Pixel sensing circuit and panel driving device

Abstract

The present invention relates to a pixel sensing circuit and a panel driving device, and more particularly, to a pixel sensing circuit and a panel driving device that effectively compensate for differences in characteristics of sensing channel circuits depending on where the sensing channel circuits are arranged in an integrated circuit.

Description

Technical Field

[0001] The invention relates to a pixel sensing circuit and a panel driving device. Background Art

[0002] The display device includes a source driver for driving pixels arranged in a panel.

[0003] The source driver determines a data voltage based on image data, and controls the brightness of each pixel by supplying such a data voltage to the pixel.

[0004] Although the same data voltage is supplied, the brightness of each pixel may be different depending on the characteristic difference between the pixels. For example, the pixel includes a driving transistor. If the threshold voltage of the driving transistor changes, the brightness of the pixel changes despite the same data voltage. If the source driver does not take into account such characteristic differences between pixels, there may be a problem that the pixel is driven with an unexpected brightness and the image quality is reduced.

[0005] Specifically, the characteristics of the pixel may change over time or according to the surrounding environment. In this case, if the source driver supplies the data voltage without considering the changed characteristics of the pixel, there is a problem of reduced image quality (for example, problems such as screen spots occur).

[0006] In order to solve problems such as degradation of image quality, the display device may include a pixel sensing circuit for sensing characteristics of a pixel. In this case, the pixel sensing circuit and the source driver may be mounted on one integrated circuit (IC).

[0007] The pixel sensing circuit may receive an analog signal of each pixel through a sensing line coupled to each pixel. In addition, the pixel sensing circuit may convert the analog signal into pixel sensing data (ie, digital data), and may send the pixel sensing data to the timing controller.

[0008] The timing controller checks the characteristics of each pixel based on the pixel sensing data received from the pixel sensing circuit. In addition, the timing controller can compensate for the characteristic difference between each pixel and other pixels through the adjustment of image data to alleviate the reduction of image quality caused by the characteristic difference between pixels.

[0009] The pixel sensing circuit may include multiple sensing channel circuits to measure many pixels (eg, thousands of pixels or more) arranged in a panel in a short period of time.

[0010] The pixel sensing data may include characteristics of the plurality of sensing channel circuits as well as characteristics of the pixel.

[0011] Therefore, the timing controller needs to compensate for characteristics of a plurality of sensing channel circuits in the pixel sensing data before compensating for characteristics of the pixel based on the pixel sensing data.

[0012] To this end, the timing controller pre-stores characteristic values ​​(or offsets) of the plurality of sensing channel circuits through a process of compensating for the pixel sensing circuit, and compensates for the characteristics of the plurality of sensing channel circuits in the pixel sensing data using the characteristic values.

[0013] In this case, the characteristics of each of the plurality of sensing channel circuits may differ according to the temperature change of the circuit that occurs when the pixel sensing circuit operates. Therefore, a difference may occur between the characteristic value previously stored in the timing controller and the characteristics of the sensing channel circuit that occurs when the pixel sensing circuit operates.

[0014] As described above, in order to properly compensate for the characteristics of the sensing channel circuit that vary in response to temperature variations of the pixel sensing circuit, as in Fig. 9 In FIG. 8 , a reference sense channel circuit 920 is added to one side of the plurality of sense channel circuits 912 , 914 , and 916 .

[0015] The plurality of sensing channel circuits 912, 914 and 916 respectively output a plurality of pixel sensing values ​​using analog signals of the pixels. The reference sensing channel circuit 920 outputs a reference sensing value using a preset reference voltage. In this case, the plurality of pixel sensing values ​​and the reference sensing value may be analog signals.

[0016] The pixel sensing circuit 900 converts multiple pixel sensing values ​​and reference sensing values ​​(i.e., analog signals) into multiple pixel sensing data and reference sensing data (i.e., digital signals) through a multiplexer (MUX) and an analog-to-digital converter (ADC), and sends the multiple pixel sensing data and reference sensing data to a timing controller.

[0017] The timing controller may appropriately compensate for a change in the characteristic of the sensing channel circuit corresponding to a temperature change of the pixel sensing circuit 900 by comparing a previously stored characteristic value of the sensing channel circuit with a characteristic value of a reference sensing channel circuit included in the reference sensing data.

[0018] In this case, in the known pixel sensing circuit 900, the reference sensing channel circuit 920 is arranged only on one side of the plurality of sensing channel circuits 912, 914, and 916, as shown in FIG. Fig. 9 shown.

[0019] However, during the manufacture of the IC, the positions where the plurality of sensing channel circuits 912, 914, and 916 are arranged in the IC may become different. In addition, the temperature change that occurs when the pixel sensing circuit 900 operates may also differ depending on the positions where the plurality of sensing channel circuits 912, 914, and 916 are arranged. Therefore, there is a limitation in improving the sensing accuracy of all the plurality of sensing channel circuits 912, 914, and 916 by only one reference sensing channel circuit 920 arranged on one side of the plurality of sensing channel circuits 912, 914, and 916. Summary of the invention

[0020] In such a background, in one aspect, an object of the present invention is to provide a technique for effectively compensating for a difference in characteristics of a sense channel circuit depending on a position where the sense channel circuit is arranged in an IC.

[0021] To this end, on one hand, the present invention provides a pixel sensing circuit, which is configured to sense characteristics of multiple pixels arranged in a display panel, and the pixel sensing circuit includes: a first sensing channel circuit to an Nth sensing channel circuit, which are arranged in sequence in an integrated circuit board, wherein N is a natural number of 2 or greater; a first reference sensing channel circuit, which is configured to receive a preset reference voltage and output a first reference sensing value, and the first reference sensing channel circuit is arranged adjacent to the first sensing channel circuit in the integrated circuit board; and a Kth reference sensing channel circuit, which is configured to receive the reference voltage and output a Kth reference sensing value, and the Kth reference sensing channel circuit is arranged adjacent to the Nth sensing channel circuit in the integrated circuit board, wherein K is a natural number greater than 1 and less than N.

[0022] The pixel sensing circuit may also include: a second reference sensing channel circuit, which receives the reference voltage and outputs a second reference sensing value, and the second reference sensing channel circuit is arranged adjacent to the Mth sensing channel circuit in the integrated circuit board, where M is a natural number greater than 2 and less than N.

[0023] The pixel sensing circuit may also include: a multiplexer configured to receive the first pixel sensing value to the Nth pixel sensing value output from the first sensing channel circuit to the Nth sensing channel circuit, receive the first reference sensing value and the Kth reference sensing value output from the first reference sensing channel circuit and the Kth reference sensing channel circuit respectively, and sequentially output the first pixel sensing value to the Nth pixel sensing value, the first reference sensing value and the Kth reference sensing value in the order in which the first sensing channel circuit to the Nth sensing channel circuit, the first reference sensing channel circuit and the Kth reference sensing channel circuit are configured in the integrated circuit board; and an analog-to-digital converter configured to receive the first pixel sensing value to the Nth pixel sensing value, the first reference sensing value and the Kth reference sensing value from the multiplexer, and convert the first pixel sensing value to the Nth pixel sensing value, the first reference sensing value and the Kth reference sensing value into the first pixel sensing data to the Nth pixel sensing data, the first reference sensing data and the Kth reference sensing data respectively.

[0024] The first reference sensing channel circuit may be disposed between the first sensing channel circuit and the second sensing channel circuit, and the Kth reference sensing channel circuit may be disposed between the N-1th sensing channel circuit and the Nth sensing channel circuit.

[0025] On the other hand, the present invention provides a panel driving device, including: a pixel sensing circuit, which is configured to generate first pixel sensing values ​​to N-th pixel sensing values ​​for characteristics of multiple pixels arranged in a display panel, convert the first pixel sensing values ​​to the N-th pixel sensing values ​​into first pixel sensing data to N-th pixel sensing data, generate first reference sensing values ​​to K-th reference sensing values ​​for a preset reference voltage, and convert the first reference sensing values ​​to the K-th reference sensing values ​​into first reference sensing data to K-th reference sensing data, wherein N is a natural number of 2 or greater, and K is a natural number greater than 1 and less than N; and a data processing circuit, which is configured to receive the first pixel sensing data to the N-th pixel sensing data and the first reference sensing data to the K-th reference sensing data from the pixel sensing circuit, and use the first reference sensing data to the K-th reference sensing data to compensate the first pixel sensing data to the N-th pixel sensing data.

[0026] The data processing circuit may calculate an average value of the first to K-th reference sensing data and compensate the first to N-th pixel sensing data using the average value.

[0027] The data processing circuit may calculate an average value by multiplying the first reference sensing data to the Kth reference sensing data by preset first to Kth weights, respectively, and averaging their multiplication results, and may use the average value to compensate the first pixel sensing data to the Nth pixel sensing data.

[0028] The pixel sensing circuit may include: a first sensing channel circuit to an Nth sensing channel circuit, which are arranged in sequence in the integrated circuit board and are configured to output the first pixel sensing value to the Nth pixel sensing value respectively; a first reference sensing channel circuit, which is configured to receive the reference voltage and output the first reference sensing value, and the first reference sensing channel circuit is arranged adjacent to the first sensing channel circuit in the integrated circuit board; and a Kth reference sensing channel circuit, which is configured to receive the reference voltage and output the Kth reference sensing value, and the Kth reference sensing channel circuit is arranged adjacent to the Nth sensing channel circuit in the integrated circuit board, wherein K is a natural number greater than 1 and less than N.

[0029] The pixel sensing circuit may also include: a multiplexer configured to receive the first pixel sensing value to the Nth pixel sensing value output from the first sensing channel circuit to the Nth sensing channel circuit, receive the first reference sensing value to the Kth reference sensing value output from the first reference sensing channel circuit to the Kth reference sensing channel circuit, and output the first pixel sensing value to the Nth pixel sensing value and the first reference sensing value to the Kth reference sensing value in sequence according to the configuration order of the first sensing channel circuit to the Nth sensing channel circuit, the first reference sensing channel circuit and the Kth reference sensing channel circuit in the integrated circuit board; and an analog-to-digital converter configured to convert the first pixel sensing value to the Nth pixel sensing value and the first reference sensing value to the Kth reference sensing value into digital values, and send the digital values ​​to the data processing circuit.

[0030] The panel driving device may further include a data driving circuit configured to convert image data into a data voltage and supply the data voltage to a data line, wherein the data processing circuit performs compensation processing on the image data using the first to N-th pixel sensing data.

[0031] As described above, when a pixel sensing circuit is formed in an IC board, two reference sensing channel circuits are arranged at both end sides of a plurality of sensing channel circuits, or one or more reference sensing channel circuits are arranged in the middle or interval of a plurality of sensing channel circuits. Therefore, two or more reference sensing channel circuits can output reference sensing values ​​reflecting circuit characteristics that are different according to the positions where the plurality of sensing channel circuits are arranged, and this makes it possible to improve the sensing accuracy of the entire sensing channel circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The structure of a display device according to the embodiment is shown.

[0033] Figure 2 is a diagram illustrating a structure of a pixel according to an embodiment and signals transmitted and received between the pixel and a data driving circuit and a pixel sensing circuit.

[0034] Figure 3 and Figure 4 The structure of a pixel sensing circuit according to an embodiment is shown.

[0035] Figure 5 is a diagram for describing a structure of a configuration of a pixel sensing circuit according to an embodiment.

[0036] Figure 6 and Figure 7 Other structures of the pixel sensing circuit according to the embodiment are shown.

[0037] Figure 8 A structure of a panel driving device according to an embodiment is shown.

[0038] Fig. 9 The structure of a known pixel sensing circuit is shown. DETAILED DESCRIPTION

[0039] Figure 1 The structure of a display device according to the embodiment is shown.

[0040] refer to Figure 1 , the display device 100 may include a display panel 110 and panel driving circuits 120 , 130 , 140 and 150 for driving the display panel 110 .

[0041] A plurality of data lines DL, a plurality of gate lines GL, and a plurality of sensing lines SL are arranged in the display panel 110 , and a plurality of pixels P may also be arranged in the display panel 110 .

[0042] The circuits 120, 130, 140, and 150 for driving at least one element included in the display panel 110 may be referred to as a panel driving circuit. For example, the data driving circuit 120, the pixel sensing circuit 130, the gate driving circuit 140, and the data processing circuit 150 may be referred to as a panel driving circuit.

[0043] In the panel driving circuit, the gate driving circuit 140 may supply a scanning signal (such as an on voltage or an off voltage, etc.) to the gate line GL. When the scanning signal of the on voltage is supplied to the pixel P, the corresponding pixel P is connected to the data line DL, and when the scanning signal of the off voltage is supplied to the pixel P, the pixel P is disconnected from the data line DL.

[0044] In the panel driving circuit, the data driving circuit 120 supplies data voltages to the data lines DL. The data voltages supplied to the data lines DL are transmitted to the pixels P connected to the data lines DL according to the scan signals of the gate driving circuit 140.

[0045] In the panel driving circuit, the pixel sensing circuit 130 receives an analog signal (eg, voltage or current) formed in each pixel P. The pixel sensing circuit 130 may be connected to each pixel P in response to a scan signal or a separate sensing signal. Here, the separate sensing signal may be generated by the gate driving circuit 140 .

[0046] In the panel driving circuit, the data processing circuit 150 may supply various control signals to the gate driving circuit 140 and the data driving circuit 120. The data processing circuit 150 may generate a gate control signal GCS for starting scanning according to the timing of each frame and transmit the gate control signal GCS to the gate driving circuit 140.

[0047] The data processing circuit 150 may convert image data input from an external device into image data RGB in a data format used in the data driving circuit 120, and transmit the converted image data RGB to the data driving circuit 120. In addition, the data processing circuit 150 may transmit a data control signal DCS that controls the data driving circuit 120 to supply a data voltage to each pixel P at an appropriate timing.

[0048] The data processing circuit 150 may compensate the image data RGB based on the characteristics of each pixel P and transmit the compensated image data. At this time, the data processing circuit 150 may receive sensing data S_DATA from the pixel sensing circuit 130. Here, the sensing data S_DATA may include a measured value of the characteristic of the pixel P.

[0049] On the other hand, the data driving circuit 120 may be referred to as a source driver, the gate driving circuit 140 may be referred to as a gate driver, and the data processing circuit 150 may be referred to as a timing controller.

[0050] The data driving circuit 120 and the pixel sensing circuit 130 may be included in one integrated circuit (IC) 125 and referred to as a source driver IC.

[0051] In addition, the data driving circuit 120, the pixel sensing circuit 130, and the data processing circuit 150 may be included in one IC and referred to as a unified IC. Although the present invention is not limited to such a name, descriptions of some well-known elements such as a source driver, a gate driver, a timing controller, etc. will be omitted in the description of the following embodiments. Therefore, the description of the embodiments should be understood in consideration of the fact that descriptions of some such elements are omitted.

[0052] The display panel 110 may be an organic light emitting display panel. In this case, each pixel P arranged in the display panel 110 may include an organic light emitting diode (OLED) and one or more transistors. The characteristics of the OLED and one or more transistors included in each pixel P may change over time or according to the surrounding environment. The pixel sensing circuit 130 according to the embodiment may sense the characteristics of such elements included in each pixel P and send them to the data processing circuit 150.

[0053] Figure 2 is a diagram illustrating a structure of a pixel according to an embodiment and signals transmitted and received between the pixel and a data driving circuit and a pixel sensing circuit.

[0054] refer to Figure 2 The pixel P may include an organic light emitting diode OLED, a driving transistor DRT, a switching transistor SWT, a sensing transistor SENT, a storage capacitor Cstg, and the like.

[0055] The OLED may include an anode electrode, an organic layer, a cathode electrode, etc. According to the control of the driving transistor DRT, the anode electrode is connected to the driving voltage EVDD, and the cathode electrode is connected to the base voltage EVSS, so that the OLED emits light.

[0056] The driving transistor DRT may control the brightness of the OLED by controlling a driving current supplied to the OLED.

[0057] The first node N1 of the driving transistor DRT may be electrically connected to the anode of the OLED. The first node N1 may be a source node or a drain node.

[0058] The second node N2 of the driving transistor DRT may be electrically connected to a source node or a drain node of the switching transistor SWT. The second node N2 may be a gate node.

[0059] The third node N3 of the driving transistor DRT may be electrically connected to a driving voltage line DVL through which the driving voltage EVDD is supplied. The third node N3 may be a drain node or a source node.

[0060] The switching transistor SWT may be electrically connected between the data line DL and the second node N2 of the driving transistor DRT and be turned on by a scan signal supplied from the gate lines GL1 and GL2 .

[0061] When the switching transistor SWT is turned on, the data voltage Vdata supplied from the data driving circuit 120 through the data line DL is transmitted to the second node N2 of the driving transistor DRT.

[0062] The storage capacitor Cstg may be electrically connected between the first node N1 and the second node N2 of the driving transistor DRT. The storage capacitor Cstg may be a parasitic capacitor existing between the first node N1 and the second node N2 of the driving transistor DRT or an external capacitor intentionally disposed outside the driving transistor DRT.

[0063] The sensing transistor SENT may connect the first node N1 of the driving transistor DRT and the sensing line SL.

[0064] The sensing line SL may transmit a reference voltage Vref to the first node N1 and transmit an analog signal (eg, voltage or current) formed in the first node N1 to the pixel sensing circuit 130 .

[0065] The pixel sensing circuit 130 measures characteristics of the pixel P using an analog signal Vsense or Isense transmitted through the sensing line SL.

[0066] When measuring the voltage of the first node N1, the threshold voltage, mobility, current characteristics, etc. of the driving transistor DRT can be checked. In addition, when measuring the voltage of the first node N1, the degree of degradation of the OLED, such as parasitic capacitance, current characteristics, etc. of the OLED, can be checked.

[0067] In addition, when the current transmitted to the first node N1 via the driving transistor DRT is measured, the current capability of the driving transistor DRT may be measured. When the current flowing into the OLED via the first node N1 is measured, the current characteristics of the OLED may be measured.

[0068] The pixel sensing circuit 130 can measure the current transmitted from or to the first node N1 and transmit the pixel sensing data (ie, the digital signal of the measured value) to the data processing circuit (refer to Figure 1 150). Data processing circuit (reference Figure 1 The pixel sensing circuit 130 of FIG. 150 can identify the characteristics of each pixel P by analyzing the pixel sensing data. The pixel sensing circuit 130 having the above structure may include a plurality of sensing channel circuits, that is, Figure 3 The first sensing channel circuit 312 to the Nth (N is a natural number of 2 or greater) sensing channel circuit 316 are shown to measure characteristics of a plurality of pixels P.

[0069] The first sensing channel circuit 312 to the Nth sensing channel circuit 316 may be sequentially arranged in an IC board to form an IC. Here, due to differences obtained during manufacturing, surrounding environment, etc., the first sensing channel circuit 312 to the Nth sensing channel circuit 316 may have different circuit characteristics depending on the positions where the first sensing channel circuit 312 to the Nth sensing channel circuit 316 are arranged, and this may cause differences in measurement results.

[0070] In an embodiment, in order to effectively compensate for the difference in measurement depending on the location where the first sensing channel circuit 312 to the Nth sensing channel circuit 316 are arranged, one reference sensing channel circuit can be arranged adjacent to the first sensing channel circuit 312 and another reference sensing channel circuit can be arranged adjacent to the Nth sensing channel circuit 316.

[0071] In other words, in an embodiment, the pixel sensing circuit 130 may include a first sensing channel circuit 312 to an Nth sensing channel circuit 316 sequentially arranged in the IC board, and may also include a first reference sensing channel circuit 322 arranged adjacent to the first sensing channel circuit 312 and a Kth (K is a natural number greater than 1 and less than N) reference sensing channel circuit 324 arranged adjacent to the Nth sensing channel circuit 316, as shown in FIG. Figure 3 Here, the first reference sensing channel circuit 322 may be a circuit configured to receive a preset reference voltage and output a first reference sensing value, and the Kth reference sensing channel circuit 324 may be a circuit configured to receive a preset reference voltage and output a Kth reference sensing value.

[0072] When the first to N-th sensing channel circuits 312 to 316 are formed in an IC board during an IC manufacturing process, the first reference sensing channel circuit 322 and the K-th reference sensing channel circuit 324 may be formed simultaneously. Figure 4 As shown, the pixel sensing circuit 130 may further include a second reference sensing channel circuit 326 disposed adjacent to the Mth (M is a natural number greater than 2 and less than N) sensing channel circuit 314 .

[0073] In other words, if Figure 5 As shown in FIG. 5A , the pixel sensing circuit 130 may include reference sensing channel circuits REF#1 and REF#k respectively arranged at both ends of a plurality of sensing channel circuits SEN#1 to SEN#n. In this case, Figure 5 In 5A, k can be 2.

[0074] like Figure 5 As shown in FIG. 5B , the reference sensing channel circuits REF#1 and REF#k can be respectively arranged at both ends of the plurality of sensing channel circuits SEN#1 to SEN#n, and the reference sensing channel circuit REF#2 can also be arranged in the middle of the plurality of sensing channel circuits SEN#1 to SEN#n. In this case, Figure 5 In 5B, k can be 3. Figure 5 As shown in FIG5C , reference sensing channel circuits REF#1 and REF#k may be disposed at both ends of a plurality of sensing channel circuits SEN#1 to SEN#n, respectively, and one or more reference sensing channel circuits (e.g., REF#2 and REF#3) may also be disposed between every two adjacent sensing channel circuits SEN#1 to SEN#n. In this case, Figure 5 In 5C, k can be a natural number greater than 3 and less than n.

[0075] In addition, if Figure 5 As shown in FIG5D , the first reference sensing channel circuit REF#1 may be arranged between the first sensing channel circuit SEN#1 and the second sensing channel circuit SEN#2, and the Kth reference sensing channel circuit REF#k may be arranged between the (N-1)th sensing channel circuit SEN#n-1 and the Nth sensing channel circuit SEN#n. In this case, Figure 5 In 5D, k may be 2 or 3 or a natural number greater than 3 and less than n.

[0076] As described above, when the pixel sensing circuit 130 is formed in the IC board, two reference sensing channel circuits are arranged on both sides of the plurality of sensing channel circuits SEN#1 to SEN#n, respectively, or one or more reference sensing channel circuits are arranged in the middle or interval of the plurality of sensing channel circuits SEN#1 to SEN#n. Therefore, different circuit characteristics depending on the positions where the plurality of sensing channel circuits SEN#1 to SEN#n are arranged can be reflected in the two or more reference sensing channel circuits.

[0077] In other words, by arranging two or more reference sensing channel circuits to be dispersed among multiple sensing channel circuits SEN#1 to SEN#n, all circuit characteristics of the sensing channel circuits that are different according to the positions where the multiple sensing channel circuits SEN#1 to SEN#n are arranged can be reflected in the two or more reference sensing channel circuits.

[0078] In an embodiment, the pixel sensing circuit 130 may further include a multiplexer (MUX) configured to receive the first pixel sensing value to the Nth pixel sensing value outputted from the first sensing channel circuit 312 to the Nth sensing channel circuit 316, respectively, receive the first reference sensing value and the Kth reference sensing value outputted from the first reference sensing channel circuit 322 and the Kth reference sensing channel circuit 324, respectively, and sequentially output the first pixel sensing value to the Nth pixel sensing value and the first reference sensing value to the Kth reference sensing value in the order of circuit configuration. Here, the circuit configuration order may refer to the order in which the first sensing channel circuit 312 to the Nth sensing channel circuit 316 and the first reference sensing channel circuit 322 to the Kth reference sensing channel circuit 324 are configured in the IC board.

[0079] The pixel sensing circuit 130 may further include an analog-to-digital converter (ADC) configured to receive the first pixel sensing value to the Nth pixel sensing value and the first reference sensing value to the Kth reference sensing value from the MUX, and convert the first pixel sensing value to the Nth pixel sensing value and the first reference sensing value to the Kth reference sensing value into the first pixel sensing data to the Nth pixel sensing data and the first reference sensing data to the Kth reference sensing data, respectively. Here, the first pixel sensing value to the Nth pixel sensing value and the first reference sensing value to the Kth reference sensing value may be analog signals. The first pixel sensing data to the Nth pixel sensing data and the first reference sensing data to the Kth reference sensing data may be digital signals.

[0080] The pixel sensing circuit 130 may further include a sample-and-hold circuit (S / H) disposed between the MUX and each of the first to Nth sensing channel circuits 312 to 316. Here, the sample-and-hold circuit S / H may receive the first to Nth pixel sensing values ​​outputted from the first to Nth sensing channel circuits 312 to 316, respectively, maintain the received pixel sensing values ​​for a predetermined time, and output the pixel sensing values ​​to the MUX.

[0081] In the above, for the convenience of description, a circuit for measuring the characteristics of a pixel P using the current Isense received through the sensing line SL is mainly described. However, the embodiment can also be applied to Figure 6 A circuit for measuring the characteristics of a pixel P using a voltage Vsense as shown, or a circuit for measuring the characteristics of a pixel P using a voltage Vsense as shown Figure 7The circuit shown measures the characteristics of the pixel P by selectively using the current Isense or the voltage Vsense.

[0082] Hereinafter, a panel driving device including the pixel sensing circuit 130 is described.

[0083] Figure 8 A structure of a panel driving device according to an embodiment is shown.

[0084] refer to Figure 8 The panel driving device may include a display panel 110 , a pixel sensing circuit 130 , and a data processing circuit 150 . The panel driving device may further include a data driving circuit 120 .

[0085] The pixel sensing circuit 130 may generate first to N-th pixel sensing values ​​for characteristics of pixels arranged in the display panel 110. To this end, the pixel sensing circuit 130 may include a plurality of sensing channel circuits SEN#1 to SEN#n sequentially arranged in an IC board, that is, a first sensing channel circuit 312 (SEN#1) to an N-th sensing channel circuit 316 (SEN#n).

[0086] The pixel sensing circuit 130 may generate first to K-th reference sensing values ​​for a preset reference voltage. To this end, the pixel sensing circuit 130 may include a first reference sensing channel circuit 322 (REF#1) disposed adjacent to the first sensing channel circuit 312 (SEN#1) in the IC board and a K-th reference sensing channel circuit 324 (REF#k) disposed adjacent to the N-th sensing channel circuit 316 (SEN#n) in the IC board.

[0087] The pixel sensing circuit 130 may further include a second reference sensing channel circuit 326 (REF#2) arranged adjacent to the Mth sensing channel circuit 314. In other words, the pixel sensing circuit 130 may further include one or more reference sensing channel circuits arranged in the middle or interval of the plurality of sensing channel circuits SEN#1 to SEN#n. As described above, the pixel sensing circuit 130 may generate first pixel sensing values ​​to Nth pixel sensing values ​​and first reference sensing values ​​to Kth reference sensing values, convert the first pixel sensing values ​​to Nth pixel sensing values ​​into first pixel sensing data to Nth pixel sensing data, respectively, convert the first reference sensing values ​​to Kth reference sensing values ​​into first reference sensing data to Kth reference sensing data, respectively, and send the first pixel sensing data to Nth pixel sensing data and the first reference sensing data to Kth reference sensing data to the data processing circuit 150. Here, the first pixel sensing values ​​to Nth pixel sensing values ​​and the first reference sensing values ​​to Kth reference sensing values ​​may be analog signals. The first pixel sensing data to Nth pixel sensing data and the first reference sensing data to Kth reference sensing data may be digital signals.

[0088] In an embodiment, the first reference sensing data may be sensing data reflecting characteristics of a sensing channel circuit (including the first sensing channel circuit) arranged adjacent to the first reference sensing channel circuit 322 (REF#1), and the Kth reference sensing data may be sensing data reflecting characteristics of a sensing channel circuit (including the Nth sensing channel circuit) arranged adjacent to the Kth reference sensing channel circuit 324 (REF#k).

[0089] The data processing circuit 150 may receive the first to N-th pixel sensing data and the first to K-th reference sensing data from the pixel sensing circuit 130 , and compensate the first to N-th pixel sensing data using the first to K-th reference sensing data.

[0090] Here, the data processing circuit 150 may calculate an average value of the first reference sensing data and the Kth reference sensing data.

[0091] The data processing circuit 150 may compensate the first pixel sensing data to the Nth pixel sensing data using the average value. In addition, the data processing circuit 150 may calculate the average value by multiplying the first reference sensing data to the Kth reference sensing data by the preset first weight to the Kth weight and averaging their multiplication results. Here, the characteristics of the manufacturing process of the IC 125 may be reflected in the first weight to the Kth weight.

[0092] The data processing circuit 150 may compensate the first to N-th pixel sensing data using the average value calculated as described above.

[0093] The data processing circuit 150 may perform compensation processing on the image data RGB using the first to N-th pixel sensing data compensated as described above.

[0094] The data driving circuit 120 may convert the compensation-processed image data RGB into a data voltage in the data processing circuit 150 and supply the data voltage to the data line.

[0095] As described above, according to the present invention, when the pixel sensing circuit 130 is formed in the IC board, two reference sensing channel circuits can be arranged at both end sides of the plurality of sensing channel circuits, respectively, or one or more reference sensing channel circuits can be arranged in the middle or interval of the plurality of sensing channel circuits. Therefore, the two or more reference sensing channel circuits can output reference sensing values ​​reflecting circuit characteristics that are different according to the positions where the plurality of sensing channel circuits are arranged, and this makes it possible to improve the sensing accuracy of the entire sensing channel circuit.

[0096] CROSS-REFERENCE TO RELATED APPLICATIONS

[0097] This application claims priority to Korean Patent Application No. 10-2020-0024704, filed on February 28, 2020, which is hereby incorporated by reference in its entirety for all purposes as if fully set forth herein.

Claims

1. A pixel sensing circuit configured to sense characteristics of a plurality of pixels arranged in a display panel, the pixel sensing circuit comprising: A first sensing channel circuit to an Nth sensing channel circuit are sequentially arranged in an integrated circuit board, wherein N is a natural number of 2 or greater; a first reference sensing channel circuit configured to receive a preset reference voltage and output a first reference sensing value, and the first reference sensing channel circuit is arranged adjacent to the first sensing channel circuit in the integrated circuit board; as well as a Kth reference sensing channel circuit, configured to receive the reference voltage and output a Kth reference sensing value, the Kth reference sensing channel circuit being arranged adjacent to the Nth sensing channel circuit in the integrated circuit board, wherein K is a natural number greater than 1 and less than N, The reference sensing value outputted from the reference sensing channel circuit is used to compensate the first pixel sensing value to the Nth pixel sensing value outputted from the first sensing channel circuit to the Nth sensing channel circuit.

2. The pixel sensing circuit according to claim 1 , further comprising: A second reference sensing channel circuit receives the reference voltage and outputs a second reference sensing value, and the second reference sensing channel circuit is arranged adjacent to the Mth sensing channel circuit in the integrated circuit board, where M is a natural number greater than 2 and less than N.

3. The pixel sensing circuit according to claim 1 , further comprising: a multiplexer configured to receive the first pixel sensing value to the Nth pixel sensing value outputted from the first sensing channel circuit to the Nth sensing channel circuit, receive the first reference sensing value and the Kth reference sensing value respectively outputted from the first reference sensing channel circuit and the Kth reference sensing channel circuit, and sequentially output the first pixel sensing value to the Nth pixel sensing value, the first reference sensing value, and the Kth reference sensing value according to the configuration order of the first sensing channel circuit to the Nth sensing channel circuit, the first reference sensing channel circuit, and the Kth reference sensing channel circuit in the integrated circuit board; as well as an analog-to-digital converter configured to receive the first pixel sensing value to the N-th pixel sensing value, the first reference sensing value, and the K-th reference sensing value from the multiplexer, and convert the first pixel sensing value to the N-th pixel sensing value, the first reference sensing value, and the K-th reference sensing value into first pixel sensing data to the N-th pixel sensing data, the first reference sensing data, and the K-th reference sensing data, respectively.

4. The pixel sensing circuit according to claim 1, wherein: The first reference sensing channel circuit is arranged between the first sensing channel circuit and the second sensing channel circuit, and the Kth reference sensing channel circuit is arranged between the N-1th sensing channel circuit and the Nth sensing channel circuit.

5. A panel driving device, comprising: a pixel sensing circuit configured to generate first to N-th pixel sensing values ​​for characteristics of a plurality of pixels arranged in a display panel, convert the first to N-th pixel sensing values ​​into first to N-th pixel sensing data, generate first to K-th reference sensing values ​​for a preset reference voltage, and convert the first to K-th reference sensing values ​​into first to K-th reference sensing data, wherein N is a natural number of 2 or more, and K is a natural number greater than 1 and less than N; as well as a data processing circuit configured to receive the first to the N-th pixel sensing data and the first to the K-th reference sensing data from the pixel sensing circuit, and to compensate the first to the N-th pixel sensing data using the first to the K-th reference sensing data, The two reference sensing channel circuits are respectively arranged at both end sides of the plurality of sensing channel circuits, or one or more reference sensing channel circuits are further arranged in the middle or interval of the plurality of sensing channel circuits.

6. The panel driving device according to claim 5, wherein: The data processing circuit calculates an average value of the first to K-th reference sensing data and compensates the first to N-th pixel sensing data using the average value.

7. The panel driving device according to claim 5, wherein: The data processing circuit calculates an average value by multiplying the first to K-th reference sensing data by preset first to K-th weights, respectively, and averaging their multiplication results, and compensates the first to N-th pixel sensing data using the average value.

8. The panel driving device according to claim 5, wherein: The pixel sensing circuit comprises: A first sensing channel circuit to an Nth sensing channel circuit, which are sequentially arranged in the integrated circuit board and configured to output the first pixel sensing value to the Nth pixel sensing value respectively; a first reference sensing channel circuit configured to receive the reference voltage and output the first reference sensing value, the first reference sensing channel circuit being arranged adjacent to the first sensing channel circuit in the integrated circuit board; and The Kth reference sensing channel circuit is configured to receive the reference voltage and output the Kth reference sensing value, and the Kth reference sensing channel circuit is arranged adjacent to the Nth sensing channel circuit in the integrated circuit board, wherein K is a natural number greater than 1 and less than N.

9. The panel driving device according to claim 8, wherein: The pixel sensing circuit further includes: a multiplexer configured to receive the first pixel sensing value to the Nth pixel sensing value outputted from the first sensing channel circuit to the Nth sensing channel circuit, receive the first reference sensing value to the Kth reference sensing value outputted from the first reference sensing channel circuit to the Kth reference sensing channel circuit, respectively, and sequentially output the first pixel sensing value to the Nth pixel sensing value and the first reference sensing value to the Kth reference sensing value according to the configuration order of the first sensing channel circuit to the Nth sensing channel circuit, the first reference sensing channel circuit, and the Kth reference sensing channel circuit in the integrated circuit board; and An analog-to-digital converter is configured to convert the first pixel sensing value to the Nth pixel sensing value and the first reference sensing value to the Kth reference sensing value into digital values ​​and send the digital values ​​to the data processing circuit.

10. The panel driving device according to claim 5, further comprising: a data driving circuit configured to convert image data into a data voltage and supply the data voltage to the data line, The data processing circuit uses the first pixel sensing data to the Nth pixel sensing data to perform compensation processing on the image data.

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