Display device

Abstract

A display apparatus can include a plurality of driving blocks located on a display panel; a driving circuit to drive the plurality of driving blocks; and a controller to control the driving circuit to drive the plurality of driving blocks. The plurality of driving blocks can include a plurality of light emitting elements included in each of a plurality of sub-pixels; and a micro-IC commonly connected to the plurality of light emitting elements to cause the plurality of light emitting elements to emit light. The controller can control the driving circuit to adjust a reference current sensed by each of the plurality of micro-ICs based on a target current when the reference current is sensed by each of the plurality of micro-ICs.

Description

Technical Field

[0001] The embodiment relates to a display device. Background Technology

[0002] The monitor market is growing, and its applications are expanding. As applications broaden, product resolutions and features are becoming increasingly diverse.

[0003] As product specifications become more diverse, the methods for driving displays also become more complex.

[0004] Driver ICs (integrated circuits) used to drive display devices must be designed accordingly. Therefore, since the application scope of the design is limited, each product may require a corresponding driver IC.

[0005] In existing display devices, various methods are used to ensure brightness uniformity. For example, light-emitting circuits are constructed at the pixel (or sub-pixel) and internal compensation is performed, or external compensation is performed in a specific manner.

[0006] On the one hand, most circuit structures used for the operation of light-emitting circuits have their own capacitors inside the light-emitting circuits, ensuring constant current characteristics.

[0007] Figure 1 This is a circuit diagram illustrating an existing light-emitting circuit.

[0008] like Figure 1 As shown, the existing light-emitting circuit includes a driving transistor M1, a scanning transistor M2, a sensing transistor M3, and a capacitor CSTG.

[0009] When the scanning transistor M2 is turned on in response to the scanning signal SCAN, the data signal VDATA is supplied to the driving transistor M1 through the scanning transistor M2. The driving transistor M1 supplies the light-emitting current corresponding to the data signal VDATA to the light-emitting element ED, causing the light-emitting element ED to emit light.

[0010] The capacitor CSTG supplies the luminous current to the light-emitting element ED at a constant current.

[0011] When sensing transistor M3 is turned on in response to sensing control signal SEN, the light-emitting current flowing in driving transistor M1 is detected in the form of detection signal VSEN. The detection signal VSEN is used to calibrate or compensate the characteristics of the light-emitting circuit.

[0012] On the other hand, the light-emitting circuit of an active matrix display device adjusts brightness using either PWM (pulse width modulation) or a PWM method using PAM (pulse amplitude modulation). In this case, all pixels (or sub-pixels) must contain capacitors.

[0013] If the light-emitting circuit is designed so that all pixels have capacitors inside, then limitations such as area may arise, or other additional problems may arise due to the capacitors inside each pixel. Summary of the Invention

[0014] Technical problems to be solved Another objective of the embodiments is to provide a display device with a novel structure.

[0015] Another objective of the embodiments is to provide a display device capable of providing a new driving method.

[0016] Another objective of the embodiments is to provide a display device in which the light-emitting circuit does not have a capacitor.

[0017] Another objective of this embodiment is to provide a display device that does not require a display driver circuit that includes a converter for converting digital data into analog data.

[0018] Another objective of the embodiments is to provide a display device capable of efficiently sensing reference current and / or luminous current.

[0019] Another objective of this embodiment is to provide a display device that simplifies the circuit structure by using a single sensing line.

[0020] Another objective of the embodiments is to provide a display device capable of ensuring the uniformity of luminous current, i.e., luminance uniformity, between displays (or frames) or blocks.

[0021] The technical problems of the embodiments are not limited to those described herein, but include those that can be understood from the inventive content.

[0022] Technical solution To achieve the above or other objectives, according to one aspect of an embodiment, a display device includes: a plurality of driving blocks on a display panel; a driving circuit for driving the plurality of driving blocks; and a controller for controlling the driving circuit to drive the plurality of driving blocks, each of the plurality of driving blocks including: a plurality of light-emitting elements included in a plurality of sub-pixels; and a micro-integrated circuit (MIC) commonly connected to the plurality of light-emitting elements and causing the plurality of light-emitting elements to emit light, the micro-IC including: a reference current generating circuit for generating a reference current; and a plurality of light-emitting circuits connected to the plurality of light-emitting elements, each of the plurality of light-emitting circuits generating a light-emitting current based on the reference current to cause the plurality of light-emitting elements to emit light, the controller controlling the driving circuit to adjust the sensed reference current based on a target current when each of the plurality of micro-ICs senses the reference current.

[0023] The controller can control the drive circuit to adjust the reference current based on the target current when each of the plurality of microICs senses a representative light-emitting current.

[0024] The controller can control the drive circuit to increase the reference current among the plurality of reference currents of the plurality of microICs that is less than the target current.

[0025] The controller can control the drive circuit to reduce the reference currents among the plurality of reference currents of the plurality of microICs that are greater than the target current.

[0026] The controller can control the drive circuit to adjust the light emission time of each of the plurality of microICs in a single frame, while the reference currents of the plurality of microICs have been adjusted.

[0027] The emission time of a frame can be adjusted based on the minimum reference current or the minimum emission current.

[0028] The controller can control the drive circuit so that the product of the reference current and the emission time of the frame is the same at each of the plurality of microICs.

[0029] The sensed multiple reference currents or the sensed multiple representative luminous currents can be obtained between or within frames.

[0030] The controller can control the drive circuit to adjust the emission time of a frame by using the relationship information between the reference current and the emission current of each of the plurality of microICs.

[0031] The controller can control the drive circuit to adjust the emission time of a frame by using at least one bit of digital data that is redundant at least once.

[0032] Beneficial effects The effects of the display device according to the embodiment are explained below.

[0033] According to at least one embodiment, the light-emitting circuit does not have a capacitor, is not limited by area, and the increased aperture ratio can improve luminance.

[0034] According to at least one embodiment, a display driver device that does not require a converter to convert digital data into analog data can simplify the circuit structure, reduce the footprint, and lower costs.

[0035] According to at least one embodiment, the reference current (or luminous current) can be adjusted differently to eliminate brightness differences between multiple micro-ICs and improve image quality.

[0036] According to at least one embodiment, by adjusting the reference emission time differently during the emission time of a frame, it is possible to eliminate brightness differences between multiple micro ICs and improve image quality.

[0037] According to at least one embodiment, by adjusting the emission time of a frame using at least one bit of digital data that is redundant at least once, it is possible to eliminate brightness differences between multiple micro ICs and improve image quality.

[0038] The additional scope of applicability of the embodiments will become apparent from the following implementation. However, since those skilled in the art can clearly understand the ideas and various changes and modifications within the scope of the embodiments, it should be understood that specific embodiments, such as the summary of the invention and preferred embodiments, are presented by way of example only. Attached Figure Description

[0039] Figure 1 This is a circuit diagram illustrating an existing light-emitting circuit.

[0040] Figure 2 A block diagram illustrating a display device according to a first embodiment.

[0041] Figure 3 A display panel according to an embodiment is shown.

[0042] Figure 4 A block diagram illustrating a driver block according to an embodiment.

[0043] Figure 5 A block diagram illustrating a display device according to a second embodiment.

[0044] Figure 6 A circuit diagram of a microIC according to an embodiment is shown.

[0045] Figure 7The programmable signal of a frame according to the first embodiment is shown.

[0046] Figure 8 The programming signal of a frame according to the second embodiment is shown.

[0047] Figure 9 The distribution of multiple micro-ICs based on the luminous current is shown in the embodiment.

[0048] Figure 10 The embodiment shows the state of adjusting the light-emitting current at multiple microICs.

[0049] Figure 11 The programming signal of one frame in the third embodiment is shown.

[0050] Figure 12 This illustrates a state in which uniform luminance is obtained by adjusting at least one of the reference current and the emission time of a frame.

[0051] The size, shape, and value of the constituent elements shown in the accompanying drawings may differ from the actual constituent elements. Furthermore, although the same constituent elements may be shown in different sizes, shapes, and values ​​across the drawings, this is merely an example; the same constituent elements may have the same size, shape, and value across the drawings. Detailed Implementation

[0052] Hereinafter, with reference to the accompanying drawings, the embodiments disclosed in this specification will be described in detail. However, regardless of the reference numerals, the same or similar components are given the same reference numerals, and repeated descriptions will be omitted. For ease of writing, the suffixes such as "module" and "section" used for the components described below are interchangeable and do not have a distinguishing meaning or function. Furthermore, the drawings are used to simply understand the embodiments described in this specification, and the technical ideas disclosed in this specification are not limited by the drawings. In addition, when it is mentioned that a component such as a layer, region, or substrate is located "on" another component, it means that the component can be directly located on the other component or there are other intermediate components between them.

[0053] In the following, "~module", "~part", etc. can be composed of "~circuit" or "integrated circuit". "~module", "~part", etc. can be used interchangeably with "~circuit" or "integrated circuit".

[0054] Figure 2 A block diagram illustrating a display device according to a first embodiment. Figure 3 A display panel according to an embodiment is shown.

[0055] Reference Figure 2The display device according to the first embodiment may include a controller 50, a driving circuit 30, a display panel 10, a current sensing circuit 40, etc.

[0056] Controller 50 can manage and / or control the display device as a whole. Controller 50 can be a timing controller. Controller 50 can be a data processor.

[0057] The controller 50 can control the drive circuit 30 to display images on the display panel 10.

[0058] The drive circuit 30 can drive the display panel 10 under the control of the controller 50. The drive circuit 30 can receive image data, control signals, etc. from the controller 50.

[0059] The driving circuit 30 can generate multiple digital data, multiple programming signals, control signals, etc., according to frames based on image data, control signals, etc., and transmit them to the display panel 10.

[0060] Multiple digital data may each include multiple light-emitting elements ( Figure 5 The signals related to the light emission / non-emission of the light-emitting elements (120-1 to 120-N) are as follows: For example, when the digital data is "1", the light-emitting current generated by the corresponding light-emitting circuit is supplied to the corresponding light-emitting element, and the corresponding light-emitting element can emit light. For example, when the digital data is "0", the light-emitting current generated by the corresponding light-emitting circuit is not supplied to the corresponding light-emitting element, and the corresponding light-emitting elements (120-1 to 120-N) do not emit light.

[0061] Multiple programming signals serve as control signals for writing input data to various light-emitting elements (120-1 to 120-N), and may include emission time information corresponding to specific grayscale levels. Based on the emission time information included in the programming signals, the width of the open interval (or emission interval) within a frame is determined differently; therefore, images with different grayscale levels or brightness can be displayed. For example, a larger open interval allows for the display of images with higher grayscale levels. For instance, for the same sub-pixel, on a frame-by-frame basis, the corresponding light-emitting element is made to emit light with different open intervals, thereby allowing images with different grayscale levels to be displayed frame-by-frame.

[0062] Therefore, for a specific sub-pixel, the emission of the light-emitting element included in the specific sub-pixel is determined based on digital data, and the opening range (emission range) of the corresponding light-emitting element is adjusted according to the programming signal, so that an image with the desired grayscale or brightness can be displayed.

[0063] The display panel 10 may include multiple drive blocks 20. The controller 50 may control the drive circuit 30 to drive the multiple drive blocks 20.

[0064] Each driving block 20 may include multiple sub-pixels ( Figure 5 (SP-1 to SP-N). The driving circuit 30 can drive multiple sub-pixels SP-1 to SP-N of each driving block 20.

[0065] Although not shown, multiple driving circuits 30 may be configured. Each driving circuit 30 may drive at least two or more sub-pixels, but is not limited thereto.

[0066] like Figure 3 As shown, the display panel 10 may include a plurality of pixels arranged in a matrix.

[0067] Each of the multiple driving blocks 20 may include multiple light-emitting elements 120-1 to 120-N. Each of the multiple driving blocks 20 may include multiple sub-pixels SP-1 to SP-N. The multiple sub-pixels SP-1 to SP-N may include multiple light-emitting elements 120-1 to 120-N. A sub-pixel may include at least one or more light-emitting elements.

[0068] Although the diagram shows each driving block 20 comprising, for example, 48 subpixels SP-1 to SP-48, it is not limited thereto. For example, a unit pixel can be composed of three subpixels. For instance, a unit pixel can be composed of a red subpixel, a green subpixel, and a blue subpixel. Although not shown, a unit pixel can be composed of four subpixels. For instance, a unit pixel can be composed of a red subpixel, a green subpixel, a blue subpixel, and a transparent subpixel.

[0069] Red subpixels can emit red light, green subpixels can emit green light, and blue subpixels can emit blue light. Therefore, a red subpixel can include at least one red light-emitting element that emits red light, a green subpixel can include at least one green light-emitting element that emits green light, and a blue subpixel can include at least one blue light-emitting element that emits blue light.

[0070] For example, the first light-emitting element 120-1 can be a red light-emitting element, the second light-emitting element 120-2 can be a green light-emitting element, and the third light-emitting element 120-3 can be a blue light-emitting element, but it is not limited to these. The fourth light-emitting element 120-4 to the forty-eighth light-emitting element 120-48 can also define a pixel by using three light-emitting elements as a unit.

[0071] Multiple light-emitting elements 120-1 to 120-N may include organic semiconductor light-emitting elements, inorganic semiconductor light-emitting elements, micro LEDs (hereinafter referred to as μ-LEDs), nano LEDs, etc.

[0072] On one hand, each of the multiple driver blocks 20 includes a micro IC 100. The micro IC 100 can be collectively connected to multiple light-emitting elements 120-1 to 120-N included in a single driver block, and cause the multiple light-emitting elements 120-1 to 120-N to emit light. For example, a micro IC 100 can receive multiple light-emitting information from the driver circuit 30 for causing the multiple light-emitting elements 120-1 to 120-N included in the corresponding driver block 20 to emit light. The light-emitting information can be, for example, digital data, programming signals, etc. For instance, when the micro IC 100 receives multiple light-emitting information, it can drive the multiple light-emitting elements 120-1 to 120-N to emit light based on the multiple light-emitting information.

[0073] Each light-emitting element 120-1 to 120-N can emit light in response to corresponding light-emitting information, such as digital data and programming signals. For example, the corresponding light-emitting element can be turned on / off according to the digital data, and the corresponding light-emitting element can emit light during the light-emitting time of a determined frame based on the light-emitting time information included in the programming signal.

[0074] As an example, because the multiple digital data and / or multiple programming signals provided during a frame are different from each other, the multiple light-emitting elements 120-1 to 120-N of each driving block 20 can emit light during a frame to display images of different grayscale levels. As another example, for the same light-emitting element, since the digital data and / or programming signals provided according to the frame are different from each other, the same light-emitting element can emit light to display images of different grayscale levels according to the frame.

[0075] Figure 4 A block diagram illustrating a driver block according to an embodiment.

[0076] Reference Figures 2 to 4 According to the embodiment, the driving block 20 may include a reference current generating circuit 110, a plurality of light-emitting circuits 130-1 to 130-N, etc.

[0077] The reference current generating circuit 110 can be connected to multiple light-emitting circuits 130-1 to 130-N. The reference current generating circuit 110 can generate a reference current IREF.

[0078] Multiple light-emitting circuits 130-1 to 130-N can be connected to multiple light-emitting elements 120-1 to 120-N. The multiple light-emitting circuits 130-1 to 130-N can use a reference current IEF to generate multiple light-emitting currents IEM1 to IEMN to make the multiple light-emitting elements 120-1 to 120-N emit light.

[0079] like Figure 4As shown, the first light-emitting circuit 130-1, the fourth light-emitting circuit 130-4, ..., the forty-sixth light-emitting circuit 130-46 can utilize the reference current IEF to generate the first light-emitting current IEM1, the fourth light-emitting current IEM4, ..., the forty-sixth light-emitting current IEM46. The first light-emitting element 120-1 of the first sub-pixel SP-1, the fourth light-emitting element 120-4 of the fourth sub-pixel SP-4, ..., the forty-sixth light-emitting element 120-46 of the forty-sixth sub-pixel SP-46 can emit light through the first light-emitting current IEM1, the fourth light-emitting current IEM4, ..., the forty-sixth light-emitting current IEM46. The first sub-pixel SP-1, the fourth sub-pixel SP-4, ..., the forty-sixth sub-pixel SP-46 can be red sub-pixels. The first light-emitting element 120-1, the fourth light-emitting element 120-4, ..., the forty-sixth light-emitting element 120-46 can be red light-emitting elements.

[0080] The second light-emitting circuit 130-2, the fifth light-emitting circuit 130-5, ..., the forty-seventh light-emitting circuit 130-47 can utilize the reference current IEF to generate the second light-emitting current IEM2, the fifth light-emitting current IEM5, ..., the forty-seventh light-emitting current IEM47. The second light-emitting element 120-2 of the second sub-pixel SP-2, the fifth light-emitting element 120-5 of the fifth sub-pixel SP-5, ..., the forty-seventh light-emitting element 120-47 of the forty-seventh sub-pixel SP-47 can emit light through the second light-emitting current IEM2, the fifth light-emitting current IEM5, ..., the forty-seventh light-emitting current IEM47. The second sub-pixel SP-2, the fifth sub-pixel SP-5, ..., the forty-seventh sub-pixel SP-47 can be green sub-pixels. The second light-emitting element 120-2, the fifth light-emitting element 120-5, ..., the forty-seventh light-emitting element 120-47 can be green light-emitting elements.

[0081] The third light-emitting circuit 130-3, the sixth light-emitting circuit 130-6, ..., the forty-eighth light-emitting circuit 130-48 can utilize the reference current IREF to generate the third light-emitting current IEM3, the sixth light-emitting current IEM6, ..., the forty-eighth light-emitting current IEM48. The third light-emitting element 120-3 of the third sub-pixel SP-3, the sixth light-emitting element 120-6 of the sixth sub-pixel SP-6, ..., the forty-eighth light-emitting element 120-48 of the forty-eighth sub-pixel SP-48 can emit light through the third light-emitting current IEM3, the sixth light-emitting current IEM6, ..., the forty-eighth light-emitting current IEM48. The third sub-pixel SP-3, the sixth sub-pixel SP-6, ..., the forty-eighth sub-pixel SP-48 can be blue sub-pixels. The third light-emitting element 120-3, the sixth light-emitting element 120-6, ..., the forty-eighth light-emitting element 120-48 can be blue light-emitting elements.

[0082] For example, red, green, and blue light-emitting elements can emit light with different luminance (or brightness) due to their material properties. Therefore, different luminous currents can be supplied to the red, green, and blue light-emitting elements to produce light of the same luminance. For instance, when the luminance of the green light-emitting element is low, the luminous current supplied to the green element can be greater than the luminous current supplied to the red or blue light-emitting element. Therefore, by using a larger luminous current, the luminance of the green light-emitting element is increased, thus achieving the same luminance as the red or blue light-emitting element.

[0083] like Figure 4 As shown, multiple light-emitting circuits 130-1 to 130-48 can generate multiple light-emitting currents IEM1 to IEM48 using the reference current IREF generated by the reference current generating circuit 110. In this case, the red, green, and blue light-emitting circuits can generate different light-emitting currents from each other. The red light-emitting circuits may include, for example, the first light-emitting circuit 130-1, the fourth light-emitting circuit 130-4, ..., the forty-sixth light-emitting circuit 130-46; the green light-emitting circuits may include, for example, the second light-emitting circuit 130-2, the fifth light-emitting circuit 130-5, ..., the forty-seventh light-emitting circuit 130-47; and the blue light-emitting circuits may include, for example, the third light-emitting circuit 130-3, the sixth light-emitting circuit 130-6, ..., the forty-eighth light-emitting circuit 130-48.

[0084] On the other hand, each of the light-emitting circuits 130-1 to 130-48 can use the current mirror method to generate light-emitting currents IEM1 to IEM48 corresponding to the reference current IREF generated by the reference current generating circuit 110.

[0085] The width-to-length ratio W / L of the transistors in the multiple light-emitting circuits 130-1 to 130-48 can be designed differently relative to the width-to-length ratio W / L of the transistors in the reference current generating circuit 110, thereby determining the replication ratio. This can be expressed by mathematical formula 1.

[0086] [Mathematical Expression 1] IEM = αIREF IEM can represent the light-emitting currents IEM1 to IEM48 of the light-emitting circuits 130-1 to 130-48, IREF can represent the reference current IREF of the reference current generating circuit 110, and α can represent the replication ratio.

[0087] For example, when the aspect ratio W / L of the transistors in the multiple light-emitting circuits 130-1 to 130-48 is the same as the aspect ratio W / L of the transistors in the reference current generating circuit 110, the replication ratio α is 1, and the light-emitting currents IEM1 to IEM48 generated by the multiple light-emitting circuits 130-1 to 130-48 can be the same as the reference current IREF. For example, when the aspect ratio W / L of the transistors in the multiple light-emitting circuits 130-1 to 130-48 is greater than the aspect ratio W / L of the transistors in the reference current generating circuit 110, since the replication ratio α has a value greater than 1, the light-emitting currents IEM1 to IEM48 generated by the light-emitting circuits can be greater than the reference current IREF.

[0088] Therefore, by freely designing the width-to-length ratio (W / L) of the transistors in each of the multiple light-emitting circuits 130-1 to 130-48, the required light-emitting currents IEM1 to IEM48 for the corresponding light-emitting circuits can be obtained accurately and easily.

[0089] According to one embodiment, the aspect ratio W / L of the transistors in the light-emitting circuit can be designed to be greater than the aspect ratio W / L of the transistors in the reference current generating circuit 110. Therefore, since the aspect ratio W / L of the transistors in the reference current generating circuit 110 is designed to be smaller, a relatively smaller reference current IREF can be generated, reducing the burden of generating the reference current IREF, decreasing the size of the reference current generating circuit 110, and lowering power consumption. Simultaneously, since the multiple light-emitting currents IEM1 to IEM48 of the multiple light-emitting circuits 130-1 to 130-48 have large values, contrast can be improved and high brightness can be achieved.

[0090] On the other hand, as mentioned earlier, the red, green, and blue light-emitting circuits can produce different luminous currents. These can be represented by mathematical formulas 2 through 4.

[0091] [Mathematical Expression 2] IEM_r = α1IREF [Mathematical Expression 3] IEM_g = α2IREF [Mathematical Expression 4] IEM_b = α3IREF IEM_r, IEM_g, and IEM_b can each represent the red, green, and blue light-emitting currents, respectively. α1, α2, and α3 can each represent the replication ratio of the reference current generating circuit 110 from the red, green, and blue light-emitting circuits, respectively.

[0092] Since α1, α2, and α3 are different from each other, the red light emission current, green light emission current, and blue light emission current can also be different from each other.

[0093] According to the embodiment, considering the differences in luminance characteristics of the red, green, and blue light-emitting elements, the red, green, and blue light-emitting circuits generate different red, green, and blue light-emitting currents through different replication ratios, thereby enabling the red, green, and blue light-emitting elements to emit light with the same luminance.

[0094] On the one hand, as mentioned earlier, the same luminance can be achieved at the red, green, and blue light-emitting elements by using different red, green, and blue light-emitting currents.

[0095] Nevertheless, brightness differences may occur between the multiple micro-ICs 100 on the display panel 10. For example, even if the multiple micro-ICs 100 are manufactured on the same wafer, brightness differences may occur among the multiple micro-ICs 100 depending on their location. For example, brightness differences may occur between the multiple micro-ICs 100 due to different process equipment in the same manufacturing plant of the same manufacturer, or due to process equipment between different processes. For example, even under the same process equipment, brightness differences may occur between wafers or between micro-ICs 100 from different months. For example, brightness differences may occur among the multiple micro-ICs 100 depending on the manufacturer. For example, brightness differences may occur over time when the display device is used for a long period of time.

[0096] On the other hand, in the embodiments, the luminance during a frame is as follows: Figure 12 As shown, the area can be determined by the product of the reference current IREF and the emission time of one frame (TEM in Equation 5), i.e., the area.

[0097] In an embodiment, in order to obtain the same luminance across multiple microICs 100 or multiple light-emitting elements 120-1 to 120-N, the reference current IREF and / or the emission time TEM of a frame can be adjusted.

[0098] As one example, to achieve the same luminance across multiple microICs 100 or multiple light-emitting elements 120-1 to 120-N, the emission time TEM for one frame can be fixed, and the reference current IREF adjusted. As another example, to achieve the same luminance across multiple microICs 100 or multiple light-emitting elements 120-1 to 120-N, the reference current IREF can be fixed, and the emission time TEM for one frame adjusted. As yet another example, to achieve the same luminance across multiple microICs 100 or multiple light-emitting elements 120-1 to 120-N, both the reference current IREF and the emission time TEM for one frame can be adjusted.

[0099] To adjust the reference current IREF and / or the emission time TEM for one frame, the reference current IREF and / or the emission current can be sensed from multiple microICs 100 located on the display panel 10. That is, as Figure 2 As shown, the current sensing circuit 40 can sense a reference current IREF and / or a representative luminous current from a plurality of microICs 100. The representative luminous current can refer to a luminous current selected from at least one of the plurality of luminous circuits 130-1 to 130-N included in a microIC 100. For example, the representative luminous current can be a single luminous current selected from the plurality of luminous circuits 130-1 to 130-N included in a microIC 100. For example, the representative luminous current can be the average of two or more luminous currents selected from the plurality of luminous circuits 130-1 to 130-N included in a microIC 100.

[0100] like Figure 3 As shown, multiple sensing lines 145 can be configured on the display panel 10. The multiple sensing lines 145 can be connected to multiple microICs 100 via multiple driver blocks 20. The multiple sensing lines 145 can be connected to the reference current generation circuit 110 and / or multiple light-emitting circuits 130-1 to 130-N of the multiple microICs 100.

[0101] Multiple sensing terminals 147 can be mounted on one end of the display panel 10. Multiple sensing terminals 147 can be connected to multiple sensing lines 145. The current sensing circuit 40 can be connected to the multiple sensing lines 145 via the multiple sensing terminals 147.

[0102] like Figure 3 As shown, multiple sensing lines 145 can each be configured to pass through multiple drive blocks 20 along the Y-axis direction. For example, each sensing line 145 can be selectively connected to multiple drive blocks 20.

[0103] A reference current IREF or at least one luminous current can be transmitted from the selectively connected drive block 20 to the current sensing circuit 40 via the corresponding sensing line 145.

[0104] like Figure 7 As shown, the emission time can be determined by the sum of multiple sub-emission times within a frame. That is, by selecting multiple sub-emission times, the cumulative effect of these selected sub-emission times determines the emission time TEM of a frame. Therefore, the emission time TEM of a frame can vary with the sub-emission times selected from the multiple sub-emission times. In this way, grayscale representation can be achieved due to the variation in the emission time TEM of a frame. Using the emission time information included in the programming signal, it is possible to either not select any sub-emission times or select at least one or more sub-emission times.

[0105] For example, when the programming signal including emission time information is composed of eight bits, the emission time TEM of one frame can be represented by mathematical formula 5.

[0106] [Mathematical Expression 5] TEM = T0 × (ID[0] · 2 0 + ID[1] · 2 1 + ID[2] · 2 2 + ID[3] · 2 3 + ID[4]· 2 4 + ID[5] · 2 5 + ID[6] · 2 6 + ID[7] · 2 7 ) TEM represents the emission time of one frame, and T0 represents the reference emission time. ID[0] to ID[7] represent the eight bits of the programming signal, and ID[0] can be LSB (least significant bit) and ID[7] can be MSB (most significant bit).

[0107] For example, when a specific light-emitting circuit provides a programming signal consisting of 10,000,000, substituting 10,000,000 into mathematical formula 5, a specific light-emitting element connected to the specific light-emitting circuit can emit light during a light-emitting time TEM of 128T0 in a frame. Therefore, the specific light-emitting element can emit light to display a grayscale image corresponding to the light-emitting time TEM of 128T0.

[0108] For example, when a specific light-emitting circuit provides a programming signal consisting of 00000100, substituting 00000100 into mathematical formula 5 allows a specific light-emitting element connected to the specific light-emitting circuit to emit light during a light-emitting time TEM of 4T0 within a frame. Therefore, the specific light-emitting element can emit light to display a grayscale image corresponding to a light-emitting time TEM of 4T0.

[0109] Therefore, images with different gray levels can be displayed based on programmed signals that include different emission time information.

[0110] On the one hand, such as Figure 7 As shown, in the last interval of a frame, such as the vertical blank interval, the sensing line 145 can be selectively connected to a specific driving block 20. The reference current IREF of the specific driving block 20 or at least one luminous current can be transmitted to the current sensing circuit 40 through the corresponding sensing line 145. That is, the sensing interval SEN1 can be assigned to the vertical blank interval BS.

[0111] exist Figure 7 In this context, T1 and T2 can be virtual intervals in the vertical blank interval BS other than the sensing interval SEN1.

[0112] like Figure 8 As shown, within any interval of a frame, the sensing line 145 can be selectively connected to a specific driving block 20. The reference current IREF of the specific driving block 20 or at least one luminous current can be transmitted to the current sensing circuit 40 through the corresponding sensing line 145. That is, the sensing interval SEN2 can be assigned to any interval within a frame. For example, as Figure 8 As shown, it can be set to any interval between the sub-emission time corresponding to ID[2] and the sub-emission time corresponding to ID[3] within a frame.

[0113] exist Figure 8 In this context, T1 and T2 can be any virtual interval between the sub-emission times, excluding the sensing interval SEN2.

[0114] Although not illustrated, the sensing interval can be assigned to replace at least one of the multiple sub-emission times corresponding to ID[0] to ID[7].

[0115] On the other hand, the current sensing circuit 40 can convert the reference current IREF or at least one luminous current provided at each of the multiple drive blocks 20's microIC 100 and obtain current data. The current data can be provided to the controller 50. The reference current IREF or at least one luminous current is an analog signal, but the current data can be a digital signal.

[0116] like Figure 2 As shown, the controller 50 may include a current analysis unit 51, a luminance difference compensation unit 53, etc.

[0117] The current analysis unit 51 can analyze multiple current data provided by the current sensing circuit 40 and determine whether a brightness difference has occurred.

[0118] The current analysis unit 51 can perform histogram analysis on multiple current data points. For example... Figure 9 As shown, histogram analysis reveals that multiple micro-ICs 100 can be distributed according to the magnitude of the current data.

[0119] The current analysis unit 51 can determine the minimum luminous current IEM_min and the maximum luminous current IEM_max based on the histogram distribution results. The target luminous current IEM_tar can be located within the range between the minimum luminous current IEM_min and the maximum luminous current IEM_max. The target luminous current IEM_tar can be preset or updated through an optimization process.

[0120] The luminance difference compensation unit 53 can generate multiple luminance difference compensation signals based on the target luminous current IEM_tar, the histogram distribution results of the multiple micro-ICs 100, etc. The luminance difference compensation signals are used to adjust the luminous current IEM1 to IEMN of each of the multiple micro-ICs 100. The luminance difference compensation signals may include luminance difference compensation information, luminance difference compensation values, etc.

[0121] The driving circuit 30 can generate (or adjust) multiple control signals for adjusting multiple reference currents based on multiple luminance difference compensation signals. Furthermore, the driving circuit 30 can modulate (or adjust) multiple programming signals based on the multiple luminance difference compensation signals to adjust multiple emission times (here, emission time is the emission time of one frame). The multiple programming signals and multiple control signals can be provided to multiple microICs 100.

[0122] Multiple microICs 100 can adjust multiple reference currents based on multiple control signals. Furthermore, multiple microICs 100 can adjust multiple emission times based on multiple programming signals.

[0123] According to an embodiment, by adjusting the reference current IREF and / or the emission time TEM of a frame for each of the multiple microICs 100 based on multiple reference currents IREF and / or at least one emission current sensed from multiple microICs 100, it is possible to eliminate brightness differences among the multiple microICs 100 and ensure brightness uniformity among the multiple microICs 100. By ensuring brightness uniformity, image quality can be improved.

[0124] For example, such as Figure 10 As shown, when the luminous currents IEM1 to IEMN of a specific micro IC 100 are less than the target luminous current IEM_tar, the luminance difference compensation unit 53 can generate a luminance difference compensation signal including increased control information, so that the luminous currents IEM1 to IEMN of the specific micro IC 100 are increased to the target luminous current IEM_tar.

[0125] To give another example, such as Figure 10 As shown, when the luminous current IEM1 to IEMN of a specific micro IC 100 is greater than the target luminous current IEM_tar, the luminance difference compensation unit 53 can generate a luminance difference compensation signal including reduction control information to reduce the luminous current IEM1 to IEMN of the specific micro IC 100 to the target luminous current IEM_tar.

[0126] After such adjustments, the adjusted luminous currents IEM_ad1 and IEM_ad2 can be consistent with or similar to the target luminous current IEM_tar. For example... Figure 12As shown, when the adjusted luminous currents IEM_ad1 and IEM_ad2 are similar, the luminous time TEM of an additional frame can be adjusted to make the luminance consistent among multiple micro ICs 100.

[0127] exist Figure 9 and Figure 10 Although the adjustment of the luminous current IEM1 to IEMN is shown, the reference current IREF can also be adjusted in the same way.

[0128] Meanwhile, in the embodiments, the following two compensation methods can be used to achieve this.

[0129] In the first compensation method, the controller 50 can use a preset ratio that is sensed and stored in advance when not emitting light to generate a luminance difference compensation signal based on the reference current sensed by each of the multiple microICs 100. The luminance difference compensation signal is used to compensate for the emitting current of each of the multiple microICs 100.

[0130] In the second compensation method, the controller 50 can use a preset ratio sensed and stored in advance when not emitting light to generate a luminance difference compensation signal based on the reference current sensed by each of the multiple microICs 100 and at least one emitting current. The luminance difference compensation signal is used to compensate for the emitting current of each of the multiple microICs 100.

[0131] In the third compensation method, the controller 50 can use the second compensation method to arbitrarily change the multiple light-emitting currents of each of the multiple microICs 100, and sense the light-emitting currents one by one, thereby generating a difference compensation signal.

[0132] In the first to the third compensation methods, the preset ratio can be the aforementioned replication ratio, but this case is not limited to this.

[0133] The controller 50 can adjust the reference current using the luminance difference compensation signal obtained by the first compensation method to the third compensation method. As shown in Equation 5, the controller 50 can adjust the luminance time TEM of a frame using the luminance difference compensation signal obtained by the first compensation method to the third compensation method, using at least one bit of the reference luminance time T0 of a frame of luminance time TEM and / or at least one bit of the multiple bits of digital data that is redundant at least once.

[0134] On the one hand, refer to Figure 5 and Figure 6 The micro IC 100 will be described in detail.

[0135] Figure 5 A block diagram illustrating a display device according to a second embodiment.

[0136] Reference Figure 4 and Figure 5 The driving block 20 may include a micro IC 100, multiple light-emitting elements 120-1 to 120-N, etc. The micro IC 100 may include a reference current generating circuit 110, multiple light-emitting circuits 130-1 to 130-N, etc.

[0137] As previously mentioned, the micro IC 100 may be one of the multiple driving blocks 20 on the display panel 10.

[0138] The display panel 10 may include a display area (which includes multiple pixels) and a non-display area other than the display area. In addition, in the display panel 10, the light-emitting area may be the area corresponding to each of the multiple sub-pixels SP-1 to SP-N, and the non-light-emitting area may be the area between the multiple sub-pixels SP-1 to SP-N.

[0139] For example, multiple light-emitting elements 120-1 to 120-N can be provided in multiple light-emitting areas, and the microIC 100 can be provided in non-light-emitting areas, but is not limited thereto. For example, the reference current generating circuit 110 and the multiple light-emitting circuits 130-1 to 130-N can each be implemented individually by an IC.

[0140] Multiple light-emitting elements 120-1 to 120-N can be electrically connected between a first power line 141 and multiple light-emitting circuits 130-1 to 130-N. Multiple light-emitting circuits 130-1 to 130-N can be electrically connected between a second power line 142, a third power line 143, and a sensing line 145. A first power supply voltage EVDD can be provided to the first power line 141, and a second power supply voltage EVSS can be provided to the second power line 142. The first power supply voltage EVDD, as a high potential voltage, can be higher than the second power supply voltage EVSS, which is a low potential voltage. The second power supply voltage EVSS can be, for example, ground or 0 V, but is not limited thereto. The luminous currents IEM1 to IEMN of at least one of the multiple light-emitting circuits 130-1 to 130-N of the multiple sub-pixels SP-1 to SP-N can be sensed through the sensing line 145.

[0141] Multiple light-emitting circuits 130-1 to 130-N can generate light-emitting currents IEM1 to IEMN to supply corresponding light-emitting elements 120-1 to 120-N between the first power line 141 and the second power line 142. The light-emitting currents IEM1 to IEMN can also be referred to as driving currents, brightness currents, etc.

[0142] For example, in the first sub-pixel SP-1, the first light-emitting circuit 130-1 can be electrically connected to the first light-emitting element 120-1 and supply a first light-emitting current IEM1 to the first light-emitting element 120-1 to drive at least the first light-emitting element 120-1 to emit a first color light. For example, in the second sub-pixel SP-2, the second light-emitting circuit 130-2 can be electrically connected to at least one second light-emitting element 120-2 and supply a second light-emitting current IEM2 to the second light-emitting element 120-2 to drive the second light-emitting element 120-2 to emit a second color light. In the third sub-pixel SP-3, the third light-emitting circuit 130-3 can be electrically connected to the third light-emitting element 120-3 and supply a third light-emitting current IEM3 to the third light-emitting element 120-3 to drive the third light-emitting element 120-3 to emit a third color light. For example, the first color light can be red light, the second color light can be green light, and the third color light can be blue light, but it is not limited to these.

[0143] On one hand, multiple light-emitting circuits 130-1 to 130-N can individually or simultaneously output light-emitting currents IEM1 to IEMN through sensing line 145. The output light-emitting currents IEM1 to IEMN can be sensed by the current sensing circuit 40 described later.

[0144] On the other hand, the reference current generation circuit 110 can generate a reference current IREF. The reference current generation circuit 110 can be connected to multiple sub-pixels SP-1 to SP-N.

[0145] The reference current IEF can be used to generate multiple luminous currents IEM1 to IEMN flowing in multiple sub-pixels SP-1 to SP-N. That is, the reference current IEF generated by the reference current generation circuit 110 can be replicated to multiple sub-pixels SP-1 to SP-N, so that luminous currents IEM1 to IEMN can be generated in sub-pixels SP-1 to SP-N. For example, the luminous currents IEM1 to IEMN corresponding to the reference current IEF can be generated in each sub-pixel SP-1 to SP-N using a current mirror method. For this purpose, the current mirror circuit can utilize at least one transistor of the reference current generation circuit 110 (e.g., ...). Figure 6 The reference current generating circuit 110 is composed of at least one transistor T11 of each of the multiple light-emitting circuits 130-1 to 130-N. At least one transistor T21 of the reference current generating circuit 110 may be diode connected. The gate of at least one transistor T21 of the reference current generating circuit 110 and the gate of at least one transistor T11 of each of the multiple light-emitting circuits 130-1 to 130-N may be connected together to node G.

[0146] The reference current IREF and the luminous currents IEM1 to IEMN can be constant currents. Constant current means that the current flows constantly even if the voltage applied to the terminals changes.

[0147] The luminous currents IEM1 to IEMN can be the corresponding reference current IREF. The luminous currents IEM1 to IEMN can be equal to or greater than the reference current IREF. That is to say, multiple light-emitting circuits 130-1 to 130-N can generate luminous currents IEM1 to IEMN equal to or greater than the reference current IREF according to a preset ratio, i.e., a replication ratio.

[0148] On the one hand, the reference current generating circuit 110 can be electrically connected to the second power line 142, the third power line 143 and the sensing line 145.

[0149] The second power line 142 can be connected to the reference current generating circuit 110 and multiple light-emitting circuits 130-1 to 130-N. The third power line 143 can be connected to the reference current generating circuit 110 and multiple light-emitting circuits 130-1 to 130-N. The sensing line 145 can be connected to the reference current generating circuit 110 and multiple light-emitting circuits 130-1 to 130-N.

[0150] For example, the reference current IREF generated by the reference current generation circuit 110 can be sensed through the sensing line 145.

[0151] To give another example, multiple light-emitting currents IEM1 to IEMN generated by multiple light-emitting circuits 130-1 to 130-N can be sensed individually or simultaneously through sensing line 145.

[0152] When the light-emitting circuits 130-1 to 130-N are selected to be connected between the first power line 141 and the second power line 142, the light-emitting currents IEM1 to IEMN can be generated in the light-emitting circuits 130-1 to 130-N using the reference current IREF.

[0153] Furthermore, multiple non-light-emitting currents generated in multiple light-emitting circuits 130-1 to 130-N can be sensed individually or simultaneously via sensing line 145. When light-emitting circuits 130-1 to 130-N are selected to be connected between the third power line 143 and the second power line 142, non-light-emitting currents can be generated in light-emitting circuits 130-1 to 130-N using a reference current IREF.

[0154] A third power supply voltage PVDD can be provided to the third power supply line 143. The third power supply voltage PVDD, as a high-potential voltage, can be similar to the first power supply voltage EVDD. For example, the third power supply voltage PVDD can be lower than the first power supply voltage EVDD, but is not limited thereto.

[0155] Since the second power line 142 is connected to both the reference current generating circuit 110 and the multiple light-emitting circuits 130-1 to 130-N, the transistor T21 of the reference current generating circuit 110, which constitutes the current mirror circuit, and the multiple transistors T11 of the multiple light-emitting circuits 130-1 to 130-N can share the second power supply voltage EVSS supplied to the second power line 142. Therefore, the transistor T21 of the reference current generating circuit 110 and the multiple transistors T11 of the multiple light-emitting circuits 130-1 to 130-N are simultaneously affected by the IR voltage drop associated with the second power supply voltage EVSS, and thus are not affected by the individual light-emitting currents IEM1 to IEMN of the multiple sub-pixels SP-1 to SP-N, thereby preventing image quality degradation.

[0156] In the attached diagram, node G can be a node between the gate of transistor T21 of the reference current generating circuit 110 that constitutes the current mirror circuit and the gate of transistor T11 of each of the multiple light-emitting circuits 130-1 to 130-N.

[0157] Based on the reference current IREF generated by the reference current generation circuit 110, a predetermined voltage V can be generated at node G through the transistor T21 of the reference current generation circuit 110. G Through a predetermined voltage V G Multiple light-emitting currents IEM1 to IEMN can be generated by transistors T11 of multiple light-emitting elements 120-1 to 120-N. In this case, as described above, the width-to-length ratio of transistors T11 of light-emitting elements 120-1 to 120-N can be designed to be the same as or different from the width-to-length ratio of transistor T21 of reference current generation circuit 110, thereby allowing the same or different multiple light-emitting currents IEM1 to IEMN to be generated based on the voltage V on node G. G It is generated at the transistor T11 of each of the multiple light-emitting elements 120-1 to 120-N.

[0158] On the other hand, as described above, the reference current generating circuit 110 and the plurality of light-emitting circuits 130-1 to 130-N can be connected together to the second power supply line 142, or together to the sensing line 145.

[0159] As a first example, the reference current generating circuit 110 connected to the third power line 143 and the second power line 142 can generate a reference current IREF.

[0160] As a second example, multiple light-emitting circuits 130-1 to 130-N connected to the first power line 141 and the second power line 142 can generate multiple light-emitting currents IEM1 to IEMN.

[0161] As a third example, the reference current IREF generated at the reference current generation circuit 110 can be output through the sensing line 145.

[0162] As a fourth example, multiple light-emitting currents IEM1 to IEMN generated at multiple light-emitting circuits 130-1 to 130-N can be output individually or simultaneously through sensing line 145.

[0163] As a fifth example, the non-luminescent current generated at multiple light-emitting circuits 130-1 to 130-N can be output through sensing line 145.

[0164] In one embodiment, the reference current IREF, the light-emitting currents IEM1 to IEMN and / or the non-light-emitting current output through the sensing line 145 can be sensed and used to control the reference current generating circuit 110 and / or multiple light-emitting circuits 130-1 to 130-N.

[0165] Figure 6 This is a circuit diagram of a microIC according to an embodiment. Figure 6 Show Figure 5 The circuits in the reference current generation circuit 110 and the first light-emitting circuit 130-1 of the first sub-pixel SP-1 are configured. Figure 2 and Figure 5 The current sensing circuit 40 in the middle can also be included in Figure 6 middle. Figure 6 Only show Figure 5 The circuit configuration of the first light-emitting circuit 130-1 of the first sub-pixel SP-1. The circuit configuration of the second light-emitting circuit 130-2 to the Nth light-emitting circuit 130-N can be the same as the circuit configuration of the first light-emitting circuit 130-1. Therefore, the description of the circuit configuration of the second light-emitting circuit 130-2 to the Nth light-emitting circuit 130-N can be applied to the description of the circuit configuration of the first light-emitting circuit 130-1.

[0166] Reference Figure 6 The micro IC 100 may include a reference current generating circuit 110, a first light-emitting circuit 130-1, etc.

[0167] The reference current generating circuit 110 can be connected to the first light-emitting circuit 130-1. The reference current IREF generated or adjusted by the reference current generating circuit 110 can be replicated to the first light-emitting circuit 130-1. Therefore, the first light-emitting current IEM1 can be generated in the first light-emitting circuit 130-1, and at least one or more first light-emitting elements 120-1 of the first sub-pixel SP-1 can emit light through the first light-emitting current IEM1.

[0168] In an embodiment, the reference current generating circuit 110 may include a reference current adjusting circuit 115 for adjusting the reference current IREF. When the reference current IREF is adjusted by the reference current adjusting circuit 115, the first light-emitting circuit 130-1 may generate an adjusted first light-emitting current IEM1 corresponding to the adjusted reference current IREF. For example, when the reference current IREF is adjusted to increase, the first light-emitting circuit 130-1 may generate an increased first light-emitting current IEM1 corresponding to the increased reference current IREF. For example, when the reference current IREF is adjusted to decrease, the first light-emitting circuit 130-1 may generate a decreased first light-emitting current IEM1 corresponding to the decreased reference current IREF.

[0169] The luminance of the first light-emitting element 120-1 can be determined by the product of the first luminous current IEM1 and the luminous time TEM of one frame. In this case, when the luminance of the first light-emitting element 120-1 needs to be reduced to match the target luminance, the first luminous current IEM1 and / or the luminous time TEM of one frame of the first light-emitting circuit 130-1 can be adjusted and reduced. Using the same adjustment method, the luminance of the first light-emitting element 120-1 can be matched with the target luminance. Figure 3 As shown, the luminance of the light-emitting elements 120-1 to 120-N connected to each of the multiple micro-ICs 100 can be adjusted to match the target luminance. Therefore, luminance differences between the multiple micro-ICs 100 can be eliminated, and defects such as color spots can be prevented, thereby improving image quality.

[0170] On one hand, the first emission current IEM1 can be determined by the reference current IREF. When the reference current IREF is adjusted, the first emission current IEM1 can be changed. The emission time TEM of a frame can be determined based on the reference emission time. When the reference emission time is adjusted, the emission time TEM of a frame can be changed. As described later, as shown in Equation 8, the emission time TEM of a frame can be adjusted using at least one bit that is redundantly set at least once among multiple bits of digital data. In this way, the redundant setting of bits can be called bit weight setting.

[0171] On the other hand, due to the various factors mentioned above, brightness differences may occur among the multiple microICs 100 on the display panel 10.

[0172] In an embodiment, in order to eliminate the brightness difference between multiple micro ICs 100 and ensure uniform brightness, the emission time TEM of a frame can be adjusted using a reference current IREF, or the emission time TEM of a frame can be adjusted using a reference emission time T0 in the emission time TEM of a frame and / or at least one bit with at least one redundancy.

[0173] For example, the reference current IREF can be adjusted in the reference current adjustment circuit 115 to increase or decrease, and the first light-emitting current IEM1 of the first light-emitting circuit 130-1 can be increased or decreased, thereby adjusting the brightness of the first light-emitting element 120-1.

[0174] As another example, the emission time TEM of a frame of the first light-emitting circuit 130-1 can be adjusted, thereby adjusting the luminance of the first light-emitting element 120-1. The emission time TEM of a frame can be adjusted using a reference emission time T0, or using at least one bit that is redundant at least once among a plurality of bits.

[0175] To give another example, such as Figure 12 As shown, the reference current IREF and the emission time TEM of one frame can be adjusted to adjust the luminance of the first light-emitting element 120-1. Figure 12 In this context, luminance can be determined by the area of ​​the reference current IREF and the luminescence time TEM of a frame.

[0176] The reference current adjustment circuit 115 may include a constant current source 111-1 and a selector switch 112-1. Although only one constant current source 111-1 and one selector switch 112-1 are shown in the figure, multiple constant current sources can be connected in parallel, and multiple selector switches can be connected in series to each of the multiple constant current sources. Hereafter, 111-1 can represent multiple constant current sources, and 112-1 can represent multiple selector switches.

[0177] Each of the multiple constant current sources 111-1 can be a source for generating constant current. The multiple constant current sources 111-1 can be connected in parallel between the third power line 143 and the first transistor T21.

[0178] Multiple constant current sources 111-1 and multiple selection switches 112-1 can be electrically connected. The multiple constant current sources 111-1 can be selected based on the switching of the multiple selection switches 112-1. Each of the multiple constant current sources 111-1 may include a second transistor T22-1, and each of the multiple selection switches 112-1 may include a third transistor T23-1. The second transistor T22-1 and the third transistor T23-1 may be PMOS transistors, but are not limited thereto.

[0179] For example, multiple second transistors T22-1 can be connected in parallel between the third power line 143 and the first transistor T21.

[0180] In this configuration, the gates of multiple second transistors T22-1 can be connected together. These multiple second transistors T22-1 can generate multiple constant currents based on a reference voltage VREF input to their gates. These constant currents can be the same or different. The multiple constant currents may change when the reference voltage VREF is adjusted.

[0181] At this point, the generation of multiple constant currents can be determined by whether multiple selector switches 112-1 are turned on or off.

[0182] Multiple selector switches 112-1 can be connected in series with multiple second transistors T22-1. Each of the multiple selector switches 112-1 may include a third transistor T23-1. The third transistor T23-1 may include a PMOS transistor, but is not limited thereto.

[0183] The reference current IREF can be generated using at least one constant current selected from a plurality of constant currents. For example, the more constant currents selected, the larger the reference current IREF can be. The reference current IREF can be used to generate the first luminous current IEM1 in the first luminous circuit 130-1.

[0184] Multiple third transistors T23-1 can be turned on / off according to multiple selection signals C21. Since the multiple third transistors T23-1 are PMOS transistors, when the multiple selection signals C21 are low, each of the multiple third transistors T23-1 can be turned on, and when the multiple selection signals C21 are high, each of the multiple third transistors T23-1 can be turned off.

[0185] Although the attached diagram shows four constant current sources 111-1 and four selector switches 112-1, more constant current sources and selector switches can be provided.

[0186] On one hand, the reference current generating circuit 110 may include a first transistor T21 and third control switches 113-1 and 113-2 connected to the first transistor T21.

[0187] The first transistor T21 can be diode-connected. That is, the gate and drain of the first transistor T21 can be connected together. The reference current IREF, determined by the multiple constant currents generated by the multiple constant current sources 111-1, can flow through the first transistor T21.

[0188] The first transistor T21 of the reference current generating circuit 110 can form a current mirror circuit with the first transistor T11 of the first light-emitting circuit 130-1. In this case, the gate of the first transistor T21 of the reference current generating circuit 110 and the gate of the first transistor T11 of the first light-emitting circuit 130-1 can be connected to node G together.

[0189] The third control switches 113-1 and 113-2 can be connected to the first transistor T21 and can control the opening / closing of the reference current IREF. "Opening" of the reference current IREF means that the reference current IREF flows in the first transistor T21, and "closing" of the reference current IREF means that the reference current IREF does not flow in the first transistor T21.

[0190] The third control switch may include a third-first control switch 113-1 and a third-second control switch 113-2. The third-first control switch 113-1 may be connected between the first transistor T21 and the second power line 142, and the third-second control switch 113-2 may be connected between the reference current adjustment circuit 115 and the first transistor T21.

[0191] The third-first control switch 113-1 may include a sixth transistor T24, and the third-second control switch 113-2 may include a seventh transistor T25. The sixth transistor T24 may include an NMOS transistor, and the seventh transistor T25 may include a PMOS transistor.

[0192] The third-to-first control switch 113-1 and the third-to-second control switch 113-2 can be simultaneously turned on or off by control signals D1 and D2, respectively. For example, when control signal D1 is high and control signal D2 is low, both the third-to-first control switch 113-1 and the third-to-second control switch 113-2 can be turned on. Conversely, when control signal D1 is low and control signal D2 is high, both the third-to-first control switch 113-1 and the third-to-second control switch 113-2 can be turned off.

[0193] When the third-first control switch 113-1 and the third-second control switch 113-2 are in the open-circuit state in response to control signals D1 and D2, the reference current IREF does not flow to the first transistor T21, which can be described as the reference current IREF being "off". When the third-first control switch 113-1 and the third-second control switch 113-2 are in the closed-circuit state in response to control signals D1 and D2, the reference current IREF can flow to the first transistor T21, which can be described as the reference current IREF being "on". The time interval during which the reference current IREF flows to the first transistor T21 can be defined as the on interval. The time interval during which the reference current IREF does not flow to the first transistor T21 can be defined as the off interval.

[0194] For example, the circuit can be divided into an open interval and a closed interval according to a period. The period can be, for example, one frame, but is not limited to this. During the open interval, the third-first control switch 113-1 and the third-second control switch 113-2 can be in a closed state, allowing the reference current IREF to flow to the first transistor T21. During the closed interval, the third-first control switch 113-1 and the third-second control switch 113-2 can be in an open state, preventing the reference current IREF from flowing to the first transistor T21.

[0195] On the one hand, the reference current generating circuit 110 may include a first control switch 116, a second control switch 117, and third control switches 113-1 and 113-2.

[0196] The first control switch 116 can be connected between the first transistor T21 and the second power line 142, and the second control switch 117 can be connected between the first transistor T21 and the sensing line 145.

[0197] The first control switch 116 may include a fourth transistor T26, and the second control switch 117 may include a fifth transistor T27. The fourth transistor T26 and the fifth transistor T27 may include NMOS transistors, but are not limited thereto.

[0198] For example, the first control switch 116 can be turned on, and the second control switch 117 can be turned off. In this case, the first transistor T21 can be connected to the second power supply line 142, and when the third control switches 113-1 and 113-2 are turned on, a reference current IREF can be generated based on at least one constant current generated by the reference current adjustment circuit 115.

[0199] To give another example, the first control switch 116 can be turned off, and the second control switch 117 can be turned on. In this case, the first transistor T21 can be connected to the sensing line 145, and when the third control switches 113-1 and 113-2 are turned on, the generated reference current IREF can be output through the sensing line 145.

[0200] On the other hand, the first light-emitting circuit 130-1 and the first light-emitting element 120-1 may be included in the first sub-pixel SP-1. The first light-emitting element 120-1 may be included in the first light-emitting circuit 130-1.

[0201] The first light-emitting circuit 130-1 can drive the first light-emitting element 120-1, causing the first light-emitting element 120-1 to emit light. To this end, the first light-emitting circuit 130-1 can generate a first light-emitting current IEM1, and the first light-emitting element 120-1 can emit light through the generated first light-emitting current IEM1. The first light-emitting current IEM1 can be a constant current.

[0202] The first luminous current IEM1 can be generated in response to the reference current IREF adjusted by the reference current generation circuit 110. That is, when the reference current IREF increases, the first luminous current IEM1 can also increase.

[0203] The first light-emitting circuit 130-1 may include a first transistor T11, a fifth control switch SW11, SW12-1, SW12-2, etc.

[0204] The first transistor T11 of the first light-emitting circuit 130-1 can be connected to the first light-emitting element 120-1. The first light-emitting element 120-1 and the first light-emitting circuit 130-1 can be connected in series between the first power line 141 and the second power line 142. For example, the anode of the first light-emitting element 120-1 can be electrically connected to the first power line 141, the cathode of the first light-emitting element 120-1 can be electrically connected to the drain of the first transistor T11, and the source of the first transistor T11 can be electrically connected to the second power line 142.

[0205] The first transistor T11 can generate a first luminous current IEM1. The first luminous current IEM1 can be generated based on a reference current IREF generated by the reference current generation circuit 110. The first transistor T11 can generate a first luminous current IEM1 corresponding to the reference current IREF generated by the reference current generation circuit 110. The first transistor T11 can generate a first luminous current IEM1 replicated from the reference current IREF. When the first luminous current IEM1 is generated by the first transistor T11, the first light-emitting element 120-1 can emit light through the first luminous current IEM1.

[0206] A current mirror circuit can be constructed using the first transistor T21 of the reference current generation circuit 110 and the first transistor T11 of the first light-emitting circuit 130-1. In the current mirror circuit, a first light-emitting current IEM1 can be generated at the first transistor T11 of the first light-emitting circuit 130-1 in response to the reference current IREF flowing in the first transistor T21 of the reference current generation circuit 110. At this time, the first light-emitting current IEM1 can be equal to or greater than the reference current IREF.

[0207] In this embodiment, the first transistor T21 of the reference current generating circuit 110 and the first transistor T11 of the first light-emitting circuit 130-1 can be MOS transistors, but are not limited thereto. The first transistor T21 of the reference current generating circuit 110 and the first transistor T11 of the first light-emitting circuit 130-1 can be MOS transistors of the same conductivity type. The first transistor T21 of the reference current generating circuit 110 and the first transistor T11 of the first light-emitting circuit 130-1 can be NMOS transistors, but are not limited thereto.

[0208] On one hand, the fifth control switches SW11, SW12-1, and SW12-2 of the first light-emitting circuit 130-1 can be connected to the first transistor T11 and can control the opening / closing of the first light-emitting current IEM1. The fifth control switches SW11, SW12-1, and SW12-2 may include the fifth-first control switch SW11, the fifth-second control switch SW12-1, and the fifth-third control switch SW12-2. The fifth-first control switch SW11 may include an NMOS transistor, and the fifth-second control switch SW12-1 and the fifth-third control switch SW12-2 may include PMOS transistors, but are not limited thereto.

[0209] The fifth-first control switch SW11 can be connected between the first transistor T11 and the second power line 142; the fifth-second control switch SW12-1 can be connected between the first light-emitting element 120-1 and the first transistor T11; and the fifth-third control switch SW12-2 can be connected to the third power line 143. The gates of the fifth-second control switch SW12-1 and the fifth-third control switch SW12-2 can be connected together.

[0210] The fifth-first control switch SW11 may include the sixth transistor T12-1, the fifth-second control switch SW12-1 may include the seventh transistor T13-1, and the fifth-third control switch SW12-2 may include the eighth transistor T13-2.

[0211] The sixth transistor T12-1 may include an NMOS transistor, and the seventh transistor T13-1 and the eighth transistor T13-2 may be PMOS transistors.

[0212] The fifth-first control switch SW11, the fifth-second control switch SW12-1, and the fifth-third control switch SW12-2 can be simultaneously turned on or off via control signals C11 and C12, respectively. The fifth-second control switch SW12-1 and the fifth-third control switch SW12-2 can be simultaneously turned on or off via control signal C12.

[0213] When the fifth-first control switch SW11 and the fifth-second control switch SW12-1 are in the open-circuit state via control signals C11 and C12, the first luminous current IEM1 does not flow to the first transistor T11, which can be interpreted as the first luminous current IEM1 being "off". When the fifth-first control switch SW11 and the fifth-second control switch SW12-1 are in the closed-circuit state via control signals C11 and C12, the first luminous current IEM1 flows to the first transistor T11, which can be interpreted as the first luminous current IEM1 being "on". The time period during which the first luminous current IEM1 flows to the first transistor T11 can be defined as the on interval. The time interval during which the first luminous current IEM1 does not flow to the first transistor T11 can be defined as the off interval.

[0214] For example, the circuit can be divided into an on-time interval (or light-emitting interval) and an off-time interval (non-light-emitting interval) according to a period. A period can be, for example, one frame, but is not limited to this. During the on-time interval, the fifth-first control switch SW11 and the fifth-second control switch SW12-1 can be in a closed state, allowing the first light-emitting current IEM1 to flow to the first transistor T11, and the first light-emitting element 120-1 can emit light. During the off-time interval, the fifth-first control switch SW11 and the fifth-second control switch SW12-1 can be in an open state, preventing the first light-emitting current IEM1 from flowing to the first transistor T11, and the first light-emitting element 120-1 does not emit light.

[0215] For ease of explanation, the opening interval of the first transistor T21 in the reference current IREF flowing to the reference current generating circuit 110 can be named the first opening interval, and the opening interval of the first light-emitting current IEM1 flowing to the first transistor T11 in the first light-emitting circuit 130-1 can be named the second opening interval.

[0216] When the third control switches 113-1 and 113-2 of the reference current generating circuit 110 are closed in response to control signals D1 and D2, the reference current IREF can flow to the first transistor T21 of the reference current generating circuit 110 during the first open interval. When the fifth control switches SW11, SW12-1, and SW12-2 of the first light-emitting circuit 130-1 are closed in response to control signals C11 and C12, the first light-emitting current IEM1 can flow to the first transistor T11 of the first light-emitting circuit 130-1 during the second open interval.

[0217] The second open interval may be included within the first open interval. The width of the second open interval may be greater than the width of the first open interval. The rise time of the first open interval may be faster than the rise time of the second open interval, and the fall time of the first open interval may be slower than the fall time of the second open interval.

[0218] On the other hand, the first light-emitting circuit 130-1 may include a digital memory. The digital memory can use digital data and programming signals to generate control signals C11 and C12 for switching the fifth control switches SW11, SW12-1, and SW12-2 of the first light-emitting circuit 130-1.

[0219] The fifth control switches SW11, SW12-1, and SW12-2 can be opened / closed in response to control signals C11 and C12. When the fifth control switches SW11, SW12-1, and SW12-2 are in a closed state during the second open interval in response to control signals C11 and C12, a first light-emitting current IEM1 can be generated at the first transistor T11, and the first light-emitting element 120-1 can emit light through the generated first light-emitting current IEM1.

[0220] Since the fifth control switches SW11, SW12-1, and SW12-2 remain closed during the second open interval, the first light-emitting element 120-1 can emit light during the second open interval.

[0221] The second open area can be determined by, but is not limited to, a programming signal. The programming signal may include grayscale information used to determine the second open area. Therefore, control signals C11 and C12 with the second open area can be generated based on digital data and the programming signal. For example, the larger the grayscale, the larger the second open area can be. Therefore, by changing the width of the second open area, an image with the desired grayscale can be displayed.

[0222] According to an embodiment, in response to the reference current IREF generated by the reference current generation circuit 110, a first light-emitting current IEM1, which is a constant current, can be generated at the first transistor T11 of the first light-emitting circuit 130-1. At this time, the second opening interval can be determined or adjusted based on digital data and programming signals, and the first light-emitting element 120-1 can emit light during the second opening interval, thereby enabling the display of images with different grayscale levels. For example, as the second opening interval increases, an image with higher grayscale can be displayed.

[0223] On one hand, the first light-emitting circuit 130-1 may include a first control switch 131-1, a second control switch 132-1, a third control switch 133-1, and a fourth control switch 134-1. The first control switch 131-1 to the fourth control switch 134-1 may be turned on / off in response to the first control signal CSA to the fourth control signal CSD, respectively.

[0224] The first control switch 131-1 can be connected between the first transistor T11 and the second power line 142, and the second control switch 132-1 can be connected between the first transistor T11 and the sensing line 145.

[0225] The third control switch 133-1 can be connected between the first light-emitting element 120-1 and the first transistor T11, and the fourth control switch 134-1 can be connected between the third power line 143 and the first transistor T11.

[0226] The first control switch 131-1 may include a second transistor T14, and the second control switch 132-1 may include a third transistor T15. The third control switch 133-1 may include a fourth transistor T16, and the fourth control switch 134-1 may include a fifth transistor T17.

[0227] The second transistor T14 and the third transistor T15 may include, but are not limited to, NMOS transistors. The second transistor T14 may be turned on in response to a high-level first control signal CSA. The third transistor T15 may be turned on in response to a high-level second control signal CSB.

[0228] The fourth transistor T16 and the fifth transistor T17 may include, but are not limited to, PMOS transistors. The fourth transistor T16 may be turned on in response to a low-level third control signal CSC. The fifth transistor T17 may be turned on in response to a low-level fourth control signal CSD.

[0229] On the other hand, the first control switch 131-1 of the first light-emitting circuit 130-1 and the first control switch 116 of the reference current generating circuit 110 can be simultaneously turned on or off by the first control signal CSA. When the first control switch 131-1 of the first light-emitting circuit 130-1 and the first control switch 116 of the reference current generating circuit 110 are NMOS transistors, the first control switch 131-1 of the first light-emitting circuit 130-1 and the first control switch 116 of the reference current generating circuit 110 can be simultaneously turned on in response to the high-level first control signal CSA.

[0230] The second control switch 132-1 of the first light-emitting circuit 130-1 and the second control switch 117 of the reference current generating circuit 110 can be simultaneously turned on or off via the second control signal CSB. When the second control switch 132-1 of the first light-emitting circuit 130-1 and the second control switch 117 of the reference current generating circuit 110 are NMOS transistors, they can be simultaneously turned on in response to the high-level second control signal CSB.

[0231] For example, the first control switch 131-1 can be turned on, and the second control switch 132-1 can be turned off. The first transistor T11 can be connected to the second power line 142, but electrically separated from the sensing line 145. When the third control switch 133-1 and the fifth control switches SW11, SW12-1, and SW12-2 are turned on, and the fourth control switch 134-1 is turned off, a first luminous current IEM1 can be generated at the first light-emitting circuit 130-1.

[0232] For another example, the first control switch 131-1 can be turned off, and the second control switch 132-1 can be turned on. The first transistor T11 can be connected to the sensing line 145, but electrically isolated from the second power line 142. In this case, the first luminous current IEM1 when emitting light or the non-luminous current when not emitting light can be output through the sensing line 145. The first luminous current IEM1 can be the current used to make the first light-emitting element 120-1 emit light. The non-luminous current can be the current generated in the first light-emitting circuit 130-1 between the third power line 143 and the second power line 142. The non-luminous current can be different from the first luminous current IEM1.

[0233] For example, when the third control switch 133-1 and the fifth control switches SW11, SW12-1, and SW12-2 are turned on, and the fourth control switch 134-1 is turned off, the first luminous current IEM1 generated at the first transistor T11 of the first light-emitting circuit 130-1 between the first power line 141 and the sensing line 145 can be output through the sensing line 145 to make the first light-emitting element 120-1 emit light. For example, when the third control switch 133-1 is turned off, and the fourth control switch 134-1 and the fifth control switches SW11, SW12-1, and SW12-2 are turned on, the non-luminous current generated at the first transistor T11 of the first light-emitting circuit 130-1 between the third power line 143 and the sensing line 145 can be output through the sensing line 145.

[0234] On one hand, various currents can be sensed by turning on / off the first control switch 116 and the second control switch 117 of the reference current generating circuit 110 and the first control switches 131-1 to the fourth control switches 134-1 of the first light-emitting circuit 130-1. Various currents can also be sensed by the current sensing circuit 40.

[0235] For example, the reference current IREF generated at the reference current generation circuit 110 can be sensed and used as a sensing result.

[0236] As a second example, during the emission of light from a specific light-emitting element, the reference current IREF and the specific emission currents IEM1 to IEMN can be sensed and used as sensing results.

[0237] For example, the sensing result could be the sum of the reference current IREF and specific luminous currents IEM1 to IEMN, but it is not limited to this.

[0238] As a third example, during a period when a particular light-emitting element is not emitting light, the reference current IREF and the specific non-light-emitting current can be sensed and used as sensing results.

[0239] For example, the sensing result could be the sum of a reference current IREF and a specific non-luminous current, but it is not limited to this.

[0240] These sensing results can be converted into current data by the current sensing circuit 40 and then provided to the controller 50. The controller 50 can generate multiple brightness difference compensation signals based on the current data and send them to the drive circuit 30. The drive circuit 30 can modulate (or adjust) digital data, programming signals, control signals, etc., based on the multiple brightness difference compensation signals. Here, for example... Figure 6 As shown, the control signals can be C21, D1, D2, C11, C12, etc.

[0241] The driving circuit 30 can send the adjusted digital data, programming signals, control signals, etc., to the reference current generation circuit 110 and the multiple light-emitting circuits 130-1 to 130-N of each of the multiple micro-ICs 100. Therefore, the reference current IREF can be adjusted at the reference current generation circuit 110, and the multiple light-emitting currents IEM1 to IEMN can be adjusted at the multiple light-emitting circuits 130-1 to 130-N to correspond to the adjustment of the reference current IREF. In addition, the light emission time TEM of one frame can be adjusted at each of the multiple light-emitting circuits 130-1 to 130-N according to the adjusted digital data and programming signals.

[0242] For example, the reference current IREF can be adjusted first at the reference current generation circuit 110, and then the emission time TEM of a frame can be adjusted at each of the multiple emission circuits 130-1 to 130-N.

[0243] like Figure 12 As shown, since the area of ​​the product of the reference current IREF (or the emission currents IEM1 to IEMN) and the emission time TEM of a frame is defined as luminance, the reference current IREF can be adjusted first, and then the emission time TEM of a frame can be adjusted in detail at each of the multiple emission circuits 130-1 to 130-N. Therefore, more precise luminance adjustment is possible, and luminance differences between multiple micro-ICs 100 can be eliminated, thereby ensuring uniform luminance and improving image quality.

[0244] According to the embodiment, since the first light-emitting circuit 130-1 does not have a capacitor, it is not limited by area and can increase the aperture ratio, thereby improving the brightness.

[0245] According to the embodiments, since there is no need for a display driver device that includes a converter to convert digital data into analog data, the circuit structure can be simplified, the footprint can be reduced, and the cost can be lowered.

[0246] According to the embodiment, since the reference currents IREF are adjusted in different ways, precise brightness adjustment can be performed at any time.

[0247] According to the embodiment, the brightness between display images can be easily adjusted by switching the plurality of selection switches 112-1 provided at the reference current adjustment circuit 115.

[0248] According to an embodiment, the sensing line 145 can be connected to the reference current generating circuit 110 and multiple light-emitting circuits 130-1 to 130-N, so that the reference current IREF generated at the reference current generating circuit 110, or the multiple light-emitting currents IEM1 to IEMN generated at the multiple light-emitting circuits 130-1 to 130-N, or the non-light-emitting current, can be sensed. In this manner, the sensed current can be used to control the reference current generating circuit 110 to ensure brightness uniformity between displays or between drive blocks 20 (or micro IC 100).

[0249] On the other hand, such as Figures 1 to 6 As shown, the current sensing circuit 40 can receive a reference current IREF and / or at least one light-emitting current from the respective micro-ICs 100 of the plurality of driving blocks 20 on the display panel 10. Since the sensing line 145 is electrically connected to the reference current generating circuit 110 and / or at least one light-emitting circuit, the reference current IREF and / or at least one light-emitting current can be sent to the current sensing circuit 40.

[0250] When a sensing line 145 passes through multiple driving blocks 20, the sensing line 145 can be selectively connected to a micro-IC 100 of one of the driving blocks 20. In this case, a reference current IREF and / or at least one luminous current can be sent from the selectively connected micro-IC 100 corresponding to the driving block 20 to the current sensing circuit 40. For example, since the sensing line 145 is sequentially selectively connected to each of the multiple driving blocks 20, the reference current IREF and / or at least one luminous current can be sequentially sent from multiple micro-ICs 100 of the multiple driving blocks 20 to the current sensing circuit 40.

[0251] The current sensing circuit 40 can digitally convert the reference current IREF and / or at least one luminous current to obtain current data.

[0252] The controller 50 can perform histogram analysis on multiple current data points. For example... Figure 9 As shown in the histogram analysis results, the multiple micro-ICs 100 can be distributed according to the magnitude of the current data. The distribution of the current data reveals differences in the luminous currents IEM1 to IEMN among the multiple micro-ICs 100. This indicates differences in luminance among the multiple micro-ICs 100.

[0253] The controller 50 can determine the minimum luminous current IEM_min, the maximum luminous current IEM_max, the target luminous current IEM_tar, etc., based on the distribution of current data.

[0254] The controller 50 can control the drive circuit 30 based on the multiple light-emitting currents IEM1 to IEMN sensed at multiple microICs 100, with the target light-emitting current IEM_tar as a reference, to adjust the multiple light-emitting currents IEM1 to IEMN of the multiple microICs 100.

[0255] The controller 50 can generate multiple brightness difference compensation signals based on the target luminous current IEM_tar, the distribution results of multiple micro ICs 100, etc., to adjust the luminous current IEM1 to IEMN of each of the multiple micro ICs 100.

[0256] Although Figure 9 The histogram distribution is shown with regard to at least one emitting current of each of the multiple microICs 100, but the histogram distribution can also be shown with regard to the reference current IREF of each of the multiple microICs 100. In this case, such as Figure 12 As shown, the target reference current IREF_tar can be located between the minimum reference current IREF_min and the maximum reference current IREF_max.

[0257] The controller 50 can generate a brightness difference compensation signal based on the target reference current IREF_tar, the distribution results of multiple microICs 100, etc., to adjust the reference current IREF of each of the multiple microICs 100.

[0258] For example, the luminance difference compensation signal can be a signal that controls the drive circuit 30 to add a reference current IEF (or luminous current IEM1 to IEMN) smaller than the target current IEF_tar or IEM_tar to the multiple reference currents IEF (or luminous currents IEM1 to IEMN) of the multiple micro ICs 100.

[0259] To give another example, the luminance difference compensation signal can be a signal that controls the drive circuit 30 to reduce the reference current IEF (or luminous current IEM1 to IEMN) that is greater than the target current IEF_tar or IEM_tar among the multiple reference currents IEF (or luminous currents IEM1 to IEMN) of the multiple micro ICs 100.

[0260] The target reference current IREF_tar and the target luminous current IEM_tar can be collectively referred to as the target current IREF_tar or IEM_tar. Hereinafter, target current IREF_tar or IEM_tar may refer to the target reference current IREF_tar or the target luminous current IEM_tar.

[0261] The driving circuit 30 can modulate (or adjust) digital data, programming signals, control signals, etc., based on multiple brightness difference compensation signals.

[0262] Multiple micro-reference current generation circuits 110 of multiple micro-ICs 100 can decrease or increase the reference current IREF according to the modulated (or adjusted) control signal to be the same as the target current IREF_tar or IEM_tar.

[0263] Multiple light-emitting circuits 130-1 to 130-N of multiple micro ICs 100 can reduce or increase the light-emitting time TEM of one frame according to the modulated (or adjusted) control signal, so as to be the same as the target current IREF_tar or IEM_tar.

[0264] like Figure 12 As shown, the area of ​​the product of the reference current IREF and the emission time TEM of one frame can be defined as luminance. That is, luminance (LUM) can be expressed by mathematical formula 6.

[0265] [Mathematical Expression 6] LUM = IREF_tar × TEM_tar = IREF_min × TEM_min = IREF_max × TEM_max For example, when the reference current IREF of a specific micro IC 100 is close to the minimum reference current IREF_min, the reference current IREF can be increased to be similar to the target reference current IREF_tar, thereby allowing for initial adjustment of the luminance.

[0266] Generally, a reference current IREF and a single-frame emission time TEM can be preset at multiple micro-ICs 100. For example, the reference current IREF may not be increased beyond the maximum reference current IREF_max. In this case, the reference current IREF of a specific micro-IC 100 can be adjusted to be similar to the target reference current IREF_tar within a range not exceeding the maximum reference current IREF_max. Since the adjusted reference currents IREF_ad1 and IREF_ad2 are inconsistent with the target reference current IREF_tar, brightness differences may still occur.

[0267] To address this issue, the emission time TEM of a specific micro IC 100 for one frame can be adjusted to match the target luminance (IREF_tar × TEM_tar).

[0268] like Figure 12 As shown, the emission time TEM of a frame can be adjusted at the interval T11 between the minimum emission time TEM_min and the maximum emission time TEM_max.

[0269] When the adjusted reference currents IREF_ad1 and IREF_ad2 are adjusted to be close to the target reference current IREF_tar, even if the emission time TEM of one frame is finely adjusted, it can be consistent with the target luminance (IREF_tar × TEM_tar). Therefore, when the adjusted reference currents IREF_ad1 or IREF_ad2 are adjusted to be close to the target reference current IREF_tar, the emission time TEM of one frame can be adjusted at the time interval T12 set to be close to the target emission time TEM_tar.

[0270] For example, in order to match the target luminance (IREF_tar × TEM_tar), the emission time TEM of a frame of a specific micro IC 100 can be adjusted to match the target emission time TEM_tar at the set time interval T12.

[0271] For example, as shown in Equation 7, the emission time TEM of a frame can be adjusted based on the minimum reference current IREF_min, but is not limited to this.

[0272] [Mathematical Expression 7] TEM = TEM_min × [IREF / IREF_min] TEM represents the emission time of one frame, TEM_min represents the minimum emission time, IREF represents the corresponding reference current, and IREF_min represents the minimum reference current IREF_min.

[0273] IREF / IREF_min can also be replaced by IEM / IEM_min. Here, IEM can represent the corresponding luminous currents IEM1 to IEMN, and IEM_min can represent the minimum luminous current IEM_min.

[0274] It's important to note that TEM_min does not represent the physical minimum emission time within a frame, but rather a symbolic minimum emission time used to calculate luminance based on its product with the minimum reference current IREF_min. In other words, the emission time TEM in a frame is physically defined as: maximum emission time TEM_max < target emission time TEM_tar < minimum emission time TEM_min, and the minimum emission time TEM_min can be the maximum. Conversely, the reference current IREF can be physically defined as: minimum reference current IREF_min < target reference current IREF_tar < maximum reference current IREF_max.

[0275] TEM_ad1 and TEM_ad2 can be values ​​where the emission time of a frame is adjusted to be less than or greater than the target emission time TEM_tar.

[0276] For example, after the reference current IREF is decreased or increased, the emission time TEM of a frame can be decreased or increased, but is not limited to this. After initially adjusting the brightness difference among multiple micro-ICs 100 by decreasing or increasing the reference current IREF, the emission time TEM of a frame can be decreased or increased, and the brightness difference among multiple micro-ICs 100 can be fine-tuned again. This allows for more precise brightness difference adjustment, thereby improving image quality.

[0277] On one hand, as previously described, multiple reference currents IREF of the multiple microICs 100 sensed by the current sensing circuit 40 can be provided to the controller 50. The controller 50 can use mathematical formula 1 to obtain multiple representative luminous currents from the multiple reference currents IREF of the multiple microICs 100. For the multiple microICs 100, the controller 50 can generate a luminance difference compensation signal by performing histogram analysis on the obtained multiple representative luminous currents to control the drive circuit 30. Since the generation of the luminance difference compensation signal has already been explained, it will not be repeated here.

[0278] On the other hand, the controller 50 can use the relationship information between the reference current IREF and the light-emitting currents IEM1 to IEMN for each of the multiple microICs 100 to control the drive circuit 30 to adjust the light-emitting time TEM of one frame. The relationship information between the reference current IREF and the light-emitting currents IEM1 to IEMN can be obtained by sensing the reference current IREF and the light-emitting currents IEM1 to IEMN. For example, after the multiple microICs 100 are mounted on multiple drive blocks 20, the reference current IREF and the representative light-emitting current can be sensed from each of the multiple microICs 100 through the current sensing circuit 40. The representative light-emitting current can be at least one light-emitting current sensed from at least one of the multiple light-emitting circuits 130-1 to 130-N included in the multiple microICs 100.

[0279] The controller 50 can obtain relationship information based on the ratio between the reference current IREF sensed by each of the plurality of microICs 100 and the representative emission current. The relationship information obtained in this way can be stored in memory.

[0280] The relationship information between the red, green, and blue sub-pixels can be different. Even if the same reference current IREF is generated at the reference current generation circuit 110, the red, green, and blue emitting currents generated at the red emitting element of the red sub-pixel, the green emitting element of the green sub-pixel, and the blue emitting element of the blue sub-pixel, respectively, can also be different. Therefore, the relationship information of the red, green, and blue emitting currents with respect to the reference current IREF can be different for each of them.

[0281] When the display panel 10 is driven, the controller 50 controls the drive circuit 30 based on the relationship information stored in the memory, to adjust the red emission time, green emission time, and blue emission time of each of the multiple micro-ICs 100 in a frame differently. Therefore, not only can the brightness difference between the multiple micro-ICs 100 be eliminated, but also the brightness difference between red sub-pixels, green sub-pixels, and blue sub-pixels can be eliminated, and the image quality is improved by ensuring the uniformity of brightness.

[0282] Figure 11 The programming signal of one frame in the third embodiment is shown.

[0283] like Figure 2 As shown, the controller 50 can control the drive circuit 30 to adjust the emission time TEM of a frame by using at least one bit of digital data that is redundant at least once.

[0284] For example, such as Figure 11 As shown, since a frame corresponds to ID A [5] has one more bit redundancy, therefore the redundancy can be used to determine the ID. A The bit value of [5] is used to adjust the emission time TEM of a frame. This can be expressed by Equation 8. In this case, the driving frequency can be increased compared to the driving frequency when the emission time TEM of a frame is calculated according to Equation 5.

[0285] [Mathematical Expression 8] TEM = T0 × (ID[0] · 2 0 + ID[1] · 2 1 + ID[2] · 2 2 + ID[3] · 2 3 + ID[4]· 2 4 + ID[5] · 2 5 + ID A [5] · 2 5 + ID[6] · 2 6 + ID[7] · 2 7 ) TEM can represent the emission time of a frame, which can be obtained through the aforementioned redundant ID. A [5] The bit value is adjusted.

[0286] Therefore, the emission time TEM of a frame can be reduced or increased based on the bit value of at least one bit that is redundant at least once in the emission time TEM of a frame.

[0287] In summary, the emission time TEM of a frame can be adjusted by using a reference emission time T0, or by using at least one bit with at least one redundancy.

[0288] Therefore, after adjusting the reference current IREF to initially adjust the luminance difference, the emission time TEM of one frame is adjusted to readjust the luminance difference. This allows for more precise and accurate adjustment of the luminance difference between multiple micro-ICs 100, ensuring uniform luminance among the multiple micro-ICs 100.

[0289] The detailed description above should not be construed as restrictive in any respect, but rather as exemplary. The scope of the embodiments should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the embodiments are included within the scope of the embodiments.

Claims

1. A display device, wherein, include: Multiple drive blocks on the display panel; A driving circuit that drives the plurality of driving blocks; as well as A controller that controls the drive circuit to drive the plurality of drive blocks. Each of the plurality of driver blocks includes: Includes multiple light-emitting elements in multiple sub-pixels; and A micro IC that is connected to the plurality of light-emitting elements to make the plurality of light-emitting elements emit light. The micro IC includes: A reference current generating circuit that generates a reference current; and Multiple light-emitting circuits connected to the multiple light-emitting elements, Each of the plurality of light-emitting circuits generates a light-emitting current based on the reference current, so that each of the plurality of light-emitting elements emits light. The controller controls the drive circuit to adjust the sensed reference current based on the target current when each of the plurality of microICs senses a reference current.

2. The display device according to claim 1, wherein, The controller controls the drive circuit to adjust the reference current based on the target current when each of the plurality of microICs senses a representative light-emitting current.

3. The display device according to claim 2, wherein, The controller controls the drive circuit to increase the reference currents among the plurality of reference currents of the plurality of microICs that are less than the target current.

4. The display device according to claim 2, wherein, The controller controls the drive circuit to reduce the reference currents among the plurality of reference currents of the plurality of microICs that are greater than the target current.

5. The display device according to claim 2, wherein, The controller controls the drive circuit to adjust the light emission time of each of the multiple microICs for one frame, while the multiple reference currents of the multiple microICs have been adjusted.

6. The display device according to claim 5, wherein, The emission time of a frame is adjusted based on the minimum reference current or the minimum emission current.

7. The display device according to claim 5, wherein, The controller controls the drive circuit so that the product of the reference current and the emission time of the frame is the same in each of the micro-ICs.

8. The display device according to claim 2, wherein, The sensed plurality of reference currents or the sensed plurality of representative luminescent currents are obtained between or within frames.

9. The display device according to claim 1, wherein, The controller controls the drive circuit to adjust the emission time of a frame by using the relationship information between the reference current and the emission current of each of the plurality of microICs.

10. The display device according to claim 1, wherein, The controller controls the drive circuit to adjust the emission time of a frame by using at least one bit of digital data that is redundant at least once.

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