Display device

Abstract

The invention relates to a display device. The display device includes: a display panel including pixels; a voltage generator generating a driving voltage for operation of the display panel; and a driving controller receiving an input image signal and outputting an output image signal obtained by compensating the input image signal based on a characteristic of the display panel. The driving controller includes: a control unit that outputs an error correction value corresponding to a voltage difference between a voltage level of the driving voltage supplied from the voltage generator and a voltage level pre-stored in the control unit when the driving voltage is supplied from the voltage generator; and an image correction unit that converts the input image signal into the output image signal based on the error correction value.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and all benefits derived from Korean Patent Application No. 10-2023-0077948 filed in the Korean Intellectual Property Office on June 19, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments of the present disclosure described herein relate to a display device and an operating method of the display device, and more particularly, to a display device and an operating method of the display device capable of compensating an image signal to be suitable for characteristics of a display panel. Background Art

[0004] Generally, a display device includes a display panel for displaying an image and a driving circuit for driving the display panel. The display panel includes a plurality of scan lines, a plurality of data lines and a plurality of pixels. The driving circuit includes a data driving circuit that outputs a data driving signal to the data line, a scanning driving circuit that outputs a scanning signal for driving the scanning line, and a driving controller that controls the data driving circuit and the scanning driving circuit.

[0005] The display device may display an image by outputting a scan signal to a scan line connected to a pixel designated for display and supplying a data voltage corresponding to the display image to a data line connected to the pixel. Summary of the invention

[0006] Embodiments of the present disclosure provide a display device with improved display quality and an operating method of the display device.

[0007] According to an embodiment, a display device includes: a display panel including pixels; a voltage generator generating a driving voltage for operation of the display panel; and a driving controller receiving an input image signal and outputting an output image signal obtained by compensating the input image signal based on characteristics of the display panel. The driving controller includes: a control unit outputting an error correction value corresponding to a voltage difference between a voltage level of the driving voltage provided from the voltage generator and a voltage level pre-stored in the control unit when the driving voltage is provided from the voltage generator; and an image correction unit converting the input image signal into an output image signal based on the error correction value.

[0008] In an embodiment, the error correction value may include a first error correction value for error correction of sensing compensation and a second error correction value for error correction of optical compensation.

[0009] In an embodiment, the sensing compensation may be compensation for a voltage difference between a voltage of a data signal provided to a pixel and a sensing voltage fed back from the pixel.

[0010] In an embodiment, the display device may further include: a data driving circuit converting the output image signal into a data signal based on a driving voltage and providing the data signal to the pixel.

[0011] In an embodiment, the optical compensation may be compensation for a change in color characteristics between gray levels of a data signal provided to the display panel.

[0012] In an embodiment, the control unit may further output a voltage control signal for changing a voltage level of the driving voltage.

[0013] In an embodiment, the voltage generator may change a voltage level of the driving voltage in response to the voltage control signal.

[0014] In an embodiment, the voltage level pre-stored in the control unit may be a voltage level of a driving voltage generated by a test-dedicated voltage generator used in a manufacturing process.

[0015] According to an embodiment, a display device includes: a display panel including pixels; a voltage generator generating a driving voltage for operation of the display panel; and a driving controller receiving an input image signal and outputting an output image signal obtained by compensating the input image signal based on characteristics of the display panel. The driving controller includes: a control unit outputting an error correction value corresponding to a voltage difference between a voltage level of the driving voltage provided from the voltage generator and a voltage level pre-stored in the control unit when the driving voltage is provided from the voltage generator; an image correction unit outputting an intermediate image signal obtained by compensating the input image signal based on the characteristics of the display panel; and a voltage difference compensation lookup table converting the intermediate image signal into an output image signal based on the error correction value.

[0016] In an embodiment, the error correction value may include a first error correction value for error correction of sensing compensation and a second error correction value for error correction of optical compensation.

[0017] In an embodiment, the sensing compensation may be compensation for a voltage difference between a voltage of a data signal provided to a pixel and a sensing voltage fed back from the pixel.

[0018] In an embodiment, the display device may further include: a data driving circuit converting the output image signal into a data signal based on a driving voltage and providing the data signal to the pixel.

[0019] In an embodiment, the optical compensation may be compensation for a change in color characteristics between gray levels of a data signal provided to the display panel.

[0020] In an embodiment, the control unit may further output a voltage control signal for changing a voltage level of the driving voltage.

[0021] In an embodiment, the voltage generator may change a voltage level of the driving voltage in response to the voltage control signal.

[0022] In an embodiment, the voltage level pre-stored in the control unit may be a voltage level of a driving voltage generated by a test-dedicated voltage generator used in a manufacturing process.

[0023] According to an embodiment, an operating method of a display device includes: when voltage information of a driving voltage is provided from a voltage generator, determining whether the voltage information of the driving voltage provided from the voltage generator is consistent with pre-stored voltage information; when the pre-stored voltage information is inconsistent with the voltage information of the driving voltage provided from the voltage generator, determining whether there is a sensing compensation history; when it is determined that there is no sensing compensation history, providing a first error correction value for error correction of sensing compensation and a second error correction value for error correction of optical compensation; and compensating an input image signal based on the first error correction value and the second error correction value and providing an output image signal obtained by compensating the input image signal to a display panel of the display device.

[0024] In an embodiment, the operating method may further include: when it is determined that there is a sensing compensation history, determining whether the difference between the pre-stored voltage information and the voltage information of the driving voltage provided from the voltage generator can be compensated through sensing compensation; and when it is determined that the difference between the pre-stored voltage information and the voltage information of the driving voltage provided from the voltage generator can be compensated through sensing compensation, compensating the input image signal based on the second error correction value and outputting an output image signal obtained by compensating the input image signal based on the second error correction value.

[0025] In an embodiment, the operating method may further include: when it is determined that the difference between the pre-stored voltage information and the voltage information of the driving voltage provided from the voltage generator cannot be compensated by sensing compensation, compensating the input image signal based on the first error correction value and the second error correction value and outputting an output image signal obtained by compensating the input image signal based on the first error correction value and the second error correction value.

[0026] In an embodiment, sensing compensation may be compensation for a voltage difference between a voltage of a data signal supplied to a pixel of a display panel and a sensing voltage fed back from the pixel, and optical compensation may be compensation for a change in color characteristics between gray levels of a data signal supplied to a display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other aspects and features of the present disclosure will become apparent by describing in detail embodiments of the present disclosure with reference to the accompanying drawings.

[0028] Figure 1 is a perspective view of a display device according to an embodiment of the present disclosure.

[0029] Figure 2 is an exploded perspective view of a display device according to an embodiment of the present disclosure.

[0030] Figure 3 is a block diagram of a display device according to an embodiment of the present disclosure.

[0031] Figure 4 is an equivalent circuit diagram of a pixel according to an embodiment of the present disclosure.

[0032] Figure 5 is a diagram for describing a method for sensing and compensating for characteristics of a display panel in a manufacturing process.

[0033] Figure 6 is a diagram for describing a method for sensing and compensating for characteristics of a display panel in a display device whose manufacturing process is completed.

[0034] Figure 7 is a diagram illustrating an inspection process for optical compensation associated with a display panel in a manufacturing process.

[0035] Fig. 8A is a diagram showing the gamma characteristics of a display panel.

[0036] Figure 8B is a diagram showing the brightness characteristics of a display panel.

[0037] Fig.9A It is shown from Figure 5 FIG. 4 is a diagram of a second driving voltage output by a test-specific voltage generator as shown in FIG.

[0038] Fig. 9B It is shown from Figure 6 . A diagram of the second driving voltage output by the voltage generator shown in FIG.

[0039] Fig. 9C Is used for comparison Fig.9A The second driving voltage shown in Fig. 9B Graph of the second driving voltage shown in .

[0040] Fig.10 is a block diagram of a drive controller according to an embodiment of the present disclosure.

[0041] Fig.11 is a flowchart for describing the operation of the display device according to an embodiment of the present disclosure.

[0042] Fig.12 is a block diagram of a driving controller according to another embodiment of the present disclosure.

[0043] Fig.13 is a block diagram of a driving controller according to yet another embodiment of the present disclosure.

[0044] Fig.14 is a block diagram of a driving controller according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION

[0045] In the specification, the expression that a first component (or region, layer, part, etc.) is "on", "connected to" or "coupled to" a second component means that the first component is directly on, directly connected to or directly coupled to the second component, or means that a third component is interposed therebetween.

[0046] The same reference numerals / symbols refer to the same components. In addition, in the drawings, the thickness, proportion and size of the components are exaggerated for the effectiveness of the description of the technical content. "At least one (kind / item)" will not be interpreted as limiting "one" or "one (kind / item)". "Or" means "and / or". The term "and / or" includes one or more combinations of the relevant listed items.

[0047] The terms "first", "second", etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another component. For example, without departing from the scope and spirit of the present invention, the first component may be referred to as the "second component", and similarly, the second component may be referred to as the "first component". The articles "a", "one", and "the" are singular because they have a single referent, but the use of the singular form in this specification should not exclude the presence of more than one referent.

[0048] In addition, the terms "below", "under", "on", "over", etc. are used to describe the relationship between components shown in the drawings. These terms are relative and are described with reference to the directions indicated in the drawings.

[0049] It will be understood that the terms "include", "comprising", "having", etc. specify the presence of the features, quantities, steps, operations, elements or components, or a combination thereof, described in the specification, but do not exclude the possibility of the presence or addition of one or more other features, quantities, steps, operations, elements or components, or a combination thereof.

[0050] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this specification have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. In addition, unless explicitly defined herein, terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant field, and should not be interpreted in an idealized or overly formalized meaning.

[0051] Embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0052] Figure 1 is a perspective view of a display device DD according to an embodiment of the present disclosure, and Figure 2 is an exploded perspective view of a display device DD according to an embodiment of the present disclosure.

[0053] refer to Figure 1 and Figure 2 , the display device DD may be a device that is activated depending on an electrical signal. The display device DD according to the present disclosure may be a small or medium-sized electronic device such as a mobile phone, a tablet computer, a car navigation system, or a game console, and a large electronic device such as a television or a monitor. The above examples are provided only as examples, and it is obvious that the display device DD may include any other display device without departing from the concept of the present invention. The display device DD is in the shape of a rectangle having a long side (or side) in a first direction DR1 and a short side (or side) in a second direction DR2 intersecting with the first direction DR1. However, the shape of the display device DD is not limited thereto. For another example, the display device DD may be implemented in various shapes. The display device DD may display an image IM on a display surface IS that is parallel to each of the first direction DR1 and the second direction DR2 to face the third direction DR3. The display surface IS on which the image IM is displayed may correspond to the front surface of the display device DD.

[0054] In an embodiment, the front surface (or upper / top surface) and the rear surface (or lower / bottom surface) of each member are defined relative to the direction of displaying the image IM. The front surface and the rear surface may be opposite to each other in the third direction DR3, and the normal direction of each of the front surface and the rear surface may be parallel to the third direction DR3.

[0055] The spacing distance between the front and rear surfaces in the third direction DR3 may correspond to the thickness of the display device DD in the third direction DR3. Meanwhile, the directions indicated by the first direction DR1, the second direction DR2, and the third direction DR3 may be relative in concept and may be changed to different directions.

[0056] The display device DD can sense external input applied from the outside. The external input may include various types of inputs provided from the outside of the display device DD. The display device DD according to an embodiment of the present disclosure can sense the external input of the user applied from the outside. The external input of the user may be one of various types of external inputs (such as a part of his / her body, light, heat, his / her sight and pressure, or a combination thereof). In addition, the display device DD may sense the external input of the user applied to the side surface or rear surface of the display device DD depending on the structure of the display device DD and is not limited to any one embodiment. As an example of the present disclosure, the external input may include an input applied by using an input device (e.g., a stylus, an active pen, a touch pen, an electronic pen, or an electronic-like pen).

[0057] The display surface IS of the display device DD may be divided into a display area DA and a non-display area NDA. The display area DA may refer to an area where an image IM is displayed. A user visually perceives the image IM through the display area DA. In an embodiment, the display area DA is shown in the shape of a quadrilateral whose vertices are rounded. However, this is shown as an example. The display area DA may have various shapes and is not limited to any one embodiment.

[0058] The non-display area NDA is adjacent to the display area DA. The non-display area NDA may have a given color. The non-display area NDA may surround the display area DA. Thus, the shape of the display area DA may be substantially defined by the non-display area NDA. However, this is shown as an example. The non-display area NDA may be set to be adjacent to only one side of the display area DA or may be omitted. The display device DD according to an embodiment of the present disclosure may include various embodiments and is not limited to any one embodiment.

[0059] like Figure 2 As shown in , the display device DD may include a display module DM, a main circuit board MCB, a flexible circuit film D-FCB, a driver chip DIC, and a window WM. The display module DM may include a display panel DP and an input sensing layer ISP.

[0060] The display panel DP according to an embodiment of the present disclosure may be a light-emitting display panel. In an embodiment, for example, the display panel DP may be an organic light-emitting display panel, an inorganic light-emitting display panel, or a quantum dot light-emitting display panel. The emission layer of the organic light-emitting display panel may include an organic light-emitting material. The emission layer of the inorganic light-emitting display panel may include an inorganic light-emitting material. The emission layer of the quantum dot light-emitting display panel may include quantum dots, quantum rods, etc. In the following embodiments, description will be made in the case where the display panel DP is an organic light-emitting display panel.

[0061] The display panel DP may output an image IM, and the output image IM may be displayed through the display surface IS.

[0062] The input sensing layer ISP may be disposed on the display panel DP to sense external input. The input sensing layer ISP may be disposed directly on the display panel DP. According to an embodiment of the present disclosure, the input sensing layer ISP may be disposed on the display panel DP through a continuous process. That is, in the case where the input sensing layer ISP is disposed directly on the display panel DP, an internal adhesive film (not shown) is not interposed between the input sensing layer ISP and the display panel DP. In another embodiment, the internal adhesive film may be interposed between the input sensing layer ISP and the display panel DP. In this case, the input sensing layer ISP is not manufactured by a process after the same manufacturing process of the display panel DP. That is, the input sensing layer ISP may be manufactured by a process independent of the manufacturing process of the display panel DP, and may then be fixed on the upper surface of the display panel DP by an internal adhesive film.

[0063] The window WM may be formed of a transparent material capable of outputting the image IM. In an embodiment, for example, the window WM may be formed of glass, sapphire, plastic, etc. An example in which the window WM is implemented in a single layer is shown, but the present disclosure is not limited thereto. For another example, the window WM may include multiple layers.

[0064] In an embodiment, the window WM may include a light blocking pattern for defining the non-display area NDA. The light blocking pattern as a colored organic film may be formed, for example, in a coating manner.

[0065] The window WM may be coupled to the display module DM via an adhesive film. As an example of the present disclosure, the adhesive film may include an optically clear adhesive ("OCA") film. However, the adhesive film is not limited thereto. For another example, the adhesive film may include a typical adhesive or a sticky agent. In an embodiment, for example, the adhesive film may include an optically clear resin ("OCR") film or a pressure sensitive adhesive ("PSA") film.

[0066] The anti-reflection layer may also be interposed between the window WM and the display module DM. The anti-reflection layer reduces the reflectivity of external light incident from above the window WM. The anti-reflection layer according to an embodiment of the present disclosure may include a phase retarder and a polarizer. The phase retarder may be a film type or a liquid crystal coating type. The polarizer may also be a film type or a liquid crystal coating type. The film type may include a stretched synthetic resin film, and the liquid crystal coating type may include liquid crystals arranged in a given direction. The phase retarder and the polarizer may be implemented with a polarizing film.

[0067] As an example of the present disclosure, the anti-reflection layer may further include a color filter. Figure 3 ) determines the arrangement of the color filter. In addition, the anti-reflection layer may further include a light-blocking pattern.

[0068] The display module DM may display an image IM depending on an electrical signal, and may transmit / receive information related to an external input. The display module DM may be defined by an active area AA and a non-active area NAA. The active area AA may be defined as an area through which an image IM provided from the display area DA is output. In addition, the active area AA may be defined as an area in which the input sensing layer ISP senses an external input applied from the outside.

[0069] The non-active area NAA is adjacent to the active area AA. In an embodiment, for example, the non-active area NAA may surround the active area AA. However, this is shown as an example. In an embodiment, for example, the non-active area NAA may be defined in various shapes, not limited to any one embodiment. According to an embodiment, the active area AA of the display module DM may correspond to at least a portion of the display area DA.

[0070] The main circuit board MCB may be connected to the flexible circuit film D-FCB to be electrically connected to the display panel DP. The flexible circuit film D-FCB is connected to the display panel DP to electrically connect the display panel DP to the main circuit board MCB.

[0071] The main circuit board MCB may include a driving controller 100 and a voltage generator 300. The driving controller 100 may include a circuit for driving the display panel DP. The driver chips DIC may be mounted on the flexible circuit films D-FCB, respectively.

[0072] As an example of the present disclosure, the flexible circuit film D-FCB may include a first flexible circuit film D-FCB1, a second flexible circuit film D-FCB2, and a third flexible circuit film D-FCB3. The driver chip DIC may include a first driver chip DIC1, a second driver chip DIC2, and a third driver chip DIC3. The first flexible circuit film D-FCB1, the second flexible circuit film D-FCB2, and the third flexible circuit film D-FCB3 may be positioned to be spaced apart from each other in the first direction DR1, and may be connected to the display panel DP to electrically connect the display panel DP and the main circuit board MCB. The first driver chip DIC1 may be mounted on the first flexible circuit film D-FCB1. The second driver chip DIC2 may be mounted on the second flexible circuit film D-FCB2. The third driver chip DIC3 may be mounted on the third flexible circuit film D-FCB3. However, the present disclosure is not limited thereto. For another example, the display panel DP may be electrically connected to the main circuit board MCB through one flexible circuit film, and only one driver chip may be mounted on the one flexible circuit film. In addition, the display panel DP may be electrically connected to the main circuit board MCB through four or more flexible circuit films, and driver chips may be mounted on the flexible circuit films, respectively.

[0073] exist Figure 2 , respectively, a structure in which the first driver chip DIC1, the second driver chip DIC2, and the third driver chip DIC3 are mounted on the first flexible circuit film D-FCB1, the second flexible circuit film D-FCB2, and the third flexible circuit film D-FCB3 is shown, but the present disclosure is not limited thereto. For another example, the first driver chip DIC1, the second driver chip DIC2, and the third driver chip DIC3 may be directly mounted on the display panel DP. In this case, a portion of the display panel DP on which the first driver chip DIC1, the second driver chip DIC2, and the third driver chip DIC3 are mounted may be bent so that the first driver chip DIC1, the second driver chip DIC2, and the third driver chip DIC3 are disposed on the rear surface of the display module DM. In addition, the first driver chip DIC1, the second driver chip DIC2, and the third driver chip DIC3 may be directly mounted on the main circuit board MCB.

[0074] The input sensing layer ISP may be electrically connected to the main circuit board MCB through the display panel DP and the flexible circuit film D-FCB. However, the present disclosure is not limited thereto. That is, in another embodiment, the display device DD may further include a separate flexible circuit film for electrically connecting the input sensing layer ISP and the main circuit board MCB.

[0075] The display device DD also includes a housing EDC that accommodates the display module DM. The housing EDC can be coupled to the window WM to define the exterior of the display device DD. The housing EDC can absorb impacts from the outside and can prevent foreign matter or moisture, etc. from penetrating into the display module DM to protect the components accommodated in the housing EDC. Meanwhile, as an example of the present disclosure, the housing EDC can be implemented by coupling a plurality of accommodating members.

[0076] According to an embodiment, the display device DD may further include an electronic module, which includes various functional modules for operating the display module DM, a power module (e.g., a battery) for supplying power for the overall operation of the display device DD, a bracket coupled to the display module DM and / or the housing EDC to separate the internal space of the display device DD, and the like.

[0077] Figure 3 is a block diagram of a display device DD according to an embodiment of the present disclosure.

[0078] refer to Figure 3 , the display device DD includes a display panel DP, a driving controller 100, a data driving circuit 200, a voltage generator 300, and a scan driving circuit 400. In an embodiment, the driving controller 100, the data driving circuit 200, and the scan driving circuit 400 may be referred to as a driving circuit DC.

[0079] The driving controller 100 receives an input image signal I_RGB and a control signal CTRL. The driving controller 100 compensates the input image signal I_RGB to be suitable for the characteristics of the display panel DP and outputs an output image signal O_RGB. In addition, the driving controller 100 outputs a scan control signal SCS and a data control signal DCS.

[0080] The data driving circuit 200 receives the data control signal DCS and the output image signal O_RGB from the driving controller 100. The data driving circuit 200 converts the output image signal O_RGB into a data signal and outputs the data signal to a plurality of data lines DL1, DL2, ... and DLm to be described later. The data signal refers to an analog voltage corresponding to the grayscale value of the output image signal O_RGB.

[0081] The display panel DP includes first scan lines SCL1, SCL2, SCL3, ... and SCLn, second scan lines SSL1, SSL2, SSL3, ... and SSLn, data lines DL1 to DLm and pixels PX, where m and n are each positive integers. The display panel DP may further include a scan drive circuit 400. In an embodiment, the scan drive circuit 400 may be disposed on a first side of the display panel DP. The first scan lines SCL1 to SCLn and the second scan lines SSL1 to SSLn extend from the scan drive circuit 400 in a first direction DR1.

[0082] The driving controller 100 , the data driving circuit 200 , and the scan driving circuit 400 may constitute a driving circuit DC for providing data signals and scan signals to the pixels PX of the display panel DP.

[0083] The display panel DP may be divided into an active area AA and a non-active area NAA. The pixels PX may be disposed in the active area AA, and the scan driving circuit 400 may be disposed in the non-active area NAA.

[0084] The first scan lines SCL1 to SCLn and the second scan lines SSL1 to SSLn are arranged to be spaced apart from each other in the second direction DR2. The data lines DL1 to DLm extend from the data driving circuit 200 in the second direction DR2 and are arranged to be spaced apart from each other in the first direction DR1.

[0085] The pixels PX are electrically connected to the first scan lines SCL1 to SCLn, the second scan lines SSL1 to SSLn, and the data lines DL1 to DLm. In an embodiment, for example, the pixels PX belonging to the first row may be connected to the scan lines SCL1 and SSL1. In addition, the pixels PX belonging to the second row may be connected to the scan lines SCL2 and SSL2.

[0086] Each of the pixels PX includes a light emitting element ED (refer to Figure 4 ) and a pixel circuit PXC (reference Figure 4 ). The pixel circuit PXC may include a plurality of transistors and capacitors. The scan driving circuit 400 may include transistors formed by the same process as the pixel circuit PXC.

[0087] Each of the pixels PX receives a first voltage ELVDD, a second voltage ELVSS, and an initialization voltage VINT.

[0088] The scan driving circuit 400 receives a scan control signal SCS from the driving controller 100. In response to the scan control signal SCS, the scan driving circuit 400 may output a first scan signal to the first scan lines SCL1 to SCLn and may output a second scan signal to the second scan lines SSL1 to SSLn.

[0089] In an embodiment, the scan driving circuit 400 is disposed on the first side of the active area AA, but the present disclosure is not limited thereto. In another embodiment, the scan driving circuit may be disposed on the first side and the second side of the active area AA, respectively. In an embodiment, for example, the scan driving circuit 400 disposed on the first side of the active area AA may provide a first scan signal to the first scan lines SCL1 to SCLn, and the scan driving circuit disposed on the second side of the active area AA may provide a second scan signal to the second scan lines SSL1 to SSLn.

[0090] The voltage generator 300 generates voltages for the operation of the display panel DP. In an embodiment, the voltage generator 300 generates a first voltage ELVDD, a second voltage ELVSS, and an initialization voltage VINT for the operation of the display panel DP. In addition to the first voltage ELVDD, the second voltage ELVSS, and the initialization voltage VINT, the voltage generator 300 may also generate various voltages for the operation of the display panel DP and the scan driving circuit 400. In an embodiment, for example, the voltage generator 300 may generate a first driving voltage Vinit and a second driving voltage VGMA for the operation of the driving controller 100 and the data driving circuit 200.

[0091] Figure 4 is an equivalent circuit diagram of a pixel PX according to an embodiment of the present disclosure.

[0092] refer to Figure 4 , also refer to Figure 3 , Figure 4 shows the connection to the data lines DL1 to DLm (reference Figure 3 ), the i-th data line DLi (hereinafter also referred to as the data line DLi, where i is a positive integer less than or equal to m), the first scan lines SCL1 to SCLn (reference Figure 3 ), and the j-th first scan line SCLj (hereinafter also referred to as the first scan line SCLj, where j is a positive integer less than or equal to n), and the second scan lines SSL1 to SSLn (reference Figure 3 ) is an equivalent circuit diagram of a pixel PX of the j-th second scan line SSLj (also referred to as the second scan line SSLj hereinafter).

[0093] Figure 3 Each of the pixels PX shown in FIG. Figure 4 The pixels PX shown in FIG. 1 have the same circuit configuration. In an embodiment, the pixel PX includes at least one light emitting element ED and a pixel circuit PXC.

[0094] The pixel circuit PXC may be connected to the light emitting element ED and may provide the light emitting element ED with a current corresponding to the data signal Di transmitted from the data line DLi. In an embodiment, the pixel circuit PXC of the pixel PX includes a first transistor TR1, a second transistor TR2, a third transistor TR3, and a capacitor Cst. In an embodiment, each of the first transistor TR1 to the third transistor TR3 may be an N-type transistor using an oxide semiconductor as a semiconductor layer. However, the present disclosure is not limited thereto. In another embodiment, each of the first transistor TR1 to the third transistor TR3 may be a P-type transistor having a low temperature polycrystalline silicon ("LTPS") semiconductor layer. In an embodiment, at least one of the first transistor TR1 to the third transistor TR3 may be an N-type transistor, and the other transistors of the first transistor TR1 to the third transistor TR3 may be P-type transistors. In addition, the circuit configuration of the pixel circuit PXC according to the present disclosure is not limited to Figure 4 Embodiment of the invention. Figure 4 The pixel circuit PXC shown in FIG. 1 is provided only as an example, and the configuration of the pixel circuit PXC may be modified and implemented.

[0095] refer to Figure 4 The first scan line SCLj may transmit a first scan signal SCj, and the second scan line SSLj may transmit a second scan signal SSj. The data line DLi transmits a data signal Di. The data signal Di may have a signal similar to that input to the display device DD (reference signal). Figure 1 )'s input image signal I_RGB corresponding to the voltage level.

[0096] Figure 3 The display panel DP shown in FIG. 1 may include a first voltage line VL1, a second voltage line VL2, and a third voltage line VL3. The first voltage line VL1 and the third voltage line VL3 may transmit a first voltage ELVDD and an initialization voltage VINT to the pixel circuit PXC, respectively, and the second voltage line VL2 may transmit a second voltage ELVSS to the cathode (or the second terminal) of the light emitting element ED. The third voltage line VL3 may be an initialization voltage line that transmits the initialization voltage VINT to the pixel circuit PXC.

[0097] The first transistor TR1 includes a first electrode (or drain electrode) connected to the first voltage line VL1, a second electrode (or source electrode) electrically connected to the anode (or first terminal) of the light emitting element ED, and a gate electrode connected to the first end of the capacitor Cst. The first transistor TR1 can supply a driving current to the light emitting element ED in response to a data signal Di transmitted through the data line DLi depending on a switching operation of the second transistor TR2.

[0098] The second transistor TR2 includes a first electrode connected to the data line DLi, a second electrode connected to the gate electrode of the first transistor TR1, and a gate electrode connected to the first scan line SCLj. The second transistor TR2 may be turned on depending on a first scan signal SCj transmitted through the first scan line SCLj and may transmit a data signal Di from the data line DLi to the gate electrode of the first transistor TR1.

[0099] The third transistor TR3 includes a first electrode connected to the third voltage line VL3, a second electrode connected to the anode of the light emitting element ED, and a gate electrode connected to the second scan line SSLj. The third transistor TR3 may be turned on depending on the second scan signal SSj transmitted through the second scan line SSLj and may transmit the initialization voltage VINT to the anode of the light emitting element ED.

[0100] As described above, the first end of the capacitor Cst is connected to the gate electrode of the first transistor TR1, and the second end of the capacitor Cst is connected to the second electrode of the first transistor TR1. Figure 4 In the embodiment, for example, in one pixel PX, various changes or modifications may be made to the number of transistors, the number of capacitors, and their connection relationship.

[0101] Figure 5 is a diagram for describing a method for sensing and compensating for characteristics of the display panel DP in a manufacturing process.

[0102] refer to Figure 3 and Figure 5 , the characteristics of each pixel PX in the display panel DP may be different due to process differences. In the manufacturing step, the driving circuit DC senses the characteristics of the pixel PX in the display panel DP and calculates the compensation value according to the sensed characteristics. The compensation value may be stored in the driving controller 100 in the driving circuit DC. The driving controller 100 may compensate the input image signal I_RGB based on the preset compensation value and may output the output image signal O_RGB.

[0103] Various voltages should be provided to the driving circuit DC and the display panel DP to sense the characteristics of the pixel PX of the display panel DP. In an embodiment, for example, the first voltage ELVDD, the second voltage ELVSS and the initialization voltage VINT should be provided to the display panel DP, and the first driving voltage Vinita and the second driving voltage VGMAa should be provided to the driving circuit DC.

[0104] In the manufacturing steps, such as Figure 2 As shown in , after the main circuit board MCB is coupled to the display panel DP, the voltage generated by the voltage generator 300 can be provided to the drive circuit DC and the display panel DP. However, in general, in order to improve the manufacturing speed, before the main circuit board MCB is coupled to the display panel DP, the characteristics of the pixels PX of the display panel DP are sensed by using the test-dedicated voltage generator T_VC. That is, the test-dedicated voltage generator T_VC provides voltages (e.g., the first voltage ELVDD, the second voltage ELVSS, the initialization voltage VINT, the first drive voltage Vinita, and the second drive voltage VGMAa) for the operation of the drive circuit DC and the display panel DP. In an embodiment, the second drive voltage VGMAa may include a plurality of drive voltages having different voltage levels.

[0105] In the manufacturing process, the driving controller 100 in the driving circuit DC may store information about the voltage level of each of the first driving voltage Vinita and the second driving voltage VGMAa provided from the test-dedicated voltage generator T_VC.

[0106] Figure 6 is a diagram for describing a method for sensing and compensating for characteristics of a display panel DP in a display device DD in which a manufacturing process is completed.

[0107] refer to Figure 3 and Figure 6 , the display device DD whose manufacturing process is completed is provided with voltages (e.g., the first voltage ELVDD, the second voltage ELVSS, the initialization voltage VINT, the first driving voltage Vinit, and the second driving voltage VGMA) provided from the voltage generator 300. In an embodiment, the second driving voltage VGMA may include a plurality of driving voltages having different voltage levels.

[0108] In an embodiment, by Figure 5 The voltage levels of the first driving voltage Vinita and the second driving voltage VGMAa generated by the test-dedicated voltage generator T_VC shown in FIG. 1 may be different from those of the first driving voltage Vinita and the second driving voltage VGMAa generated by the test-dedicated voltage generator T_VC shown in FIG. Figure 6 The voltage levels of the first driving voltage Vinit and the second driving voltage VGMA generated by the voltage generator 300 are shown in FIG.

[0109] return Figure 4 , the pixel PX can operate in the emission mode and the sensing mode. In the emission mode, when the third transistor TR3 is turned on, the initialization voltage VINT provided from the third voltage line VL3 can be transmitted to the anode of the light emitting element ED.

[0110] In the sensing mode, when the third transistor TR3 is turned on after the data signal Di is provided through the data line DLi, the voltage of the anode of the light emitting element ED can be provided to the sensing circuit (not shown) through the third voltage line VL3. That is, the voltage of the anode of the light emitting element ED corresponding to the data signal Di can be fed back to the sensing circuit as a sensing voltage.

[0111] In the manufacturing step, when Figure 5 When the test-dedicated voltage generator T_VC shown in provides the first voltage ELVDD, the second voltage ELVSS, the initialization voltage VINT, the first driving voltage Vinita and the second driving voltage VGMAa to the display panel DP, the sensing circuit can sense the characteristics of the pixel PX based on the difference between the fed-back sensing voltage and the voltage of the data signal Di provided to the pixel PX.

[0112] In an embodiment, the first driving voltage Vinit and the second driving voltage VGMA may be reference voltages for causing the data driving circuit 200 to output the data signal Di corresponding to the output image signal O_RGB.

[0113] The characteristic of the pixel PX may be sensed based on the difference between the fed-back sensing voltage and the voltage of the data signal Di supplied to the pixel PX, and the driving controller 100 may output the output image signal O_RGB obtained by compensating the input image signal I_RGB depending on the sensed characteristic. In the following description, the operation of compensating the input image signal I_RGB based on the difference between the fed-back sensing voltage and the voltage of the data signal Di supplied to the pixel PX is referred to as "sensing compensation".

[0114] Figure 7 is a diagram illustrating an inspection process for optical compensation associated with the display panel DP in a manufacturing process.

[0115] refer to Figure 7 , also refer to Figure 3 The camera CAM may capture an image displayed in the display panel DP and provide a sensing image signal IMS to the inspection device TD. The inspection device TD outputs an information signal CP_DATA associated with the characteristics of the display panel DP based on the sensing image signal IMS provided from the camera CAM. The information signal CP_DATA output from the inspection device TD may be stored in the drive controller 100 (refer to FIG. 1 ) of the display device DD. Figure 3). The driving controller 100 may perform optical compensation on the input image signal I_RGB based on the information signal CP_DATA and may output the output image signal O_RGB. In the following description, compensation of the input image signal I_RGB based on the image obtained by the camera CAM is referred to as "optical compensation". Optical compensation may be performed to compensate for color characteristic variations between gray levels of the data signal provided to the display panel DP. That is, optical compensation may refer to compensation for light spots (or spots) of an image displayed by a data signal of the same gray level. In other words, optical compensation means compensation for improved color uniformity in the image displayed in the display panel DP. This may be performed by Figure 5 The inspection process is performed while the test-dedicated voltage generator T_VC shown in FIG. 1 supplies the first voltage ELVDD, the second voltage ELVSS, the initialization voltage VINT, the first driving voltage Vinita, and the second driving voltage VGMAa to the display panel DP.

[0116] Fig. 8A is a diagram showing the gamma characteristic of the display panel DP.

[0117] exist Fig. 8A In the example, the first gamma characteristic curve CV1 indicates that Figure 5 The gamma characteristic of the display panel DP is displayed when the voltage generated by the test-dedicated voltage generator T_VC shown in FIG. 1 is supplied to the display panel DP.

[0118] exist Fig. 8A In the example, the second gamma characteristic curve CV2 indicates that Figure 2 , a gamma characteristic of the display panel DP is shown in FIG. 1 when a voltage supplied from the voltage generator 300 is supplied to the display panel DP after the main circuit board MCB is coupled to the display panel DP.

[0119] When from Figure 5 The voltage level of the voltage output by the test-specific voltage generator T_VC shown in FIG. 1 is the same as that of the voltage output by the test-specific voltage generator T_VC. Figure 6 When the voltage levels of the voltages provided by the voltage generator 300 shown in FIG. 1 are completely consistent, the first gamma characteristic curve CV1 and the second gamma characteristic curve CV2 may be consistent with each other.

[0120] However, when from Figure 5 The voltage level of the voltage output by the test-specific voltage generator T_VC shown in FIG. 1 is the same as that of the voltage output by the test-specific voltage generator T_VC. Figure 6 When the voltage levels of the voltages provided by the voltage generator 300 shown in FIG. 1 are not completely consistent, as shown in FIG. Fig. 8AAs shown in FIG. 3 , the first gamma characteristic curve CV1 and the second gamma characteristic curve CV2 are inconsistent with each other. Due to the characteristic difference between the test-dedicated voltage generator T_VC and the voltage generator 300 , the first gamma characteristic curve CV1 and the second gamma characteristic curve CV2 may be inconsistent with each other.

[0121] While supplying the voltage from the test-dedicated voltage generator T_VC, the drive circuit DC (reference Figure 5 ) may perform sensing compensation so that most gray levels displayed in the display panel DP are consistent with gamma 2.2 (ie, so that the display panel DP has the characteristics of the first gamma characteristic curve CV1). Figure 5 The voltage level provided by the test-specific voltage generator T_VC shown in FIG. 1 is the same as that provided by the test-specific voltage generator T_VC. Figure 6 When the voltage level of the voltage provided by the voltage generator 300 shown in FIG. 1 is different, the gamma characteristic of the display panel DP may be changed to the second gamma characteristic curve CV2. The above gamma characteristic shift of the display panel DP may reduce the quality of the image of the display device DD.

[0122] Figure 8B : is a diagram showing the brightness characteristics of the display panel DP.

[0123] exist Figure 8B In the example, the first brightness characteristic curve CV3 indicates that when Figure 5 The luminance characteristics of the display panel DP when the voltage generated by the test-dedicated voltage generator T_VC shown in FIG. 1 is supplied to the display panel DP.

[0124] exist Figure 8B In the example, the second brightness characteristic curve CV4 indicates that when Figure 2 , a luminance characteristic of the display panel DP when a voltage supplied from the voltage generator 300 is supplied to the display panel DP after the main circuit board MCB is coupled to the display panel DP.

[0125] When from Figure 5 The voltage level of the voltage output by the test-specific voltage generator T_VC shown in FIG. 1 is the same as that of the voltage output by the test-specific voltage generator T_VC. Figure 6 When the voltage levels of the voltages provided by the voltage generator 300 shown in FIG. 1 are completely consistent, the first brightness characteristic curve CV3 and the second brightness characteristic curve CV4 may be consistent with each other.

[0126] However, when Figure 5 The voltage level of the voltage output by the test-specific voltage generator T_VC shown in FIG. 1 is the same as that of the voltage output by the test-specific voltage generator T_VC. Figure 6 When the voltage levels of the voltages provided by the voltage generator 300 shown in FIG. 1 are not completely consistent, as shown in FIG. Figure 8BAs shown in FIG. 1 , the first brightness characteristic curve CV3 and the second brightness characteristic curve CV4 are inconsistent with each other. In an embodiment, due to the characteristic difference between the test-dedicated voltage generator T_VC and the voltage generator 300 , the first brightness characteristic curve CV3 and the second brightness characteristic curve CV4 may be inconsistent with each other.

[0127] When the voltage from the test-dedicated voltage generator T_VC is supplied, the drive circuit DC (reference Figure 5 ) can perform optical compensation so that the brightness of most gray levels displayed in the display panel DP is uniform (that is, so that the display panel DP has the characteristics of the first brightness characteristic curve CV3). Figure 5 The voltage level provided by the test-specific voltage generator T_VC shown in FIG. 1 is different from that provided by the test-specific voltage generator T_VC. Figure 6 When the voltage level of the voltage provided by the voltage generator 300 shown in , the brightness characteristic of the display panel DP may be changed to the second brightness characteristic curve CV4. The above brightness characteristic deviation of the display panel DP may reduce the quality of the image of the display device DD.

[0128] Fig.9A It is shown from Figure 5 FIG. 5 is a diagram of a second driving voltage VGMAa output by the test-dedicated voltage generator T_VC shown in FIG.

[0129] refer to Figure 5 and Fig.9A , the second driving voltage VGMAa outputted from the test-dedicated voltage generator T_VC includes second driving voltages VGMA1a, VGMA2a, VGMA3a, and VGMA4a. The second driving voltages VGMA1a, VGMA2a, VGMA3a, and VGMA4a have different voltage levels. In an embodiment, for example, the second driving voltages VGMA1a and VGMA2a have a voltage difference a1, the second driving voltages VGMA1a and VGMA3a have a voltage difference a2, and the second driving voltages VGMA1a and VGMA4a have a voltage difference a3. Fig.9A Only four second driving voltages VGMA1a, VGMA2a, VGMA3a, and VGMA4a are shown in FIG. 1 , but the number of the second driving voltages is not limited thereto.

[0130] Figure 3 The data driving circuit 200 shown in FIG. 1 converts the output image signal O_RGB into a data signal based on the second driving voltages VGMA1a, VGMA2a, VGMA3a, and VGMA4a. The data signal may be provided to a plurality of data lines DL1 to DLm.

[0131] When the second driving voltages VGMA1a, VGMA2a, VGMA3a, and VGMA4a are supplied from the test-dedicated voltage generator T_VC, Figure 3 The driving controller 100 shown in FIG. 1 performs sensing compensation and optical compensation and generates a sensing compensation value for sensing compensation and an optical compensation value for optical compensation.

[0132] Fig. 9B It is shown from Figure 6 FIG. 4 is a diagram of a second driving voltage VGMA output by the voltage generator 300 shown in FIG.

[0133] refer to Figure 6 and Fig. 9B , the second driving voltage VGMA outputted from the voltage generator 300 includes second driving voltages VGMA1b, VGMA2b, VGMA3b, and VGMA4b. The second driving voltages VGMA1b, VGMA2b, VGMA3b, and VGMA4b have different voltage levels. In an embodiment, for example, the second driving voltages VGMA1b and VGMA2b have a voltage difference b1 therebetween, the second driving voltages VGMA1b and VGMA3b have a voltage difference b2 therebetween, and the second driving voltages VGMA1b and VGMA4b have a voltage difference b3 therebetween. Fig. 9B Only four second driving voltages VGMA1b, VGMA2b, VGMA3b, and VGMA4b are shown in FIG. 1 , but the number of the second driving voltages is not limited thereto.

[0134] Figure 3 The data driving circuit 200 shown in FIG. 1 converts the output image signal O_RGB into a data signal based on the second driving voltages VGMA1b, VGMA2b, VGMA3b, and VGMA4b. The data signal may be provided to a plurality of data lines DL1 to DLm.

[0135] Fig. 9C Is used for comparison Fig.9A The second driving voltage VGMAa shown in FIG. Fig. 9B Graph of the second driving voltage VGMA shown in .

[0136] refer to Figure 5 , Figure 6 and Fig. 9CEach of the test-dedicated voltage generator T_VC and the voltage generator 300 may be implemented with an integrated circuit (“IC”). Due to process errors of the test-dedicated voltage generator T_VC and the voltage generator 300, there may be a voltage difference between the second driving voltages VGMA1a, VGMA2a, VGMA3a, and VGMA4a generated by the test-dedicated voltage generator T_VC and the second driving voltages VGMA1b, VGMA2b, VGMA3b, and VGMA4b generated by the voltage generator 300.

[0137] In an embodiment, for example, a voltage difference between the second driving voltages VGMA2a and VGMA2b may be d1, a voltage difference between the second driving voltages VGMA3a and VGMA3b may be d2, and a voltage difference between the second driving voltages VGMA4a and VGMA4b may be d3.

[0138] The voltage differences d1, d2 and d3 result in Fig. 8A The above-mentioned gamma characteristic shift of the display panel DP may degrade the quality of the image of the display device DD.

[0139] Fig.10 is a block diagram of a driving controller 100 according to an embodiment of the present disclosure.

[0140] like Fig.10 As shown in , the driving controller 100 includes an image correction unit 110 and a control unit 120 .

[0141] The voltage generator 300 generates a first driving voltage Vinit and a second driving voltage VGMA.

[0142] The control unit 120 outputs a first error correction value SE for error correction of sensing compensation and a second error correction value LE for error correction of optical compensation based on voltage level information of the first driving voltage Vinit and the second driving voltage VGMA from the voltage generator 300 .

[0143] The image correction unit 110 receives the input image signal I_RGB and outputs the compensated image signal to be compatible with the display panel DP (see Figure 3 ). In an embodiment, the image correction unit 110 may output the output image signal O_RGB obtained by compensating the input image signal I_RGB based on the first error correction value SE and the second error correction value LE.

[0144] Fig.11 is a flowchart for describing the operation of the display device according to an embodiment of the present disclosure.

[0145] refer to Fig.10 and Fig.11 , also refer to Figure 3 and Figure 5 , the control unit 120 receives information about the voltage levels of the first driving voltage Vinit and the second driving voltage VGMA from the voltage generator 300. In an embodiment, the information about the voltage levels of the first driving voltage Vinit and the second driving voltage VGMA may be in the form of a digital signal.

[0146] The control unit 120 converts the pre-stored voltage into the voltage generated by the test-specific voltage generator T_VC (reference Figure 5 ) and the information about the voltage levels of the first driving voltage Vinit and the second driving voltage VGMAa provided from the voltage generator 300, thereby determining whether the pre-stored voltage information is consistent with the voltage information of the voltage generator 300? (S100).

[0147] When the pre-stored information about the voltage levels of the first driving voltage Vinit and the second driving voltage VGMAa generated by the test-dedicated voltage generator T_VC is consistent with the information about the voltage levels of the first driving voltage Vinit and the second driving voltage VGMA provided from the voltage generator 300, the control unit 120 may provide the first error correction value SE and the second error correction value LE to the image correction unit 110. In an embodiment, each of the first error correction value SE and the second error correction value LE may be "0".

[0148] The image correction unit 110 may output an output image signal O_RGB obtained by compensating the input image signal I_RGB based on the first and second error correction values ​​SE and LE of given values ​​provided from the control unit 120, that is, the image correction unit 110 may output the corrected output image signal O_RGB (S150).

[0149] When the pre-stored information about the voltage levels of the first driving voltage Vinit and the second driving voltage VGMAa generated by the test-dedicated voltage generator T_VC and the information about the voltage levels of the first driving voltage Vinit and the second driving voltage VGMAa provided from the voltage generator 300 are inconsistent, the control unit 120 may determine whether there is a sensing compensation history indicating that the sensing compensation operation was previously performed, that is, the control unit 120 may determine: Is there a sensing compensation history? (S110).

[0150] When it is determined that there is a sensing compensation history, the control unit 120 determines whether the voltage difference can be compensated by sensing compensation (S120). In an embodiment, for example, when the difference between the voltage of the data signal Di provided to the pixel PX through the data line DLi in the sensing mode and the voltage fed back from the anode of the light emitting element ED to the third voltage line VL3 is less than a reference value, the control unit 120 may determine to compensate the voltage difference by sensing compensation.

[0151] When it is determined that the voltage difference is compensated by sensing compensation, the control unit 120 may provide a first error correction value SE having a given value to the image correction unit 110. In an embodiment, the first error correction value SE may be "0". When it is determined that the voltage difference is compensated by sensing compensation, error correction of the sensing compensation is not required.

[0152] In addition, when it is determined that the voltage difference is compensated by sensing compensation, the control unit 120 corrects the error of optical compensation (S130). In an embodiment, the control unit 120 may be based on: 1) a test-specific voltage generator T_VC (reference voltage generator 120) pre-stored before the first driving voltage Vinit is provided from the voltage generator 300; Figure 5 ) a difference between the first driving voltage Vinita and the first driving voltage Vinit provided from the voltage generator 300 and 2) a test-specific voltage generator T_VC (reference voltage) pre-stored before the second driving voltage VGMA is provided from the voltage generator 300 Figure 5 ) and the second driving voltage VGMA provided from the voltage generator 300 to output a second error correction value LE for error correction of optical compensation.

[0153] The image correction unit 110 may output an output image signal O_RGB obtained by compensating the input image signal I_RGB based on the first error correction value SE and the second error correction value LE provided from the control unit 120 .

[0154] When it is determined in operation S110 that there is no sensing compensation history or when it is determined in operation S120 that the voltage difference cannot be compensated by sensing compensation, the control unit 120 outputs both the first error correction value SE for error correction of sensing compensation and the second error correction value LE for error correction of optical compensation, that is, the control unit 120 corrects the error of sensing compensation and corrects the error of optical compensation (S140). In this case, the first error correction value SE and the second error correction value LE may be based on 1) a test-specific voltage generator T_VC (reference voltage) pre-stored before the first driving voltage Vinit is provided from the voltage generator 300 Figure 5) a difference between the first driving voltage Vinita and the first driving voltage Vinit provided from the voltage generator 300 and 2) a test-specific voltage generator T_VC (reference voltage) pre-stored before the second driving voltage VGMA is provided from the voltage generator 300 Figure 5 ) is calculated by the difference between the second driving voltage VGMAa of FIG. 1 and the second driving voltage VGMA provided from the voltage generator 300.

[0155] Therefore, it is possible to effectively prevent the quality of an image displayed in the display panel DP from being degraded due to the difference between the first and second driving voltages Vinit and VGMAa of the test-dedicated voltage generator T_VC and the first and second driving voltages Vinit and VGMA supplied from the voltage generator 300 .

[0156] Fig.12 is a block diagram of a driving controller 100 a according to another embodiment of the present disclosure.

[0157] refer to Fig.12 , the driving controller 100a includes an image correction unit 110a and a control unit 120a.

[0158] The voltage generator 300 generates a first driving voltage Vinit and a second driving voltage VGMA.

[0159] The control unit 120a outputs a first error correction value SE for error correction of sensing compensation and a second error correction value LE for error correction of optical compensation.

[0160] The control unit 120a outputs a voltage control signal VCTRL based on information about voltage levels of the first and second driving voltages Vinit and VGMA from the voltage generator 300. The voltage control signal VCTRL may be a signal for changing voltage levels of the first and second driving voltages Vinit and VGMA.

[0161] The voltage generator 300 may change voltage levels of the first driving voltage Vinit and the second driving voltage VGMA in response to the voltage control signal VCTRL.

[0162] Fig.13 is a block diagram of a driving controller 100 b according to yet another embodiment of the present disclosure.

[0163] refer to Fig.13 The driving controller 100b includes an image correction unit 110b, a control unit 120b and a voltage difference compensation lookup table (voltage difference compensation LUT) 130b.

[0164] The voltage generator 300 generates a first driving voltage Vinit and a second driving voltage VGMA.

[0165] The control unit 120b generates a test voltage generator T_VC (reference voltage) according to Figure 5 ) and the first driving voltage Vinit and the second driving voltage VGMAa provided from the voltage generator 300 to output the first error correction value SE and the second error correction value LE.

[0166] The image correction unit 110 b outputs an intermediate image signal RGB obtained by compensating the input image signal I_RGB.

[0167] The voltage difference compensation lookup table 130 b outputs an output image signal O_RGB obtained by compensating the intermediate image signal RGB based on the first error correction value SE and the second error correction value LE.

[0168] Fig.14 is a block diagram of a driving controller 100 c according to yet another embodiment of the present disclosure.

[0169] refer to Fig.14 , also refer to Figure 5 The driving controller 100c includes an image correction unit 110c, a control unit 120c and a voltage difference compensation lookup table (voltage difference compensation LUT) 130c.

[0170] The voltage generator 300 generates a first driving voltage Vinit and a second driving voltage VGMA.

[0171] The control unit 120c generates a test voltage generator T_VC (reference voltage) according to Figure 5 ) and the first driving voltage Vinit and the second driving voltage VGMAa provided from the voltage generator 300 to output the first error correction value SE and the second error correction value LE.

[0172] The image correction unit 110 c outputs an intermediate image signal RGB obtained by compensating the input image signal I_RGB.

[0173] The voltage difference compensation lookup table 130c outputs an output image signal O_RGB obtained by compensating the intermediate image signal RGB based on the first error correction value SE and the second error correction value LE. In an embodiment, the voltage difference compensation lookup table 130c can be implemented with a memory (eg, a flash memory or an electrically erasable programmable read-only memory (EEPROM)).

[0174] The control unit 120c outputs a voltage control signal VCTRL based on information about voltage levels of the first and second driving voltages Vinit and VGMA from the voltage generator 300. The voltage control signal VCTRL may be a signal for changing voltage levels of the first and second driving voltages Vinit and VGMA.

[0175] The voltage generator 300 may change voltage levels of the first driving voltage Vinit and the second driving voltage VGMA in response to the voltage control signal VCTRL.

[0176] In an embodiment, the control unit 120c may perform all of the following operations: generating the first error correction value SE and the second error correction value LE and generating the voltage control signal VCTRL based on information about the voltage levels of the first driving voltage Vinit and the second driving voltage VGMA from the voltage generator 300.

[0177] In the embodiment, for example, when the test dedicated voltage generator T_VC (reference Figure 5 ) and the first driving voltage Vinit provided from the voltage generator 300 is represented by 8 bits, the control unit 120c can compensate for "u" high bits (for example, 5 high bits) of the voltage difference by using the voltage control signal VCTRL and can compensate for "l" low bits (for example, 3 low bits) of the voltage difference by using the first error correction value SE and the second error correction value LE.

[0178] In addition, when testing the dedicated voltage generator T_VC (reference Figure 5 ) and the second driving voltage VGMA provided from the voltage generator 300 is represented by 8 bits, the control unit 120c can compensate for "u" high bits (for example, 5 high bits) of the voltage difference by using the voltage control signal VCTRL and can compensate for "l" low bits (for example, 3 low bits) of the voltage difference by using the first error correction value SE and the second error correction value LE.

[0179] That is, the control unit 120c may combine macro compensation for changing the voltage levels of the first driving voltage Vinit and the second driving voltage VGMA generated by the voltage generator 300 with micro compensation using the voltage difference compensation lookup table 130c, thereby improving the accuracy of the voltage difference compensation.

[0180] The display device having the above configuration includes a voltage generator that generates a voltage for operation of a display panel. The drive controller of the display device is configured to compensate an image signal based on a voltage generated by a test-dedicated voltage generator in a manufacturing step so as to correspond to the characteristics of the display panel. Information of a voltage generated from the voltage generator after the display device is fully manufactured may be different from information of a voltage set in the drive controller of the display device. In this case, an error of sensing compensation and an error of optical compensation may be corrected to correspond to a voltage generated from a voltage generator provided in the display device.

[0181] Therefore, the display quality of the display device can be improved while minimizing the manufacturing time.

[0182] While the present disclosure has been described with reference to the embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made thereto without departing from the spirit and scope of the present disclosure as set forth in the appended claims.

Claims

1. A display device, in, The display device comprises: A display panel, including pixels; a voltage generator configured to generate a driving voltage for operation of the display panel; and a driving controller configured to receive an input image signal and output an output image signal obtained by compensating the input image signal based on a characteristic of the display panel, Wherein, the drive controller comprises: a control unit configured to output an error correction value corresponding to a voltage difference between a voltage level of the driving voltage supplied from the voltage generator and a voltage level pre-stored in the control unit when the driving voltage is supplied from the voltage generator; and The image correction unit is configured to convert the input image signal into the output image signal based on the error correction value.

2. The display device according to claim 1, in, The error correction value includes a first error correction value for error correction of sensing compensation and a second error correction value for error correction of optical compensation.

3. The display device according to claim 2, in, The sensing compensation compensates for a voltage difference between a voltage of a data signal provided to the pixel and a sensing voltage fed back from the pixel.

4. The display device according to claim 2, in, The display device further includes: The data driving circuit is configured to convert the output image signal into a data signal based on the driving voltage and provide the data signal to the pixel.

5. The display device according to claim 4, in, The optical compensation compensates for a change in color characteristics between gray levels of the data signal provided to the display panel.

6. The display device according to claim 1, in, The control unit also outputs a voltage control signal for changing the voltage level of the driving voltage.

7. The display device according to claim 6, in, The voltage generator changes the voltage level of the driving voltage in response to the voltage control signal.

8. The display device according to claim 1, in, The voltage level pre-stored in the control unit is a voltage level of a driving voltage generated by a test-dedicated voltage generator used in a manufacturing process.

9. A display device, in, The display device comprises: A display panel, including pixels; a voltage generator configured to generate a driving voltage for operation of the display panel; and a driving controller configured to receive an input image signal and output an output image signal obtained by compensating the input image signal based on a characteristic of the display panel, Wherein, the drive controller comprises: a control unit configured to output an error correction value corresponding to a voltage difference between a voltage level of the driving voltage supplied from the voltage generator and a voltage level pre-stored in the control unit when the driving voltage is supplied from the voltage generator; an image correction unit configured to output an intermediate image signal obtained by compensating the input image signal based on the characteristic of the display panel; and A voltage difference compensation lookup table is configured to convert the intermediate image signal into the output image signal based on the error correction value.

10. The display device according to claim 9, in, The error correction value includes a first error correction value for error correction of sensing compensation and a second error correction value for error correction of optical compensation.

Images