CN113808530B - Ghost eliminating signal implementation method under LED driving chip - Google Patents
Ghost eliminating signal implementation method under LED driving chip Download PDFInfo
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- CN113808530B CN113808530B CN202111210996.5A CN202111210996A CN113808530B CN 113808530 B CN113808530 B CN 113808530B CN 202111210996 A CN202111210996 A CN 202111210996A CN 113808530 B CN113808530 B CN 113808530B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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Abstract
The invention discloses a method for realizing a ghost eliminating signal under an LED (light-emitting diode) driving chip, belonging to the technical field of LED display, comprising the step of using the interval time between two groups of display sub-periods for eliminating shadows, wherein the interval time comprises the starting time of the elimination of the shadows, line feed time and the elimination of the shadows; the length of each time can be configured through a register; the shadow elimination signal mode comprises a normal shadow elimination mode, a truncation shadow elimination mode and a delay shadow elimination mode; each mode can be enabled by a register. The shadow eliminating starting time is not more than the line changing time, namely, a pre-charging process is carried out before shadow eliminating starts, and the rising time of the shadow eliminating voltage is reserved, so that when the shadow eliminating time comes, the shadow eliminating voltage is a normal value, and the occurrence of lower ghosting is avoided. The invention can effectively eliminate ghost signals and is suitable for the high-density LED driving chip; the shadow eliminating signal mode and the shadow eliminating time sequence of each mode can be flexibly configured according to a register and can be adjusted according to the actual condition of the LED display module.
Description
Technical Field
The invention relates to the technical field of LED display, in particular to a method for realizing a ghost elimination signal under an LED driving chip.
Background
In recent years, with the continuous and deep research on semiconductor luminescent materials, the continuous progress of LED manufacturing processes, and the development and application of new materials, ultra-high brightness LEDs of various colors have made breakthrough progress. These have LED to more and more widespread use of LEDs, mainly in three categories: (1) high-power lighting fixtures such as street lamps, automobile lamps and the like; (2) Middle and low power lamps such as indoor decorative lamps, automobile interior lighting and the like; (3) Backlight sources for portable electronic products such as mobile phones, MP4 and portable computers. High integration, small size and low power consumption are the main development directions.
With the development of high-density LED display screens, the dot pitch becomes smaller, that is, the number of LEDs in the same area is increased, which also causes a series of problems. The ghost phenomenon is a common problem in multi-row scanning of the LED display screen, and the cause of the ghost phenomenon is that due to charge and discharge factors of parasitic capacitance on a PCB, LEDs which are not required to be lightened on the display screen can be lightened, so that the display effect of the LED display screen is seriously influenced.
Disclosure of Invention
The invention aims to provide a method for realizing a ghost elimination signal under an LED driving chip so as to solve the problems in the background technology.
In order to solve the above technical problem, the present invention provides a method for implementing a ghost elimination signal under an LED driver chip, including:
the interval time between the two groups of display sub-periods is used for vanishing, wherein the interval time comprises vanishing starting time, line feed time and vanishing time; the length of each time can be configured through a register;
the shadow elimination signal mode comprises a normal shadow elimination mode, a truncation shadow elimination mode and a delay shadow elimination mode; each mode can be enabled by a register.
Optionally, the start time of the shadow elimination is not greater than the line feed time, that is, there is a pre-charging process before the start of the shadow elimination, and the rise time of the shadow elimination voltage is reserved, so that when the shadow elimination time arrives, the shadow elimination voltage is a normal value, and the occurrence of a ghost is avoided.
Optionally, the line feed time is after the vanishing start time, and a line feed signal needs to be provided during the line feed time.
Optionally, the vanishing time starts immediately after the line feed time, or starts after the vanishing delay time and ends when the next display sub-period arrives.
Optionally, the timing sequence of the vanishing signal in the normal vanishing mode is set to be pulled high after the vanishing start time and pulled low when the next display sub-period comes.
Optionally, the timing sequence of the vanishing signal of the truncated vanishing mode is pulled high after the vanishing start time, and pulled low after the line feed time is over.
Optionally, the timing sequence of the vanishing signal in the delay vanishing mode is pulled high after the vanishing delay time, and pulled low when the next display sub-period comes.
In the method for realizing the ghost elimination signal under the LED driving chip, provided by the invention, the interval time between two groups of display sub-periods is used for eliminating the shadow, wherein the interval time comprises the start time of the shadow elimination, the line feed time and the shadow elimination time; the length of each time can be configured through a register; the shadow elimination signal mode comprises a normal shadow elimination mode, a truncation shadow elimination mode and a delay shadow elimination mode; each mode can be enabled by a register. The shadow eliminating starting time is not more than the line changing time, namely, a pre-charging process is carried out before the shadow eliminating starts, and the rising time of the shadow eliminating voltage is reserved, so that when the shadow eliminating time arrives, the shadow eliminating voltage is a normal value, and the occurrence of ghost is avoided.
The invention has the beneficial effects that:
(1) Ghost signals are effectively eliminated, and the method is suitable for a high-density LED driving chip;
(2) The shadow eliminating signal mode and the shadow eliminating time sequence of each mode can be flexibly configured according to the register and can be adjusted according to the actual condition of the LED display module.
Drawings
FIG. 1 is a timing diagram of a normal blanking mode;
FIG. 2 is a timing diagram of a truncated shadow mode;
FIG. 3 is a timing diagram of a delayed subtraction mode.
Detailed Description
The following describes in detail a method for implementing a ghost elimination signal under an LED driving chip according to the present invention with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is provided for the purpose of facilitating and clearly illustrating embodiments of the present invention.
Example one
The invention provides a method for realizing a ghost elimination signal under an LED (light-emitting diode) driving chip, which comprises the steps that the interval time between two groups of display sub-periods is used for eliminating shadows, wherein the interval time comprises the starting time of the elimination of the shadows, the line feed time and the elimination of the shadows; the length of each time can be configured through a register; the vanishing signal modes include a normal vanishing mode, a truncated vanishing mode and a delayed vanishing mode, the timing diagrams of which are shown in fig. 1, fig. 2 and fig. 3, respectively; each mode can be enabled by a register. The shadow eliminating starting time is not more than the line changing time, namely, a pre-charging process is carried out before shadow eliminating starts, and the rising time of the shadow eliminating voltage is reserved, so that when the shadow eliminating time comes, the shadow eliminating voltage is a normal value, and the occurrence of lower ghosting is avoided.
Taking full gray scale data as an example, the PWM signal is pulled up for a sub-period duration DISPLAY _ TIME. After the DISPLAY _ TIME is finished, the start TIME GHOST _ EN _ TIME of the shadow elimination starts, wherein the start TIME GHOST _ EN _ TIME of the shadow elimination is controlled by a 4-bit register, and 16 bits are adjustable. The line feed TIME ROW _ TIME starts after the end of the shadow start TIME GHOST _ EN _ TIME, and the falling edge of the line feed signal ROW _ IN ends. And starting a shadow eliminating TIME GHOST _ TIME after the line change TIME ROW _ TIME is finished, wherein the shadow eliminating TIME GHOST _ TIME is controlled by a 5-bit register, 32 bits are adjustable, and the register starts counting after the falling edge of a line change signal ROW _ IN is detected.
The timing sequence of the shadow eliminating signal in the normal shadow eliminating mode is pulled high after the shadow eliminating starting time, and pulled low when the next display sub-period comes. After the GHOST _ EN _ TIME counter finishes counting, the EN _ GHOST signal is pulled high; after the GHOST _ TIME counter is counted, the EN _ GHOST signal is pulled low.
The timing sequence of the shadow eliminating signal of the truncated shadow eliminating mode is pulled high after the shadow eliminating starting time, and pulled low when the line changing time is over. After the GHOST _ EN _ TIME counter finishes counting, the EN _ GHOST signal is pulled high; after detecting the falling edge of the ROW feed signal ROW _ IN, the EN _ GHOST signal is pulled low.
The timing of the shadow elimination signal in the DELAY shadow elimination mode is pulled high after the shadow elimination DELAY TIME (i.e. GHOST _ DELAY _ TIME after the line feed TIME ROW _ TIME in FIG. 3), and is pulled low when the next display sub-period arrives. After the GHOST _ DELAY _ TIME counter finishes counting, the EN _ GHOST signal is pulled high; after the GHOST _ TIME counter finishes counting, the EN _ GHOST signal is pulled low.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (1)
1. A method for realizing a ghost elimination signal under an LED driving chip is characterized by comprising the following steps:
the interval time between the two groups of display sub-periods is used for vanishing, wherein the interval time comprises vanishing starting time, line feed time and vanishing time; the length of each time can be configured through a register;
the shadow elimination signal mode comprises a normal shadow elimination mode, a truncation shadow elimination mode and a delay shadow elimination mode; each mode can be enabled by a register;
the shadow eliminating starting time is not more than the line changing time, namely a pre-charging process is carried out before the shadow eliminating starts, and the rising time of the shadow eliminating voltage is reserved, so that when the shadow eliminating time arrives, the shadow eliminating voltage is a normal value, and the occurrence of ghost is avoided;
the line feed time is behind the vanishing starting time, and a line feed signal needs to be given during the line feed time; the shadow elimination time starts immediately after the line feed time, or starts after the shadow elimination delay time and ends when the next display sub-period arrives;
the timing sequence of the shadow eliminating signal in the normal shadow eliminating mode is pulled high after the shadow eliminating starting time, and pulled low when the next display sub-period comes; the timing sequence of a shadow eliminating signal of the truncated shadow eliminating mode is pulled high after the shadow eliminating starting time and pulled low after the line feed time is finished; the timing sequence of the shadow elimination signal of the delay shadow elimination mode is that the shadow elimination signal is pulled high after the shadow elimination delay time, and is pulled low when the next display sub-period comes.
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| CN202111210996.5A CN113808530B (en) | 2021-10-18 | 2021-10-18 | Ghost eliminating signal implementation method under LED driving chip |
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| CN202111210996.5A CN113808530B (en) | 2021-10-18 | 2021-10-18 | Ghost eliminating signal implementation method under LED driving chip |
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| CN113808530B true CN113808530B (en) | 2023-02-28 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013153974A1 (en) * | 2012-04-11 | 2013-10-17 | シャープ株式会社 | Liquid crystal display device |
| CN205080890U (en) * | 2015-10-26 | 2016-03-09 | 锐发科技股份有限公司 | LED display panel's drive circuit and integrated circuit package component thereof |
| CN107274818A (en) * | 2017-07-07 | 2017-10-20 | 厦门强力巨彩光电科技有限公司 | A kind of LED display control circuit for possessing function of short circuit detection and control method |
| CN110277052A (en) * | 2019-06-13 | 2019-09-24 | 华中科技大学 | Multirow sweeps the all-colour LED driving chip and driving method of high refresh rate |
| CN111383594A (en) * | 2018-12-27 | 2020-07-07 | 三星显示有限公司 | Drive controller and display device including the same |
| CN213583056U (en) * | 2020-10-27 | 2021-06-29 | 西安钛铂锶电子科技有限公司 | Display driving chip and LED lamp panel |
| CN113314083A (en) * | 2020-02-27 | 2021-08-27 | 三星显示有限公司 | Display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3856001B2 (en) * | 2004-01-26 | 2006-12-13 | セイコーエプソン株式会社 | Display controller, display system, and display control method |
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- 2021-10-18 CN CN202111210996.5A patent/CN113808530B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013153974A1 (en) * | 2012-04-11 | 2013-10-17 | シャープ株式会社 | Liquid crystal display device |
| CN205080890U (en) * | 2015-10-26 | 2016-03-09 | 锐发科技股份有限公司 | LED display panel's drive circuit and integrated circuit package component thereof |
| CN107274818A (en) * | 2017-07-07 | 2017-10-20 | 厦门强力巨彩光电科技有限公司 | A kind of LED display control circuit for possessing function of short circuit detection and control method |
| CN111383594A (en) * | 2018-12-27 | 2020-07-07 | 三星显示有限公司 | Drive controller and display device including the same |
| CN110277052A (en) * | 2019-06-13 | 2019-09-24 | 华中科技大学 | Multirow sweeps the all-colour LED driving chip and driving method of high refresh rate |
| CN113314083A (en) * | 2020-02-27 | 2021-08-27 | 三星显示有限公司 | Display device |
| CN213583056U (en) * | 2020-10-27 | 2021-06-29 | 西安钛铂锶电子科技有限公司 | Display driving chip and LED lamp panel |
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