A display driving circuit and a display device

Abstract

This application provides a display driving circuit and a display device, including an X-row, Y-column pixel unit, each pixel unit corresponding to at least one pixel. The display driving circuit includes a current generating unit and a screen judgment unit. The current generating unit includes multiple current generating sub-units, which are connected one-to-one with the X-row, Y-column pixel unit. Any one of the multiple current generating sub-units outputs a reference current of a set proportion as a bias current, which is provided to the corresponding pixel unit. The screen judgment unit is used to determine that there is a non-light-emitting area in the pixel unit array, and then turns off at least one of the multiple current generating sub-units. By turning off unnecessary current generating sub-units, the static power consumption of the display screen in non-full-screen or black screen states can be significantly reduced, thereby extending battery life and improving user experience.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display driving circuit and a display device. Background Technology

[0002] In various display devices such as mobile devices and portable electronic products, power management of the display screen is one of the key factors in extending battery life and improving user experience. When these devices need to remain off for extended periods, screen power consumption becomes a major concern, especially for micro light-emitting diode (Micro LED) displays. Because each pixel in a Micro LED is self-illuminating, unlike liquid crystal displays (LCDs) that rely on backlighting, its power consumption is directly related to the number of active pixels, brightness, and drive current.

[0003] Therefore, it is necessary to optimize the power management of Micro LED displays, especially to reduce static power consumption when the screen is off, thereby extending battery life and improving user experience. Summary of the Invention

[0004] This application provides a display driving circuit and a display device. By turning off unnecessary current generating sub-units, the static power consumption of the display screen in non-full-screen or black screen states can be significantly reduced, thereby extending battery life and improving user experience.

[0005] In a first aspect, this application provides a display driving circuit for driving a pixel unit array, the pixel unit array including X rows and Y columns of pixel units, each pixel unit corresponding to at least one pixel point, where X and Y are natural numbers. The display driving circuit includes: a current generating unit and a screen judgment unit. The current generating unit includes multiple current generating sub-units, which are connected one-to-one with the pixel units in the X rows and Y columns. Any one of the multiple current generating sub-units outputs a reference current of a set ratio as a bias current and provides it to the corresponding pixel unit. The screen judgment unit is used to turn off at least one of the multiple current generating sub-units when it determines that there is a non-light-emitting area in the pixel unit array.

[0006] By shutting down unnecessary current-generating subunits, this application significantly reduces the static power consumption of the display in non-full-screen or black-screen states. Even in non-static scenarios, the image judgment unit can dynamically adjust the current supply according to the luminous area, further optimizing energy utilization efficiency. Once new image data needs to be displayed or a previously off area begins to emit light, the image judgment unit can reactivate the corresponding current-generating subunit, ensuring a rapid response and restoration of normal display. Due to the short startup time of the current-generating subunits, even if they are shut down to save power, they can quickly resume operation when the pixel units need to be relit. Compared with traditional designs, this application achieves energy-saving management of the current-generating subunits by introducing an image judgment unit, significantly reducing static power consumption, avoiding unnecessary power waste, reducing overall power consumption, and extending the device's usage time after a single charge, thereby effectively reducing the overall power consumption of the device.

[0007] As one possible implementation, the image judgment unit includes a brightness determination module, which is used to determine the brightness of each pixel. When the brightness of all pixels corresponding to the target pixel unit is lower than the set brightness, the current generation subunit corresponding to the target pixel unit is turned off.

[0008] If the brightness of all pixels within a target pixel unit is below a set brightness threshold, the pixel unit is considered not to need to emit light. In this case, the brightness determination module generates a corresponding control signal, instructing the current generation subunit to shut off the current supply to the corresponding pixel unit. When the brightness determination module confirms that the brightness of all pixels in a target pixel unit is below the set brightness, it can issue a shutdown command to the corresponding current generation subunit, cutting off the bias current supply to that pixel unit. This not only saves power but also reduces unnecessary heat generation.

[0009] As one possible implementation, the image judgment unit includes a position determination module, which is used to determine the coordinate information of pixels whose brightness is lower than a set brightness, determine the target pixel unit based on the coordinate information of the unlit pixels, and turn off the current generation subunit corresponding to the target pixel unit.

[0010] Each pixel has unique coordinates, and each pixel unit is defined by a specific set of coordinate ranges. The coordinates of each pixel are mapped to its corresponding pixel unit. Based on this direct mapping, the boundary coordinates of each pixel unit are determined. For each unlit pixel, its coordinates are checked to see if they fall within the boundary of a certain pixel unit. The pixel units contained within these regions are then examined. If a pixel unit is completely covered by this region, the current-generating subunit corresponding to that pixel unit is turned off.

[0011] As one possible implementation, the display driving circuit further includes: a power management module for supplying power to the pixel units; and a screen judgment unit for determining that when the brightness of all pixels in the pixel unit array is lower than a set brightness, multiple current generating sub-units are turned off, and the power supply voltage to the power management module is reduced.

[0012] By shutting down all current-generating sub-units and reducing the supply voltage, greater energy efficiency can be achieved when the screen is almost completely black, minimizing power consumption. This also allows the display driver circuit to not only provide a stable current but also flexibly adjust its operating mode according to actual usage conditions to achieve the best energy efficiency ratio.

[0013] As one possible implementation, each current generation subunit is a current mirror unit. By using a current mirror structure, each pixel unit can obtain the same bias current, ensuring high consistency in image quality. The stable reference current provided by the reference current generation module allows the entire system to maintain consistent performance under different conditions, improving system reliability and durability. Furthermore, when high brightness display is not required, power consumption can be reduced by lowering the reference current, thereby further optimizing energy efficiency.

[0014] As one possible implementation, the display driving circuit further includes: a reference current generation module, wherein the current mirror unit includes an NMOS input reference current mirror and a PMOS current mirror, the current input terminal of the NMOS input reference current mirror is used to connect to the reference current generation module, the current output terminal of the NMOS input reference current mirror is used to connect to the current input terminal of the PMOS current mirror, and the PMOS current mirror is used to output current to the corresponding pixel unit and other current generation sub-units.

[0015] The reference current from the reference current generation module is fed into the NMOS input reference current mirror in each current generation sub-unit. The NMOS input reference current mirror is responsible for replicating the reference current to its output. The replicated current is then passed to the PMOS current mirror through the output of the NMOS input reference current mirror. The PMOS current mirror receives the replicated current and amplifies it appropriately or passes it directly to the corresponding pixel unit as needed. Furthermore, the PMOS current mirror can also output current to other current generation sub-units to ensure current consistency throughout the circuit.

[0016] As one possible implementation, the reference current generation module includes a built-in adjustable resistor circuit, which changes the magnitude of the reference current by adjusting the resistance value of the adjustable resistor.

[0017] By using a built-in adjustable resistor circuit, each pixel unit can obtain nearly the same bias current, ensuring a high degree of consistency in image quality. The stable reference current provided by the built-in adjustable resistor circuit allows the entire circuit to maintain consistent performance under different conditions, improving the system's reliability and durability.

[0018] As one possible implementation, the image judgment unit is also used to determine that when the brightness of all pixels in the pixel unit array is lower than the set brightness, multiple current generation subunits and the reference current generation module are turned off.

[0019] If the brightness of all pixels is found to be lower than the set brightness, the entire screen is considered to be in a completely black state. A command is sent to the current generation unit to shut down all current generation sub-units, stopping the current supply to any pixel unit. At the same time, a command is sent to the reference current generation module to instruct it to stop working. This step can further reduce static power consumption. By shutting down all current generation sub-units and the reference current generation module, a deep power-saving mode can be achieved when the screen is almost completely black, minimizing power consumption.

[0020] In one possible implementation, each pixel unit includes multiple pixel circuits. The input terminal of each pixel circuit is connected to the output terminal of the corresponding current generating subunit. The output terminal of the pixel circuit is connected to the anode of the light-emitting diode (LED), the cathode of the LED is grounded, and the output terminal of the pixel circuit is also connected to the input terminal of a discharge switch. The output terminal of the discharge switch is grounded, and each LED corresponds to one pixel.

[0021] The output of each pixel circuit is also connected to the input of a discharge switch, whose output is grounded. The discharge switch provides a current release path for the pixel circuit. When a pixel needs to be turned off, in addition to stopping the current supply from the current generation subunit, the discharge switch is activated to release any residual charge in the pixel circuit to ground. This method ensures that the LEDs extinguish quickly, preventing residual brightness from affecting the display effect.

[0022] Through the above design, multiple pixel circuits in each pixel unit, together with the corresponding current generating subunit and light-emitting diode, achieve stable current control, while providing fast on and off functions. The presence of the discharge switch enhances the response speed and energy-saving performance of the display screen.

[0023] Secondly, this application provides a display device, including a pixel unit array, comprising pixel units arranged in X rows and Y columns, where X and Y are natural numbers, and a display driving circuit as described in the above embodiments. The display driving circuit provided in this application includes multiple current generating sub-units, each connected to a pixel unit in the X rows and Y columns. Any one of the multiple current generating sub-units outputs a reference current of a predetermined proportion as a bias current, which is provided to the corresponding pixel unit. A screen judgment unit is used to determine that when a non-light-emitting area exists in the pixel unit array, at least one of the multiple current generating sub-units is turned off. By turning off unnecessary current generating sub-units, the static power consumption of the display screen in non-full-screen or black screen states can be significantly reduced, thereby extending battery life and improving user experience. Attached Figure Description

[0024] Figure 1A A schematic diagram of a display driver circuit is shown below.

[0025] Figure 1B This is a schematic diagram of a display;

[0026] Figure 2 This is a schematic diagram of a pixel circuit structure;

[0027] Figure 3 A schematic diagram of the structure of a display driving circuit. Figure 3 ;

[0028] Figure 4 A schematic diagram of the structure of a display driving circuit. Figure 4 ;

[0029] Figure 5 A schematic diagram of the structure of a display driving circuit. Figure 5 ;

[0030] Figure 6 A schematic diagram of the structure of a display driving circuit. Figure 5 . Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The specific operational methods in the method embodiments can also be applied to the device embodiments or system embodiments. It should be noted that in the description of this application, "multiple" can be understood as "at least two". Furthermore, it should be understood that in the description of this application, terms such as "first" and "second" are used only for distinguishing purposes and should not be construed as indicating or implying relative importance, nor as indicating or implying order.

[0032] It should be noted that in the embodiments of this application, "connection" refers to electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components, such as the connection between A and B. Alternatively, it can be a direct connection between A and C, with C directly connected to B, and A and B connected through C. Furthermore, in this application, unless otherwise explicitly specified and limited, the terms "connected," "linked," "set up," etc., should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0033] It should be noted that the same reference numerals in the accompanying drawings of this application denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms expressing position and direction described in this application are illustrative based on the accompanying drawings, but may be modified as needed, and all modifications are included within the scope of protection of this application. The accompanying drawings of this application are for illustrating relative positional relationships only and do not represent actual scale.

[0034] MicroLEDs are current-driven light-emitting devices, and their luminous intensity is proportional to the injected current. To ensure uniform brightness and color performance in MicroLED displays, a driving circuit capable of providing a stable current is required. Current mirror circuits, or other circuits with similar functions, can replicate a reference current and keep the output current unaffected by load variations, making them ideal for driving MicroLEDs.

[0035] Since MicroLED displays may contain millions of individually controlled pixels, each pixel requires independent current driving. Current mirror circuit designs can be optimized to achieve low quiescent current and high-efficiency conversion, thereby reducing overall power consumption.

[0036] In practical applications, changes in the environment can cause variations in the threshold voltage of MicroLEDs, thus affecting their luminous efficiency. Using a current mirror circuit can ensure a relatively stable current output even under different environmental conditions.

[0037] For MicroLED, by using a constant current source provided by a current mirror circuit, MicroLED displays can achieve more consistent color reproduction and higher contrast.

[0038] However, the above design also has some drawbacks, especially in terms of power management:

[0039] Ideally, when displaying completely black content on a MicroLED screen, all pixels should remain off, minimizing power consumption. However, because the current mirror branch within each pixel unit remains on in preparation for a potential power-on command, this means that the current mirror circuit still consumes power even when no pixels are needed. While this additional power consumption may seem small individually, it becomes significant when considering the large number of such pixel units within the entire screen.

[0040] Especially in mobile devices or portable electronic products, the aforementioned static power consumption issues can significantly impact battery life. Even in standby mode or when displaying a static image, excessive unnecessarily active current-carrying branches will accelerate power consumption.

[0041] In view of this, this application provides a display driving circuit and a display device to solve the problem that the current mirror circuit in the existing MicroLED display continues to consume power in the non-light-emitting state, thereby reducing static power consumption when the screen is black, and thus extending battery life and improving user experience.

[0042] See Figure 1A As shown, Figure 1A This is a schematic diagram of a display driving circuit. The display driving circuit 100 drives a pixel unit array 200, which includes X rows and Y columns of pixel units 201. Each pixel unit 201 corresponds to at least one pixel, where X and Y are natural numbers. The display driving circuit 100 includes a current generating unit 101 and a screen judgment unit 102. The current generating unit 101 includes multiple current generating sub-units 103, each connected to a pixel unit 201 in a one-to-one correspondence. Any one of the multiple current generating sub-units 103 outputs a reference current of a set proportion as a bias current, which is provided to the corresponding pixel unit 201. The screen judgment unit 102 is used to turn off at least one of the multiple current generating sub-units 103 when it determines that there is a non-light-emitting area in the pixel unit array 200.

[0043] The pixel unit array 200 consists of pixel units 201 arranged in X rows and Y columns, with each pixel unit 201 containing at least one pixel (i.e., the smallest light-emitting unit). Here, X and Y are natural numbers representing the number of rows and columns of the pixel unit array 200. This arrangement allows the screen to be subdivided into multiple independently controllable small areas, where pixels within each area can be individually lit or turned off, thereby achieving high-resolution and high-contrast image display.

[0044] The current generating unit 101 includes multiple current generating sub-units 103, which are connected one-to-one with the pixel units 201 in the X row and Y column. For each pixel unit 201, there is a corresponding current generating sub-unit 103 that provides bias current.

[0045] The current generating subunit 103 can be directly connected to the corresponding pixel unit 201 through a specific wiring design, thereby ensuring the shortest current transmission path and reducing transmission loss and signal delay. For example, a grid-like wiring method can be used to form a uniformly distributed current supply network across the entire display panel. Each current generating subunit 103 is connected to the corresponding pixel unit 201 through an independent grid branch, ensuring that each pixel unit 201 receives a consistent and stable bias current. In addition, redundant paths can be appropriately introduced so that even if one wiring fails, power can still be supplied normally through other paths, thereby improving the reliability of the display.

[0046] Each current generating subunit 103 can output a reference current of a set ratio as a bias current to supply the corresponding pixel unit 201, ensuring that each pixel unit 201 can receive a consistent and stable drive current even under different operating conditions (such as temperature changes or voltage fluctuations).

[0047] The current generation subunit 103 replicates a reference current and outputs it according to a set ratio. Specifically, the current generation subunit 103 replicates the reference current at the input terminal to the output terminal and adjusts the magnitude of the output current as needed.

[0048] Furthermore, the current generating subunit 103 can dynamically adjust the set ratio according to different operating conditions or energy-saving modes. For example, it can reduce the current in low-brightness mode to save power, while increasing the current in high-brightness mode to improve the display effect.

[0049] The screen judgment unit 102 analyzes the currently displayed screen content in real time. Optionally, it can determine which areas are luminous and which are non-luminous by reading data from the frame buffer. The frame buffer is a memory area used to store the image data of the frame to be displayed. This data includes the color information and brightness of each pixel and is the basis for the graphics processing unit (GPU) or display controller to generate images. The GPU usually has a certain amount of built-in cache or on-chip memory used as the frame buffer. The application sends the content to be displayed to the GPU for rendering. The GPU generates image data according to the rendering instructions and writes it to the frame buffer. The data in the frame buffer is updated periodically according to the screen refresh rate to ensure the smoothness of the displayed content. The screen judgment unit 102 in the display driver circuit 100 can read image data from the frame buffer, analyze the brightness value of each pixel, and determine which areas are luminous and which are non-luminous.

[0050] See Figure 1B As shown, Figure 1B As a display illustration, based on the above-mentioned addition of a current generating subunit 103 corresponding to each pixel unit 201, this application further introduces a mechanism for identifying non-full-screen illuminated areas. When only a portion of the screen needs to be illuminated (e.g., Figure 1B The illumination range is A×B pixel units 201. By turning off the current generating sub-unit 103 (i.e. X×YA×B pixel units 201) corresponding to the area that does not need to be illuminated, the local static power consumption can be reduced.

[0051] For each pixel, its brightness value is calculated. If it is a color image, the RGB color value can be converted into a brightness value. If it is a grayscale image, the grayscale value is used directly to set a brightness threshold to distinguish between lit and unlit pixels. Based on the brightness statistics, a corresponding digital control signal is generated to indicate whether the current generating subunit 103 is turned off.

[0052] After identifying which pixel units 201 are in a non-light-emitting state, the image judgment unit 102 transmits this information to the current generation unit 101 for corresponding processing.

[0053] Specifically, when a non-light-emitting area is detected in the pixel unit array 200, the image determination unit 102 issues an instruction to selectively turn off the current generating sub-units 103 corresponding to the non-light-emitting area. For example, if no pixels in a certain pixel unit 201 need to be lit, all current generating sub-units 103 in that pixel unit 201 can be turned off.

[0054] The screen judgment unit 102 identifies the existence of non-light-emitting areas, and it will turn off the current generating sub-units 103 corresponding to the non-light-emitting areas, thereby stopping the supply of bias current to these areas and reducing power consumption.

[0055] By turning off unnecessary current-generating sub-units 103, the static power consumption of the display in non-full-screen or black-screen states can be significantly reduced.

[0056] Furthermore, even in non-static scenarios, the image judgment unit 102 can dynamically adjust the current supply according to the image content, further optimizing energy utilization efficiency. For example, in changing images, the image judgment unit 102 can respond in real time and save power.

[0057] Once new image data is detected that needs to be displayed, or an area that was originally closed starts to emit light, the image judgment unit 102 will immediately reactivate the corresponding current generation subunit 103 to ensure that the current generation subunit 103 can respond quickly and restore normal display.

[0058] Because the current generating subunit 103 has a relatively short startup time, even if the current generating subunit 103 is turned off to save power, the pixel unit 201 can quickly resume its working state when the pixel unit 201 needs to be lit up again.

[0059] In traditional designs, the current generating subunit 103 continues to consume power even when no pixels are needed to emit light. This application introduces a screen judgment unit 102 to manage the current generating subunit 103, thereby significantly reducing static power consumption. The current generating subunit 103 is only activated when pixels are actually needed to be lit, avoiding unnecessary power waste, reducing overall power consumption, extending the device's usage time after a single charge, and contributing to lower device power consumption.

[0060] It should be noted that this application is not only applicable to MicroLED displays, but can also be extended to other types of self-emissive displays (such as OLEDs) and other electronic devices with display functions that require reduced power consumption.

[0061] In summary, the technical solution provided in this application, by combining the current generation unit 101 and the image judgment unit 102, provides a more efficient energy management solution, thereby effectively solving the static power consumption problem existing in traditional designs.

[0062] Figure 2This is a schematic diagram of a pixel circuit structure. As one possible implementation, each pixel unit 201 includes M rows and N columns of pixel circuits 210. The input terminal of each pixel circuit is connected to the output terminal of the corresponding current generating subunit 103. The output terminal of the pixel circuit is connected to the anode of the light-emitting diode 211, the cathode of the light-emitting diode is grounded, and the output terminal of the pixel circuit is also connected to the input terminal of the discharge switch. The output terminal of the discharge switch is grounded. Each light-emitting diode corresponds to one pixel.

[0063] Each pixel unit 201 contains multiple pixel circuits, and each pixel circuit corresponds to a light-emitting diode (LED), i.e., a pixel. The input terminal of each pixel circuit is connected to the output terminal of the corresponding current generating subunit 103. Each pixel circuit receives a stable bias current provided by the current generating subunit 103. The output terminal of the pixel circuit is directly connected to the anode of the LED, while the cathode of the LED is grounded. This connection method ensures that the LED will light up when current flows through it.

[0064] Each light-emitting diode corresponds to one pixel, so each pixel in the entire pixel unit array 200 consists of an independent pixel circuit and an LED.

[0065] The bias current generated by the current generating subunit 103 is transmitted to the input of the corresponding pixel circuit through its output terminal. This current is regulated to ensure that all pixels can receive a consistent and stable drive current.

[0066] The pixel circuitry is responsible for further transmitting the current received from the current generation subunit 103 to the light-emitting diode (LED). Specifically, it may include additional components (such as transistors) to amplify or regulate the current to suit the specific needs of the LED. When sufficient current flows through the LED, it emits light, thus displaying the image.

[0067] The output of each pixel circuit is also connected to the input of a discharge switch, whose output is grounded. The discharge switch provides a current release path for the pixel circuit. When a pixel needs to be turned off, in addition to stopping the current supply from the current generation subunit 103, the discharge switch is activated to release the residual charge in the pixel circuit to the ground. This method ensures that the LED turns off quickly, avoiding residual brightness from affecting the display effect.

[0068] Through the above design, multiple pixel circuits in each pixel unit 201 cooperate with the corresponding current generating subunit 103 and light-emitting diode to achieve stable current control, while providing fast on and off functions. The presence of the discharge switch enhances the response speed and energy-saving performance of the display screen.

[0069] The discharge switch can remain closed when not in use, activating only when a pixel needs to be quickly turned off. This helps reduce unnecessary power consumption and further optimizes the system's energy efficiency. By using current regulation in the current generation subunit 103, each pixel receives the same bias current, ensuring high consistency in image quality. The discharge switch mechanism allows the LED to be quickly turned off when needed, improving the system's response speed and stability. Combined with the function of the image judgment unit 102, power consumption can be reduced by lowering the reference current or activating the discharge switch when high brightness display is not required, further optimizing energy utilization efficiency.

[0070] See Figure 3 As shown, Figure 3 A schematic diagram of the structure of a display driving circuit 100 Figure 3 In one possible implementation, the image determination unit 102 includes a brightness determination module 301, which is used to determine the brightness of each pixel. When the brightness of all pixels corresponding to the target pixel unit 201 is lower than the set brightness, the current generation subunit 103 corresponding to the target pixel unit 201 is turned off.

[0071] The brightness determination module 301 is responsible for real-time monitoring and determining the brightness value of each pixel. The brightness determination module 301 can read the brightness information (such as the brightness component or grayscale value in the RGB color space) in the image frame data, and compare the actual brightness value of each pixel with the preset brightness threshold. If the brightness of a pixel is lower than the threshold, it is considered that the pixel is in a non-light-emitting state. The brightness determination module 301 receives the image frame data to be displayed from the GPU or display buffer.

[0072] The calculated brightness value is compared with a preset brightness threshold, which can be adjusted according to actual application needs. For example, a lower threshold can be set in low-light environments to improve detection sensitivity.

[0073] If the brightness of all pixels in a target pixel unit 201 is lower than the set brightness threshold, it is considered that the pixel unit 201 as a whole does not need to emit light. At this time, the brightness determination module 301 will generate a corresponding control signal to instruct the current generation subunit 103 to turn off the current supply to the corresponding pixel unit 201.

[0074] When the brightness determination module 301 confirms that the brightness of all pixels in a target pixel unit 201 is lower than the set brightness, the brightness determination module 301 can send a shutdown command to the corresponding current generation subunit 103 to cut off the current supply to that pixel unit 201. This not only saves power but also reduces unnecessary heat generation.

[0075] Furthermore, the brightness determination module 301 can also record the state of the current generation subunit 103 that has been turned off, so that power can be quickly restored if the area needs to be lit in subsequent scenes.

[0076] See Figure 4 As shown, Figure 4 A schematic diagram of the structure of a display driving circuit 100 Figure 4 As one possible implementation, the screen judgment unit 102 includes a position determination module 401. The position determination module 401 is used to determine the coordinate information of pixels whose brightness is lower than a set brightness, determine the target pixel unit 201 based on the coordinate information of the unlit pixels, and turn off the current generating subunit 103 corresponding to the target pixel unit 201.

[0077] The location determination module 401 is first responsible for monitoring the brightness value of each pixel in real time and comparing these brightness values ​​with a preset brightness threshold. If the brightness of a pixel is lower than this threshold, the pixel is considered to be in an unlit state.

[0078] For all pixels whose brightness is lower than the set brightness, the position determination module 401 records their coordinate information (i.e., their specific positions in the pixel unit array 200) and receives the image frame data to be displayed from the graphics processor or display buffer.

[0079] The calculated brightness value is compared with the preset brightness threshold. For those pixels whose brightness is lower than the set brightness, the position determination module 401 records their coordinate information to form a list of unlit pixels.

[0080] The position determination module 401 uses the recorded coordinate information to map these unlit pixels back to their respective pixel units 201. Each pixel unit 201 contains multiple pixels, thus determining which pixel units 201 contain all pixels in an unlit state.

[0081] Because each pixel has unique coordinates, and each pixel unit 201 is defined by a specific set of coordinate ranges, the coordinates of the pixel are mapped to the corresponding pixel unit 201. Based on the direct mapping of coordinates, the boundary coordinates of each pixel unit 201 are determined (e.g., the coordinates of the top left and bottom right corners). For each unlit pixel, it is checked whether its coordinates fall within the boundary of a certain pixel unit 201.

[0082] If all pixels in a pixel unit 201 are confirmed to be unlit, the current generating subunit 103 corresponding to that pixel unit 201 is turned off. Assuming that the image data exists in the form of blocks or continuous regions, other unlit areas can be identified by region filling.

[0083] Starting from any unlit pixel, use breadth-first search or depth-first search to traverse adjacent unlit pixels until a lit pixel is encountered, and classify these connected unlit pixels into the same region.

[0084] Check the pixel units 201 contained in these areas. If a pixel unit 201 is completely covered by this area, then turn off the current generating subunit 103 corresponding to that pixel unit 201.

[0085] For example, a sliding window method can also be used, which uses a fixed-size sliding window to scan the entire display area, moving the window a small step each time to check the brightness of the pixels within the window.

[0086] Define the size of a sliding window, starting from the top left corner and gradually moving the sliding window to the bottom right. Check the brightness of the pixels in each window. If the brightness of all pixels in a window is lower than the set threshold, then turn off the current generating subunit 103 corresponding to the pixel unit 201 covered by the window.

[0087] Based on the above mapping results, the position determination module 401 further analyzes which pixel units 201 have all pixels that are not lit, and these pixel units 201 are the target pixel units 201.

[0088] Once the target pixel unit 201 is determined, the position determination module 401 will generate a corresponding control signal to instruct the current generating subunit 103 to turn off the current supply to the corresponding pixel unit 201. By issuing a shutdown command to the corresponding current generating subunit 103, the current supply to the pixel unit 201 can be cut off, thus saving power.

[0089] The state of the current-generating subunit 103 that is turned off is recorded so that power can be quickly restored if the area needs to be lit later. The position determination module 401 has a fast response capability to ensure that it does not affect the image refresh speed and quality.

[0090] By identifying non-light-emitting areas and turning off the corresponding current-generating subunit 103, static power consumption is significantly reduced, especially in the case of a completely black screen or some areas that do not emit light. Furthermore, even in non-static scenes, the current supply can be dynamically adjusted according to the image content, further optimizing energy utilization efficiency.

[0091] In summary, through brightness analysis, effective management of the current generation subunit 103 was achieved, thereby achieving the goals of energy saving and improving system performance. This design reduces the static power consumption of the display driver circuit 100.

[0092] See Figure 5 As shown, Figure 5 A schematic diagram of the structure of a display driving circuit 100 Figure 5 In one possible implementation, the display driving circuit 100 further includes: a power management module 501, which is used to supply power to the pixel unit 201; and a screen judgment unit 102, which is also used to determine that when the brightness of all pixels in the pixel unit array 200 is lower than the set brightness, to turn off multiple current generating sub-units 103 and reduce the supply voltage to the power management module 501.

[0093] The power management module 501 provides the necessary power to the entire pixel unit array 200. It can adjust the output voltage and current according to actual needs to ensure that each pixel unit 201 receives a stable power supply.

[0094] In addition to basic power supply functions, the power management module 501 can also dynamically adjust its output voltage.

[0095] The power management module 501 may include a voltage conversion unit. Through the built-in voltage conversion unit, the power management module 501 can adjust the output voltage in real time according to the system status to adapt to different load requirements.

[0096] When it is detected that full power is not required (e.g., when the screen is in a black screen or low brightness mode), the power management module 501 can reduce the output voltage, thereby reducing overall power consumption.

[0097] In addition to the ability of the selectively shut-off current generating subunit 103 described earlier, the image judgment unit 102 can also perform global brightness monitoring, which is used to check all pixels in the entire pixel unit array 200 to determine whether their brightness is lower than a set brightness threshold.

[0098] If the image judgment unit 102 confirms that the brightness of all pixels is lower than the set brightness, it will not only shut down the corresponding current generating subunits 103, but also send a command to the power management module 501 to instruct it to reduce the output voltage.

[0099] By shutting down all current-generating subunits 103 and reducing the supply voltage, greater energy efficiency can be achieved when the screen is almost completely black, minimizing power consumption. This also enables the display driver circuit 100 to not only provide a stable current but also flexibly adjust its operating mode according to actual usage conditions to achieve the best energy efficiency ratio.

[0100] See Figure 6 As shown, Figure 6 A schematic diagram of the structure of a display driving circuit 100 Figure 5Each current generating subunit 103 is a current mirror unit 601. The display driving circuit 100 also includes a reference current generating module 602. The current mirror unit 601 includes an NMOS input reference current mirror 603 and a PMOS current mirror 604. The current input terminal of the NMOS input reference current mirror 603 is used to connect to the reference current generating module 602. The current output terminal of the NMOS input reference current mirror 603 is used to connect to the current input terminal of the PMOS current mirror 604. The PMOS current mirror 604 is used to output current to the corresponding pixel unit 201 and other current generating subunits 103.

[0101] The NMOS input reference current mirror 603 is responsible for receiving the reference current from the reference current generation module 602 and replicating it at the output.

[0102] The output of the NMOS input reference current mirror 603 is connected to a PMOS current mirror 604, which further amplifies or transmits the replicated current to the corresponding pixel unit 201 and other current generating sub-units 103.

[0103] The current input terminal of the NMOS input reference current mirror 603 is used to connect to the reference current generation module 602. This means that it receives a stable reference current as input, while the current output terminal of the NMOS input reference current mirror 603 is used to connect to the current input terminal of the PMOS current mirror 604. Through this connection, the NMOS current mirror can replicate the input reference current and transmit it to the PMOS current mirror 604.

[0104] The PMOS current mirror 604 receives the replicated current from the NMOS input reference current mirror 603 and amplifies it appropriately or directly transmits it to the corresponding pixel unit 201 as needed. In addition to providing current to the corresponding pixel unit 201, the PMOS current mirror 604 can also output current to other current generating sub-units 103 to achieve current mirroring and synchronous control in the entire circuit.

[0105] The reference current generation module 602 is used to generate a stable reference current. In order to ensure the stability of the reference current, the reference current generation module 602 may also include a temperature compensation circuit and other voltage regulation measures to cope with changes in ambient temperature or other external interference factors.

[0106] The reference current generation module 602 generates a fixed current value through an internal combination of resistors, transistors, and other components. Because this current is stable, it is not easily affected by power supply voltage fluctuations. The generated reference current is then distributed to each current generation subunit 103 (i.e., current mirror unit 601). The reference current generation module 602 first generates a stable and consistent reference current.

[0107] The reference current of the reference current generation module 602 is fed into the NMOS input reference current mirror 603 in each current generation sub-unit 103. The NMOS input reference current mirror 603 is responsible for replicating the reference current to its output.

[0108] The replicated current is transmitted to the PMOS current mirror 604 through the output of the NMOS input reference current mirror 603. The PMOS current mirror 604 receives the replicated current and amplifies it appropriately or transmits it directly to the corresponding pixel unit 201 as needed. In addition, the PMOS current mirror 604 can also output current to other current generating sub-units 103 to ensure current consistency throughout the circuit.

[0109] By using a current mirror structure, each pixel unit 201 can obtain almost the same bias current, ensuring high consistency in image quality. The stable reference current provided by the reference current generation module 602 enables the entire system to maintain consistent performance under different conditions, improving system reliability and durability. Furthermore, when high brightness display is not required, power consumption can be reduced by lowering the reference current, thereby further optimizing energy efficiency.

[0110] As one possible implementation, the reference current generation module 602 includes a built-in adjustable resistor circuit, which changes the magnitude of the reference current by adjusting the resistance value of the adjustable resistor.

[0111] The main function of the built-in adjustable resistor circuit is to change the magnitude of the reference current by adjusting the value of the internal resistor. This flexibility allows the system to dynamically adjust the current output according to different operating conditions or energy-saving modes, thereby optimizing performance and power consumption.

[0112] By adjusting the resistance value, higher precision control of the reference current can be achieved, ensuring that each pixel unit 201 receives a consistent and stable bias current.

[0113] Built-in adjustable resistor circuitry includes one or more adjustable resistors (such as digital potentiometers, analog potentiometers, or other types of variable resistors). These resistors can be adjusted via external signals or internal control logic.

[0114] To ensure the stability of the reference current, negative feedback control methods are typically introduced. For example, an operational amplifier (Op-Amp) is used to compare the actual output current with the desired value, and the value of the adjustable resistor is adjusted according to the error signal to maintain a constant current output.

[0115] The reference current generation module 602 generates a reference voltage or current source through internal precision circuitry. This reference value is then fed into a built-in adjustable resistor circuit. By changing the resistance value of the adjustable resistor, the magnitude of the current flowing through the resistor can be adjusted. For example, increasing the resistance value will cause the current flowing through the resistor to decrease, thereby reducing the reference current, while decreasing the resistance value will cause the current flowing through the resistor to increase, thereby increasing the reference current.

[0116] To maintain the stability of the reference current, the feedback mechanism continuously monitors the actual output current and adjusts the value of the adjustable resistor as needed. This ensures that the reference current remains constant even when ambient temperature changes or power supply voltage fluctuates.

[0117] By using a built-in adjustable resistor circuit, each pixel unit 201 can obtain almost the same bias current, ensuring a high degree of consistency in image quality. The stable reference current provided by the built-in adjustable resistor circuit enables the entire system to maintain consistent performance under different conditions, improving the system's reliability and durability.

[0118] The reference current can be dynamically adjusted according to different operating conditions or energy-saving modes. For example, the current can be reduced in low-brightness mode to save power, while the current can be increased in high-brightness mode to improve the display effect. Combined with the function of the screen judgment unit 102, when high-brightness display is not required, power consumption can be reduced by lowering the reference current, thereby further optimizing energy utilization efficiency.

[0119] By introducing a built-in adjustable resistor circuit, the reference current generation module 602 not only achieves stable reference current control, but also has flexible dynamic adjustment capabilities and efficient energy-saving optimization characteristics.

[0120] The image judgment unit 102 can not only analyze the brightness of local areas, but also perform global brightness monitoring, check each pixel in the entire pixel unit array 200, and compare the calculated brightness value with the preset brightness threshold.

[0121] If the brightness of all pixels is found to be lower than the set brightness, the entire screen is considered to be in a "nearly black" state. An instruction is sent to the current generation unit 101 to shut down all current generation subunits 103, stopping the current supply to any pixel unit 201. Simultaneously, an instruction is sent to the reference current generation module 602 to stop operating. This step further reduces static power consumption. By shutting down all current generation subunits 103 and the reference current generation module 602, a deep power-saving mode can be achieved when the screen is almost completely black, minimizing power consumption. The display driver circuit 100 can further optimize power consumption and achieve a deep power-saving mode when the screen is almost completely black.

[0122] For example, taking a typical MicroLED display architecture as an example, assuming the screen is composed of 31*41 pixel units 201, and the driving current of the current generating sub-unit 103 corresponding to each pixel unit 201 is 3.2μA, if the current generating sub-unit 103 corresponding to each pixel unit 201 is in working state, the total static power consumption is 31*41*3.2μA=4.06mA. However, if only half of the pixel units 201 emit light, and the current generating sub-units 103 corresponding to the other pixel units 201 are turned off, the static power consumption can be reduced to about 2mA, thereby significantly improving the static power consumption.

[0123] In summary, this application, by intelligently identifying the displayed content and dynamically adjusting the state of the current mirror, can minimize the static power consumption of the pixel circuit under different display conditions. Especially in the case of a black screen or partial illumination, the display driver circuit 100 provided by this application can significantly reduce unnecessary power consumption, thereby extending battery life, improving energy efficiency, and enhancing the user experience. In a typical 31x41 blob architecture, if only half of the pixel units 201 are illuminated, this application can reduce static power consumption by approximately 2 mA.

[0124] Based on the same concept, this application also provides a display device, including a pixel unit array, the pixel unit array including X rows and Y columns of pixel units, where X and Y are natural numbers, and the display driving circuit of the above embodiment. The display driving circuit provided by this application includes a plurality of current generating sub-units, the plurality of current generating sub-units being connected one-to-one with the X rows and Y columns of pixel units, any one of the plurality of current generating sub-units outputs a reference current of a set proportion as a bias current, which is provided to the corresponding pixel unit, and a screen judgment unit is used to turn off at least one of the plurality of current generating sub-units when it is determined that there is a non-light-emitting area in the pixel unit array.

[0125] The above description is only a specific implementation of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A display driving circuit for driving a pixel unit array, the pixel unit array comprising X rows and Y columns of pixel units, each pixel unit corresponding to at least one pixel, wherein X and Y are natural numbers, characterized in that... The display driving circuit includes: a current generation unit and an image judgment unit; The current generating unit includes multiple current generating sub-units, which are connected one-to-one with the pixel units in the X row and Y column. Any one of the multiple current generating sub-units outputs a reference current of a set ratio as a bias current and provides it to the corresponding pixel unit. The image judgment unit is used to turn off at least one of the multiple current generating sub-units when it determines that there is a non-light-emitting area in the pixel unit array.

2. The display driving circuit according to claim 1, characterized in that, The image judgment unit includes a brightness determination module, which is used to determine the brightness of each pixel. When the brightness of all pixels corresponding to the target pixel unit is lower than the set brightness, the current generation subunit corresponding to the target pixel unit is turned off.

3. The display driving circuit according to claim 1 or 2, characterized in that, The image judgment unit includes a position determination module, which is used to determine the coordinate information of the pixels whose brightness is lower than a set brightness, determine the target pixel unit based on the coordinate information of the unlit pixels, and turn off the current generating subunit corresponding to the target pixel unit.

4. The display driving circuit according to claim 1, characterized in that, The display driving circuit further includes: a power management module, which is used to supply power to the pixel unit; and the screen judgment unit, which is also used to determine that when the brightness of all pixels in the pixel unit array is lower than a set brightness, shut down the plurality of current generating sub-units and reduce the power supply voltage to the power management module.

5. The display driving circuit according to any one of claims 1-4, characterized in that, Each of the current generating sub-units is a current mirror unit.

6. The display driving circuit according to claim 5, characterized in that, The display driving circuit further includes a reference current generation module. The current mirror unit includes an NMOS input reference current mirror and a PMOS current mirror. The current input terminal of the NMOS input reference current mirror is used to connect to the reference current generation module, and the current output terminal of the NMOS input reference current mirror is used to connect to the current input terminal of the PMOS current mirror. The PMOS current mirror is used to output current to the corresponding pixel unit and other current generation sub-units.

7. The display driving circuit according to any one of claims 1-6, characterized in that, The reference current generation module includes a built-in adjustable resistor circuit, which changes the magnitude of the reference current by adjusting the resistance value of the adjustable resistor.

8. The display driving circuit according to claim 6 or 7, characterized in that, The image judgment unit is also used to determine that when the brightness of all pixels in the pixel unit array is lower than the set brightness, the multiple current generation subunits and the reference current generation module are turned off.

9. The display driving circuit according to any one of claims 1-8, characterized in that, Each pixel unit includes M rows and N columns of pixel circuits. The input terminal of each pixel circuit is connected to the output terminal of the corresponding current generating subunit. The output terminal of the pixel circuit is connected to the anode of a light-emitting diode (LED), and the cathode of the LED is grounded. The output terminal of the pixel circuit is also connected to the input terminal of a discharge switch, and the output terminal of the discharge switch is grounded. Each LED corresponds to one pixel.

10. A display device, characterized in that, The system includes a pixel unit array, the pixel unit array comprising X rows and Y columns of pixel units, where X and Y are natural numbers, and a display driving circuit as described in any one of claims 1-9.

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