KR102453087B1 - Display device, data driver and method for compensating data thereof - Google Patents

Abstract

In the present specification, a display panel on which two or more subpixels are disposed, two or more source printed circuit boards, one end connected to each source printed circuit board and the other end connected to the display panel and at least two or more data voltages are supplied to the data lines. At least one included in each of the source driver integrated circuits and the two or more source driver integrated circuits, and a sensing unit that senses the voltage of the sensing node of the two or more subpixels through a sensing line, and the voltage of the sensing node from the sensing unit in a digital form Provides compensation data that compensates input data based on an ADC (Analog Digital Converter) that converts sensing data and an offset value that compensates for the sensing data and the sensing data deviation of two adjacent source printed circuit boards to two or more source driver integrated circuits A display device including a controller, a data driver thereof, and a data compensation method are provided.

Description

Display device and data driver, data compensation method of display device

The present embodiment relates to a display device for displaying an image, a data driver, and a data compensation method thereof.

As the information society develops, demands for display devices for displaying images are increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display devices (PDPs), organic Various display devices such as an organic light emitting display device (OLED) are being used.

Such a display device includes a display panel in which data lines and gate lines are formed, subpixels are defined at points where the data lines and gate lines intersect with each other, and a data driver supplying data signals to the data lines; It further includes a gate driver for supplying a scan signal to the gate lines.

Transistors are disposed in each sub-pixel defined in the display panel, and a characteristic value of the transistor in each sub-pixel may change according to a driving time, or a characteristic value deviation of the transistor between each sub-pixel may occur. Alternatively, when the display device is an organic light emitting display device, a deviation in deterioration of organic light emitting diodes (OLEDs) in each sub-pixel may occur. This phenomenon may cause luminance non-uniformity between sub-pixels to deteriorate image quality.

Therefore, in order to solve the luminance non-uniformity between sub-pixels, a pixel compensation technique for compensating for variations or deviations in characteristics of devices (eg, transistors, organic light emitting diodes) in a circuit has been proposed. This pixel compensation is a technology for preventing or reducing luminance non-uniformity of sub-pixels by sensing a specific node of a circuit in a sub-pixel and changing data supplied to each sub-pixel using the sensing result.

In spite of providing such a pixel compensation function, output deviation occurs due to differences in characteristics such as wiring or bonding of source printed circuit boards (S-PCB) including source driver integrated circuits. A block dim phenomenon occurs at the boundary of the printed circuit boards.

Against this background, an object of the present embodiment is to reduce output deviation due to differences in characteristics such as wiring or bonding in a source printed circuit board including source driver integrated circuits even while providing a pixel compensation function, resulting in a block dim phenomenon at the boundary of the source printed circuit boards is to prevent

In order to achieve the above object, in one aspect, an embodiment provides a display panel on which two or more subpixels are disposed and two or more source printed circuit boards, one end connected to each source printed circuit board and the other end connected to the display panel at least one of the two or more source driver integrated circuits and the two or more source driver integrated circuits for supplying a data voltage corresponding to specific input data to the data lines, the voltage of the sensing node of the two or more sub-pixels is sensed by the sensing line The sensing unit that senses through the analog digital converter (ADC) that converts the voltage of the sensing node into digital sensing data from the sensing unit, the sensing data, and the offset value that compensates for the deviation of the sensing data of two adjacent source printed circuit boards. Provided is a display device including a controller that provides compensation data obtained by compensating input data based on the input data to two or more source driver integrated circuits.

In another aspect, another embodiment provides two or more source printed circuit boards, one end connected to each source printed circuit board and the other end connected to the display panel and supplying data voltages corresponding to specific input data through data lines. At least one of the source driver integrated circuits and the two or more source driver integrated circuits is included in each of the sensing unit for sensing the voltage of the sensing node of the at least two sub-pixels through the sensing line, and the voltage of the sensing node is obtained from the sensing unit in a digital form It includes an ADC (Analog Digital Converter) that converts the sensing data of The driver integrated circuit provides a data driver provided from the controller.

In another aspect, in another embodiment, in the two or more source printed circuit boards, the plane average values of all sensing data sensed by the sensing unit included in the source driver integrated circuit connected to the two printed circuit boards are not the same Determining whether or not, if the plane average values are not the same, each of the offset values of all sensing nodes for the two printed circuit boards is determined using the plane average values, and sensing data and all sensing for the printed circuit boards supplying compensation data obtained by compensating the input data based on the offset values of the nodes to the source driver integrated circuit connected to the printed circuit boards. When the plane average values are the same, sensing at least two adjacent two printed circuit boards The offset values of the corresponding sensing nodes of different printed circuit boards are determined using the average value of the sensing data of the sensing nodes for the lines, and the input data is compensated based on the sensing data and the offset values of the sensing nodes. Provided is a data compensation method for a display device, comprising the step of supplying compensation data to a source driver integrated circuit connected to each printed circuit board associated with corresponding sensing nodes.

As described above, according to the present embodiment, although the pixel compensation function is provided, the output deviation due to characteristics such as wiring or bonding is reduced in the source printed circuit board including the source driver integrated circuits, thereby reducing the block dim at the boundary of the source printed circuit boards. It has the effect of preventing the phenomenon.

1 is a schematic system configuration diagram of a display device according to an exemplary embodiment.
2A is a diagram illustrating an arrangement of a source printed circuit board and a source driver integrated circuit of a data driver in a display device according to an exemplary embodiment.
2B is a diagram illustrating three source printed circuit boards on which a source driver integrated circuit is disposed on a display panel.
FIG. 2C is a diagram illustrating four source printed circuit boards on which a driving integrated circuit is disposed on a display panel.
3 is a diagram illustrating each source driver integrated circuit included in a data driver in a display device according to an exemplary embodiment.
4 is a conceptual diagram exemplarily illustrating pixel compensation of a display device according to an embodiment.
5 is a diagram for illustratively explaining pixel compensation of a display device according to an embodiment.
6A and 6B are diagrams illustrating a block dim phenomenon occurring at a boundary between source printed circuit boards despite providing a pixel compensation function.
7A and 7B are diagrams for explaining a process of preventing a planar block dim phenomenon in a display device according to an exemplary embodiment.
8A is an enlarged plan view of area E of FIG. 6A .
FIG. 8B is a partially enlarged view of one source driver integrated circuit included in each of the two source printed circuit boards of FIG. 8A .
9 is a diagram illustrating sensing data extracted from the ADC of FIGS. 8A and 8B in a display device according to an exemplary embodiment.
10 is a conceptual diagram illustrating a method of reducing a linear block dim phenomenon in a display device according to an exemplary embodiment.
11A and 11B are diagrams schematically illustrating a state in which an offset value is applied at a boundary (line) of a source printed circuit board in a display device according to an exemplary embodiment.
12 is a flowchart of a data compensation method of a display device according to another exemplary embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected,” “coupled,” or “connected” through another component.

1 is a schematic system configuration diagram of a display device according to an exemplary embodiment. 2A is a diagram illustrating an arrangement of a source printed circuit board and a source driver integrated circuit of a data driver in a display device according to an exemplary embodiment.

Referring to FIG. 1 , a display device 100 according to an exemplary embodiment includes a display panel 110 , a data driver 120 , a gate driver 130 , a controller 140 , and the like.

In the display panel 110 , data lines DL1 , DL2 , ... , DLm and gate lines GL1 , GL2 ... , GLn are formed, and data lines DL1 , DL2 , ... , DLm) and the gate lines GL1 , GL2 ... , GLn intersect each sub-pixel (SP).

The data driver 120 supplies a data voltage to the data lines DL1, DL2, ..., DLm. The data driver 120 includes two or more data driver integrated circuits (DICs) 200 .

The gate driver 130 sequentially supplies scan signals to the gate lines GL1 , GL2 ... , GLn.

The controller 140 controls the data driver 120 and the gate driver 130 .

The data driver 120 stores image data (Data) input from the host system (not shown) in a memory (not shown) under the control of the controller 140 , and when a specific gate line is opened, the corresponding image data ( Data') is converted into an analog data voltage Vdata and supplied to the m data lines DL1, ..., DLm, thereby driving the m data lines DL1, ..., DLm.

As shown in FIG. 2A , the data driver 120 includes a plurality of source driver integrated circuits (Source Driver IC, also referred to as Data Driver IC, SDIC #1, ... , SDIC #10). may include, these plurality of source driver integrated circuits (SDIC #1, ... , SDIC #10) are displayed in a tape automated bonding (TAB) method or a chip-on-glass (COG) method. It may be connected to a bonding pad of the panel 110 , may be disposed directly on the display panel 110 , or may be integrated and disposed on the display panel 110 in some cases.

The plurality of source driver integrated circuits SDIC #1, ... , SDIC #10 may be implemented in a Chip On Film (COF) method. In each of the plurality of source driver integrated circuits (SDIC #1, ... , SDIC #10), one end is at least two source printed circuit boards (Source Printed Circuit Board, S-PCB #1, S-PCB #2) , and the other end is connected to the display panel 110 . For example, each of the five source driver integrated circuits (SDIC #1, ... , SDIC #5) has one end connected to the first printed circuit board (S-PCB #1) and the remaining five source driver integrated circuits ( SDIC #6, ... , SDIC #10 may each have one end connected to the second printed circuit board (S-PCB #2).

Meanwhile, a circuit including at least one transistor is configured in the sub-pixel formed in the display panel 110 . Here, the circuit in the sub-pixel may further include at least one capacitor, an organic light emitting diode (OLED), or the like, according to a circuit design method or a type of display device, in addition to at least one transistor.

The display device 100 according to the embodiment provides a “pixel” for compensating for a luminance deviation between sub-pixels that occurs according to a change or deviation in characteristic values (eg, threshold voltage, mobility, etc.) of a transistor included in a circuit within the sub-pixel. compensation function”.

Accordingly, in the display panel 110 , one “sensing line” (SL), which is connected to a circuit in the sub-pixel and exists in one or more sub-pixel columns, may be formed. The display device 100 according to the embodiment may sense a characteristic value of a transistor included in a circuit in a sub-pixel through a sensing line to provide a pixel compensation function.

In spite of providing such a pixel compensation function, an output deviation occurs due to differences in characteristics of the source driver integrated circuits such as wiring or bonding of the source printed circuit boards (S-PCB) including the source driver integrated circuits. A block dim phenomenon occurs at the boundary between them.

2B is a diagram illustrating three source printed circuit boards on which a source driver integrated circuit is disposed on a display panel. FIG. 2C is a diagram illustrating four source printed circuit boards on which a driving integrated circuit is disposed on a display panel.

When the display panel 110 has a large area, the number of source driver integrated circuits increases, and the number of source printed circuit boards also increases. For example, the source printed circuit board (SPCB) may include three source printed circuit boards (SPCB #1 to SPCB #3) as shown in FIG. 2B , and four source printed circuit boards as shown in FIG. 2C . The circuit boards (SPCB #1 to SPCB #4) may be included, and five or more source printed circuit boards (SPCB #1 to SPCB #n (n is a natural number greater than 4)) may be included.

In the following, when the source printed circuit board (SPCB) includes four source printed circuit boards (SPCB #1 to SPCB #4) as shown in FIG. 2C , compensation for errors between the source printed circuit boards will be described. , even if two or more source printed circuit boards are included, the error between the source printed circuit boards can be equally compensated. When the source printed circuit board (SPCB) includes four source printed circuit boards (SPCB #1 to SPCB #4) as shown in FIG. 2C , the four source printed circuit boards (SPCB #1 to SPCB #4) are It may correspond to the four areas A, B, C, and D of the display panel 110 .

3 is a diagram illustrating each source driver integrated circuit included in a data driver in a display device according to an exemplary embodiment.

Referring to FIG. 3 , each source driver integrated circuit 200 includes a driving configuration for supplying a data voltage Vdata to a plurality of sub-pixels in charge and a sensing configuration for a plurality of sub-pixels in charge.

Each source driver integrated circuit 200 includes a digital-to-analog converter (DAC) 210 that converts data input from the controller 140 into an analog data voltage Vdata.

Each of the source driver integrated circuits 200 includes a sensing unit 230 that senses the voltage Vsen of the sensing node of the circuit within the plurality of sub-pixels in charge through two or more sensing lines (which may be the same concept as the sensing channel). and an ADC 220 that receives an input from the sensing unit and converts it into digital sensing data Dsen and outputs it. Each of the source driver integrated circuits 200 may include a single component that performs two functions in which the sensing unit 230 and the ADC 220 are integrated, for example, a sensing unit or an ADC.

As shown in FIG. 3 , one ADC 220 and one sensing unit 230 are included in one source driver integrated circuit 200 . Accordingly, if there are two or more source driver integrated circuits 200 in the display device 100 , two or more ADC 220 and the sensing unit 230 are also present in the display device 100 .

One sensing unit 230 included in one source driver integrated circuit 200 is connected to two or more sensing lines SL, and senses a voltage Vsen through each sensing line.

Here, one sensing line SL connects the sensing unit 230 and one or two or more sub-pixel columns. That is, each of the two or more sensing lines connected to one sensing unit 230 may be a line sensing a voltage of a sensing node of a circuit within one subpixel, but in the case of a shared structure, the circuits within two or more subpixels It may be a line that simultaneously or sequentially senses the voltage of the sensing node.

The sensing unit 230 samples the voltage Vsen of the sensing node as a sampling circuit that may include a switch or a capacitor.

Although not shown, the sensing unit 230 may include a multiplexer (hereinafter referred to as MUX), a buffer, and the like.

The ADC 220 included in one source driver integrated circuit 200 converts the sensing voltage Vsen measured by the sensing unit 230 through a sensing channel corresponding to each of the two or more sensing lines to digital sensing data ( Dsen) and output it.

4 is a conceptual diagram exemplarily illustrating pixel compensation of a display device according to an embodiment.

Referring to FIG. 4 , the sensing unit 230 in the source driver integrated circuit 200 includes a sensing node (eg: The voltage (Vsen) of the source or drain node of the transistor is sensed. The ADC 220 receives the voltage Vsen sensed by the sensing unit 230, converts it into digital type sensing data Dsen, and outputs it.

The controller 140 uses the sensing data Dsen to compensate the characteristic values (eg, threshold voltage Vth, mobility μ, etc.) of the transistor TR in the sub-pixel SP. Data to be supplied to the pixel SP is changed, and compensation data Data' is output.

Accordingly, the DAC 210 in the source driver integrated circuit 200 converts the compensation data Data' into a data voltage Vdata' and outputs the converted data.

Accordingly, the corresponding sub-pixel SP receives the data voltage Vdata' capable of compensating for the characteristic value of the transistor TR through the data line DL, and prevents or prevents luminance non-uniformity of the corresponding sub-pixel SP. can be reduced.

The pixel compensation briefly described with reference to FIG. 4 will be described in more detail with reference to FIG. 5 .

5 is a diagram for illustratively explaining pixel compensation of a display device according to an embodiment.

Referring to FIG. 5 , one sensing unit 230 has three sensing channels CH1 , CH2 , and CH3 . These three sensing channels (CH1, CH2, CH3) are connected to correspond to the three sensing lines (SL1, SL2, SL3). Each of the three sensing lines SL1 , SL2 , and SL3 is connected to the four sub-pixels SP. That is, SL1 corresponding to CH1 is shared and connected to SP1, SP2, SP3, and SP4. SL2 corresponding to CH2 is shared and connected to SP5, SP6, SP7 and SP8. SL3 corresponding to CH3 is shared and connected to SP9, SP10, SP11, and SP12. Four sub-pixels SP constitute one pixel P.

The sensing unit 230 may sense the voltage Vsen of the sensing node in one subpixel SP through each of the three sensing lines SL1 , SL2 , and SL3 at one point in time.

Each of the three sensing lines SL1 , SL2 , and SL3 is connected to the latches L1 , L2 , and L3 in which the sensing voltage Vsen of the sensing node in the corresponding subpixel is stored. The above-mentioned latches L1, L2, and L3 may be implemented as capacitors.

The sensing unit 230 reads the voltages Vsen1, Vsen2, and Vsen3 stored in the three latches L1, L2, and L3, and the sensing voltage Vsen1, Vsen2 and Vsen3) can be measured simultaneously.

The ADC 220 converts the voltages Vsen1 , Vsen2 , and Vsen3 sensed by the sensing unit 230 into digital form, outputs the converted sensing data Dsen1 , Dsen2 , and Dsen3 , and stores it in the memory 400 . make it

As described above, the controller 140 reads all the sensing data (Dsen1, Dsen2, Dsen3, ...) stored in the memory 400 and changes the data to be supplied to the sub-pixels to change the changed data (Data) ') is output to the source driver integrated circuit 200 .

Accordingly, the source driver integrated circuit 200 receives the changed data Data', converts it into an analog data voltage Vdata', and supplies it to the corresponding sub-pixel through an output buffer (not shown).

In spite of providing such a pixel compensation function, as described above, due to differences in characteristics of the source printed circuit boards S-PCB such as wiring or bonding of the source printed circuit boards S-PCB including the source driver integrated circuits. Due to the output deviation, a block dim phenomenon occurs at the boundary of the source printed circuit boards (S-PCB).

6A and 6B are diagrams illustrating a block dim phenomenon occurring at a boundary between source printed circuit boards despite providing a pixel compensation function.

Although the pixel compensation function is provided, the block dim phenomenon occurring at the boundary of the source printed circuit boards appears only at the boundary of the source printed circuit boards (S-PCB) as shown in FIG. 6A or as shown in FIG. 6B . Likewise, each of the source printed circuit boards (S-PCB) may appear as a whole. As in the former case, the block dim appearing only at the boundary of the source printed circuit boards (S-PCB) is called a block dim in the form of a line, and as in the latter case, the block dim appearing as a whole of each source printed circuit board (S-PCB) is a planar shape. It is called the block dim of

In the present specification, if the surface average values of all the sensing data Dsen sensed by the sensing unit included in the source driver integrated circuit respectively connected to the two adjacent printed circuit boards S-PCB are equal to or not substantially equal to each other, It is regarded as a block dim in the form of a line, and when the plane average values are identical or substantially identical to each other, it is regarded as a block dim in the form of a line.

In order to reduce the aforementioned block dim phenomenon, the controller 140 compensates the input data based on the sensing data Dsen and the offset value for compensating for the deviation of the sensing data of the two adjacent source printed circuit boards (S-PCB). One compensation data may be provided to two or more source driver integrated circuits 200 .

Specifically, in order to prevent block dimming in the form of a plane, the controller 140 collects all sensing data sensed by the sensing unit 230 included in the source driver integrated circuit 200 connected to two adjacent printed circuit boards Dsen) to determine the offset values of all sensing nodes for the two printed circuit boards (S-PCB), respectively, and the sensing data (Dsen) and the two printed circuit boards (S-PCB) Compensation data obtained by compensating the input data based on the offset values of all sensing nodes may be supplied to the source driver integrated circuit 200 connected to the two printed circuit boards (S-PCB).

In addition, the controller 140 uses a line average value of sensing data Dsen for sensing nodes of two adjacent printed circuit boards S-PCB and adjacent two sensing lines. Each printed circuit board (S) related to the sensing nodes determines the offset values of the corresponding sensing nodes with respect to each of the sensing nodes, and sets the sensing data Dsen and compensation data obtained by compensating the input data based on the offset values of the sensing nodes. -PCB) and connected to the source driver integrated circuit 200 may be supplied.

The controller 140 includes all sensing data Dsen sensed by the sensing unit 230 included in the source driver integrated circuit 200 connected to the two adjacent first and second printed circuit boards (S-PCB). When the first and second surface average values of are not equal to each other, first and second offset values of all sensing nodes for the first and second printed circuit boards are determined using the first and second surface average values, , the sensing data and compensation data obtained by compensating input data based on the first and second offset values of all sensing nodes for the first and second printed circuit boards (S-PCB) to the first and second printed circuit boards ( S-PCB) and connected to the source driver integrated circuit 200 .

7A and 7B are diagrams for explaining a process of preventing a planar block dim phenomenon in a display device according to an exemplary embodiment.

Referring to FIG. 7A , when there are three printed circuit boards, the controller 140 controls all sensing nodes sensed by the sensing unit 230 included in the source driver integrated circuit 200 connected to the printed circuit boards. Determination of offset values of sensing nodes in each printed circuit board (S-PCB) using the mean of the sensing data (Dsen), and the sensing data (Dsen) and each printed circuit board (S-PCB) Compensation data obtained by compensating input data based on the offset values of the sensing nodes is supplied to the source driver integrated circuit 200 connected to each printed circuit board (S-PCB).

For example, a mean of the sensing data Dsen for all sensing nodes sensed by the sensing unit 230 corresponding to regions A, B, and C of the display panel 110 is calculated. Then, the plane mean values (meanA, meanB, meanC) of each of the areas A, B, and C are calculated. The source driver integrated circuit 200 that exists in each area compares the surface average values (meanA, meanB, meanC) of each area with the overall surface average value (mean) and sets the offset values (OffsetA, OffsetB, OffsetC) corresponding to the difference. supply to

Referring to FIG. 7B , when there are four or more printed circuit boards, the controller 140 provides sensing data Dsen for sensing nodes sensed by the sensing unit 230 included in the printed circuit boards located inside. ) of the first plane average value (mean1) and the plane average values (meanA, meanD) of the sensing data Dsen for the sensing nodes sensed by the sensing unit 230 included in the printed circuit boards located outside. ) using the first plane average value (mean1) and the second and third plane average values (mean(2), mean(3)), respectively, to obtain the offset values (OffsetA, OffsetB, OffsetC, OffsetD) of the sensing nodes. ) is determined, and compensation data obtained by compensating input data based on the sensing data Dsen and offset values (OffsetA, OffsetB, OffsetC, OffsetD) of the sensing nodes on each printed circuit board (S-PCB) is applied to each printed circuit. It is supplied to the source driver integrated circuit 200 connected to the substrate (S-PCB).

For example, a first surface average value mean1 of sensing data Dsen for sensing nodes sensed by the sensing unit 230 corresponding to regions B and C inside the display panel 110 is calculated. .And calculate the mean values (meanA, meanB, meanC, meanD) of each of the areas A, B, C, and D. The second surface average value by averaging the surface average value (meanA) and the first surface average value (mean1) of the sensing data Dsen for the sensing nodes sensed by the sensing unit 230 corresponding to the area A located outside Calculate (mean2). In the case of regions A and B, offset values OffsetA and OffsetB are determined based on the second surface mean value mean2.

Similarly, by averaging the surface average value (meanD) and the first surface average value (mean1) of the sensing data Dsen for the sensing nodes sensed by the sensing unit 230 corresponding to the region D located outside the other side, A third plane mean value (mean3) is calculated. In the case of regions C and D, offset values OffsetC and OffsetD are determined based on the third plane mean value mean3.

As described with reference to FIG. 4 , the controller 140 receives input data based on sensing data Dsen and offset values (OffsetA, OffsetB, OffsetC, OffsetD) of sensing nodes on each printed circuit board (S-PCB). Compensation data (Data') obtained by compensating (Data) is supplied to the source driver integrated circuit 200 connected to each printed circuit board (S-PCB).

The DAC 210 in the source driver integrated circuit 200 converts the compensation data Data' into a data voltage Vdata' and outputs the converted data.

FIG. 8A is an enlarged plan view of area E of FIG. 6A . FIG. 8B is a partially enlarged view of one source driver integrated circuit included in each of the two source printed circuit boards of FIG. 8A .

Referring to FIG. 8A , at a boundary between one first source printed circuit board (S-PCB#1) and another second source printed circuit board (S-PCB#2), a first source driver integrated circuit 200a and the second source driver integrated circuit 200b are disposed adjacent to each other.

8A and 8B , the linear block dim phenomenon occurs at an output boundary between one first source printed circuit board (S-PCB#1) and another second source printed circuit board (S-PCB). will occur

Referring to FIG. 8B , the ADC5 220a and the first sensing unit 230a and the ADC6 220b and the second sensing unit 230b are respectively disposed. The first sensing unit 230a and the second sensing unit 230b are connected to n sensing lines or sensing channels, and the first source printed circuit board (S-PCB#1) and the second source printed circuit board ( At the boundary of S-PCB#2, three sensing channels CH(n-2), CH(n-1), CH(n) connected to the first sensing unit 230a are disposed, and the second sensing unit 230a is disposed. Three sensing channels CH1, CH2, and CH3 connected to the unit 230b may be disposed.

Hereinafter, a line average value is calculated using three sensing channels and an offset value for the sensing channels is calculated using the line average value. However, if the number of sensing lines used to calculate the line average value is two or more, any number is relevant none.

9 is a diagram illustrating sensing data extracted from the ADC of FIGS. 8A and 8B in a display device according to an exemplary embodiment. 10 is a conceptual diagram illustrating a method of reducing a linear block dim phenomenon in a display device according to an exemplary embodiment.

9 and 10 , the controller 140 transmits the sensing nodes sensed by the sensing units 230a and 230b included in the printed circuit boards S-PCB#1 and S-PCB#2. When the plane mean values (meanA, meanB) of the sensing data Dsen are equal to each other, the three sensing channels CH(n-2), CH(n-1), CH(n)) and the line average values (mean_a, mean_b) of the sensing data Dsen of the sensing nodes for each of the three sensing channels CH1, CH2, and CH3 of the second sensing unit 230b. Offset values (Offset_a, Offset_b) of corresponding sensing nodes of different printed circuit boards (S-PCB#1, S-PCB#2) are determined.

Specifically, the first sensing unit 230a included in the first source driver integrated circuit 200a includes three sensing channels CH(n-2) and CH(n) adjacent to the second source driver integrated circuit 200b. -1) and CH(n)), the same voltage can be input. The ADC5 220a converts the voltage sensed by the first sensing unit 230a into a digital form, and converts three different sensed data Dch(n-2), Dch(n-1), Dch(n) )) and stored in the memory 400 .

The controller 140 obtains a line average value mean_a by averaging three different sensing data Dch(n-2), Dch(n-1), and Dch(n).

As described above, the ADC6 220b and the second sensing unit 230b included in the second source driver integrated circuit 200b also include three different pieces of sensing data Dch1 and adjacent to the first source driver integrated circuit 200a. Dch2 and Dch3) are outputted and stored in the memory 400, and the controller 140 averages three different sensing data Dch1, Dch2, and Dch3 to calculate a line average value mean_b.

Offset values (Offset_a, Offset_b) are calculated from the difference between the obtained line average values (mean_a, mean_b) and their total line average values (mean).

As described with reference to FIGS. 4 and 8B , the controller 140 includes three sensing channels CH(n-2), CH(n-1), CH(n) of the first sensing unit 230a and Compensation data ( Data') is supplied to the corresponding source driver integrated circuits 200a and 200b connected to the respective printed circuit boards S-PCB#1 and S-PCB#2 associated with the corresponding sensing nodes.

The DAC 210 in the source driver integrated circuits 200a and 200b includes three sensing channels CH(n-2), CH(n-1), CH(n) of the first sensing unit 230a and The compensation data Data' for the sub-pixels related to the three sensing channels CH1, CH2, and CH3 of the second sensing unit 230b is converted into a data voltage Vdata' and output.

11A and 11B are diagrams schematically illustrating a state in which an offset value is applied at a boundary (line) of a source printed circuit board in a display device according to an exemplary embodiment.

Referring to FIG. 11A , the three sensing channels CH of the first sensing unit 230a at the boundary between the first source printed circuit board S-PCB#1 and the second source printed circuit board S-PCB#2 (n-2), CH(n-1), CH(n)) and offset values (Offset_a, Offset_b) of sensing nodes for each of the three sensing channels CH1, CH2, and CH3 of the second sensing unit 230b ), three sensing channels (CH(n-2), CH(n-1), CH(n)) of the first sensing unit 230a and three sensing channels of the second sensing unit 230b ( A block dim in the form of a line occurring at the boundary between the first source printed circuit board (S-PCB#1) and the second source printed circuit board (S-PCB#2) by reducing the output difference for each of CH1, CH2, and CH3) phenomenon can be reduced.

Referring to FIG. 11B , the controller 140 determines the offset values of some sensing nodes adjacent to the at least two sensing nodes by reflecting the offset values of the at least two sensing nodes, and the sensing data Dsen and each print Some sensing nodes receive compensation data obtained by compensating input data based on offset values (Offset_a, Offset_b) of at least two sensing nodes and some sensing nodes adjacent to the circuit board (S-PCB#1, S-PCB#2) may be supplied to the source driver integrated circuit 200 connected to each of the printed circuit boards (S-PCB#1, S-PCB#2) related thereto.

Specifically, at the boundary between the first source printed circuit board (S-PCB#1) and the second source printed circuit board (S-PCB#2), the three sensing channels (CH(n-) of the first sensing unit 230a 2), CH(n-1), CH(n)) and offset values (Offset_a, Offset_b) of the sensing nodes for each of the three sensing channels (CH1, CH2, CH3) of the second sensing unit 230b are applied In this case, at the boundary between the first source printed circuit board (S-PCB#1) and the second source printed circuit board (S-PCB#2), three sensing channels (CH(n-) of the first sensing unit 230a 2), CH(n-1), CH(n)) and other channels adjacent to each of the three sensing channels CH1, CH2, and CH3 of the second sensing unit 230b are also lower than the offset values Offset_a and Offset_b. By gradually applying smaller offset values, it is possible to make the boundary more blurry in the direction away from the boundary.

12 is a flowchart of a data compensation method of a display device according to another exemplary embodiment.

Referring to FIG. 12 , in a data compensation method 500 of a display device according to another embodiment, sensing is performed by a sensing unit included in a source driver integrated circuit connected to two or more source printed circuit boards from two or more source printed circuit boards. A step of determining whether or not the plane average values of all sensing data are equal to each other (S510). If the plane average values are not identical to each other, the offset values of all sensing nodes for the two printed circuit boards are respectively calculated using the plane average values. and supplying the sensing data and compensation data that compensates the input data based on the offset values of all sensing nodes for the printed circuit boards to the source driver integrated circuit connected to the printed circuit boards (S520), the plane average values are In the case of the same, the offset values of the sensing nodes of different printed circuit boards are determined by using a line average value of the sensing data for the sensing nodes of the two adjacent printed circuit boards and the adjacent at least two sensing lines, and supplying the sensing data and compensation data obtained by compensating the input data based on the offset values of the sensing nodes to the source driver integrated circuit connected to each printed circuit board associated with the sensing nodes ( S530 ).

For example, in the display device 100 according to the exemplary embodiment described with reference to FIGS. 1 to 12 , the controller integrates the source driver connected to the two printed circuit boards in two or more source printed circuit boards as described above. Since the controller determines the sensed data and the offset value using the sensing unit included in the circuit, and performs steps S510 to S530 using the sensed data and the offset value, a data compensation method 500 for a display device according to another embodiment. ) can be done.

According to the present invention, the block dim phenomenon at the boundary of the source printed circuit boards is reduced by reducing the output deviation of the source printed circuit boards due to the difference in characteristics such as wiring or bonding in the source printed circuit board including the source driver integrated circuits, even though the pixel compensation function is provided has the effect of preventing

The display device 100 according to the above-described embodiment has been described as an organic light emitting display device as an example, but any display device such as a liquid crystal display (LCD) or a plasma display panel (PDP) can be

The above description and the accompanying drawings are merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains can combine configurations within a range that does not depart from the essential characteristics of the present invention. , various modifications and variations such as separation, substitution and alteration will be possible. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: display device 110: display panel
120: data driver 130: gate driver
140: controller 200, 200a, 200b: source driver integrated circuit
210: DAC (Digital Analog Converter)
220, 220a, 220b: ADC (Analog Digital Converter)
230: sensing unit
300: source printed circuit board 400: memory
500: data compensation method

Claims (15)

a display panel on which two or more sub-pixels are disposed;
two or more source printed circuit boards;
two or more source driver integrated circuits having one end connected to each source printed circuit board and the other end connected to the display panel and supplying data voltages to data lines;
a sensing unit included in each of the two or more source driver integrated circuits, the sensing unit sensing voltages of the sensing nodes of the two or more sub-pixels through a sensing line;
ADC (Analog Digital Converter) for converting the voltage of the sensing node from the sensing unit into sensing data in digital form; and
a controller for providing compensation data for compensating input data based on an offset value for compensating for a deviation of the sensed data of the sensing data and the two adjacent source printed circuit boards to the at least two source driver integrated circuits,
The controller is
Each of the offset values of all sensing nodes for the two printed circuit boards is determined by using a plane average value of all the sensed data sensed by the sensing unit included in the source driver integrated circuit connected to the two adjacent printed circuit boards, , supply compensation data obtained by compensating the input data based on the sensing data and the offset values of all sensing nodes for the two printed circuit boards to a source driver integrated circuit connected to the two printed circuit boards,
Determining offset values of the corresponding sensing nodes for the two printed circuit boards by using a line average value of the sensing data for the sensing nodes for the two adjacent printed circuit boards and at least two adjacent sensing lines, A display device for supplying compensation data obtained by compensating the input data based on the sensing data and the offset values of the sensing nodes to a source driver integrated circuit connected to each printed circuit board associated with the sensing nodes. delete According to claim 1,
The controller is
When the first and second surface average values of all sensing data sensed by the sensing unit included in the source driver integrated circuit connected to the two adjacent first and second printed circuit boards are not equal to each other, the first and second Determining first and second offset values of all sensing nodes for the first and second printed circuit boards using the plane average value,
The sensing data and compensation data obtained by compensating the input data based on the first and second offset values of all sensing nodes with respect to the first and second printed circuit boards are connected to the first and second printed circuit boards. A display device that supplies a source driver integrated circuit. 4. The method of claim 3,
The controller is
Determination of offset values of sensing nodes on each printed circuit board by using a plane average value of sensing data for all sensing nodes sensed by a sensing unit included in a source driver integrated circuit connected to the printed circuit boards,
A display device for supplying compensation data obtained by compensating the input data based on the sensing data and offset values of sensing nodes in each printed circuit board to a source driver integrated circuit connected to each printed circuit board. 4. The method of claim 3,
When the number of the printed circuit boards is four or more,
The controller is
The first surface average value of sensing data for the sensing nodes sensed by the sensing unit included in the printed circuit boards located inside, and the sensing node sensed by the sensing unit included in the printed circuit boards located outside Determining the offset values of the sensing nodes using the second and third surface average values obtained by averaging the surface average values of the sensing data for each of the first surface average values again,
A display device for supplying the sensing data and compensation data obtained by compensating the input data based on offset values of sensing nodes of each printed circuit board to a source driver integrated circuit connected to each printed circuit board. The method of claim 1,
The controller is
When the plane average values of the sensing data for the sensing nodes sensed by the sensing unit included in the printed circuit boards are equal to each other, the sensing nodes for the two adjacent printed circuit boards and at least two adjacent sensing lines Determining offset values of corresponding sensing nodes of different printed circuit boards using a line average value of sensing data for
A display device for supplying compensation data obtained by compensating the input data based on the sensing data and offset values of the corresponding sensing nodes to a source driver integrated circuit connected to each printed circuit board associated with the corresponding sensing nodes. 7. The method of claim 6,
The controller is
Determining an offset value of some sensing nodes adjacent to the at least two sensing nodes by reflecting the offset values of the at least two sensing nodes,
A source connected to each printed circuit board related to the some sensing nodes by compensating the input data based on the sensing data and offset values of some sensing nodes adjacent to the at least two sensing nodes in each printed circuit board A display device that supplies a driver integrated circuit. two or more source driver integrated circuits having one end connected to each source printed circuit board among the two or more source printed circuit boards and the other end connected to the display panel and supplying data voltages to data lines;
a sensing unit included in each of the two or more source driver integrated circuits, the sensing unit sensing voltages of the sensing nodes of the two or more sub-pixels through a sensing line; and
and an ADC (Analog Digital Converter) for converting the voltage of the sensing node from the sensing unit into sensing data in digital form,
wherein the at least two source driver integrated circuits receive compensation data for compensating input data based on an offset value for compensating for the sensing data deviation of the sensing data and the two adjacent source printed circuit boards, from the controller;
Offset values of all sensing nodes for the two printed circuit boards, which are determined using a plane average value of all sensing data sensed by a sensing unit included in a source driver integrated circuit connected to two adjacent printed circuit boards, and the The source driver integrated circuit connected to the two printed circuit boards receives the compensation data obtained by compensating the input data based on the sensed data, or
Offset values of the corresponding sensing nodes for the two printed circuit boards respectively determined using a line average value of the sensing data for the sensing nodes for the two adjacent printed circuit boards and at least two adjacent sensing lines, and the A data driver for receiving, by the source driver integrated circuit connected to each printed circuit board associated with the corresponding sensing nodes, compensation data obtained by compensating the input data based on the sensed data. delete 9. The method of claim 8,
When the first and second surface average values of all sensing data sensed by the sensing unit included in the source driver integrated circuit connected to the two adjacent first and second printed circuit boards are not equal to each other, the first and second Compensation data obtained by compensating the input data based on the first and second offset values of all sensing nodes for the first and second printed circuit boards determined using the plane average value and the sensing data, the first and second 2A data driver that the source driver integrated circuit connected to the printed circuit board receives. 11. The method of claim 10,
Offset values of sensing nodes and the sensing data on each printed circuit board determined using a plane average value of sensing data for all sensing nodes sensed by a sensing unit included in a source driver integrated circuit connected to the printed circuit boards. A data driver for receiving, by the source driver integrated circuit connected to each printed circuit board, the compensation data obtained by compensating the input data based on the input data. 11. The method of claim 10,
When the number of the printed circuit boards is four or more,
The first surface average value of sensing data for the sensing nodes sensed by the sensing unit included in the printed circuit boards located inside, and the sensing node sensed by the sensing unit included in the printed circuit boards located outside Compensation for compensating for the input data based on the offset values of the sensing nodes determined using the second and third plane average values obtained by averaging the plane average values of the sensing data for each of the first plane average values again and the sensing data A data driver that receives data, by a source driver integrated circuit connected to each printed circuit board. 9. The method of claim 8,
If the plane average values of the sensing data for the sensing nodes sensed by the sensing unit included in the printed circuit boards are the same, the sensing nodes for the two adjacent printed circuit boards and at least two adjacent sensing lines Offset values of corresponding sensing nodes of different printed circuit boards determined using the line average value of sensing data and compensation data obtained by compensating for the input data based on the sensing data, each printed circuit board associated with the sensing nodes A data driver that the connected source driver integrated circuit receives. 14. The method of claim 13,
The offset values of the at least two sensing nodes determined by reflecting the offset values of some of the sensing nodes adjacent to the at least two sensing nodes and compensation data obtained by compensating the input data based on the sensing data, the some sensing nodes The source driver integrated circuit connected to each printed circuit board associated with the data driver receives. determining whether plane average values of all sensing data sensed by a sensing unit included in a source driver integrated circuit connected to the two printed circuit boards in the two or more source printed circuit boards are not the same;
When the plane average values are not the same, offset values of all sensing nodes for the two printed circuit boards are respectively determined using the plane average values, and all sensing nodes for the sensing data and the printed circuit boards supplying compensation data obtained by compensating the input data based on the offset values of the values to a source driver integrated circuit connected to the printed circuit boards; and
When the plane average values are identical to each other, offset values of corresponding sensing nodes of different printed circuit boards using a line average value of sensing data for sensing nodes of two adjacent printed circuit boards and at least two adjacent sensing lines a display comprising the step of determining the sensing data and supplying compensation data obtained by compensating the input data based on the sensing data and the offset values of the sensing nodes to a source driver integrated circuit connected to each printed circuit board related to the sensing nodes How to compensate the device's data.

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