KR20210083975A - Light emitting display device and method for sensing the same - Google Patents

Abstract

The present invention relates to a light emitting display device and a method for sensing the same to reduce resources required for pixel sensing and effectively reduce the increase in manufacturing costs due to the increase in resolution. The light emitting display device according to one embodiment includes: a panel including a plurality of horizontal channels and a plurality of column channels composed of a plurality of pixels; a gate driver dividing the horizontal channels into a full sensing horizontal channel and a fast sensing horizontal channel having different sensing times; a data driver including an analog-to-digital converter connected to a first column channel among the column channels, and a comparator connected to a second column channel; and a timing controller that controls the gate driver and the data driver in a sensing mode to obtain full sensing data for a first pixel among the pixels from the data driver, fast sensing data for a second pixel, and comparison data for each of a third pixel and a fourth pixel, wherein the timing controller generates the sensing data for each of the second pixel, the third pixel, and the fourth pixel by performing interpolation prediction processing using the full sensing data of the first pixels adjacent to the periphery.

Description

A light emitting display device and its sensing method {LIGHT EMITTING DISPLAY DEVICE AND METHOD FOR SENSING THE SAME}

The present invention relates to a light emitting display device capable of reducing resources required for pixel sensing and effectively reducing an increase in manufacturing cost due to an increase in resolution, and a method of driving the same.

As a display device, a light emitting display device using a self-luminous device such as a liquid crystal display (LCD) using a liquid crystal and an organic light emitting diode (OLED) is mainly used.

The light emitting display device uses a self-luminous device that emits light through the recombination of electrons and holes, and thus has high luminance, low driving voltage, and can be made into an ultra-thin film and can be realized in a free shape.

Each pixel constituting the light emitting display device includes a light emitting element and a pixel circuit independently driving the light emitting element. The pixel circuit controls the brightness of the light emitting device by controlling the current Ids at which a driving thin film transistor (hereinafter, TFT) drives the light emitting device according to the driving voltage Vgs corresponding to the data signal.

The light emitting display device includes a sensing circuit for compensating for deterioration of the driving TFT, and the mobility and the threshold voltage (hereinafter referred to as Vth) of the driving TFT are sensed and compensation is performed using the sensing circuit.

A light emitting display device requires a circuit and time for sensing all pixels, and a memory for storing sensing data equal to the pixel resolution. Accordingly, the light emitting display device has a problem in that the manufacturing cost increases because resources such as circuits, memory, and time required for sensing all pixels are significant and increase in proportion to the resolution of the panel.

The present invention relates to a light emitting display device capable of reducing resources required for pixel sensing and effectively reducing an increase in manufacturing cost due to an increase in resolution, and a method of driving the same.

According to an exemplary embodiment, a light emitting display device includes: a panel including a plurality of horizontal channels and a plurality of column channels configured with a plurality of pixels; a gate driver configured to divide and drive a plurality of horizontal channels into a full sensing horizontal channel having different sensing times and a fast sensing horizontal channel; a data driver including an analog-to-digital converter connected to a first column channel among the plurality of column channels and a comparator connected to a second column channel; and controlling the gate driver and the data driver in the sensing mode to compare the full sensing data for the first pixel, the fast sensing data for the second pixel, and the third pixel and the fourth pixel from the data driver. a timing controller for acquiring data, wherein the timing controller generates sensing data for each of the second pixel, the third pixel, and the fourth pixel by performing interpolation prediction processing using the full sensing data of the first pixels adjacent thereto .

According to an exemplary embodiment, a sensing method of a light emitting display device includes driving a plurality of horizontal channels composed of a plurality of pixels by dividing them into a full-sensing horizontal channel having different sensing times and a fast-sensing horizontal channel; Full sensing During the full sensing period in which the horizontal channel is driven, the full sensing data for the first pixel is output through an analog-to-digital converter connected to the first column channel among the plurality of column channels, and the comparator connected to the second column channel outputting comparison data for the third pixel through outputting fast sensing data for a second pixel through an analog-to-digital converter and outputting comparison data for a fourth pixel through a comparator during a fast sensing period in which the fast sensing horizontal channel is driven; obtaining full sensing data for the first pixel, fast sensing data for the second pixel, comparison data for the third pixel, and comparison data for the fourth pixel; and generating sensing data for each of the second pixel, the third pixel, and the fourth pixel by performing interpolation prediction processing using the full sensing data of the first pixels adjacent thereto.

The first pixel comprises pixels constituting the first column channel while constituting the full sensing scan channel, the second pixel comprises pixels constituting the first column channel constituting the fast scan channel, and the third pixel comprises the pixels constituting the first column channel. It includes pixels constituting a two-column channel.

The comparator receives a sensing voltage to which the characteristic is reflected from the third pixel or the fourth pixel, compares the sensing voltage with a lower limit value and an upper limit value, and outputs comparison data indicating a characteristic region of the third pixel or the fourth pixel. The comparison data may indicate a first region greater than the upper limit value, a second region between the upper limit value and the lower limit value, or a third region less than the lower limit value.

During the full sensing period, the comparator compares the sensing voltage with the first lower limit value and the first upper limit value, and during the fast sensing period, the sensing voltage can be compared with a second lower limit value different from the first lower limit value and a second upper limit value different from the first upper limit value. .

The timing controller may compare the fast sensing data with the upper limit value and the lower limit value, and may divide the fast sensing data into any one of the first to third regions.

When the comparison data or the fast sensing data corresponds to the second region, the timing controller uses the full sensing data of the adjacent first pixels and the deep learning method using the usage of each pixel according to the image accumulation to obtain the sensing data of the corresponding pixel. prediction can be generated.

When the comparison data or fast sensing data corresponds to the first region, the timing controller performs flag processing so that preset data is supplied to the corresponding pixel without generating sensing data and compensation data for the corresponding pixel, and the comparison data or fast sensing data is In the case of the third region, data of the corresponding pixel may be corrected using data of neighboring pixels without generating sensing data and compensation data for the corresponding pixel.

The gate driver may drive one of an even scan channel and an odd scan channel constituting the plurality of scan channels as a full sensing horizontal channel and drive the remaining scan channels as the fast horizontal channel.

The gate driver may drive a plurality of scan channels such that the full sensing horizontal channel and the fast horizontal channel alternate.

During one frame, the gate driver may sequentially drive a plurality of horizontal channels while alternating a full-sensing horizontal channel and a fast horizontal channel, or sequentially drive a plurality of full-sensing horizontal channels and then sequentially drive a plurality of fast horizontal channels. .

One of the odd column channels and the even column channels constituting the plurality of column channels may be connected to an analog-to-digital converter, and the other column channel may be connected to a comparator.

A light emitting display device and a sensing method thereof according to an embodiment perform fast sensing using full sensing data partially sampled from among a plurality of pixels through a combination of a full sensing channel and a fast sensing channel, an ADC output channel, and a comparator output channel. By predicting the sensing data for the pixels connected to the comparator output, the sensing time can be shortened, the complexity of the sensing circuit can be reduced, and the memory capacity for storing the sensing data can be reduced, thereby reducing the manufacturing cost.

Accordingly, it is possible to reduce the increase in resources (circuit, time, memory, etc.) required for sensing according to the increase in resolution and decrease the increase in manufacturing cost.

1 is a block diagram schematically illustrating a configuration of a light emitting display device according to an exemplary embodiment.
2 is an equivalent circuit diagram illustrating a partial configuration of each pixel and a data driver according to an exemplary embodiment.
3 is a driving waveform diagram of a full sensing horizontal channel and a fast horizontal channel of a gate driver according to an exemplary embodiment.
4 is a diagram illustrating a comparator configuration according to an embodiment.
5 is a graph illustrating a change relationship between a sensing time and a sensing voltage according to an exemplary embodiment.
6 is a distribution diagram of a sensing voltage according to an exemplary embodiment.
7 is a flowchart illustrating a sensing method of a light emitting display device according to an exemplary embodiment.
8 is a conceptual diagram illustrating a sensing method of a light emitting display device according to an exemplary embodiment.
9 is a driving waveform diagram of a gate driver according to an exemplary embodiment.
10 is a block diagram illustrating a sensing data generator according to an exemplary embodiment.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

1 is a block diagram illustrating a configuration of a light emitting display device according to an exemplary embodiment, FIG. 2 is an equivalent circuit diagram illustrating a partial configuration of each pixel and data driver according to an exemplary embodiment, and FIG. 3 is a gate according to an exemplary embodiment It is the driving waveform diagram of the driver.

1 and 2 , the light emitting display device includes a panel 100 , a gate driver 200 , a data driver 300 , a timing controller 400 , a gamma voltage generator 500 , and a memory 700 . can do. In FIG. 1 , the gate driver 200 and the data driver 300 may be represented as a panel driver driving the panel 100 . The gate driver 200 , the data driver 300 , the timing controller 400 , and the gamma voltage generator 500 may all be expressed as drivers.

The panel 100 displays an image through a pixel array. The pixel array may include red (R), green (G), and blue (B) pixels (P), and may further include white (W) pixels. Meanwhile, the panel 100 may be a panel having a built-in or attached touch sensor overlapping the pixel array.

Each pixel P includes a light emitting element and a pixel circuit independently driving the light emitting element. The pixel circuit includes a plurality of TFTs including at least a driving TFT for driving the light emitting element, a switching TFT for supplying a data signal to the driving TFT, and a driving voltage Vgs corresponding to the data signal supplied through the switching TFT. and a storage capacitor that supplies the driving TFT.

For example, each pixel P supplies a power line supplying a high potential driving voltage (first driving voltage; EVDD) and a low potential driving voltage (second driving voltage; EVSS) as shown in FIG. 2 . The light emitting device 10 connected between the common electrodes, and the first and second switching TFTs ST1 and ST2 and the driving TFT DT and the storage capacitor Cst to independently drive the light emitting device 10 . and a pixel circuit comprising at least one. Meanwhile, since the pixel circuit is various in addition to the configuration of FIG. 2 , various configurations may be applied.

In FIG. 2, for convenience of explanation, a panel 100 including four pixels P11, P12, P21, and P22 constituting two horizontal channels H1 and H2 and two column channels C1 and C2, and a panel A data driver 300 including a digital-to-analog converter (DAC), an analog-to-digital converter (ADC) and a comparator (COM) connected to two column channels C1 and C2 of the pixels of 100 is shown. .

The first switching TFT ST1 is driven by the gate signal supplied to the scan gate lines GLsc1 and GLsc2 from the gate driver 200 , that is, the scan pulse signals SC1 and SC2 , and the data line from the data driver 300 . The data voltage Vdata supplied to DL1 and DL2 is supplied to the gate node N1 of the driving TFT DT.

The second switching TFT ST2 is driven by a gate signal supplied to the sense gate lines GLse1 and GLse2 from the gate driver 200 , that is, the sense pulse signals SE1 and SE2 , and a reference line from the data driver 300 . A reference voltage supplied to (RL1, RL2) is supplied to the source node N2 of the driving TFT DT.

The storage capacitor Cst connected between the gate node N1 and the source node N2 of the driving TFT DT is connected to the gate node N1 and the source node N1 through the first and second switching TFTs ST1 and ST2. The difference voltage between the data voltage Vdata and the reference voltage Vref respectively supplied to N2 is charged to the driving voltage Vgs of the driving TFT DT, and the first and second switching TFTs ST1 and ST2 are turned off. The charged driving voltage Vgs is held during the light emission period.

The driving TFT DT controls the current supplied from the EVDD power line according to the driving voltage Vgs supplied from the storage capacitor Cst to supply the driving current determined by the driving voltage Vgs to the light emitting device 10 . The light emitting element 10 is made to emit light.

The light emitting element 10 includes an anode connected to the source node N2 of the driving TFT DT, a cathode connected to the EVSS supply line, and an organic light emitting layer between the anode and the cathode. The anode is independent for each pixel, but the cathode may be a common electrode shared by all pixels. In the light emitting device 10, when a driving current is supplied from the driving TFT (DT), electrons from the cathode are injected into the organic light emitting layer, and holes from the anode are injected into the organic light emitting layer. By emitting the phosphor material, light having a brightness proportional to the current value of the driving current is generated.

The timing controller 400 receives a source image and timing control signals from a host system. The host system may be any one of a system of a portable terminal such as a computer, a TV system, a set-top box, a tablet, or a mobile phone. The timing control signals may include a dot clock, a data enable signal, a vertical synchronization signal, a horizontal synchronization signal, and the like.

The timing controller 400 generates a plurality of data control signals for controlling the driving timing of the data driver 300 by using the supplied timing control signals and timing setting information stored therein, and supplies them to the data driver 300 , , a plurality of gate control signals for controlling driving timing of the gate driver 200 are generated and supplied to the gate driver 200 .

The timing controller 400 may perform various image processing for image quality correction, compensation for deterioration of a light emitting device, etc. on the source image data, and may reduce power consumption by analyzing image data to control image luminance.

The timing controller 400 converts the image-processed data (grayscale data) into voltage data, and then applies a compensation value for the characteristic deviation of each sub-pixel stored in the memory 700 to the voltage data to compensate, and the compensated data is supplied to the data driver 300 . The Vth of the driving TFT and the sensed value sensing the mobility characteristic, and the Vth compensation value and the mobility compensation value stored in the memory 500 are all voltage values. Accordingly, the timing controller 400 converts the grayscale data into voltage data using the LUT for each color, and then applies the compensation value of each subpixel to perform compensation processing.

The timing controller 400 generates sensing data used for a compensation value by controlling the light emitting display device to operate in a sensing mode. In the sensing mode, the timing controller 400 controls the gate driver 200 and the data driver 300 to drive the panel 100 in the sensing mode, and the pixel P of the panel 100 through the data driver 300 . The sensing data of the memory 700 may be updated by sensing the characteristic of , and using the sensing result.

In particular, in the sensing mode, the timing controller 400 controls the gate driver 200 and the data driver 300 to detect a plurality of horizontal channels with a full sensing channel having a long sensing time and a short sensing time. It is operated by dividing it into a fast sensing channel. In addition, the timing controller 400 performs sensing data (full sensing data, fast sensing data) from the data driver 300 through an analog-to-digital converter (ADC) channel for each sensing period of the full sensing period and the fast sensing period and a comparator. Comparison data is supplied through the (COM) channel.

The timing controller 400 uses the full sensed data supplied from the data driver 300 during the full sensing period for remaining pixels that are not fully sensed, that is, fast sensed pixels and pixels of a channel connected to the comparator COM. It is possible to predict the sensing data for At this time, the timing controller 400 detects the region to which the data belongs by using the fast sensing data from the fast sensed pixel through the ADC channel and the comparison data through the COM channel regardless of full sensing and fast sensing. can

The timing controller 400 performs a prediction process of sensing data for a corresponding pixel when the corresponding data is a region of a positive bias shift (PBTiS) characteristic, but the corresponding data is a region or a point defect (PD) of a negative bias shift (NBTiS) characteristic. ), an exception processing that does not generate compensation data is performed using the sensed data. A detailed description thereof will be provided later.

The gate driver 200 receives a plurality of gate control signals from the timing controller 400 and performs a shift operation to drive the scan gate lines GLsc1 and GLsc2 and the sense gate lines GLse1 and GLse2 of the panel 100 . do. The gate driver 200 supplies the gate-on voltage to the corresponding gate line during the driving period of each gate line (GLsc(i), GLse(i), and i is a positive integer), and during the non-driving period of each gate line, the gate An off voltage is applied to the corresponding gate line. The gate driver 200 may be formed together with the TFTs of the pixel array and embedded in the panel 100 in the form of a gate in panel (GIP).

The gate driver 200 may drive the scan gate line GLsc(i) and the sense gate line GLse(i) in units of each horizontal channel. The scan pulse signal SCi supplied to the scan gate line GLsc(i) of each horizontal channel Hi and the sense pulse signal SEi supplied to the sense gate line GLse(i) of each horizontal channel Hi are the same as or each other. can be different.

In the sensing mode, the gate driver 200 converts the plurality of horizontal channels into a full sensing channel with a long sensing time and a fast sensing channel with a short sensing time under the control of the timing controller 400 . Each can be operated separately. As for the full sensing channel and the fast sensing channel, the gate driver 200 drives one of the odd horizontal channels (H1) and the even horizontal channels (H2) as a full sensing channel, and the other horizontal channel is a fast sensing channel. can be driven by The gate driver 200 may sequentially drive a plurality of horizontal channels while alternating the full sensing channel and the fast sensing channel, or sequentially drive the full sensing channels first and then sequentially drive the fast sensing channel.

2 and 3 , the gate driver 200 may drive the first horizontal channel H1 as a full sensing channel and the second horizontal channel H2 as a fast sensing channel. The gate driver 200 includes a scan pulse signal SC1 and a sense pulse signal SE1 having a first pulse width relatively large to the scan gate line GLsc1 and the sense gate line GLse1 of the first horizontal channel H1 . may be supplied to drive the first horizontal channel H1 as a full sensing channel. The gate driver 200 includes a scan pulse signal SC2 and a sense pulse signal having a second pulse width smaller than the first pulse width on the scan gate line GLsc1 and the sense gate line GLse1 of the second horizontal channel H2 . By supplying SE2, the second horizontal channel H2 may be driven as a fast sensing channel. The gate driver 200 may drive the full sensing channel using the clock signal of the first pulse width supplied from the timing controller 400 , and may drive the fast sensing channel using the clock signal of the second pulse width.

The gamma voltage generator 600 generates a plurality of reference gamma voltages having different levels and supplies them to the data driver 300 . The gamma voltage generator 600 may generate or adjust a plurality of reference gamma voltages corresponding to the gamma characteristics of the display device under the control of the timing controller 400 , and may supply the generated reference gamma voltages to the data driver 300 .

The data driver 300 is controlled according to a data control signal supplied from the timing controller 400 , and converts the digital data supplied from the timing controller 400 into an analog data signal through the data lines DL1 and DL1 of the panel 100 . DL2). The data driver 300 converts digital data into an analog data signal by using grayscale voltages in which a plurality of reference gamma voltages supplied from the gamma voltage generator 500 are subdivided. The data driver 300 may supply the reference voltage to the reference lines RL1 and RL2 of the panel 100 under the control of the timing controller 400 .

The data driver 300 may respectively supply a sensing data voltage and a reference voltage to the data lines DL1 and DL2 and the reference lines RL1 and RL2 in the sensing mode under the control of the timing controller 400 . In the pixel P driven in the sensing mode, the driving TFT DT includes the sensing data voltage Vdata supplied through the data lines DL1 and DL2 and the first switching TFT ST1, and the reference lines RL1 and RL2. ) and the reference voltage supplied through the second switching TFT ST2 may be supplied and driven. The data driver 300 refers to a current reflecting the electrical characteristics (threshold voltage, mobility) of the driving TFT (DT) or the deterioration characteristic (threshold voltage) of the light emitting device 10 through the second switching TFT (ST2). After charging the line capacitors of the lines RL1 and RL2 with a voltage, the sensing voltage is sampled or converted into the sensing voltage using a current integrator.

In particular, the data driver 300 converts a plurality of column channels into sensing data by using an analog-to-digital converter (ADC) and outputs a channel and a comparator (COM) to represent a voltage region of the sensed voltage. A channel for outputting area data is provided. The analog-to-digital converter ADC may be connected to the odd column channel C1 , and the comparator COM may be connected to the even column channel C2 , and vice versa.

The analog-to-digital converter (ADC) connected to the reference line (RL1) of the odd column channel (C1) digitally converts the sensing voltage reflecting the characteristics of each pixel (P) to convert the sensing data, that is, ADC data, to the timing controller 400 output as

The comparator COM connected to the reference line RL2 of the even column channel C2 compares the sensing voltage reflecting the characteristics of each pixel P with the lower limit voltage LSL and the upper limit value USL, and the voltage of the sensing voltage Comparison data indicating an area, that is, COM data, is output to the timing controller 400 .

4 is a diagram illustrating a configuration of a comparator according to an embodiment, FIG. 5 is a graph illustrating a change in a sensing threshold voltage (Vth) of a driving TFT according to a sensing time according to an embodiment, and FIG. 6 is an embodiment It is a conceptual diagram showing the distribution characteristics of sensing data according to

4 and 5, the comparator COM has a first comparator COM1 for comparing the sensed voltage with the upper limit value USL, and a first comparator COM2 for comparing the sensed voltage with the lower limit value LSL, and A first switch SW1 that selects any one of the first and second upper limit values USL1 and USL2 according to the control signal CS of the timing controller 400 and outputs the upper limit value USL to the first comparator COM1 and a second switch SW2 that selects any one of the first and second lower limit values LSL1 and LSL2 and outputs it to the second comparator COM2 as the lower limit value LSL.

As shown in FIG. 5 , since the sensing voltage increases according to the sensing time, the first lower limit value LSL1 and the first upper limit value USL1 used in the comparator COM at the fast sensing time are the first values used in the full sensing period. 2 It is set differently from the lower limit value LSL2 and the second upper limit value USL2.

The control signal CS supplied from the timing controller 400 indicates whether a sensed horizontal channel is a fast sensing channel or a full sensing channel.

The first and second comparators COM1 and COM2 constituting the comparator COM select the first lower limit value LSL1 and the first upper limit value USL1 during the fast sensing period through the switches SW1 and SW2 to obtain the sensing voltage and In the full sensing period, the second lower limit value LSL2 and the second upper limit value USL2 are selected and compared with the sensing voltage.

The comparator COM has comparison data B1B0=11 corresponding to the first region #1 of the point defect PD in which the sensing voltage Vth is greater than the upper limit value USL, and the sensing voltage Vth is the lower limit value LSL. ) and the negative bias shift (B1B0 = 01) corresponding to the second region (#2) of the positive bias shift (PBTiS) characteristic between the upper limit value (USL), the sensing voltage (Vth) is smaller than the lower limit value (LSL) ( NBTiS) characteristic or comparison data (B1B0=00) corresponding to the third region #4 of the short-circuit failure of the light emitting device may be provided to the timing controller 400 .

Referring to FIG. 6 , the distribution of full sensing data (n bits) for the driving TFT of a normal pixel is located between the lower limit value (LSL) and the upper limit value (USL), while the driving TFT and the light emitting element (OLED) are short-circuited. It can be seen that the sensing data of a pixel having a point defect (PD) due to a defect ^{is skewed and distributed near the minimum value (0) or maximum value (2 n ) of n bits.} On the other hand, sensing data having a negative bias shift characteristic less than the lower limit value LSL is not compensated due to insufficient compensation margin.

The timing controller 400 compares the sensing voltage with the corresponding lower limit value LSL and the corresponding upper limit value USL in each of the full sensing period and the fast sensing period, from the comparison data B1B0 of the comparator COM, the region in which the sensing voltage is distributed. may be detected, and sensing data prediction processing or exception processing may be performed on the corresponding pixel according to the detection area. The timing controller 400 compares the fast sensing data supplied from the ADC with the corresponding lower and upper limit values during the fast sensing period to detect a region in which the corresponding fast sensing data is distributed, and performs sensing data prediction processing or exception processing according to the detection region can do.

7 is a flowchart illustrating a sensing method of a light emitting display device according to an exemplary embodiment, FIG. 8 is a conceptual diagram illustrating a sensing method of a light emitting display device according to an exemplary embodiment, and FIG. 9 is a sensing method of a timing controller according to an exemplary embodiment It is a block diagram showing a data prediction processing unit.

Referring to FIG. 7 , in the sensing mode, the timing controller 400 controls the gate driver 200 and the data driver 300 to complete a sensing operation including full sensing and fast sensing for one frame to perform full sensing. After acquiring data, fast sensing data, and comparison data (S612), regions for fast sensing data and comparison data are divided (S614), and prediction processing of sensing data for the corresponding pixel according to the divided regions (S616) or Exception processing (S618, S620) is performed.

The timing controller 400 alternately performs full sensing with a long sensing period and fast sensing with a short sensing time for each horizontal channel (Hn, n is a natural number) for one frame, and sensing each of the full sensing period and the fast sensing period For each period, sensing data (full sensing data, fast sensing data) through an analog-to-digital converter (ADC) channel and comparison data through a comparator (COM) channel are supplied from the data driver 300 every period.

On the other hand, the timing controller 400 controls the gate driver 200 to first sequentially perform full sensing of the horizontal channels H(2n-1) of the full sensing as shown in FIG. 9, and then perform the full sensing of the fast sensing. Horizontal channels H(2n) may be sequentially fast-sensed.

The timing controller 400 receives the scan pulse SC(2n-1) and the sense pulse SE(2n-1) for full sensing from the gate driver 200 among the plurality of pixels, and receives the ADC of the data driver 300 . Full sensing data is supplied from pixels connected to the channel.

The timing controller 400 receives the scan pulse SC(2n) and the sense pulse SE(2n) for fast sensing from the gate driver 200 among the plurality of pixels and is connected to the ADC channel of the data driver 300 . Fast sensing data is supplied from pixels.

The timing controller 400 receives a scan pulse (SC(2n-1), n is a natural number) and a sense pulse SE(2n-1) for full sensing from the gate driver 200 among the plurality of pixels, or performs fast sensing. The scan pulse SC(2n) and the sense pulse SE(2n) are supplied, and comparison data is supplied from pixels connected to the COM channel of the data driver 300 .

The timing controller 400 uses the full sensed data supplied from the data driver 300 during the full sensing period for remaining pixels that are not fully sensed, that is, fast sensed pixels and pixels of a channel connected to the comparator COM. It is possible to predict the sensing data for At this time, the timing controller 400 detects the region to which the data belongs by using the fast sensing data from the fast sensed pixel through the ADC channel and the comparison data through the COM channel regardless of full sensing and fast sensing. can

When the fast sensing data of the corresponding pixel or the comparison data of the corresponding pixel is a region of the positive bias shift (PBTiS) characteristic, the timing controller 400 performs a prediction process of the sensing data for the corresponding pixel, but a negative bias shift (NBTiS) In the case of a characteristic area or a point defect (PD) area, an exception processing is performed that does not generate compensation data using sensing data.

When it is determined that the fast sensing data of the corresponding pixel or the comparison data of the corresponding pixel is a positive bias shift (PBTiS) characteristic region between the upper limit value USL and the lower limit value LSL of the compensation margin, the timing controller 400 senses the corresponding pixel. Carry out the data prediction process. The timing controller 400 may predict the sensed data of the fast-sensed or comparatively sensed pixel by using the full sensed data of the surrounding pixels and the interpolation method used.

For example, the timing controller 400 performs full sensing from P11, P13, P31, and P33 among the nine pixels P11, P12, P13, P21, P22, P23, P31, P32, and P33 illustrated in FIG. 8 . Data may be supplied, comparison data may be supplied from P12, P22, and P32, and fast sensing data may be supplied from P21 and P23. The sensing data of the P12 pixel can be predicted using the full sensing data of P11 and P13, the sensing data of the P21 pixel uses the full sensing data of P11 and P31, and the sensing data of the P23 pixel is the full sensing data of P13 and P33 , the sensing data of the P32 pixel may be predicted using P31 and P32 full sensing data, and the sensing data of the P22 pixel may be predicted using the full sensing data of P11, P13, P31, and P33.

Meanwhile, referring to FIG. 10 , the timing controller 400 performs fast sensing through the sensing data generating unit 600 using an artificial intelligence neural network that generates high-resolution data from full sensing data, image accumulation values, and low-resolution data of surrounding pixels. Alternatively, the sensing data of the comparatively sensed pixel may be predicted. The sensing data generation unit 600 uses N*N (N is an integer greater than 2) pixel unit sampled full sensing data of surrounding pixels and 1*1 pixel unit usage data according to image accumulation using various nonlinear transformation techniques. 1*1 pixel unit sensing data can be generated using a deep learning algorithm that performs a combination of .

If the timing controller 400 determines that the fast sensing data of the corresponding pixel or the comparison data of the corresponding pixel is a negative bias shift (NBTiS) characteristic region less than the lower limit LSL, the sensing data and compensation data for the corresponding pixel are not generated. , the compensation data of any one of the surrounding pixels is copied or corrected and used. This is because even if the sensing data is predicted, compensation for the sensing data is impossible due to the lack of a compensation margin.

If the timing controller 400 determines that the fast sensing data of the corresponding pixel or the comparison data of the corresponding pixel is a point defect (PD) region exceeding the upper limit value (LSL), the timing controller 400 performs flag processing to generate sensing data and compensation data for the corresponding pixel. Instead, specific data, for example, black data, may be supplied as corresponding pixel data.

As described above, a light emitting display device and a sensing method thereof according to an exemplary embodiment receive partially sampled full sensing data from among a plurality of pixels through a combination of a full sensing channel and a fast sensing channel, an ADC output channel, and a comparator output channel. By predicting sensing data for pixels that are fast-sensed or connected to the comparator output, the sensing time can be shortened, the complexity of the sensing circuit can be reduced, and the memory capacity for storing the sensing data can be reduced, thereby reducing the manufacturing cost. can

Accordingly, it is possible to reduce the increase in resources (circuit, time, memory, etc.) required for sensing according to the increase in resolution and decrease the increase in manufacturing cost.

Those skilled in the art from the above description will be able to see that various changes and modifications can be made without departing from the technical spirit of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

100: panel 200: gate driver
300: data driver 400: timing controller
600: sensing data prediction processing unit 700: memory
500: gamma voltage generator

Claims (21)

a panel including a plurality of horizontal channels and a plurality of column channels composed of a plurality of pixels;
a gate driver dividing the plurality of horizontal channels into a full sensing horizontal channel and a fast sensing horizontal channel having different sensing times;
a data driver including an analog-to-digital converter connected to a first column channel among the plurality of column channels and a comparator connected to a second column channel; and
By controlling the gate driver and the data driver in the sensing mode, the full sensing data for the first pixel among the plurality of pixels from the data driver, the fast sensing data for the second pixel, the comparison data for the third pixel, a timing controller to obtain comparison data for 4 pixels;
and the timing controller generates the sensing data of each of the second pixel, the third pixel, and the fourth pixel by performing interpolation prediction processing using the full sensing data of the first pixels adjacent thereto. The method according to claim 1,
The first pixel comprises a pixel constituting the first column channel while constituting the full sensing scan channel,
The second pixel comprises a pixel constituting the first column channel while constituting the fast scan channel,
The third pixel comprises a pixel constituting the second column channel while constituting the full scan channel,
The fourth pixel constitutes the second column channel while constituting the fast scan channel. The method according to claim 1,
The comparator receives a sensing voltage to which the characteristic is reflected from the third pixel or the fourth pixel, compares the sensing voltage with a lower limit value and an upper limit value to obtain comparison data indicating a characteristic region of the third pixel or the fourth pixel. A light emitting display device that outputs to a timing controller. 4. The method according to claim 3,
the comparator
The control signal supplied from the timing controller,
When indicating the full sensing scan channel, comparing the sensing voltage with a first lower limit value and a first upper limit value,
When indicating the fast scan channel, the light emitting display device compares the sensing voltage with a second lower limit value different from the first lower limit value and a second upper limit value different from the first upper limit value. 4. The method according to claim 3,
The comparative data is
represents a first area greater than the upper limit, or
represents a second region between the upper limit value and the lower limit value, or
A light emitting display device indicating a third region less than the lower limit. 6. The method of claim 5,
The first area represents a point defect area,
The second region represents a positive bias shift characteristic region,
The third region represents a negative bias shift characteristic region. 6. The method of claim 5,
the timing controller
The light emitting display device divides the fast sensing data into any one of first to third regions by comparing the fast sensing data with the upper limit value and the lower limit value. 8. The method of claim 7,
the timing controller
When the comparison data or the fast sensing data corresponds to the second region, the light emitting display device predicts and generates sensing data of the corresponding pixel by interpolating the full sensing data of the adjacent first pixels. 8. The method of claim 7,
the timing controller
When the comparison data or the fast sensing data corresponds to the second region, the sensing data of the corresponding pixel is obtained by using the full sensing data of the adjacent first pixels and the deep learning method using the usage of each pixel according to the image accumulation. A light emitting display device that generates predictions. 7. The method of claim 6,
the timing controller
If the comparison data or fast sensing data corresponds to the first area, flag processing is performed so that preset data is supplied to the corresponding pixel without generating sensing data and compensation data for the corresponding pixel;
When the comparison data or the fast sensing data corresponds to the third region, the light emitting display device compensates the data of the corresponding pixel by using the data of the surrounding pixels without generating the sensing data and the compensation data for the corresponding pixel. The method according to claim 1,
the gate driver
The light emitting display device drives one of the even scan channels and the odd scan channels constituting the plurality of scan channels as the full sensing horizontal channel and drives the other scan channels as the fast horizontal channel. The method according to claim 1,
The gate driver during one frame,
Alternating the full-sensing horizontal channel and the fast horizontal channel and sequentially driving the plurality of horizontal channels,
A light emitting display device that sequentially drives a plurality of the full sensing horizontal channels and then sequentially drives a plurality of the fast horizontal channels. The method according to claim 1,
One of the odd column channels and the even column channels constituting the plurality of column channels is connected to the analog-to-digital converter, and the other column channel is connected to the comparator. dividing and driving a plurality of horizontal channels composed of a plurality of pixels into a full-sensing horizontal channel having different sensing times and a fast-sensing horizontal channel;
During the full sensing period in which the full sensing horizontal channel is driven, the full sensing data for the first pixel is outputted through the analog-to-digital converter connected to the first column channel among the plurality of column channels, and the full sensing data connected to the second column channel is output. outputting comparison data for a third pixel through a comparator;
outputting fast sensing data for a second pixel through the analog-to-digital converter during a fast sensing period in which the fast sensing horizontal channel is driven, and outputting comparison data for a fourth pixel through the comparator;
obtaining full sensing data for the first pixel, fast sensing data for the second pixel, comparison data for the third pixel, and comparison data for the fourth pixel; and
and generating the sensing data for each of the second pixel, the third pixel, and the fourth pixel by performing interpolation prediction processing using the full sensing data of the first pixels adjacent thereto. 15. The method of claim 14,
The first pixel comprises a pixel constituting the first column channel while constituting the full sensing scan channel,
The second pixel comprises a pixel constituting the first column channel while constituting the fast scan channel,
The third pixel comprises a pixel constituting the second column channel while constituting the full sensing scan channel,
The fourth pixel constitutes the fast scan channel and the second column channel constitutes the sensing method of the light emitting display device. 15. The method of claim 14,
The comparator receives a sensing voltage reflecting the characteristic from the third pixel or the fourth pixel, compares the sensing voltage with a lower limit value and an upper limit value to obtain comparison data indicating a characteristic region of the third pixel or the fourth pixel print out,
The comparative data is
represents a first area greater than the upper limit, or
represents a second region between the upper limit value and the lower limit value, or
A sensing method of a light emitting display device indicating a third region less than the lower limit. 17. The method of claim 16,
the comparator
During the full sensing period, comparing the sensing voltage with a first lower limit value and a first upper limit value,
During the fast sensing period, the sensing voltage is compared with a second lower limit value different from the first lower limit value and a second upper limit value different from the first upper limit value. 17. The method of claim 16,
A sensing method of a light emitting display device for dividing the fast sensing data into any one of the first to third regions by comparing the fast sensing data with the upper limit value and the lower limit value. 19. The method of claim 18,
When the comparison data or the fast sensing data corresponds to the second region, the sensing data of the corresponding pixel is obtained by using the full sensing data of the adjacent first pixels and the deep learning method using the usage of each pixel according to the image accumulation. A sensing method of a light emitting display device for predictive generation. 19. The method of claim 18,
When the comparison data or the fast sensing data corresponds to the first region or the third region, an exception is processed without generating sensing data for a corresponding pixel. 15. The method of claim 14,
an odd scan channel constituting the plurality of scan channels is driven as the full sensing horizontal channel, and an even scan channel is driven as the fast sensing channel;
An odd column channel constituting the plurality of column channels is connected to the analog-to-digital converter, and an even column channel is connected to the comparator.

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