_S1, D_S2,..., Output on a channel-by-channel basis according to the gains and offsets of the analog-to-digital converters 134, For example, when a test voltage for 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 the sensing line, the characteristic deviation of the organic light emitting diode and the analog digital converters 134 and 136 , 138 may cause a deviation of the digital signals D_S0, D_S1, D_S2, .... However, since the characteristic deviation of the organic light emitting diode before shipment of the product is fine, the contents of reducing the deviation of the analog-digital converters 134, 136, and 138 will be described in the embodiment of the present invention. When a test voltage for outputting a constant gradation is supplied to the display panel 110 and a current flowing through the organic light emitting diode is sensed through the sensing line, digital signals (analog signals) D_S0, D_S1, D_S2, ...) may have similar ADC codes. However, the digital signals D_S0, D_S1, D_S2, ... output from different analogue digital converters may have different ADC codes depending on the gain and offset deviation of the analogue digital converters 134, 136, 3A, the digital signals D_S0, D_S1, D_S2, and D_S3 output from the zeroth analogue digital converter 134 connected to the 0th channel CH0 are converted into analog ADC codes Digital signals D_S4, D_S5, D_S6, and D_S7 output from the first analog digital converter 136 connected to the first channel CH1 are converted into digital signals D_S4, D_S5, D_S6, and D_S7 output from the 0th analog digital converter 134 D_S0, D_S1, D_S2, D_S3). Referring to FIG. 3C, the digital signals D_S0, D_S1, D_S2, and D_S3 output from the zeroth analog digital converter 134 connected to the 0th channel CHO have ADC codes in the range of 500 to 5, The digital signals D_S4, D_S5, D_S6, and D_S7 output from the first analog digital converter 136 connected to the first channel CH1 may have ADC codes in the range of 550.5. At this time, the difference between the last digital data (i.e., D_S3) of the zero analog digital converter 134 and the first digital data (i.e., D_S4) of the first analog digital converter 136 is stored in the first analog digital converter 136, Channel offset (DELTA CH). That is, the interchannel offset (DELTA CH) may be the difference of ADC codes corresponding to neighboring digital signals in adjacent analogue digital converters.

4 is a block diagram showing an ADC deviation calculation unit included in the display device of FIG.

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

The channel selection unit 142 can select the reference channels CH (n) based on the uniformity of the digital signals D_S0, ..., D_Sm. The channel selection unit 142 receives the digital signals D_S0, ..., D_Sm output from the analog 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 selection unit 142 can set the reference channels CH (n) in the order of higher uniformity. Information on the reference channels CH (n) set by the channel selecting unit 142 may be supplied to the modeling unit 144. [

The modeling unit 144 may calculate the gain and 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 an analog converter connected to the reference channels CH (n), and based on this, calculates a gain and an offset of the analog- can do. The modeling unit may store in the memory an average value (G) of the gain of the analog-to-digital converters connected to the reference channels and an average value (O) of the offset.

5 is a flowchart illustrating an operation of the channel selection unit included in the ADC deviation calculation unit of FIG.

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

The channel selection unit may remove the impulse component of the digital signals output from the analog digital converter (S100). The channel selection unit can increase the accuracy of data by removing impulse components due to noise from digital signals output from the analog digital converter. For example, the channel selection unit may set the reference data, and may select a digital signal having a value greater than or equal to the reference data as an impulse component, and remove the digital signal. The channel selection unit may calculate an average value of the remaining digital signals after removing the impulse component. For example, when one channel corresponds to four sensing lines, the channel selector receives four digital signals from the analog digital converter, and outputs one digital signal having a value equal to or greater than the reference data to an impulse signal , And the average value of the remaining three digital signals excluding the impulse signal can be calculated.

The channel selection unit 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)

In this case, UNIFORMITY [CH (n)] represents the uniformity of the n-th channel, Avg (n) represents the average value of the remaining digital signals excluding the impulse component in the n-th channel, MIN (n) represents the smallest value (i.e., the minimum value) of the remaining digital signals excluding the impulse component in the n-th channel. The channel selection unit can calculate the uniformity for each channel using Equation (1).

The channel selection unit may set the reference channel based on the uniformity of the channel (S140). The channel selection unit can set channels having high uniformity as reference channels. For example, the channel selection unit can set the reference channel using the RANK function. For example, the channel selector may select five channels having a high degree of uniformity among the fifty channels as the reference channel.

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

The modeling unit can calculate the gain and 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 can flow through the organic light emitting diode. The input section of the data driver receives an analog signal corresponding to the drive current, and the analog-to-digital converter can convert the analog signal into a digital signal. Each of the digital signals 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 can be changed. The gain and offset of the analog-to-digital converter can be modeled based on the interchannel offset (DELTA CH) output from the predefined ADC code.

Referring to FIG. 6, it can be seen that the ADC code and the channel offset (DELTA CH) tend to have a tendency in each channel. At this time, the interchannel offset (DELTA CH) can be calculated by a difference between digital signals corresponding to neighboring digital signals in adjacent analog digital converters as described with reference to FIG. 3A. The digital signal to channel offset (DELTA CH) can be modeled as a linear equation with slope and intercept as shown in Equation (2).

&Quot; (2) "

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

In this case, CHANNEL OFFSET (n) represents the channel-to-channel offset of the analog digital converter connected to the n-th channel, GAIN (n) represents the gain of the analog- ) 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 digital converter connected to the n-th channel is the value of the output digital signal that is applied to the test voltage that outputs black to the display panel. That is, the slope of the linear equation becomes the gain of the analog digital converter, and the Y intercept can be offset.

7, the modeling unit calculates an interchannel offset (DELTA CH) corresponding to five ADC codes (ADC1, ADC2, ADC3, ADC4, ADC5), and outputs the five ADC codes ADC1, ADC2, ADC3, ADC4, ADC5) and channel-to-channel offset (ΔCH) can be modeled as a linear equation with slope and intercept. At this time, the five ADC codes ADC1, ADC2, ADC3, ADC4, and ADC5 may be digital signals corresponding to a test voltage of 0V, a low level test voltage, a middle level test voltage, and a high level test voltage. A digital signal corresponding to a low level test voltage can be damped so that two low level test voltages having different levels can be applied to the display panel to obtain more accurate data. In FIG. 7, a method of modeling gain and offset of an analog digital converter by applying five test voltages has been described, but 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 the ADC code and the interchannel offset (DELTA CH) corresponding to the ten test voltages. 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 be slowed down.

The modeling unit may calculate a gain and an offset of the analog digital converters connected to the reference channels set in the channel selecting unit. The modeling unit can store the average value of the calculated gain and offset in the memory. At this time, the memory may be included in the timing control section.

As described above, the ADC deviation calculator selects channels having high uniformity of the digital signals output from the analog-to-digital converter as reference channels, and models gains and offsets of the analog-to-digital converters connected to the reference channels, The deviation correction accuracy can be increased.

FIG. 8 is a block diagram illustrating an electronic device according to an embodiment 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 . At this time, the display device 260 may correspond to the display device 200 of FIG. Further, the electronic device 200 may further include a plurality of ports capable of communicating with other systems, such as a video card, a sound card, a memory card, a USB device, and the like. Meanwhile, as shown in FIG. 9, the electronic device 200 may be implemented by the smartphone 300, but the electronic device 200 is not limited thereto.

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 coupled to other components via an address bus, a control bus, and a data bus. The processor 210 may also be coupled 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 be an EPROM, an EEPROM, a flash memory, a PRAM (Phase Change Random Access Memory), a RRAM (Resistance Random Access Memory), a MRAM (Magnetic Random Access Memory) Volatile memory devices and / or volatile memory devices such as dynamic random access memory (DRAM), static random access memory (SRAM), mobile DRAM, and the like. 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 input means such as a keyboard, a keypad, a touch pad, a touch screen, a mouse, etc., 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 can supply the power necessary for the operation of the electronic device 200. Display device 260 may be coupled to other components via 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 an area where the scan lines and the data lines intersect. The scan driver may supply the scan signals to the pixels through the 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, i.e., sensing signals, for each channel corresponding to the sensing lines or data lines. At this time, the channel may correspond to a plurality of sensing lines or data lines. Each channel of the input unit may be provided with an analog digital converter (ADC). The sensing signals supplied through the input unit may be converted into digital signals through the 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 and sequentially supplying 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 analog digital converters may occur according to the gain and offset of each of the analog digital converters. To improve this, the gain and offset initial value of the analog digital converter can be set before the output of the product, that is, the display device, in the ADC deviation calculation section. The ADC deviation calculator can select the reference channels based on the uniformity of the digital signal output from the analog-to-digital converter, and calculate the gain and offset of the reference channels. The ADC deviation calculation unit may include a channel selection unit and a modeling unit. The channel selection unit may calculate the uniformity of the digital signals output from the analog digital converter connected to the channel, and may select the reference channels in the order of higher uniformity. The modeling unit can supply the test voltage to the pixels of the display panel and calculate the gain and offset of the analog-to-digital converter based on the digital signal output from the analog-to-digital converter. The modeling unit may model the gains and offsets of the analog-to-digital converters connected to the reference channels, and store the average of the gains and the 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 receives the image signal through the external device, and can output a correction signal to the data driver based on the sensing signal supplied from the data driver and the gain and offset of the analog digital converter stored in the memory.

As described above, the electronic apparatus of FIG. 8 may include a display device for calculating and storing the gain and offset of the analog-to-digital converter included in the pre-shipment data driver. At this time, the display device selects channels having high uniformity of the digital signals output from the analog-to-digital converter as reference channels and models the gain and offset of the analog-to-digital converters connected to the reference channels, .

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

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be understood that the invention may be modified and varied without departing from the scope of the invention.

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

Claims (20)

A display panel including a plurality of pixels;
A scan driver for supplying a scan signal 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;
An ADC deviation operator for selecting reference channels based on the uniformity of the digital signal, and calculating the gain and the offset of the reference channels; And
And a timing controller for generating a control signal for controlling the scan driver, the data driver, and the ADC deviation calculator. 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 apparatus of claim 1, wherein the data driver
An input unit for receiving the analog signals for each channel corresponding to the plurality of sensing lines; And
And the analog-to-digital converter provided in each channel of the input unit and converting the analog signals supplied to the sensing lines into the digital signal. The display device according to claim 3, wherein the data driver
And a multiplexer provided in each channel of the input unit and sequentially supplying the analog signals to the analog digital converter. The apparatus of claim 1, wherein the ADC deviation calculation unit
A channel selector for selecting the reference channels; And
And a modeling unit for calculating the gain and the offset of each of the analog digital converters connected to the reference channels. 6. The display device according to claim 5, wherein the channel selector removes the impulse component of the digital signals and obtains the uniformity of the digital signal in the channel based on an average value of the digital data in the channel. 6. The display device of claim 5, wherein the channel selector selects the channel having the uniformity as the reference channel. The display device according to claim 5, wherein the modeling unit supplies a test voltage to the pixel and calculates the gain and the offset of the analog-digital converter based on the digital signal output from the analog-digital converter . The display device according to claim 1, wherein the ADC deviation calculation unit is connected to the timing control unit or included in the timing control unit. The display device according to claim 1, wherein the ADC deviation calculation unit is connected to the data driver or is included in the data driver. A display device and an electronic device including a processor for controlling the display device, wherein the display device
A display panel including a plurality of pixels;
A scan driver for supplying a scan signal 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;
An ADC deviation operator for selecting reference channels based on the uniformity of the digital signal, and calculating the gain and the offset of the reference channels; And
And a timing controller for generating a control signal for controlling the scan driver, the data driver, and the ADC deviation calculator. 12. The electronic apparatus according to claim 11, wherein the data driver receives the analog signals through data lines or sensing lines connected to the pixels. 12. The display device according to claim 11, wherein the data driver
An input unit for receiving the analog signals for each channel corresponding to the plurality of sensing lines; And
And an analog-to-digital converter provided in each channel of the input unit for converting the analog signals supplied to the sensing lines into the digital signal. 14. The method of claim 13, wherein the data driver
Further comprising: a multiplexer provided in each channel of the input unit for sequentially supplying the analog signals to the analog-to-digital converter. 12. The apparatus of claim 11, wherein the ADC deviation calculation unit
A channel selector for selecting the reference channels; And
And a modeling unit for calculating the gain and the offset of each of the analog digital converters connected to the reference channels. 16. The electronic apparatus according to claim 15, wherein the channel selector removes the impulse component of the digital signals and obtains the uniformity of the digital signal in the channel based on an average value of the digital data in the channel. 16. The electronic device according to claim 15, wherein the channel selecting unit selects the channel having the high uniformity as the reference channel. 16. The electronic device according to claim 15, wherein the modeling unit supplies a test voltage to the pixel and calculates the gain and the offset of the analog-digital converter based on the digital signal output from the analog-digital converter . 12. The electronic apparatus according to claim 11, wherein the ADC deviation calculation unit is connected to the timing control unit or included in the timing control unit. 12. The electronic apparatus according to claim 11, wherein the ADC deviation calculation unit is connected to the data driver or is included in the data driver.

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