LED display screen lamp point abnormal column color cast adaptive optimization method and device

Abstract

The application provides an LED display screen lamp point abnormal column color cast self-adaptive optimization method, comprising sampling a port voltage of an output port of each lamp point; sampling a parasitic capacitance value of each lamp point; and self-adaptively adjusting an opening dynamic response of an abnormal port according to the port voltage sampling value and the parasitic capacitance sampling value. The LED display screen lamp point abnormal column color cast self-adaptive optimization method provided by the application firstly detects lamp point voltage and judges whether it is abnormal; then detects lamp point parasitic capacitance and outputs a parasitic capacitance sampling value through ADC sampling; and finally, according to the sampling obtained parasitic capacitance value, separately processes the lamp point abnormal column opening dynamic response to make the abnormal column constant current response speed consistent with that of a normal column. Thus, without changing the constant current loop, the low gray display consistency can be improved, the display problems such as lamp point abnormal column color cast can be solved, and the purpose of higher LED display screen picture restoration can be achieved.

Description

Technical Field

[0001] This invention relates to the field of LED display technology, and in particular to an adaptive optimization method and apparatus for abnormal color deviation of LED display lamps. Background Technology

[0002] Based on the scanning method, LED displays can be divided into dynamic displays and static displays. Static displays activate each scan line simultaneously, with each LED controlled by a different driver output port. This requires more driver chips and increases the wiring complexity of the display substrate. Dynamic displays show only one line at a time, then the next line at the next time, until all lines are displayed, then the first line is displayed again, and so on, in a cyclical manner to display the entire image. In dynamic displays, multiple LEDs share the same driver port, displaying in different intervals within a unit of time. This method utilizes the persistence of vision of the human eye. For example, a 4-scan LED display consists of 4 lines displayed at different times. The diagonal stripes are composed of 4 lines, each with one LED lit. In dynamic display applications, a low refresh rate can cause image flickering and jitter, leading to eye fatigue after prolonged viewing.

[0003] Furthermore, LED displays achieve their color reproduction by controlling the brightness of red, green, and blue LEDs in each pixel. However, their color reproduction is not as perfect as what the human eye sees. In other words, no matter how superior the display's performance, color difference is inevitable; the colors we see through the screen are never the true colors of the image. This is primarily because the brightness levels of the red, green, and blue LEDs are limited. For example, the highest grayscale level commonly used in LED displays is currently 65,536, corresponding to 16 bits of grayscale data.

[0004] Traditional multi-channel constant current LED driver chips often employ PWM (Pulse Width Modulation) for display control, achieving different grayscale brightness effects by controlling the LED's on / off time. This control is typically achieved through a grayscale clock. A higher grayscale clock frequency results in a smaller minimum on / off width, meaning more pulses are generated per frame while maintaining a constant display time and line scan count. Therefore, a higher frequency allocates more grayscale clock signals to each line, resulting in a higher grayscale level for the displayed image. However, when a single LED in the display malfunctions, parasitic capacitance coupling in the floating row causes a color cast (darkering) in the column containing the malfunctioning LED, leading to display abnormalities.

[0005] Therefore, a new solution is needed. Summary of the Invention

[0006] The purpose of this invention is to provide an adaptive optimization method for color deviation in abnormal columns of LED displays. This method improves the color deviation problem of abnormal columns by independently adjusting the dynamic response of the abnormal column to be close to that of the normal column.

[0007] This invention provides an adaptive optimization method for abnormal color shift in LED display lamp columns, comprising the following steps:

[0008] Sample the port voltage of the output port of each lamp;

[0009] Sample the parasitic capacitance value of each lamp point; and

[0010] The system adaptively adjusts the dynamic response for opening abnormal ports based on port voltage and parasitic capacitance sampling values.

[0011] In the LED display screen abnormal column color deviation adaptive optimization method provided by the present invention, the step of sampling the parasitic capacitance value of each lamp point includes:

[0012] Detect the parasitic capacitance value of each lamp point; and

[0013] Based on the parasitic capacitance value of the normal port, the parasitic capacitance value of the output port of each lamp is discretely sampled by ADC sampling.

[0014] In the LED display screen abnormal column color deviation adaptive optimization method provided by the present invention, the step of adaptively adjusting the opening dynamic response of the abnormal port according to the port voltage sampling value and the parasitic capacitance sampling value includes:

[0015] Determine whether a port is normal or abnormal based on the port voltage sampling value;

[0016] Based on the sampled parasitic capacitance value, adjust the average constant current value of the abnormal port so that the difference between the grayscale of the abnormal port and the grayscale of the normal port is within a preset range.

[0017] According to another aspect of the present invention, an adaptive optimization device for abnormal column color deviation of LED display lamps is also provided, comprising:

[0018] The port voltage sampling module is used to sample the port voltage of the output port of each lamp.

[0019] The parasitic capacitance sampling module is used to sample the parasitic capacitance value of each lamp point;

[0020] The storage module is used to store the port voltage sampling value and the parasitic capacitance sampling value;

[0021] The adjustment module is used to adaptively adjust the dynamic response of abnormal ports based on the port voltage sampling value and parasitic capacitance sampling value.

[0022] In the LED driving pulse modulation device provided by the present invention, the parasitic capacitance sampling module includes:

[0023] The detection unit is used to detect the parasitic capacitance value of each lamp point; and

[0024] The ADC sampling unit is used to discretely sample the parasitic capacitance value of the output port of each lamp, based on the parasitic capacitance value of the normal port.

[0025] In the LED driving pulse modulation device provided by the present invention, the adjustment module includes:

[0026] The judgment unit is used to determine whether a port is a normal port or an abnormal port based on the port voltage sampling value.

[0027] The abnormal port adjustment unit is used to adjust the average constant current value of the abnormal port according to the sampled parasitic capacitance value, so that the difference between the grayscale of the abnormal port and the grayscale of the normal port is within a preset range.

[0028] According to another aspect of the present invention, an LED display device is also provided, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform the LED display lamp spot abnormal column color deviation adaptive optimization method as described above.

[0029] According to another aspect of the present invention, a non-transitory computer-readable storage medium is also provided, the non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the LED display screen light spot abnormal column color deviation adaptive optimization method as described above.

[0030] Implementing the embodiments of the present invention has the following beneficial effects: The LED display screen abnormal column color deviation adaptive optimization method provided by the present invention first detects the lamp voltage and determines whether it is abnormal; then it detects the lamp parasitic capacitance and outputs the parasitic capacitance sampling value through ADC sampling; finally, based on the sampled parasitic capacitance value, it separately processes the abnormal column of lamps to enable dynamic response so that the constant current response speed of the abnormal column is consistent with that of the normal column; thereby, without changing the constant current loop, it can improve the consistency of low gray display, solve display problems such as color deviation of abnormal lamp columns, and achieve the purpose of higher LED display screen image reproduction. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 The diagram shows the voltage / current waveforms at the ports of the abnormal and normal columns when the display screen lights malfunction.

[0033] Figure 2 This is a flowchart of an adaptive optimization method for abnormal color deviation of LED display lamp dots provided in an embodiment of the present invention;

[0034] Figure 3 The current waveforms at the ports of the abnormal and normal columns are obtained after applying the adaptive optimization method for color deviation of abnormal LED display lamp dots provided by this invention.

[0035] Figure 4 This is a schematic diagram of an LED display screen lamp point abnormal column color deviation adaptive optimization device provided in an embodiment of the present invention;

[0036] Figure 5 As shown Figure 4 The circuit diagram of the parasitic capacitance sampling module shown is shown.

[0037] Figure 6 A schematic structural diagram of an LED display device according to an embodiment of the present invention is shown. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] When LED displays are in low grayscale mode, the grayscale level is greatly affected by the dynamic response. However, if there are abnormal LEDs, the column containing the abnormal LED is affected by the parasitic capacitance of the floating row, such as... Figure 1 As shown, the dynamic response of the abnormal column is significantly slower than that of the normal column. Therefore, during low grayscale display, the LED turn-on time of the abnormal column is significantly shorter than that of the normal column, and the average current of the abnormal column is significantly lower. This results in the LEDs in the abnormal column appearing dimmer, causing display abnormalities.

[0040] Figure 2The diagram shows a flowchart of an adaptive optimization method for abnormal color shift in LED display lamp dots according to an embodiment of the present invention. Figure 2 As shown, the LED display screen abnormal column color deviation adaptive optimization method provided by the present invention includes the following steps:

[0041] Step S1: Sample the port voltage of the output port of each lamp.

[0042] Specifically, in one embodiment of the present invention, since the turn-on voltage of each lamp is different, the column containing that lamp is first determined to be abnormal by detecting the port voltage of the output port of each lamp. Specifically, if the port voltage is greater than a first preset threshold or less than a second preset threshold, i.e., the port voltage is outside the normal range, the column containing the lamp is determined to be abnormal. Ports with normal voltage are represented as low level, and ports with abnormal voltage are represented as high level, and the sampling results are saved.

[0043] Step S2: Sample the parasitic capacitance value of each lamp point.

[0044] Specifically, in one embodiment of the present invention, in order to meet the requirements of low grayscale display applications, the influence of row floating parasitic capacitance on abnormal lamp columns must be considered. Under the same constant current chip settings, the larger the parasitic capacitance, the slower the port opening response. Therefore, the port parasitic capacitance is detected, and the detection result is output to the storage module via ADC and stored. During the display process, the dynamic response speed of abnormal port opening is adaptively adjusted according to the stored sampling results. Since the detected parasitic capacitance is an analog value, it needs to be converted into a digital value through ADC sampling. Here, the parasitic capacitance value of the normal port is used as the comparison benchmark for ADC sampling. The parasitic capacitance of each port is compared with it to obtain discrete sampling values, which facilitates subsequent processing. Therefore, step S2 includes:

[0045] Step S21: Detect the parasitic capacitance value of each lamp point; and

[0046] Step S22: Based on the parasitic capacitance value of the normal port, the parasitic capacitance value of the output port of each lamp is discretely sampled by ADC sampling.

[0047] Step S3: Based on the port voltage sampling value and parasitic capacitance sampling value, adaptively adjust the opening dynamic response of the abnormal port.

[0048] Specifically, in one embodiment of the present invention, the port is determined to be a normal port or an abnormal port based on the port voltage sampling value; for an abnormal port, the average constant current value of the abnormal port is adjusted according to the parasitic capacitance sampling value of the abnormal port, so that the average constant current value of the abnormal port is close to the average constant current value of the normal port (e.g., ...). Figure 3As shown in the figure, this ensures that the difference between the grayscale of the abnormal port and the grayscale of the normal port is within a preset range.

[0049] The present invention provides an adaptive optimization method for color shift in abnormal LED display lamp columns. First, it detects the lamp voltage and determines if it is abnormal. Then, it detects the parasitic capacitance of the lamp and outputs the parasitic capacitance sample value through an ADC. Finally, based on the sampled parasitic capacitance value, it separately processes the abnormal lamp column, enabling dynamic response to ensure that the constant current response speed of the abnormal column is consistent with that of the normal column. Therefore, without changing the constant current loop, it can improve the consistency of low-grayscale display and solve display problems such as color shift in abnormal lamp columns, thereby achieving higher image reproduction on the LED display.

[0050] refer to Figure 4 Based on the same inventive concept, this invention also discloses an adaptive optimization device for abnormal column color deviation of LED display lamps, including a port voltage sampling module 410 for sampling the port voltage of the output port of each lamp; a parasitic capacitance sampling module 420 for sampling the parasitic capacitance value of each lamp; a storage module 430 for storing the port voltage sampling value and the parasitic capacitance sampling value; and an adjustment module 440 for adaptively adjusting the opening dynamic response of the abnormal port according to the port voltage sampling value and the parasitic capacitance sampling value.

[0051] Specifically, in one embodiment of the present invention, a port voltage sampling module is connected to the output port of each lamp point. By detecting the port voltage of the output port of each lamp point, it is determined whether the column in which the lamp point is located is abnormal. Specifically, if the port voltage is greater than a first preset threshold or less than a second preset threshold, that is, the port voltage is not within the normal range, the column in which the lamp point is located is determined to be abnormal, and the port voltage sampling module outputs a high level; otherwise, the port voltage sampling module outputs a low level, indicating that the port is a normal port.

[0052] Specifically, in one embodiment of the present invention, to meet the requirements of low grayscale display applications, the influence of row floating parasitic capacitance on abnormal lamp columns must be considered. Under the same constant current chip settings, the larger the parasitic capacitance, the slower the port opening response. Therefore, the port parasitic capacitance is detected, and the detection result is output to the storage module via ADC and stored. During the display process, the dynamic response speed of abnormal port opening is adaptively adjusted according to the stored sampling results. Since the detected parasitic capacitance is an analog value, it needs to be converted into a digital value through ADC sampling. Here, the parasitic capacitance value of the normal port is used as the comparison benchmark for ADC sampling. The parasitic capacitance of each detected port is compared with it to obtain discrete sampling values, which facilitates subsequent processing. Therefore, the parasitic capacitance sampling module includes:

[0053] The detection unit is used to detect the parasitic capacitance value of each lamp point; and

[0054] The ADC sampling unit is used to discretely sample the parasitic capacitance value of the output port of each lamp, based on the parasitic capacitance value of the normal port.

[0055] like Figure 5 As shown, the port parasitic capacitance is charged by detecting the current Id. According to the formula: Vcap*CL=Id*T, for the same charging time, the port parasitic capacitance is inversely proportional to the Vcap voltage. The ADC samples the Vcap voltage value and sends the sampling result back to the storage module.

[0056] Specifically, in one embodiment of the present invention, the port is determined to be a normal port or an abnormal port based on the port voltage sampling value; for an abnormal port, the average constant current value of the abnormal port is adjusted according to the parasitic capacitance sampling value of the abnormal port, so that the average constant current value of the abnormal port is close to that of the normal port (e.g., ...). Figure 3 As shown in the figure, this ensures that the difference between the grayscale of the abnormal port and the grayscale of the normal port is within a preset range. Therefore, the adjustment module includes:

[0057] The judgment unit is used to determine whether a port is a normal port or an abnormal port based on the port voltage sampling value.

[0058] The abnormal port adjustment unit is used to adjust the average constant current value of the abnormal port according to the sampled parasitic capacitance value, so that the difference between the grayscale of the abnormal port and the grayscale of the normal port is within a preset range.

[0059] The functions of each functional module described in the embodiments of the present invention can be specifically implemented according to the methods in the above method embodiments. The specific implementation process can be referred to the relevant descriptions in the above method embodiments, which will not be repeated here.

[0060] It should be noted that the above description of various modules is divided into these modules for clarity. However, in actual implementation, the boundaries between the various modules may be blurred. For example, any or all functional modules in this document may share various hardware and / or software elements. As another example, any and / or all functional modules in this document may be wholly or partially implemented by a common processor executing software instructions. Furthermore, various software sub-modules executed by one or more processors may be shared among various software modules. Accordingly, unless expressly required, the scope of this invention is not limited by mandatory boundaries between various hardware and / or software elements.

[0061] Figure 6 This is a schematic diagram of the hardware structure of the LED display device provided in an embodiment of the present invention, as shown below. Figure 6 As shown, the device includes one or more processors 61 and a memory 62. Figure 6Taking a processor 61 as an example, the processor 61 and the memory 62 can be connected via a bus or other means. Figure 6 Taking the example of a connection between China and Israel via a bus.

[0062] Processor 61 can be a Central Processing Unit (CPU). Processor 61 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips. The general-purpose processor can be a microprocessor or any conventional processor.

[0063] The memory 62, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the LED display screen light spot abnormal column color deviation adaptive optimization method in the embodiments of the present invention. The processor 61 executes various functional applications and data processing of the server by running the non-transitory software programs, instructions, and modules stored in the memory 62, thereby implementing the LED display screen light spot abnormal column color deviation adaptive optimization method in the above embodiments.

[0064] The memory 62 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the LED driving pulse modulation device. Furthermore, the memory 62 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 62 may optionally include memory remotely located relative to the processor 61, and these remote memories can be connected to the LED driving pulse modulation device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0065] The one or more modules are stored in the memory 62, and when executed by the one or more processors 61, they perform the LED display screen light spot abnormal column color deviation adaptive optimization method as described above.

[0066] The above-described product can execute the method provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects for executing the method. Technical details not described in detail in this embodiment can be found in [reference 1]. Figure 1 The relevant descriptions in the illustrated embodiments.

[0067] This invention also provides a non-transitory computer storage medium storing computer-executable instructions that can execute the LED display screen light spot abnormal column color offset adaptive optimization method described above. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium may also include combinations of the above types of memory.

[0068] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0069] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method for adaptive optimization of color deviation in abnormal LED display lamp columns, characterized in that, Includes the following steps: Sample the port voltage of the output port of each lamp; The parasitic capacitance value of each LED is sampled, specifically including: detecting the parasitic capacitance value of each LED; and using the parasitic capacitance value of the normal port as a reference, discretely sampling the parasitic capacitance value of the output port of each LED through ADC sampling; and Based on the port voltage sampling value and parasitic capacitance sampling value, the dynamic response of abnormal port is adaptively adjusted. Specifically, this includes: determining whether the port is normal or abnormal based on the port voltage sampling value; and adjusting the average constant current value of the abnormal port based on the parasitic capacitance sampling value so that the difference between the grayscale of the abnormal port and the grayscale of the normal port is within a preset range.

2. A device for adaptive optimization of color deviation in abnormal LED display lamp positions, characterized in that, include: The port voltage sampling module is used to sample the port voltage of the output port of each lamp. The parasitic capacitance sampling module is used to sample the parasitic capacitance value of each lamp point; The storage module is used to store the port voltage sampling value and the parasitic capacitance sampling value; The adjustment module is used to adaptively adjust the dynamic response of abnormal ports based on the port voltage sampling value and parasitic capacitance sampling value. The parasitic capacitance sampling module includes: The detection unit is used to detect the parasitic capacitance value of each lamp point; and An ADC sampling unit is used to discretely sample the parasitic capacitance value of the output port of each lamp point, based on the parasitic capacitance value of the normal port; the adjustment module includes: The judgment unit is used to determine whether a port is a normal port or an abnormal port based on the port voltage sampling value. The abnormal port adjustment unit is used to adjust the average constant current value of the abnormal port according to the sampled parasitic capacitance value, so that the difference between the grayscale of the abnormal port and the grayscale of the normal port is within a preset range.

3. An LED display device, characterized in that, It includes at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processor to perform the LED display screen light spot abnormal column color deviation adaptive optimization method according to claim 1.

4. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions, which are used to cause the computer to execute the LED display screen light spot abnormal column color deviation adaptive optimization method according to claim 1.

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