Display device, driving method thereof, and electronic device including display device

Abstract

A display device according to embodiments of the present invention includes: a pixel unit having pixels connected to a first power line, a second power line, scan lines, and data lines; a sensing resistor positioned between the first power line and the pixel unit; a voltage / current sensing unit for measuring a sensing voltage from the sensing resistor during a correction period; a timing control unit for generating a voltage code on the basis of input data; and a power-generating unit for supplying a voltage of a first driving power source to the first power line in response to the voltage code, wherein the timing control unit generates a compensation LUT such that a target voltage corresponding to the voltage code matches the sensing voltage during the correction period.

Description

Display device and its driving method, and electronic device including the display device

[0001] The present invention relates to a display device and a driving method thereof, and an electronic device including the display device.

[0002] As information technology advances, the importance of display devices, which serve as a link between users and information, is growing. In response, the use of display devices such as liquid crystal displays (LCDs) and organic light-emitting display devices (OLEDs) is increasing.

[0003] A display device displays an image using a plurality of pixels. The pixels can generate light of a predetermined brightness by controlling the amount of current flowing from a first driving power source to a second driving power source in response to a data signal.

[0004] The voltage of the first driving power supply can be changed in response to the load of the pixel unit containing the pixels so as to minimize or reduce power consumption. In order for the pixels to display an image of the desired brightness, the first driving power supply must maintain the target voltage (or, set voltage, target voltage).

[0005] An object of the present invention is to provide a display device and a driving method thereof, which enable a first driving power source to maintain a target voltage regardless of the tolerance of circuits for generating power, and an electronic device including the display device.

[0006] A display device according to embodiments of the present invention comprises: a pixel unit including pixels connected to a first power line, a second power line, scan lines, and data lines; a sensing resistor positioned between the first power line and the pixel unit; a voltage / current sensing unit for measuring a sensing voltage from the sensing resistor during a compensation period; a timing control unit for generating a voltage code based on input data; and a power generation unit for supplying a voltage of a first driving power source to the first power line in response to the voltage code; and the timing control unit generates a compensation LUT such that a target voltage corresponding to the voltage code and the sensing voltage are matched during the compensation period.

[0007] According to an embodiment, the timing control unit generates a compensation LUT corresponding to a first voltage code of minimum load, a second voltage code of medium load, and a third voltage code of maximum load.

[0008] According to an embodiment, the timing control unit interpolates the first voltage code, the second voltage code, and the third voltage code to generate a compensation LUT corresponding to the remaining load and the remaining voltage codes.

[0009] According to an embodiment, the first voltage code corresponds to the lowest grayscale, the second voltage code corresponds to the middle grayscale, and the third voltage code corresponds to the highest grayscale.

[0010] In an embodiment, the correction period is located at the point in time when power is supplied to the display device, or at the point in time when power is supplied to the display device after the usage time of the display device exceeds a preset threshold value.

[0011] According to the embodiment, the voltage / current sensing unit measures the sensing current from the sensing resistor other than the compensation period.

[0012] According to an embodiment, the power generation unit comprises an analog-to-digital converter that generates a reference voltage using the voltage code; and a DC-DC converter that generates the first driving power based on the reference voltage.

[0013] According to an embodiment, the timing control unit comprises an analysis unit for calculating a load from the input data and extracting a peak grayscale; a code value generation unit for generating the voltage code corresponding to the load and peak grayscale; and a voltage adjustment unit for generating the compensation LUT using an offset corresponding to a difference between the sensing voltage and the target voltage.

[0014] According to an embodiment, the timing control unit further includes a sensing control unit that controls the voltage / current sensing unit so that the sensing voltage is measured during the correction period, and that controls the voltage / current sensing unit so that the sensing current is measured during a period other than the correction period.

[0015] According to an embodiment, the analysis unit includes a load analysis unit for calculating a load from the input data; and a grayscale analysis unit for extracting a peak grayscale from the input data.

[0016] According to an embodiment, the voltage adjustment unit extracts a target voltage corresponding to the voltage code from a target LUT, and includes a voltage error determination unit for generating an offset corresponding to a difference between the sensing voltage and the target voltage; and a compensation LUT generation unit for generating a compensation LUT by applying the offset to a reference LUT in which a target voltage corresponding to the voltage code is stored.

[0017] In an embodiment, the target LUT is the same LUT as the reference LUT.

[0018] According to an embodiment, the voltage error determination unit generates a negative value offset when the sensing voltage is higher than the target voltage, and generates a positive value offset when the sensing voltage is lower than the target voltage.

[0019] According to the embodiment, the voltage error determination unit generates a value of “0” as an offset when the sensing voltage is equal to the target voltage.

[0020] According to an embodiment, the code value generation unit generates the voltage code using the compensation LUT during a period excluding the correction period.

[0021] The method for driving a display device according to embodiments of the present invention comprises the steps of: generating a voltage of a first driving power supply corresponding to a voltage code during a compensation period; measuring the voltage of the first driving power supply to generate a sensing voltage; comparing the target voltage corresponding to the voltage code with the sensing voltage to generate an offset; and generating a compensation LUT using the offset.

[0022] In an embodiment, the offset is generated so that the sensing voltage becomes equal to the target voltage.

[0023] According to an embodiment, the voltage code is generated using the compensation LUT during a period excluding the correction period.

[0024] In an embodiment, the compensation LUT is generated corresponding to the first voltage code of the minimum load, the second voltage code of the medium load, and the third voltage code of the maximum load during the compensation period.

[0025] According to an embodiment, the method further includes a step of interpolating the first voltage code, the second voltage code, and the third voltage code to generate a compensation LUT corresponding to the remaining loads and the remaining codes.

[0026] According to an embodiment, the first voltage code corresponds to the lowest grayscale, the second voltage code corresponds to the middle grayscale, and the third voltage code corresponds to the highest grayscale.

[0027] In an embodiment, the correction period is located at the point in time when power is supplied to the display device, or at the point in time when power is supplied to the display device after the usage time of the display device exceeds a preset threshold value.

[0028] In the step of generating the offset according to the embodiment, a negative value offset is generated when the sensing voltage is higher than the target voltage, and a positive value offset is generated when the sensing voltage is lower than the target voltage.

[0029] An electronic device according to embodiments of the present invention comprises: a display panel including pixels; a voltage generation circuit for supplying a voltage of a first driving power source to the display panel based on a voltage code; a current / voltage sensing unit for measuring a voltage of the first driving power source supplied to the display panel during a compensation period to generate a sensing voltage; and a controller for generating the voltage code based on input data; wherein the controller generates a compensation LUT so that a target voltage corresponding to the voltage code and the sensing voltage are matched during the compensation period.

[0030] In an embodiment, the controller generates the compensation LUT corresponding to a first voltage code of minimum load, a second voltage code of medium load, and a third voltage code of maximum load; and interpolates the first voltage code, the second voltage code, and the third voltage code to generate the compensation LUT corresponding to the remaining loads and the remaining codes.

[0031] According to an embodiment, the controller generates the voltage code using the compensation LUT during a period excluding the correction period.

[0032] The tasks of the present invention are not limited to the tasks mentioned above, and other technical tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0033] According to the display device and its driving method according to embodiments of the present invention, and the electronic device including the display device, the first driving power can be set to a target voltage regardless of the tolerance of the circuits, thereby ensuring driving reliability.

[0034] However, the effects of the present invention are not limited to the above-described effects, and may be expanded in various ways without departing from the spirit and scope of the present invention.

[0035] FIG. 1 is a drawing showing a display device according to one embodiment of the present invention.

[0036] FIG. 2 is a drawing showing one embodiment of the pixel illustrated in FIG. 1 according to one embodiment of the present invention.

[0037] FIG. 3 is a drawing showing a power generation unit according to one embodiment of the present invention.

[0038] FIG. 4 is a diagram showing the voltage of a first driving power supply corresponding to a voltage code according to one embodiment of the present invention.

[0039] FIG. 5 is a diagram showing power consumption corresponding to the load of a pixel unit according to one embodiment of the present invention.

[0040] Fig. 6 is a drawing showing a timing control unit according to one embodiment of the present invention.

[0041] FIG. 7a and FIG. 7b are diagrams illustrating a method for generating a compensation LUT when a sensing voltage is higher than a target voltage according to one embodiment of the present invention.

[0042] FIG. 8A and FIG. 8B are diagrams illustrating a method for generating a compensation LUT when a sensing voltage is lower than a target voltage according to one embodiment of the present invention.

[0043] FIG. 9a and FIG. 9b are diagrams illustrating a compensation LUT generation method when a target voltage and a sensing voltage are the same according to one embodiment of the present invention.

[0044] FIG. 10a and FIG. 10b are diagrams showing a compensation LUT generation method according to an embodiment of the present invention.

[0045] FIG. 11a and FIG. 11b are diagrams showing compensation voltages when the offset is 0 corresponding to the first to third voltage codes according to one embodiment of the present invention.

[0046] FIG. 12a and FIG. 12b are diagrams showing compensation voltages when the offset has a positive value corresponding to the first voltage code to the third voltage code according to one embodiment of the present invention.

[0047] FIG. 13a and FIG. 13b are diagrams showing compensation voltages when the offset has a negative value corresponding to the first voltage code to the third voltage code according to one embodiment of the present invention.

[0048] Fig. 14 is a diagram showing power consumption corresponding to the load of a pixel unit according to one embodiment of the present invention.

[0049] FIG. 15 is a drawing showing an electronic device according to one embodiment of the present invention.

[0050] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0051] To clearly explain the present invention, irrelevant parts have been omitted, and the same reference numerals are used to designate identical or similar components throughout the specification. Accordingly, the reference numerals described above may also be used in other drawings.

[0052] Additionally, the sizes and thicknesses of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to what is shown. In order to clearly express multiple layers and regions in the drawings, the thicknesses may be exaggerated.

[0053] Additionally, the expression "same" in the description may mean "substantially the same." That is, it may be a degree of similarity that would be acceptable to a person of ordinary skill. Other expressions may also omit the word "substantially."

[0054] Some embodiments are described in the accompanying drawings with respect to functional blocks, units, and / or modules. Those skilled in the art will appreciate that these blocks, units, and / or modules are physically implemented by logic circuits, discrete components, microprocessors, hard-wired circuits, memory elements, wiring connections, and other electronic circuits. These may be formed using semiconductor-based manufacturing techniques or other manufacturing techniques. For blocks, units, and / or modules implemented by microprocessors or other similar hardware, they may be programmed and controlled using software to perform various functions discussed in the present invention, and may optionally be driven by firmware and / or software. Furthermore, each block, unit, and / or module may be implemented by dedicated hardware, or may be implemented by a combination of dedicated hardware performing some functions and processors (e.g., one or more programmed microprocessors and associated circuits) performing other functions. Furthermore, in some embodiments, the blocks, units, and / or modules may be physically separated into two or more individual blocks, units, and / or modules that interact with each other without departing from the scope of the inventive concept. Additionally, in some embodiments, blocks, units and / or modules may be combined into physically more complex blocks, units and / or modules without departing from the scope of the present invention.

[0055] The term "connection" between two components may encompass both electrical and physical connections, but is not necessarily limited to this. For example, "connection" used in a schematic diagram may imply an electrical connection, while "connection" used in a cross-section or plan view may imply a physical connection.

[0056] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are merely used to distinguish one component from another. Therefore, it should be understood that a "first" component referred to below may also be a "second" component within the technical scope of the present invention.

[0057] Meanwhile, the present invention is not limited to the embodiments disclosed below, and may be implemented in various modified forms. Furthermore, each embodiment disclosed below may be implemented independently or in combination with at least one other embodiment.

[0058] FIG. 1 is a drawing showing a display device according to one embodiment of the present invention.

[0059] Referring to FIG. 1, a display device (100) according to one embodiment of the present invention may include a pixel unit (110) (or display panel), a scan driver (120), a data driver (130), a timing controller (140), a power generator (150), and a voltage / current sensing unit (160). The scan driver (120), the data driver (130), the timing controller (140), the power generator (150), and the voltage / current sensing unit (160) may constitute a driving device that drives the pixel unit (110).

[0060] The pixel unit (110) can display images. The pixel unit (110) can have pixels (PX) connected to first scan lines (SL1, ..., SLi, ..., SLn), second scan lines (SSL1, ..., SSLi, ..., SSLn), data lines (DL1, ..., DLj, ..., DLm), and lead-out lines (RL1, ..., RLj, ..., RLm) (wherein, n and m are natural numbers greater than or equal to 3).

[0061] A pixel (PX) may be connected to one of the first scan lines (SL1 to SLn) and one of the data lines (DL1 to DLm). Additionally, the pixel (PX) may be connected to one of the second scan lines (SSL1 to SSLn) and one of the readout lines (RL1 to RLm).

[0062] For example, a pixel (PX) located in the i-th row and the j-th column may be connected to the i-th first scan line (SLi), the i-th second scan line (SSLi), the j-th data line (DLj), and the j-th readout line (RLj) (wherein, i and j are natural numbers greater than or equal to 2). In addition, the pixel (PX) may be connected to a first power line (PL1) to which a first driving power (VDD) is applied and a second power line (PL2) to which a second driving power (VSS) is applied.

[0063] Here, the first driving power supply (VDD) may be a power supply that supplies driving current to the pixel (PX), and the second driving power supply (VSS) may be a power supply that receives driving current from the pixel (PX). During the light emission period of the pixel (PX), the first driving power supply (VDD) may be set to a higher voltage than the second driving power supply (VSS).

[0064] A pixel (PX) can be initialized by an initialization power supply (VINT) provided through a readout line (RLj) in response to a second scan signal provided through a second scan line (SSLi), and can receive a data signal (or data voltage) through a data line (DLj) in response to a first scan signal provided through a first scan line (SLi). The pixel (PX) can generate light of a brightness corresponding to the data signal while controlling an amount of current flowing from a first driving power supply (VDD) to a second driving power supply (VSS) via a light-emitting element (LD) (see FIG. 2) in response to the data signal. The initialization power supply (VINT) can be set to a voltage lower than an operating point (or threshold voltage) of the light-emitting element (LD).

[0065] The injection driver (120) can generate a first injection signal and a second injection signal based on a injection control signal (SCS). The first injection signal can be sequentially supplied to the first injection lines (SL1 to SLn), and the second injection signal can be sequentially supplied to the second injection lines (SSL1 to SSLn).

[0066] The scan control signal (SCS) may include a start signal and a clock signal, and may be provided from the timing control unit (140) to the scan driver (120). The scan driver (120) may be implemented as a shift register that sequentially shifts the start signal in response to the clock signal to sequentially generate and output a first scan signal in a pulse form. In addition, the scan driver (120) may generate and output a second scan signal in the same or similar manner as the method of generating the first scan signal.

[0067] The scanning driver (120) may be formed together with the pixel (PX) on the pixel unit (110). However, the embodiment of the present invention is not limited thereto, and for example, the scanning driver (120) may be mounted on a circuit film and connected to the timing control unit (140) via at least one circuit film and a printed circuit board.

[0068] The data driving unit (130) can generate a data signal (or data voltage) based on the output data (Dout) and data control signal (DCS) provided from the timing control unit (140), and provide the data signal to the pixel unit (110) (or pixel (PX)) through the data lines (DL1 to DLm). Here, the data control signal (DCS) can include a data enable signal, a data clock signal, etc. The data driving unit (130) can provide an initialization power supply (VINT) to the pixel unit (110) (or pixel (PX)) through the readout lines (RL1 to RLm).

[0069] In an embodiment, the data driver (130) may receive a sensing signal through the readout lines (RL1 to RLm) in a separate sensing section (for example, in a sensing section allocated for sensing characteristic information of the pixel (PX), such as a threshold voltage and / or mobility of a driving transistor included in the pixel (PX). The sensing signal may be used by the data driver (130) and / or the timing control unit (140) to compensate for the characteristics (or characteristic deviation) of the pixel (PX).

[0070] In an embodiment, the lead-out lines (RL1 to RLm) may be connected to a separate sensing unit. In this case, the voltage of the initialization power supply (VINT) may be supplied from the sensing unit to the pixel unit (110), or a sensing signal may be received through the lead-out lines (RL1 to RLm).

[0071] The timing control unit (140) can receive input data (Din) and a control signal (CS) from an external source (e.g., a graphics processor), and generate a scan control signal (SCS) and a data control signal (DCS) based on the control signal (CS). The timing control unit (140) can convert the input data (Din) to generate output data (Din). In addition, the timing control unit (140) can generate a sensing control signal (SECS) and supply it to the voltage / current sensing unit (160).

[0072] In one embodiment, the timing control unit (140) can calculate the load of the input data (Din). In addition, the timing control unit (140) can extract the peak grayscale of the input data (Din). The timing control unit (140) can generate a voltage code (Vcode) based on the load and peak grayscale of the input data (Din) and supply the generated voltage code (Vcode) to the power generation unit (150). The power generation unit (150) can control the voltage of the first driving power (VDD) in response to the voltage code (Vcode).

[0073] That is, the voltage of the first driving power supply (VDD) changes in response to the load and peak grayscale of the input data (Din), and in this case, the power consumption of the display device (100) can be reduced. The process of generating a voltage code (Vcode) in the timing control unit (140) will be described later with reference to FIG. 6.

[0074] The power generation unit (150) can supply a first driving power (VDD), a second driving power (VSS), and an initialization power (VINT) to the pixel unit (110). Here, the power generation unit (150) can change the voltage of the first driving power (VDD) in response to a voltage code (Vcode). In addition, the power generation unit (150) can provide a driving voltage required for driving to at least one of the scan driving unit (120), the data driving unit (130), the timing control unit (140), or the voltage / current sensing unit (160). The power generation unit (150) can be implemented as a power management integrated circuit (PMIC).

[0075] The first driving power (VDD) can be supplied to the pixel unit (110) through the first power line (PL1). The second driving power (VSS) can be supplied to the pixel unit (110) through the second power line (PL2). The initialization power (VINT) can be supplied to the data driving unit (130) through the third power line (PL3). The first power line (PL1) and the second power line (PL2) can be commonly connected to the pixels (PX).

[0076] A sensing resistor (Rs) may be connected to the first power line (PL1). In this case, the voltage (and current) of the first driving power (VDD) may be supplied to the pixel unit (110) via the sensing resistor (Rs).

[0077] The voltage / current sensing unit (160) can be electrically connected to both ends of the sensing resistor (Rs). The voltage / current sensing unit (160) can sense the voltage or current of the first driving power supply (VDD) in response to the sensing control signal (SECS).

[0078] In one embodiment, the voltage / current sensing unit (160) may sense the voltage of the first driving power supply (VDD) during a compensation period in response to a sensing control signal (SECS). For example, the compensation period may be located at a point in time when power is supplied to the display device (100) or at a point in time when power is supplied to the display device (100) after the usage time of the display device (100) exceeds a preset threshold value. For example, the compensation period may be included in a manufacturing process of the display device (100). The sensing voltage (SV) sensed by the voltage / current sensing unit (160) may be supplied to the timing control unit (140). The timing control unit (140) may compare the sensing voltage (SV) sensed by the voltage / current sensing unit (160) with a target voltage, and may modify the voltage code (Vcode) (or generate a compensation LUT) so that the sensing voltage (SV) becomes the same as the target voltage.

[0079] The voltage / current sensing unit (160) can sense the current of the first driving power supply (VDD) during a period excluding a correction period in response to a sensing control signal (SECS). Here, the period excluding the correction period may include a period in which images are displayed on the display device (100). The sensing current (SC) sensed by the voltage / current sensing unit (160) can be supplied to the timing control unit (140). For example, the timing control unit (140) can correct the input data (Din) in response to the sensing current (SC) to generate the output data (Dout). For example, the timing control unit (140) can control the display device (100) in response to the sensing current (SC) using various currently known methods.

[0080] FIG. 2 is a diagram illustrating an embodiment of a pixel illustrated in FIG. 1 according to an embodiment of the present invention. In FIG. 2, a pixel (PX) located in an i-th row and a j-th column is illustrated as an example. The pixel (PX) illustrated in FIG. 2 is an embodiment, and the structure of the pixel (PX) in an embodiment of the present invention is not limited thereto. For example, in an embodiment of the present invention, the pixel (PX) may be selected from any one of various circuits known in the art. In an embodiment of the present invention, the pixel (PX) may include additional components or fewer components without departing from the spirit and scope of the present disclosure.

[0081] Referring to FIG. 2, a pixel (PX) can be connected to a first scan line (SLi), a second scan line (SSLi), a data line (DLj), and a readout line (RLj).

[0082] A pixel (PX) may include a light emitting element (LD), a first transistor (T1) (or a driving transistor), a second transistor (T2), a third transistor (T3), and a storage capacitor (Cst). Each of the first transistor (T1), the second transistor (T2), and the third transistor (T3) may be a thin film transistor including an oxide semiconductor, but is not limited thereto. For example, at least some of the first transistor (T1), the second transistor (T2), and the third transistor (T3) may include a polysilicon semiconductor, or may be implemented as an N-type semiconductor or a P-type semiconductor.

[0083] A first electrode (or anode electrode) of a light-emitting element (LD) may be connected to a first power line (PL1) via a second node (N2) and a first transistor (T1), and a second electrode (or cathode electrode) may be connected to a second power line (PL2). The light-emitting element (LD) may emit light at a brightness corresponding to a driving current supplied from the first transistor (T1).

[0084] The light emitting element (LD) may be selected as an organic light emitting diode. In addition, the light emitting element (LD) may be selected as an inorganic light emitting diode such as a micro LED (light emitting diode) or a quantum dot light emitting diode. In addition, the light emitting element (LD) may be a device composed of a composite of organic and inorganic materials. Although FIG. 2 illustrates that the pixel (PX) includes a single light emitting element (LD), in another embodiment, the pixel (PX) includes a plurality of light emitting elements, and the plurality of light emitting elements may be connected to each other in series, in parallel, or in series-parallel.

[0085] A first electrode (e.g., a drain electrode) of a first transistor (T1) may be connected to a first power line (PL1) to which a first driving power (VDD) is applied, and a second electrode (e.g., a source electrode) may be connected to a second node (N2). A gate electrode of the first transistor (T1) may be connected to the first node (N1). The first transistor (T1) may control the amount of current flowing to the light-emitting element (LD) in response to a voltage of the first node (N1) (or a gate-source voltage applied between the second electrode and the gate electrode of the first transistor (T1)).

[0086] A first electrode of a second transistor (T2) may be connected to a data line (DLj), and a second electrode may be connected to a first node (N1). A gate electrode of the second transistor (T2) may be connected to a first scan line (SLi). When a first scan signal is supplied to the first scan line (SLi), the second transistor (T2) may be turned on to transmit a data signal (VDATA) from the data line (DLj) to the first node (N1).

[0087] A storage capacitor (Cst) may be formed or connected between a first node (N1) and a second node (N2). The storage capacitor (Cst) may store the voltage of the first node (N1).

[0088] A third transistor (T3) may be connected between a lead-out line (RLj) and a second node (N2). A gate electrode of the third transistor (T3) may be connected to a second scan line (SSLi). When a second scan signal is supplied to the second scan line (SSLi), the third transistor (T3) may be turned on to transmit the voltage of the initialization power supply (VINT) from the lead-out line (RLj) to the second node (N2).

[0089] When the second transistor (T2) and the third transistor (T3) are turned on simultaneously in response to the first and second scan signals, the voltage difference between the data signal (VDATA) and the initialization power supply (VINT) is stored in the storage capacitor (Cst). The first transistor (T1) can control the amount of current flowing to the light emitting element (LD) in response to the voltage difference stored in the storage capacitor (Cst).

[0090] In contrast, when the third transistor (T3) is turned on during the sensing period and the second node (N2) and the readout line (RLj) are connected, a sensing signal can be provided from the pixel (PX) to the readout line (RLj).

[0091] FIG. 3 is a diagram illustrating a power generation unit according to one embodiment of the present invention. In FIG. 3, only the components necessary for explaining the present invention (i.e., the components for generating the first driving power (VDD)) are illustrated. In the embodiment of the present invention, the power generation unit (150) may include additional components within the scope and spirit of the present disclosure.

[0092] Referring to FIG. 3, a power generation unit (150) according to one embodiment of the present invention may include a digital-to-analog converter (DAC) (152) and a DC-DC (DC-DC) converter (154).

[0093] The digital-to-analog converter (152) can generate a reference voltage (Vref) (or feedback voltage) corresponding to the voltage code (Vcode) and supply the reference voltage (Vref) to the DC-DC converter (154). For example, the digital-to-analog converter (152) can supply a reference voltage (Vref) between 0 V and 3.3 V (or up to 4.8 V) corresponding to the voltage code (Vcode) to the DC-DC converter (154).

[0094] The power generation unit (150) may further include a first resistor (RDAC) connected between the digital-to-analog converter (152) and the first node (N11), a first feedback resistor (RF1) connected between the first power line (PL1) and the first node (N11), and a second feedback resistor (RF2) connected between the first node (N11) and the base power (GND). The first node (N11) is electrically connected to the DC-DC converter (154) and may transmit a reference voltage (Vref) supplied via the first resistor (RDAC) to the DC-DC converter (154).

[0095] The DC-DC converter (154) can generate a first driving power (VDD) based on a reference voltage (Vref) and supply it to the first power line (PL1). In addition, the DC-DC converter (154) can finely control the voltage of the first driving power (VDD) by a feedback voltage by the first feedback resistor (RF1) and the second feedback resistor (RF2).

[0096] Meanwhile, the first driving power (VDD) generated from the DC-DC converter (154) must accurately maintain the target voltage corresponding to the voltage code (Vcode) in order to generate light of the desired brightness in the pixel (PX). For example, if the voltage of the first driving power (VDD) is different from the target voltage, light of the desired brightness is not generated in the pixel (PX).

[0097] However, the first driving power (VDD) may differ from the target voltage due to the tolerance of the digital-to-analog converter (152) and the feedback resistors (RF1, RF2). For example, the tolerance of each of the digital-to-analog converter (152) and the feedback resistors (RF1, RF2) may be set to ±1%, and the first driving power (VDD) may differ from the target voltage due to this tolerance. In an embodiment of the present invention, it is possible to generate the first driving power (VDD) equal to the target voltage regardless of the tolerance of the circuits (for example, DAC, RF1, RF2, etc.).

[0098] Fig. 4 is a diagram showing the voltage of the first driving power supply corresponding to the voltage code. Fig. 5 is a diagram showing the power consumption corresponding to the load of the pixel unit.

[0099] In Fig. 4, it is assumed that the voltage code (Vcode) is 8 bits. The voltage of the first driving power supply (VDD) can be changed from approximately 12 V to 28 V (here, 12 V to 28 V are exemplary values, and the present invention is not limited thereto) in response to the load and peak grayscale of the pixel unit (110). That is, the power generation unit (150) can generate the first driving power supply (VDD) having a voltage of approximately 12 V to 28 V based on the voltage code (Vcode).

[0100] Referring to FIG. 4, VDD(ref) refers to the target voltage of the first driving power supply (VDD). If there is no tolerance of the circuits, the voltage generation unit (150) can generate the first driving power supply (VDD) having the voltage of VDD(ref) in response to the voltage code. However, the voltage generation unit (150) can generate the voltage of the first driving power supply (VDD) lower than VDD(ref) (i.e., VDD(min)) or the voltage of the first driving power supply (VDD) higher than VDD(ref) (i.e., VDD(max)) depending on the tolerance of the circuits.

[0101] For example, if the voltage of the first driving power supply (VDD) is higher than the target voltage (i.e., VDD(ref)), it may be set higher than the preset power consumption of the display device (100) as illustrated in FIG. 5. In this case, the circuits included in the display device (100) may be damaged, and in severe cases, the circuits may be burned.

[0102] FIG. 6 is a diagram illustrating a timing control unit according to one embodiment of the present invention. While the timing control unit (140) of FIG. 6 includes various components, the present invention is not limited thereto. For example, in embodiments of the present invention, the timing control unit (140) may include additional components or fewer components without departing from the spirit and scope of the present invention.

[0103] Referring to FIG. 6, the timing control unit (140) may include a sensing control unit (142), a voltage adjustment unit (144), an analysis unit (146), and a code value generation unit (148).

[0104] The analysis unit (146) can calculate (or analyze) the load of the input data (Din) or extract the peak grayscale (or maximum grayscale) (PG). To this end, the analysis unit (146) can be equipped with a grayscale analysis unit (1462) and a load analysis unit (1464).

[0105] The grayscale analysis unit (1462) can extract a peak grayscale (PG) from input data (Din) of one frame. Here, the peak grayscale (PG) can mean the highest grayscale among the input data (Din) included in one frame.

[0106] The load analysis unit (1464) can calculate the load of one frame based on input data (Din). For example, the load analysis unit (1464) can calculate the load by averaging the grayscale of the input data (Din) of one frame. Various currently known methods can be used to calculate the load in the load analysis unit (1464).

[0107] The code value generation unit (148) can generate a voltage code (Vcode) corresponding to the voltage of the first driving power (VDD) to be supplied to the current frame in response to the peak grayscale (PG) and load, and supply the generated voltage code (Vcode) to the power generation unit (150).

[0108] The sensing control unit (142) can supply a sensing control signal (SECS) to the current / voltage sensing unit (160). For example, the sensing control unit (142) can supply the sensing control signal (SECS) so that the voltage is sensed by the current / voltage sensing unit (160) at least once during the process (for example, during a compensation period). For example, the sensing control unit (142) can supply the sensing control signal (SECS) so that the voltage is sensed by the current / voltage sensing unit (160) at the time when power is supplied to the display device (100) (or, power on) or at the time when power is supplied to the display device (100) after the usage time of the display device (100) exceeds a preset threshold (for example, during a compensation period). The sensing control unit (142) can supply a sensing control signal (SECS) so that current is sensed by the current / voltage sensing unit (160) during a period in which the display device (100) is normally operated.

[0109] The voltage / current sensing unit (160) can sense the voltage or current of the first driving power source (VDD) from the sensing resistor (Rs) in response to the sensing control signal (SECS). The sensing voltage (SV) sensed by the voltage / current sensing unit (160) can be supplied to the voltage regulation unit (144). The sensing current (SC) sensed by the voltage / current sensing unit (160) can be supplied to a scale control unit, etc.

[0110] The voltage regulation unit (144) may be equipped with a target lock-up table (LUT) (1442), a voltage error determination unit (1444), a reference LUT (1448), and a compensation LUT generation unit (1446).

[0111] The target LUT (1442) can store the voltage value (or target voltage, target voltage) of the first driving power (VDD) to be supplied to the pixel unit (110) corresponding to the voltage code (Vcode).

[0112] The voltage error judgment unit (1444) can compare the target voltage corresponding to the voltage code (Vcode) with the sensing voltage (SV) sensed by the current / voltage sensing unit (160), and generate an offset (Offset) corresponding to the comparison result. Here, the offset (Offset) can be controlled so that the target voltage and the sensing voltage (SV) match.

[0113] The reference LUT (1448) stores the voltage of the first driving power supply (VDD) corresponding to the voltage code (Vcode). The reference LUT (1448) may be the same LUT as the target LUT (1442).

[0114] The compensation LUT generation unit (1446) can generate a compensation LUT by reflecting an offset to the reference LUT (1448). The compensation LUT can be stored within the compensation LUT generation unit (1446) and can be set so that the target voltage and the sensing voltage (SV) match. That is, the compensation LUT is generated by reflecting the offset to the reference LUT (1448), and when the voltage code (Vcode) is generated using the compensation LUT, the target voltage and the sensing voltage (SV) can be the same.

[0115] FIG. 7a and FIG. 7b are diagrams showing a method for generating a compensation LUT when the sensing voltage is higher than the target voltage.

[0116] Referring to FIGS. 6 to 7b, during the compensation period, the sensing control unit (142) supplies a sensing control signal (SECS) (for example, supplies a first level sensing control signal (SECS)) so that the voltage of the first driving power supply (VDD) is sensed by the current / voltage sensing unit (160).

[0117] The analysis unit (146) can generate a peak grayscale (PG) and load of one frame using input data (Din) and supply them to the code value generation unit (148). For example, the input data (Din) input during the correction period can be stored in advance in the timing control unit (140). For example, the input data (Din) input during the correction period can be supplied from outside the display device (100).

[0118] The code value generation unit (148) can generate a voltage code (Vcode) corresponding to the peak grayscale (PG) and load. Here, before the compensation LUT is generated, the code value generation unit (148) can generate the voltage code (Vcode) using the reference LUT (1448).

[0119] A digital-to-analog converter (152) supplied with a voltage code (Vcode) can supply a reference voltage (Vref) corresponding to the voltage code (Vcode) to a DC-DC converter (154). The DC-DC converter (154) can supply a voltage of a first driving power source (VDD) corresponding to the reference voltage (Vref) to a first power line (PL1).

[0120] The current / voltage sensing unit (160) can measure the voltage of the first driving power supply (VDD) using the voltage across the sensing resistor (Rs) and supply the measured voltage of the first driving power supply (VDD) as a sensing voltage (SV) to the voltage error determination unit (1444).

[0121] The voltage error determination unit (1444) can determine that the voltage of the first driving power supply (VDD) is measured by the current / voltage sensing unit (160) in response to the sensing control signal (SECS). The voltage error determination unit (1444) can determine the target voltage of the first driving power supply (VDD) using the voltage code (Vcode) input from the code value generation unit (148) and the target LUT (1442) (or, the reference LUT (1448)).

[0122] For example, if the voltage code (Vcode) corresponds to the first grayscale under a given load condition, the voltage error determination unit (1444) can set the target voltage to 13.5 V using the target LUT (1442). If the voltage code (Vcode) corresponds to the second grayscale under a given load condition, the voltage error determination unit (1444) can set the target voltage to 19.0 V using the target LUT (1442). If the voltage code (Vcode) corresponds to the third grayscale under a given load condition, the voltage error determination unit (1444) can set the target voltage to 24.8 V using the target LUT (1442).

[0123] In the embodiment, when the voltage code (Vcode) corresponds to the first grayscale and the sensing voltage (SV) is set to 14.1 V, the value obtained by subtracting the sensing voltage (SV) from the target voltage is set to -0.6 V. The voltage error determination unit (1444) can supply an offset, for example, an offset of -10, corresponding to -0.6 V to the compensation LUT generation unit (1446).

[0124] In the embodiment, when the voltage code (Vcode) corresponds to the second grayscale and the sensing voltage (SV) is set to 20.2 V, the value obtained by subtracting the sensing voltage (SV) from the target voltage is set to -1.2 V. The voltage error determination unit (1444) can supply an offset, for example, an offset of -20, corresponding to -1.2 V to the compensation LUT generation unit (1446).

[0125] In the embodiment, when the voltage code (Vcode) corresponds to the third grayscale and the sensing voltage (SV) is set to 26.6 V, the value obtained by subtracting the sensing voltage (SV) from the target voltage is set to -1.8 V. The voltage error determination unit (1444) can supply an offset, for example, an offset of -30, corresponding to -1.8 V to the compensation LUT generation unit (1446).

[0126] The compensation LUT generation unit (1446) can extract a voltage code (Vcode) (e.g., 40) corresponding to the first grayscale from the reference LUT (1448) and generate a compensation LUT by reflecting an offset (e.g., -10) to the voltage code (Vcode). In this case, the voltage code (Vcode) corresponding to the first grayscale in the compensation LUT can be set to 30.

[0127] Thereafter, the code value generation unit (148) generates a voltage code (Vcode) using the compensation LUT, and in this case, a voltage code (Vcode) of 30 corresponding to the first grayscale can be supplied to the power generation unit (150). Then, the sensing voltage (SV) measured by the current / voltage sensing unit (160) can be set to the same voltage as the target voltage (for example, 13.5 V).

[0128] The compensation LUT generation unit (1446) can extract a voltage code (Vcode) (e.g., 128) corresponding to the second grayscale from the reference LUT (1448) and generate a compensation LUT by reflecting an offset (e.g., -20) to the voltage code (Vcode). In this case, the voltage code (Vcode) corresponding to the second grayscale in the compensation LUT can be set to 108.

[0129] Thereafter, the code value generation unit (148) generates a voltage code (Vcode) using the compensation LUT, and in this case, a voltage code (Vcode) of 108 corresponding to the second grayscale can be supplied to the power generation unit (150). Then, the sensing voltage (SV) measured by the current / voltage sensing unit (160) can be set to the same voltage as the target voltage (for example, 19.0 V).

[0130] The compensation LUT generation unit (1446) can extract a voltage code (Vcode) (e.g., 220) corresponding to the third grayscale from the reference LUT (1448) and generate a compensation LUT by reflecting an offset (e.g., -30) to the voltage code (Vcode). In this case, the voltage code (Vcode) corresponding to the third grayscale in the compensation LUT can be set to 190.

[0131] Thereafter, the code value generation unit (148) generates a voltage code (Vcode) using the compensation LUT, and in this case, a voltage code (Vcode) of 190 corresponding to the third grayscale can be supplied to the power generation unit (150). Then, the sensing voltage (SV) measured by the current / voltage sensing unit (160) can be set to the same voltage as the target voltage (for example, 24.8 V).

[0132] Additionally, the compensation LUT generation unit (1446) can generate the remaining grayscales by interpolation in a given load except for the first grayscale, the second grayscale, and the third grayscale. That is, the compensation LUT generation unit (1446) can generate a compensation LUT corresponding to all grayscales in a given load.

[0133] As described above, in the embodiment of the present invention, the voltage of the first driving power supply (VDD) supplied to the pixel unit (110) can be controlled to be identical to the target voltage, thereby ensuring driving stability. In addition, when the voltage of the first driving power supply (VDD) is set to be identical to the target voltage, an image of a desired brightness can be displayed in the pixel unit (110).

[0134] FIGS. 8A and 8B are diagrams illustrating a method for generating a compensation LUT when the sensing voltage is lower than the target voltage. When describing FIGS. 8A and 8B, a duplicate description of the configuration described with reference to FIGS. 7A and 7B may be omitted.

[0135] Referring to FIG. 6, FIG. 8a and FIG. 8b, the voltage error determination unit (1444) can determine the target voltage of the first driving power supply (VDD) using the voltage code (Vcode) input from the code value generation unit (148) and the target LUT (1442) (or, the reference LUT (1448)).

[0136] For example, if the voltage code (Vcode) corresponds to the first grayscale under a given load condition, the voltage error determination unit (1444) can set the target voltage to 13.5 V using the target LUT (1442). If the voltage code (Vcode) corresponds to the second grayscale under a given load condition, the voltage error determination unit (1444) can set the target voltage to 19.0 V using the target LUT (1442). If the voltage code (Vcode) corresponds to the third grayscale under a given load condition, the voltage error determination unit (1444) can set the target voltage to 24.8 V using the target LUT (1442).

[0137] In the embodiment, when the voltage code (Vcode) corresponds to the first grayscale and the sensing voltage (SV) is set to 12.9 V, the value obtained by subtracting the sensing voltage (SV) from the target voltage is set to 0.6 V. The voltage error determination unit (1444) can supply an offset (Offset), for example, an offset of 10, corresponding to 0.6 V to the compensation LUT generation unit (1446).

[0138] In the embodiment, when the voltage code (Vcode) corresponds to the second grayscale and the sensing voltage (SV) is set to 17.8 V, the value obtained by subtracting the sensing voltage (SV) from the target voltage is set to 1.2 V. The voltage error determination unit (1444) can supply an offset, for example, an offset of 20, corresponding to 1.2 V to the compensation LUT generation unit (1446).

[0139] In the embodiment, when the voltage code (Vcode) corresponds to the third grayscale and the sensing voltage (SV) is set to 23.0 V, the value obtained by subtracting the sensing voltage (SV) from the target voltage is set to 1.8 V. The voltage error determination unit (1444) can supply an offset, for example, an offset of 30, corresponding to 1.8 V to the compensation LUT generation unit (1446).

[0140] The compensation LUT generation unit (1446) can extract a voltage code (Vcode) (for example, 40) corresponding to the first grayscale from the reference LUT (1448) and generate a compensation LUT by reflecting an offset (for example, 10) to the voltage code (Vcode). In this case, the voltage code (Vcode) corresponding to the first grayscale in the compensation LUT can be set to 50.

[0141] Thereafter, the code value generation unit (148) generates a voltage code (Vcode) using the compensation LUT, and in this case, a voltage code (Vcode) of 50 corresponding to the first grayscale can be supplied to the power generation unit (150). Then, the sensing voltage (SV) measured by the current / voltage sensing unit (160) can be set to the same voltage as the target voltage (for example, 13.5 V).

[0142] The compensation LUT generation unit (1446) can extract a voltage code (Vcode) (e.g., 128) corresponding to the second grayscale from the reference LUT (1448) and generate a compensation LUT by reflecting an offset (e.g., 20) to the voltage code (Vcode). In this case, the voltage code (Vcode) corresponding to the second grayscale in the compensation LUT can be set to 148.

[0143] Thereafter, the code value generation unit (148) generates a voltage code (Vcode) using the compensation LUT, and in this case, the voltage code (Vcode) of 148 corresponding to the second grayscale can be supplied to the power generation unit (150). Then, the sensing voltage (SV) measured by the current / voltage sensing unit (160) can be set to the same voltage as the target voltage (for example, 19.0 V).

[0144] The compensation LUT generation unit (1446) can extract a voltage code (Vcode) (e.g., 220) corresponding to the third grayscale from the reference LUT (1448) and generate a compensation LUT by reflecting an offset (e.g., 30) to the voltage code (Vcode). In this case, the voltage code (Vcode) corresponding to the third grayscale in the compensation LUT can be set to 250.

[0145] Thereafter, the code value generation unit (148) generates a voltage code (Vcode) using the compensation LUT, and in this case, a voltage code (Vcode) of 250 corresponding to the third grayscale can be supplied to the power generation unit (150). Then, the sensing voltage (SV) measured by the current / voltage sensing unit (160) can be set to the same voltage as the target voltage (for example, 24.8 V).

[0146] Additionally, the compensation LUT generation unit (1446) can generate the remaining grayscales by interpolation in a given load except for the first grayscale, the second grayscale, and the third grayscale. That is, the compensation LUT generation unit (1446) can generate a compensation LUT corresponding to all grayscales in a given load.

[0147] Figures 9a and 9b are diagrams illustrating a compensation LUT generation method when the target voltage and the sensing voltage are the same. When describing Figures 9a and 9b, a duplicate description of the configuration described with reference to Figures 7a and 7b may be omitted.

[0148] Referring to FIG. 6, FIG. 9a and FIG. 9b, the voltage error determination unit (1444) can determine the target voltage of the first driving power supply (VDD) using the voltage code (Vcode) input from the code value generation unit (148) and the target LUT (1442) (or, the reference LUT (1448)).

[0149] For example, if the voltage code (Vcode) corresponds to the first grayscale under a given load condition, the voltage error determination unit (1444) can set the target voltage to 13.5 V using the target LUT (1442). If the voltage code (Vcode) corresponds to the second grayscale under a given load condition, the voltage error determination unit (1444) can set the target voltage to 19.0 V using the target LUT (1442). If the voltage code (Vcode) corresponds to the third grayscale under a given load condition, the voltage error determination unit (1444) can set the target voltage to 24.8 V using the target LUT (1442).

[0150] In the embodiment, when the voltage code (Vcode) corresponds to the first grayscale and the sensing voltage (SV) is set to 13.5 V, the value obtained by subtracting the sensing voltage (SV) from the target voltage is set to 0 V. The voltage error determination unit (1444) may supply an offset (Offset), for example, an offset of 0, corresponding to 0 V, to the compensation LUT generation unit (1446).

[0151] In the embodiment, when the voltage code (Vcode) corresponds to the second grayscale and the sensing voltage (SV) is set to 19.0 V, the value obtained by subtracting the sensing voltage (SV) from the target voltage is set to 0 V. The voltage error determination unit (1444) may supply an offset (Offset), for example, an offset of 0, corresponding to 0 V, to the compensation LUT generation unit (1446).

[0152] In the embodiment, when the voltage code (Vcode) corresponds to the third grayscale and the sensing voltage (SV) is set to 24.8 V, the value obtained by subtracting the sensing voltage (SV) from the target voltage is set to 0 V. The voltage error determination unit (1444) may supply an offset (Offset), for example, an offset of 0, corresponding to 0 V, to the compensation LUT generation unit (1446).

[0153] The compensation LUT generation unit (1446) can extract a voltage code (Vcode) (for example, 40) corresponding to the first grayscale from the reference LUT (1448) and generate a compensation LUT by reflecting an offset (for example, 0) to the voltage code (Vcode). The compensation LUT generation unit (1446) can extract a voltage code (Vcode) (for example, 128) corresponding to the second grayscale from the reference LUT (1448) and generate a compensation LUT by reflecting an offset (for example, 0) to the voltage code (Vcode). The compensation LUT generation unit (1446) can extract a voltage code (Vcode) (for example, 220) corresponding to the third grayscale from the reference LUT (1448) and generate a compensation LUT by reflecting an offset (for example, 0) to the voltage code (Vcode).

[0154] If the target voltage and the sensing voltage (SV) are the same, the offset is set to 0, in which case the compensation LUT can have the same value as the reference LUT (1448).

[0155] FIG. 10A and FIG. 10B are diagrams illustrating a compensation LUT generation method according to an embodiment of the present invention. Referring to FIG. 7A to FIG. 9B, a method of generating a compensation LUT using voltage codes corresponding to the first grayscale, the second grayscale, and the third grayscale under a predetermined load condition has been described. In this case, a compensation LUT must be generated for each of the multiple loads included in the display device (100), and thus, a lot of time may be required to generate the compensation LUT.

[0156] Referring to FIG. 6, FIG. 10a and FIG. 10b, the display device (100) can control the voltage of the first driving power supply (VDD) in response to a load between a minimum load (Min Load) and a maximum load (Max Load).

[0157] During the first period of the compensation period, input data (Din) corresponding to the minimum load and peak grayscale (e.g., 0 Gray) may be supplied to the analysis unit (146). Then, the analysis unit (146) may supply the minimum load as the load and the minimum grayscale as the peak grayscale (PG) to the code value generation unit (148). The code value generation unit (148) may supply the first voltage code as the voltage code (Vcode), and accordingly, a compensation LUT may be generated corresponding to the first voltage code during the first period. In this case, a compensation LUT in which an offset is reflected in the first voltage code may be generated so that a target first voltage can be generated.

[0158] During the second period of the compensation period, input data (Din) corresponding to the intermediate load and peak grayscale (for example, 128 Gray) may be supplied to the analysis unit (146). The intermediate load may refer to a load located in the middle between the minimum load and the maximum load. The intermediate grayscale may refer to a grayscale located in the middle between the minimum grayscale and the maximum grayscale. The analysis unit (146) may supply the intermediate load as the load and the intermediate grayscale as the peak grayscale (PG) to the code value generation unit (148). The code value generation unit (148) may supply the second voltage code as the voltage code (Vcode), and accordingly, a compensation LUT may be generated corresponding to the second voltage code during the second period. In this case, a compensation LUT in which an offset is reflected in the second voltage code may be generated so that a target second voltage can be generated.

[0159] During the third period of the compensation period, input data (Din) corresponding to the maximum load and peak grayscale (e.g., 255 Gray) may be supplied to the analysis unit (146). The analysis unit (146) may supply the maximum load as the load and the maximum grayscale as the peak grayscale (PG) to the code value generation unit (148). The code value generation unit (148) may supply the third voltage code as the voltage code (Vcode), and accordingly, a compensation LUT may be generated corresponding to the third voltage code during the third period. In this case, a compensation LUT in which an offset is reflected in the third voltage code may be generated so that a target third voltage can be generated.

[0160] After a compensation LUT corresponding to the minimum load and the lowest grayscale, a compensation LUT corresponding to the intermediate load and the intermediate grayscale, and a compensation LUT corresponding to the maximum load and the maximum grayscale are generated, the compensation LUT generation unit (1446) can interpolate and generate the remaining values. Then, during the period in which the compensation LUT is generated, compensation LUTs corresponding to all loads and all grayscales can be generated in response to the three voltage codes (Vcode).

[0161] FIG. 11a and FIG. 11b are diagrams showing compensation voltages when the offset is 0 corresponding to the first to third voltage codes.

[0162] Referring to FIGS. 11A and 11B, when the offset is 0 in each of the first to third voltage codes, it means that the target voltage and the sensing voltage (SV) are the same. In this case, the compensation LUT maintains the initial reference LUT (1448), and accordingly, the voltage of the first driving power supply (VDD) does not change.

[0163] FIG. 12a and FIG. 12b are diagrams showing compensation voltages when the offset has a positive value corresponding to the first voltage code to the third voltage code.

[0164] Referring to FIGS. 12A and 12B, if the offset has a positive value in each of the first to third voltage codes, it means that the target voltage is higher than the sensing voltage (SV). In this case, a compensation LUT is generated by applying an offset having a positive value, and accordingly, the power generation unit (150) can generate a higher voltage compared to the initial (or reference LUT (1448)).

[0165] FIG. 13a and FIG. 13b are diagrams showing compensation voltages when the offset has a negative value corresponding to the first voltage code to the third voltage code.

[0166] Referring to FIGS. 13A and 13B, if the offset has a negative value in each of the first to third voltage codes, it means that the target voltage is lower than the sensing voltage (SV). In this case, a compensation LUT is generated by applying an offset having a negative value, and accordingly, the power generation unit (150) can generate a lower voltage compared to the initial (or reference LUT (1448)).

[0167] Fig. 14 is a diagram showing power consumption corresponding to the load of a pixel unit according to one embodiment of the present invention. Fig. 14 shows a case where the initial sensing voltage (SV) is higher than the target voltage.

[0168] Referring to Fig. 14, if the sensing voltage (SV) is higher than the target voltage, a negative value can be applied as an offset to generate a compensation LUT. Then, the code value generation unit (148) can generate a voltage code (Vcode) using the compensation LUT. In this case, the power consumption corresponding to the design of the display device (100) can be reduced (i.e., the power consumption is reduced compared to before compensation), and thus the stability of driving can be secured.

[0169] FIG. 15 is a drawing showing an electronic device according to one embodiment of the present invention.

[0170] Referring to FIG. 15, an electronic device (1000) according to an embodiment of the present invention outputs various information through a display module (1140). When the processor (1110) executes an application stored in the memory (1120), the display module (1140) provides application information to the user through a display panel (1141).

[0171] The processor (1110) obtains external input through the input module (1130) or the sensor module (1161) and executes an application corresponding to the external input. For example, when a user selects a camera icon (or a camera application icon) displayed on the display panel (1141), the processor (1110) obtains the user input through the input sensor (1161-2) and activates the camera module (1171). The processor (1110) transmits image data corresponding to the captured image obtained through the camera module (1171) to the display module (1140). The display module (1140) can display an image corresponding to the captured image through the display panel (1141).

[0172] As another example, when personal information authentication is performed in the display module (1140), the fingerprint sensor (1161-1) acquires the input fingerprint information as input data. The processor (1110) compares the input data acquired through the fingerprint sensor (1161-1) with the authentication data stored in the memory (1120) and executes an application based on the comparison result. The display module (1140) can display the information executed according to the logic of the application through the display panel (1141). The fingerprint sensor (1161-1) can be arranged to acquire fingerprint information in the entire area of ​​the display module (1140) (or, the display panel (1141)).

[0173] As another example, when a music streaming icon displayed on the display module (1140) is selected, the processor (1110) obtains user input through the input sensor (1161-2) and activates a music streaming application stored in the memory (1120). When a music execution command is input from the music streaming application, the processor (1110) activates the audio output module (1163) to provide the user with audio information corresponding to the music execution command.

[0174] Above, the operation of the electronic device (1000) has been briefly described. Below, the configuration of the electronic device (1000) will be described in detail. Some of the configurations of the electronic device (1000) described below may be integrated and provided as a single configuration, or one configuration may be provided by being separated into two or more configurations.

[0175] The electronic device (1000) can communicate with an external electronic device (2000) via a network (e.g., a short-range wireless communication network or a long-range wireless communication network). According to one embodiment, the electronic device (1000) can include a processor (1110), a memory (1120), an input module (1130), a display module (1140), a power module (1150), a built-in module (1160), and an external module (1170). According to one embodiment, the electronic device (1000) can have at least one of the above-described components omitted, or one or more other components added. According to one embodiment, some of the above-described components (e.g., the sensor module (1161), the antenna module (1162), or the audio output module (1163)) can be integrated into another component (e.g., the display module (1140)).

[0176] The processor (1110) may execute software to control at least one other component (e.g., a hardware or software component) of the electronic device (1000) connected to the processor (1110) and perform various data processing or operations. According to one embodiment, as at least a part of the data processing or operations, the processor (1110) may store commands or data received from other components (e.g., an input module (1130), a sensor module (1161), or a communication module (1173)) in a volatile memory (1121), process the commands or data stored in the volatile memory (1121), and store result data in a non-volatile memory (1122).

[0177] The processor (1110) may include a main processor (1111) and a secondary processor (1112). The main processor (1111) may include a central processing unit (CPU: central processing unit) (1111-1). The main processor (1111) may further include one or more of a graphic processing unit (GPU: graphic processing unit) (1111-2), a communication processor (CP: communication processor), and an image signal processor (ISP: image signal processor). The main processor (1111) may further include a neural network processing unit (NPU: neural processing unit) (1111-3). The neural network processing unit (1111-3) is a processor specialized in processing artificial intelligence models, and the artificial intelligence models may be generated through machine learning. The artificial intelligence models may include a plurality of artificial neural network layers. The artificial neural network may be one of a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), deep Q-networks, or a combination of two or more of the above, but is not limited to the examples described above. In addition to or as an alternative to the hardware structure, the artificial intelligence model may include a software structure. At least two of the processing units and processors described above may be implemented as a single integrated configuration (e.g., a single chip), or each may be implemented as an independent configuration (e.g., multiple chips).

[0178] The auxiliary processor (1112) may include a controller (1112-1). The controller (1112-1) may include an interface conversion circuit and a timing control circuit. For example, the controller (1112-1) may include the timing control unit (140) illustrated in FIGS. 1 and 6. The controller (1112-1) receives a video signal from the main processor (1111), converts the data format of the video signal to conform to the interface specifications with the display module (1140), and outputs the video data. The controller (1112-1) may output various control signals necessary for driving the display module (1140).

[0179] The controller (1112-1) can generate a compensation LUT using the compensation LUT generation unit (1446) during the compensation period. To this end, the controller (1112-1) can be equipped with a sensing control unit (142), a voltage adjustment unit (144), an analysis unit (146), and a code value generation unit (148).

[0180] The auxiliary processor (1112) may further include a data conversion circuit (1112-2), a gamma correction circuit (1112-3), a rendering circuit (1112-4), a touch control circuit (1112-5), etc. The data conversion circuit (1112-2) may receive image data from the controller (1112-1), and may compensate for the image data so that the image is displayed at a desired brightness according to the characteristics of the electronic device (1000) or the user's settings, or may convert the image data to reduce power consumption or compensate for afterimages.

[0181] The gamma correction circuit (1112-3) can convert image data or a gamma reference voltage, etc. so that the image displayed on the electronic device (1000) has the desired gamma characteristics. The rendering circuit (1112-4) can receive image data from the controller (1112-1) and render the image data by taking into account the pixel layout of the display panel (1141) applied to the electronic device (1000).

[0182] The touch control circuit (1112-5) can supply a touch signal to the input sensor (1161-2) and receive a sensing signal from the input sensor (1161-2) in response to the touch signal.

[0183] At least one of the data conversion circuit (1112-2), the gamma correction circuit (1112-3), the rendering circuit (1112-4), or the touch control circuit (1112-5) may be integrated into another component (e.g., the main processor (1111) or the controller (1112-1)). At least one of the data conversion circuit (1112-2), the gamma correction circuit (1112-3), or the rendering circuit (1112-4) may also be integrated into the source driver (1143) described below.

[0184] The memory (1120) can store various data used by at least one component (e.g., the processor (1110) or the sensor module (1161)) of the electronic device (1000) and input data or output data for commands related thereto. In addition, the memory (1120) can store various setting data corresponding to the user's settings. In addition, the memory (1120) can store the target LUT (1442), the reference LUT (1448), the compensation LUT, etc. shown in FIG. 6. However, the target LUT (1442), the reference LUT (1448), the compensation LUT, etc. may also be stored in the internal memory of the controller (1112-1). The memory (1120) can include at least one of a volatile memory (1121) and a non-volatile memory (1122).

[0185] The input module (1130) can receive commands or data to be used in components of the electronic device (1000) (e.g., a processor (1110), a sensor module (1161), or an audio output module (1163)) from an external source of the electronic device (1000) (e.g., a user or an external electronic device (2000)).

[0186] The input module (1130) may include a first input module (1131) for inputting a command or data from a user and a second input module (1132) for inputting a command or data from an external electronic device (2000). The first input module (1131) may include a microphone, a mouse, a keyboard, a key (e.g., a button), or a pen (e.g., a passive pen or an active pen). The second input module (1132) may support a designated protocol that can be connected to the external electronic device (2000) by wire or wirelessly. According to one embodiment, the second input module (1132) may include a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface. The second input module (1132) may include a connector that can be physically connected to the external electronic device (2000), for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0187] The display module (1140) provides visual information to the user. The display module (1140) may include a display panel (1141), a gate driver (1142), a source driver (1143), and a voltage generation circuit (1144). The display module (1140) may further include a window, a chassis, and a bracket for protecting the display panel (1141). Such a display module (1140) may include at least a portion of the configuration of the display device (100) illustrated in FIG. 1.

[0188] The display panel (1141) (or display) may include a liquid crystal display panel, an organic light-emitting display panel, or an inorganic light-emitting display panel, and the type of the display panel (1141) is not particularly limited. The display panel (1141) may be of a rigid type or of a flexible type that can be rolled or folded. The display module (1140) may further include a supporter, a bracket, a heat dissipation member, or the like that supports the display panel (1141). The display panel (1141) may include the pixel unit (110) illustrated in FIG. 1.

[0189] The gate driver (1142) may be mounted on the display panel (1141) as a driving chip. In addition, the gate driver (1142) may be integrated into the display panel (1141). For example, the gate driver (1142) may include an ASG (Amorphous Silicon TFT Gate driver circuit), an LTPS (Low Temperature Polycrystalline Silicon) TFT Gate driver circuit, or an OSG (Oxide Semiconductor TFT Gate driver circuit) internalized in the display panel (1141). The gate driver (1142) receives a control signal from the controller (1112-1) and outputs scan signals to the display panel (1141) in response to the control signal. The gate driver (1142) may include the scan driver (120) illustrated in FIG. 1.

[0190] The display module (1140) may further include a light-emitting driver. The light-emitting driver outputs a light-emitting control signal to the display panel (1141) in response to a control signal received from the controller (1112-1). The light-emitting driver may be formed separately from the gate driver (1142) or may be integrated into the gate driver (1142).

[0191] The source driver (1143) receives a control signal from the controller (1112-1), converts image data into an analog voltage (e.g., a data signal) in response to the control signal, and then outputs the data signals to the display panel (1141). The source driver (1143) may include the data driving unit (130) illustrated in FIG. 1.

[0192] The source driver (1143) may be integrated into another component (e.g., the controller (1112-1)). The functions of the interface conversion circuit and timing control circuit of the controller (1112-1) described above may also be integrated into the source driver (1143). Additionally, the display module (1140) may further include the voltage / current sensing unit (160) illustrated in FIG. 1.

[0193] The voltage generation circuit (1144) can output various voltages required for driving the display panel (1141). For example, the voltage generation circuit (1144) can include the power generation unit (150) illustrated in FIG. 1. The voltage generation circuit (1144) can include the digital-to-analog converter (152) and the DC-DC converter (154) illustrated in FIG. 6. In an embodiment, the display panel (1141) can include the pixels (PX) illustrated in FIG. 1.

[0194] In an embodiment, the source driver (1143) may convert data corresponding to red (R), green (G), and blue (B) included in image data received from the processor (1110) into a red data signal (or data voltage), a green data signal, and a blue data signal, and provide the data to a plurality of pixel rows included in the display panel (1141) during one horizontal period.

[0195] The power module (1150) supplies power to components of the electronic device (1000). The power module (1150) may include a battery that charges a power voltage. The battery may include a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell. The power module (1150) may include a power management integrated circuit (PMIC). The PMIC supplies optimized power to each of the modules described above and those described below. The power module (1150) may include a wireless power transmitting / receiving element electrically connected to the battery. The wireless power transmitting / receiving element may include a plurality of coil-shaped antenna radiators. In an embodiment, at least some components of the power module (1150) and the voltage generation circuit (1144) may be provided as an integrated unit. For example, the voltage generation circuit (1144) may be included in the power module (1150).

[0196] The electronic device (1000) may further include a built-in module (1160) and an external module (1170). The built-in module (1160) may include a sensor module (1161), an antenna module (1162), and an audio output module (1163). The external module (1170) may include a camera module (1171), a light module (1172), and a communication module (1173).

[0197] The sensor module (1161) can detect input by the user's body or input by a pen among the first input modules (1131), and generate an electric signal or data value corresponding to the input. The sensor module (1161) can include at least one of a fingerprint sensor (1161-1), an input sensor (1161-2), and a digitizer (1161-3).

[0198] The fingerprint sensor (1161-1) can generate a data value corresponding to the user's fingerprint.

[0199] The input sensor (1161-2) can generate data values ​​corresponding to coordinate information of input by the user's body or input by a pen. The input sensor (1161-2) generates a data value based on the amount of change in electrostatic capacity due to the input. The input sensor (1161-2) can detect input by a passive pen or transmit and receive data with an active pen.

[0200] The input sensor (1161-2) can also measure bio-signals such as blood pressure, moisture, or body fat. For example, when a user touches a part of their body to the sensor layer or sensing panel and remains motionless for a certain period of time, the input sensor (1161-2) can detect the bio-signal based on the change in the electric field caused by the body part and output the information desired by the user to the display module (1140).

[0201] The digitizer (1161-3) can generate data values ​​corresponding to coordinate information input by the pen. The digitizer (1161-3) generates the electromagnetic change amount due to the input as a data value. The digitizer (1161-3) can detect input by a passive pen or transmit and receive data with an active pen.

[0202] At least one of the fingerprint sensor (1161-1), the input sensor (1161-2), and the digitizer (1161-3) may be implemented as a sensor layer formed on the display panel (1141) through a continuous process. At least one of the fingerprint sensor (1161-1), the input sensor (1161-2), and the digitizer (1161-3) may be disposed on the upper side of the display panel (1141), and any one of the fingerprint sensor (1161-1), the input sensor (1161-2), and the digitizer (1161-3), for example, the digitizer (1161-3), may be disposed on the lower side of the display panel (1141).

[0203] At least two of the fingerprint sensor (1161-1), the input sensor (1161-2), and the digitizer (1161-3) may be formed to be integrated into a single sensing panel through the same process. When integrated into a single sensing panel, the sensing panel may be arranged between the display panel (1141) and a window arranged on an upper side of the display panel (1141). According to one embodiment, the sensing panel may be arranged on the window, and the position of the sensing panel is not particularly limited.

[0204] At least one of the fingerprint sensor (1161-1), the input sensor (1161-2), and the digitizer (1161-3) can be built into the display panel (1141). That is, at least one of the fingerprint sensor (1161-1), the input sensor (1161-2), and the digitizer (1161-3) can be formed simultaneously through a process of forming elements (e.g., light-emitting elements, transistors, etc.) included in the display panel (1141).

[0205] In addition, the sensor module (1161) may generate an electrical signal or data value corresponding to an internal or external state of the electronic device (1000). The sensor module (1161) may further include, for example, a gesture sensor, a gyro sensor, a pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0206] The antenna module (1162) may include one or more antennas for transmitting or receiving signals or power to or from the outside. According to one embodiment, the communication module (1173) may transmit signals to or receive signals from an external electronic device through an antenna suitable for a communication method. The antenna pattern of the antenna module (1162) may be integrated into one component of the display module (1140) (e.g., the display panel (1141)) or the input sensor (1161-2).

[0207] The audio output module (1163) is a device for outputting audio signals to the outside of the electronic device (1000), and may include, for example, a speaker used for general purposes such as multimedia playback or recording playback, and a receiver used exclusively for phone reception. According to one embodiment, the receiver may be formed integrally with or separately from the speaker. The audio output pattern of the audio output module (1163) may also be integrated into the display module (1140).

[0208] The camera module (1171) can capture still images and videos. According to one embodiment, the camera module (1171) may include one or more lenses, image sensors, or image signal processors. The camera module (1171) may further include an infrared camera capable of measuring the presence of a user, the user's location, the user's line of sight, etc.

[0209] The light module (1172) can provide light. The light module (1172) can include a light emitting diode or a xenon lamp. The light module (1172) can operate in conjunction with the camera module (1171) or can operate independently.

[0210] The communication module (1173) can support the establishment of a wired or wireless communication channel between the electronic device (1000) and the external electronic device (2000), and the performance of communication through the established communication channel. The communication module (1173) can include any one or all of a wireless communication module such as a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module, and a wired communication module such as a local area network (LAN) communication module or a power line communication module. The communication module (1173) can communicate with the external electronic device (2000) through a short-range communication network such as Bluetooth, WiFi direct, or IrDA (infrared data association), or a long-range communication network such as a cellular network, the Internet, or a computer network (e.g., a LAN or WAN). The various types of communication modules (1173) described above can be implemented as one chip or can be implemented as separate chips.

[0211] The input module (1130), sensor module (1161), camera module (1171), etc. can be used to control the operation of the display module (1140) in conjunction with the processor (1110).

[0212] The processor (1110) outputs a command or data to the display module (1140), the audio output module (1163), the camera module (1171), or the light module (1172) based on input data received from the input module (1130). For example, the processor (1110) may generate image data corresponding to input data applied through a mouse or an active pen, and output the image data to the display module (1140), or generate command data corresponding to the input data and output the image data to the camera module (1171) or the light module (1172). When no input data is received from the input module (1130), the processor (1110) may switch the operation mode of the electronic device (1000) to a low-power mode or a sleep mode to reduce power consumption of the electronic device (1000).

[0213] The processor (1110) outputs a command or data to the display module (1140), the audio output module (1163), the camera module (1171), or the light module (1172) based on the sensing data received from the sensor module (1161). For example, the processor (1110) may compare the authentication data authorized by the fingerprint sensor (1161-1) with the authentication data stored in the memory (1120), and then execute an application based on the comparison result. The processor (1110) may execute a command or output corresponding image data to the display module (1140) based on the sensing data detected by the input sensor (1161-2) or the digitizer (1161-3). When the sensor module (1161) includes a temperature sensor, the processor (1110) may receive temperature data on the temperature measured from the sensor module (1161) and further perform brightness correction, etc. on the image data based on the temperature data.

[0214] The processor (1110) can receive measurement data regarding the presence or absence of a user, the user's location, the user's line of sight, etc. from the camera module (1171). The processor (1110) can further perform brightness correction, etc. on the image data based on the measurement data. For example, the processor (1110) that determines the presence or absence of a user through input from the camera module (1171) can output the image data with brightness corrected through the data conversion circuit (1112-2) or the gamma correction circuit (1112-3) to the display module (1140).

[0215] Some of the above components may be interconnected with each other through a communication method between peripheral devices, such as a bus, GPIO (general purpose input / output), SPI (serial peripheral interface), MIPI (mobile industry processor interface), or UPI (ultra path interconnect) link, to exchange signals (e.g., commands or data) with each other. The processor (1110) may communicate with the display module (1140) through a mutually agreed upon interface, and may use, for example, any one of the above-described communication methods, and is not limited to the above-described communication methods.

[0216] Although the present invention has been described above with reference to embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims.

Claims

1. A pixel unit having pixels connected to a first power line, a second power line, scan lines, and data lines; A sensing resistor located between the first power line and the pixel portion; A voltage / current sensing unit for measuring a sensing voltage from the sensing resistor during a compensation period; A timing control unit for generating a voltage code based on input data; A power generation unit is provided for supplying voltage of a first driving power source to the first power line corresponding to the above voltage code; A display device in which the timing control unit generates a compensation LUT so that the target voltage corresponding to the voltage code and the sensing voltage match during the compensation period.

2. In paragraph 1, A display device in which the above timing control unit generates a compensation LUT corresponding to a first voltage code of minimum load, a second voltage code of medium load, and a third voltage code of maximum load.

3. In paragraph 2, A display device in which the timing control unit interpolates the first voltage code, the second voltage code, and the third voltage code to generate a compensation LUT corresponding to the remaining load and the remaining voltage codes.

4. In paragraph 2, A display device wherein the first voltage code corresponds to the lowest grayscale, the second voltage code corresponds to the middle grayscale, and the third voltage code corresponds to the highest grayscale.

5. In paragraph 1, A display device wherein the above compensation period is positioned at the time when power is supplied to the display device, or at the time when power is supplied to the display device after the usage time of the display device exceeds a preset threshold value.

6. In paragraph 1, The above voltage / current sensing unit is a display device that measures the sensing current from the sensing resistor other than the above compensation period.

7. In paragraph 1, The above power generation unit An analog-to-digital converter for generating a reference voltage using the above voltage code; A display device having a DC-DC converter that generates the first driving power based on the reference voltage.

8. In paragraph 1, The above timing control unit calculates a load from the input data and an analysis unit for extracting a peak grayscale; A code value generation unit for generating the voltage code corresponding to the above load and peak grayscale; A display device having a voltage adjustment unit for generating the compensation LUT using an offset corresponding to the difference between the sensing voltage and the target voltage.

9. In paragraph 8, The above timing control unit A display device further comprising a sensing control unit that controls the voltage / current sensing unit so that the sensing voltage is measured during the compensation period, and controls the voltage / current sensing unit so that the sensing current is measured during a period other than the compensation period.

10. In paragraph 8, The above analysis section A load analysis unit for calculating load from the above input data; A display device having a tone analysis unit for extracting peak tone from the above input data.

11. In paragraph 8, The above voltage regulation unit A voltage error determination unit for extracting a target voltage corresponding to the voltage code from the target LUT and generating an offset corresponding to the difference between the sensing voltage and the target voltage; A display device having a compensation LUT generation unit for generating a compensation LUT by applying the offset to a reference LUT in which a target voltage corresponding to a voltage code is stored.

12. In paragraph 11, A display device in which the above target LUT is the same LUT as the above reference LUT.

13. In paragraph 11, A display device in which the voltage error judgment unit generates a negative value offset when the sensing voltage is higher than the target voltage, and generates a positive value offset when the sensing voltage is lower than the target voltage.

14. In paragraph 11, The above voltage error judgment unit is a display device that generates a value of “0” as an offset when the sensing voltage is equal to the target voltage.

15. In Article 11, The above code value generating unit is a display device that generates the voltage code using the compensation LUT during a period excluding the above correction period.

16. A step of generating a voltage of a first driving power supply corresponding to a voltage code during a correction period; A step of generating a sensing voltage by measuring the voltage of the first driving power source; A step of generating an offset by comparing the target voltage corresponding to the voltage code with the sensing voltage; A method for driving a display device, comprising the step of generating a compensation LUT using the above offset.

17. In paragraph 16, A method of driving a display device in which the above offset is generated so that the above sensing voltage becomes equal to the above target voltage.

18. In paragraph 16, A method for driving a display device for generating the voltage code using the compensation LUT during a period excluding the above compensation period.

19. In paragraph 16, A driving method of a display device, which generates the compensation LUT corresponding to a first voltage code of minimum load, a second voltage code of medium load, and a third voltage code of maximum load during the above compensation period.

20. In paragraph 19, A method for driving a display device further comprising the step of interpolating the first voltage code, the second voltage code, and the third voltage code to generate a compensation LUT corresponding to the remaining loads and the remaining codes.

21. In paragraph 19, A method for driving a display device, wherein the first voltage code corresponds to the lowest grayscale, the second voltage code corresponds to the middle grayscale, and the third voltage code corresponds to the highest grayscale.

22. In paragraph 16, A method of driving a display device, wherein the above compensation period is located at the time when power is supplied to the display device, or at the time when power is supplied to the display device after the usage time of the display device exceeds a preset threshold value.

23. In paragraph 16, In the step of generating the above offset, A driving method of a display device, which generates a negative value offset when the sensing voltage is higher than the target voltage, and generates a positive value offset when the sensing voltage is lower than the target voltage.

24. A display panel including pixels; A voltage generation circuit for supplying voltage of a first driving power source to the display panel based on a voltage code; A current / voltage sensing unit for generating a sensing voltage by measuring the voltage of the first driving power supplied to the display panel during the compensation period; A controller is provided for generating the voltage code based on input data; The above controller is an electronic device that generates a compensation LUT so that the target voltage corresponding to the voltage code and the sensing voltage are identical during the above compensation period.

25. In paragraph 24, The above controller The compensation LUT is generated corresponding to the first voltage code of minimum load, the second voltage code of medium load, and the third voltage code of maximum load; An electronic device for interpolating the first voltage code, the second voltage code, and the third voltage code to generate the compensation LUT corresponding to the remaining loads and the remaining codes.

26. In paragraph 24, The above controller is an electronic device that generates the voltage code using the compensation LUT during a period excluding the above compensation period.

Images