CN114255682A - Detection device and method for regional dimming function - Google Patents
Detection device and method for regional dimming function Download PDFInfo
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- CN114255682A CN114255682A CN202111478653.7A CN202111478653A CN114255682A CN 114255682 A CN114255682 A CN 114255682A CN 202111478653 A CN202111478653 A CN 202111478653A CN 114255682 A CN114255682 A CN 114255682A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Abstract
The invention relates to the technical field of liquid crystal display, and discloses a detection device and a detection method for a local dimming function, aiming at solving the problems of poor universality and accuracy of the existing local dimming function detection, wherein the scheme mainly comprises the following steps: the interface module receives interface signal data of the liquid crystal display to be detected, and obtains a regional dimming function detection result of the liquid crystal display to be detected according to a high level amplitude value, SPI data, a frame synchronization signal, a backlight brightness adjusting signal and a test command of each waveform in the interface signal data, and sends the detection result to the display module for displaying. The invention improves the universality and the accuracy of the local dimming function detection, and is suitable for the liquid crystal display.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a device and a method for detecting a local dimming function.
Background
The principle of local dimming (local dimming) is to divide the backlight of a Liquid Crystal Display (LCD) into N small areas (blocks); when the backlight module works, the brightness of the backlight is adjusted according to the gray scale of the content of the liquid crystal display corresponding to the corresponding small area; thereby achieving the purposes of saving energy and enhancing image quality. When detecting a liquid crystal display with local dimming, besides basic function detection, it is necessary to check whether the local dimming function is normal, in the prior art, a corresponding detection platform or a dedicated complete machine platform is usually required to be preset on a liquid crystal television to realize the detection of the local dimming function, and different detection platforms are required to be matched for liquid crystal displays of different models, so that the universality is poor. Meanwhile, the existing detection mode is usually based on the marquee or only detects according to SPI data, detection personnel need to observe the appearance in the marquee-based mode, and the data is single only according to the SPI data, so that the local dimming function of the liquid crystal display cannot be completely reflected, and the accuracy is poor.
Disclosure of Invention
The invention aims to solve the problem that the existing local dimming function detection is poor in universality and accuracy, and provides a device and a method for detecting a local dimming function.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect, a detection apparatus for local dimming function is provided, including: the detection device comprises a power supply module, a control module, a display module and an interface module, wherein the power supply module is respectively connected with the control module and the display module, and the control module is connected with a liquid crystal display to be detected through the interface module;
the control module is used for receiving interface signal data of the liquid crystal display to be detected through the interface module, obtaining a regional dimming function detection result of the liquid crystal display to be detected according to high level amplitude values of all waveforms in the interface signal data, SPI data, a frame synchronization signal, a backlight brightness adjusting signal and a test command, and sending the detection result to the display module for displaying.
As a further optimization, the obtaining a local dimming function detection result of the liquid crystal display to be detected according to the high level amplitude of each waveform in the interface signal data, the SPI data, the frame synchronization signal, the backlight brightness adjustment signal, and the test command specifically includes:
reading the high level amplitude of each channel waveform and a preset number of frame data, respectively calculating the checksum of each frame data, the first duty ratio of a frame synchronization signal and the second duty ratio of a backlight brightness adjusting signal, receiving a test command sent by the liquid crystal display to be detected, and obtaining a regional dimming function detection result of the liquid crystal display to be detected according to the high level amplitude, the checksum, the first duty ratio, the second duty ratio and the test command.
As a further optimization, obtaining a local dimming function detection result of the liquid crystal display to be detected according to the high level amplitude, the checksum, the first duty cycle and the second duty cycle, specifically including:
obtaining a voltage detection result of each waveform according to the high-level amplitude, obtaining a data integrity detection result according to the checksum, obtaining a waveform stability detection result according to the first duty ratio and the second duty ratio, obtaining an instruction receiving detection result according to the test command, judging that the regional dimming function of the liquid crystal display to be detected is normal if the voltage detection result, the data integrity detection result, the waveform stability detection result and the instruction receiving detection result are normal, and otherwise, judging that the regional dimming function of the liquid crystal display to be detected is abnormal.
As a further optimization, obtaining a voltage detection result of each waveform according to the high level amplitude specifically includes:
and respectively judging whether the difference value between the high level amplitude of each waveform and the corresponding preset threshold is within a first preset range, if the difference value between the high level amplitude of all waveforms and the corresponding preset threshold is within the first preset range, judging that the voltage detection result is normal, and otherwise, judging that the voltage detection result is abnormal.
As a further optimization, obtaining a data integrity detection result according to the checksum specifically includes:
and respectively judging whether the checksum corresponding to each frame of data is consistent with the received checksum, if the checksums corresponding to all the frame of data are consistent with the received checksum, judging that the data integrity detection result is normal, and otherwise, judging that the data integrity detection result is abnormal.
As a further optimization, obtaining a waveform stability detection result according to the first duty cycle and the second duty cycle specifically includes:
and respectively judging whether the first difference values of the first duty ratios of the current frame data and the previous frame data are within a second preset range, respectively judging whether the second difference values of the second duty ratios of the current frame data and the previous frame data are within a third preset range, if the first difference values corresponding to all the frame data are within the second preset range and the second difference values are within the third preset range, judging that the waveform stability detection result is normal, and otherwise, judging that the waveform stability detection result is abnormal.
As a further optimization, the calculating the first duty ratio of the frame synchronization signal of each frame data and the second duty ratio of the backlight brightness adjustment signal respectively specifically includes:
and acquiring the time of two adjacent rising edges and falling edges of the waveform corresponding to each frame of data, calculating the frequency and the period of a frame synchronization signal and a backlight brightness adjusting signal corresponding to each frame of data according to the time, and calculating a first duty ratio of the frame synchronization signal and a second duty ratio of the backlight brightness adjusting signal according to the high-level duration and the period respectively.
As a further optimization, the method further comprises the following steps: the key module and the indicating module;
the key module is arranged on the control module and used for operating the detection device by an operator;
the indication module is configured to indicate detection status information, where the detection status information at least includes: in the local dimming function detection, the local dimming function detection result is normal, and the local dimming function detection result is abnormal.
As a further optimization, the method further comprises the following steps: a storage module;
the storage module is used for storing the read data and the detection result of the local dimming function.
In a second aspect, a method for detecting a local dimming function is provided, which includes the following steps:
step 1, receiving interface signal data of a liquid crystal display to be detected through an interface module;
step 2, obtaining a regional dimming function detection result of the liquid crystal display to be detected according to the high level amplitude, the SPI data, the frame synchronization signal and the backlight brightness adjusting signal of each waveform in the interface signal data;
and 3, sending the detection result to a display module for displaying.
The invention has the beneficial effects that: according to the detection device and the detection method for the regional dimming function, different detection platforms do not need to be set up for liquid crystal displays of different models, the universality of the detection device is improved, the interface signal data acquired by the interface module are used for respectively carrying out voltage detection, data integrity detection, waveform stability detection and instruction receiving detection on the liquid crystal display to be detected, and the accuracy of the regional dimming function detection is improved.
Drawings
Fig. 1 is a schematic structural diagram of a local dimming function detection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a method for detecting a local dimming function according to an embodiment of the invention;
fig. 3 is another flow chart of the method for detecting local dimming function according to the embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention provides a detection device for an area dimming function, which comprises: the detection device comprises a power supply module, a control module, a display module and an interface module, wherein the power supply module is respectively connected with the control module and the display module, and the control module is connected with a liquid crystal display to be detected through the interface module; the control module is used for receiving interface signal data of the liquid crystal display to be detected through the interface module, obtaining a regional dimming function detection result of the liquid crystal display to be detected according to high level amplitude values of all waveforms in the interface signal data, SPI data, a frame synchronization signal, a backlight brightness adjusting signal and a test command, and sending the detection result to the display module for displaying.
Specifically, the signal data is acquired through the interface module, and voltage detection, data integrity detection, waveform stability detection and instruction receiving detection of the liquid crystal display are respectively completed based on the high level amplitude, the SPI data, the frame synchronization signal, the backlight brightness adjusting signal and the test command of each waveform in the acquired signal data, so that the accuracy of regional dimming function detection is improved.
Examples
As shown in fig. 1, the device for detecting a local dimming function according to an embodiment of the present invention includes: the power supply module is respectively connected with the control module and the display module, the control module is connected with the liquid crystal display to be detected through the interface module, and the key module, the indication module and the storage module are respectively connected with the control module.
In the embodiment, the power supply module adopts a 5V-2A adapter, 5V output is divided into 2 paths, and one path of 5V is converted from DC-DC to 3.3V to supply power for the control module and the storage module; and one path of 5V directly supplies power to the display module. The display module adopts a monochromatic dot matrix LCD and is used for displaying the test result and other information; the indicating module is an indicating lamp, the indicating lamp has three colors to represent the working state of the detecting device, for example, blue color represents that the detecting device is in detection, green color represents that the detecting result is all qualified, and red color represents that the detecting device has faults and errors; the key module comprises an up-down selection and determination key, so that the detection operation is convenient. The interface of this embodiment mainly includes interface module and external output interface, and wherein, interface module is test interface, and test interface adopts the FFC line to link to each other with LCD's core of waiting to test, and external output interface can be used for being connected to terminals such as computer through external serial ports detection line, is convenient for can look over system information and test result.
The control module is used for receiving interface signal data of the liquid crystal display to be detected through the interface module, obtaining a regional dimming function detection result of the liquid crystal display to be detected according to high level amplitude values of all waveforms in the interface signal data, SPI data, a frame synchronization signal, a backlight brightness adjusting signal and a test command, and sending the detection result to the display module for displaying.
In this embodiment, the step of obtaining, by the control module, the local dimming function detection result of the liquid crystal display to be detected according to the interface signal data specifically includes:
reading the high level amplitude and the preset number of frame data of each channel waveform, respectively calculating the check sum of each frame data, the first duty ratio of a frame synchronization signal VSYNC and the second duty ratio of a backlight brightness adjusting signal BL _ ADJ, receiving a test command sent by the liquid crystal display to be detected, and obtaining the regional dimming function detection result of the liquid crystal display to be detected according to the high level amplitude, the check sum, the first duty ratio, the second duty ratio and the test command.
In this embodiment, 120 frames of data are continuously read, and the local dimming function detection result of the liquid crystal display to be detected is obtained according to the high level amplitude of each waveform, the checksum, the first duty ratio, the second duty ratio and the test command corresponding to each frame of data.
Specifically, in this embodiment, a voltage detection result of each waveform is obtained according to the high-level amplitude, a data integrity detection result is obtained according to the checksum, a waveform stability detection result is obtained according to the first duty cycle and the second duty cycle, and an instruction receiving detection result is obtained according to the test command.
The step of obtaining the voltage detection result of each waveform according to the high level amplitude specifically includes:
and respectively judging whether the difference value between the high level amplitude of each waveform and the corresponding preset threshold is within a first preset range, if the difference value between the high level amplitude of all waveforms and the corresponding preset threshold is within the first preset range, judging that the voltage detection result is normal, and otherwise, judging that the voltage detection result is abnormal.
The step of obtaining the data integrity detection result according to the checksum specifically includes:
and respectively judging whether the checksum corresponding to each frame of data is consistent with the received checksum, if the checksums corresponding to all the frame of data are consistent with the received checksum, judging that the data integrity detection result is normal, and otherwise, judging that the data integrity detection result is abnormal.
The step of obtaining the waveform stability detection result according to the first duty ratio and the second duty ratio specifically includes:
and respectively judging whether the first difference values of the first duty ratios of the current frame data and the previous frame data are within a second preset range, respectively judging whether the second difference values of the second duty ratios of the current frame data and the previous frame data are within a third preset range, if the first difference values corresponding to all the frame data are within the second preset range and the second difference values are within the third preset range, judging that the waveform stability detection result is normal, and otherwise, judging that the waveform stability detection result is abnormal.
The step of obtaining the instruction receiving detection result according to the test command specifically includes:
and sending a test command to the control module through the liquid crystal display to be tested, if the control module can read the corresponding test command, judging that the instruction receiving detection result is normal, and otherwise, judging that the instruction receiving detection result is abnormal.
It can be understood that after the local dimming function detection result of the liquid crystal display to be detected is obtained, each detection result and the corresponding interface signal data are stored in the storage module and are sent to the display module through the external output interface to be displayed.
Based on the above technical solution, the present embodiment further provides a method for detecting a local dimming function, as shown in fig. 2 and 3, including the following steps:
step 1, receiving interface signal data of a liquid crystal display to be detected through an interface module;
step 2, obtaining a regional dimming function detection result of the liquid crystal display to be detected according to the high level amplitude, the SPI data, the frame synchronization signal and the backlight brightness adjusting signal of each waveform in the interface signal data;
and 3, sending the detection result to a display module for displaying.
It can be understood that, since the method for detecting the local dimming function according to the embodiment of the present invention is implemented based on the device for detecting the local dimming function according to the embodiment, the method disclosed in the embodiment is relatively simple to describe since it corresponds to the device disclosed in the embodiment, and the relevant points can be referred to the partial description of the device.
Claims (10)
1. Detection apparatus of regional dimming function, its characterized in that includes: the detection device comprises a power supply module, a control module, a display module and an interface module, wherein the power supply module is respectively connected with the control module and the display module, and the control module is connected with a liquid crystal display to be detected through the interface module;
the control module is used for receiving interface signal data of the liquid crystal display to be detected through the interface module, obtaining a regional dimming function detection result of the liquid crystal display to be detected according to high level amplitude values of all waveforms in the interface signal data, SPI data, a frame synchronization signal, a backlight brightness adjusting signal and a test command, and sending the detection result to the display module for displaying.
2. The apparatus according to claim 1, wherein the obtaining of the local dimming function detection result of the lcd to be detected according to the high level amplitude of each waveform in the interface signal data, the SPI data, the frame synchronization signal, the backlight brightness adjustment signal, and the test command specifically comprises:
reading the high level amplitude of each channel waveform and a preset number of frame data, respectively calculating the checksum of each frame data, the first duty ratio of a frame synchronization signal and the second duty ratio of a backlight brightness adjusting signal, receiving a test command sent by the liquid crystal display to be detected, and obtaining a regional dimming function detection result of the liquid crystal display to be detected according to the high level amplitude, the checksum, the first duty ratio, the second duty ratio and the test command.
3. The apparatus according to claim 2, wherein the obtaining of the local dimming function detection result of the lcd to be detected according to the high level amplitude, the checksum, the first duty cycle and the second duty cycle comprises:
obtaining a voltage detection result of each waveform according to the high-level amplitude, obtaining a data integrity detection result according to the checksum, obtaining a waveform stability detection result according to the first duty ratio and the second duty ratio, obtaining an instruction receiving detection result according to the test command, judging that the regional dimming function of the liquid crystal display to be detected is normal if the voltage detection result, the data integrity detection result, the waveform stability detection result and the instruction receiving detection result are normal, and otherwise, judging that the regional dimming function of the liquid crystal display to be detected is abnormal.
4. The apparatus for detecting local dimming function according to claim 3, wherein obtaining the voltage detection result of each waveform according to the high level amplitude comprises:
and respectively judging whether the difference value between the high level amplitude of each waveform and the corresponding preset threshold is within a first preset range, if the difference value between the high level amplitude of all waveforms and the corresponding preset threshold is within the first preset range, judging that the voltage detection result is normal, and otherwise, judging that the voltage detection result is abnormal.
5. The apparatus for detecting a local dimming function according to claim 3, wherein obtaining a data integrity detection result according to the checksum specifically comprises:
and respectively judging whether the checksum corresponding to each frame of data is consistent with the received checksum, if the checksums corresponding to all the frame of data are consistent with the received checksum, judging that the data integrity detection result is normal, and otherwise, judging that the data integrity detection result is abnormal.
6. The apparatus for detecting a local dimming function according to claim 3, wherein the obtaining of the waveform stability detection result according to the first duty cycle and the second duty cycle specifically comprises:
and respectively judging whether the first difference values of the first duty ratios of the current frame data and the previous frame data are within a second preset range, respectively judging whether the second difference values of the second duty ratios of the current frame data and the previous frame data are within a third preset range, if the first difference values corresponding to all the frame data are within the second preset range and the second difference values are within the third preset range, judging that the waveform stability detection result is normal, and otherwise, judging that the waveform stability detection result is abnormal.
7. The apparatus for detecting a local dimming function according to claim 2, wherein the calculating a first duty ratio of the frame synchronization signal of each frame data and a second duty ratio of the backlight brightness adjustment signal respectively comprises:
and acquiring the time of two adjacent rising edges and falling edges of the waveform corresponding to each frame of data, calculating the frequency and the period of a frame synchronization signal and a backlight brightness adjusting signal corresponding to each frame of data according to the time, and calculating a first duty ratio of the frame synchronization signal and a second duty ratio of the backlight brightness adjusting signal according to the high-level duration and the period respectively.
8. The apparatus for detecting local dimming function according to claim 1, further comprising: the key module and the indicating module;
the key module is arranged on the control module and used for operating the detection device by an operator;
the indication module is configured to indicate detection status information, where the detection status information at least includes: in the local dimming function detection, the local dimming function detection result is normal, and the local dimming function detection result is abnormal.
9. The apparatus for detecting local dimming function according to claim 1, further comprising: a storage module;
the storage module is used for storing the read data and the detection result of the local dimming function.
10. The method for detecting the local dimming function is characterized by comprising the following steps of:
step 1, receiving interface signal data of a liquid crystal display to be detected through an interface module;
step 2, obtaining a regional dimming function detection result of the liquid crystal display to be detected according to the high level amplitude, the SPI data, the frame synchronization signal and the backlight brightness adjusting signal of each waveform in the interface signal data;
and 3, sending the detection result to a display module for displaying.
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