CN110838277B - Pre-charging method of LED display screen - Google Patents
Pre-charging method of LED display screen Download PDFInfo
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- CN110838277B CN110838277B CN201911087161.8A CN201911087161A CN110838277B CN 110838277 B CN110838277 B CN 110838277B CN 201911087161 A CN201911087161 A CN 201911087161A CN 110838277 B CN110838277 B CN 110838277B
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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]
Abstract
The invention discloses a pre-charging method of an LED display screen, which sequentially comprises the following steps of pre-charging a circuit in a single period, namely pre-charging 1, pre-charging 2, closing the circuit, pre-charging 3 and pre-charging 4; the pre-charging circuit is provided with 5 working states which are respectively a state 1, a state 2, a state 3, a state 4 and a state 5, wherein each state of the state 1, the state 2, the state 4 and the state 5 is used for pre-charging the column lines of the display screen respectively, so that the corresponding column lines are charged to a fixed potential which is respectively VR1, VR2, VR3 and VR4, and all LED lamp beads on the corresponding column lines are in a non-luminous cut-off state; state 3 the precharge circuit is off, the output is high impedance state; the state 4 and the state 5 are two newly-added working states, the starting process of the constant current source on the column line can be simulated, and the poor high-low gray coupling display and the poor cross-plate display are effectively improved.
Description
Technical Field
The invention relates to the field of LED display screen driving, in particular to a pre-charging method of an LED display screen.
Background
At present, common LED display screen driving chip systems in the market drive scanning row lines at different times respectively. When the next row is driven, the phenomenon that the previous row appears dark and bright is called ghost. The reason is that: when the last line is turned off, the residual electric quantity in the circuit is released everywhere and is released only in the form of LED luminescence to form ghost. The ghost phenomenon is particularly prominent in the small-distance LED display screen. In addition, the first line in the LED display screen is dark, and the display defects such as high-low gray coupling, cross-board chromatic aberration and the like are caused.
For example, fig. 1 shows a common structure of the LED display driver in the unit panel of the common-anode (the anodes of the 3 kinds of RGB beads are connected together, and the cathodes are separated), in which only beads of one color are shown, and the common-cathode (the cathodes of the 3 kinds of RGB beads are connected together, and the anodes are separated) in the unit panel of the common-cathode LED display screen is to reverse all the LED beads in fig. 1.
The row driver is usually a PMOS transistor, the column driver is usually a constant current source, and usually the constant current source driver chip will include a plurality of constant current output driver channels, and the constant current output channel OUT is connected to the column line in fig. 1, i.e. the 0 th column/the 1 st column ….
The working principle is as follows:
1. firstly, displaying a 1 st row, wherein the PMOS of the 0 th row is conducted, the PMOS of other rows is closed, the row line of the 0 th row is connected with a power supply, and the row lines of other rows are high impedance;
2. the column driving is that the constant current source drives the output constant current sources corresponding to the columns according to the display data of the 0 th row, the LED display lamp beads of the 0 th row are lightened, and the display image of the 0 th row is displayed;
3. and (4) line changing is carried out in sequence, the steps 1-2 are repeated, and all lines are displayed.
To increase the refresh rate, the image of one frame is usually displayed in multiple times, as shown in fig. 2:
1. dividing an image of one frame into n display groups, wherein the display refresh rate is frame rate p, and the refresh rate is increased by p times;
2. each display packet containing a complete display from line 1 to line m;
3. there may be one or more display areas within the display time of each line.
The structure of a channel circuit of a universal LED display screen constant current source driving chip with the pre-charging function is shown in FIG. 3:
fig. 3 is a channel circuit structure in an LED display screen constant current source driving chip, which is a common anode display screen constant current source driving channel circuit structure and a common cathode display screen constant current source driving channel circuit structure, and mainly includes two parts: constant current source output circuit and pre-charge circuit.
Precharge reference potential: a precharge input reference potential of the precharge circuit;
precharge control signal: a signal to control the precharge circuit, comprising one or more control signals;
and (3) displaying data: the input signal of the constant current source output circuit is also display data;
OUT: the output end of the constant current source output channel is connected with the column line of the LED display screen.
A general driving method is shown in fig. 4:
in normal operation, the precharge circuit has 3 operating states:
state 1: including precharge 1 and precharge 3. Pre-charging the output of a column line of the display screen, namely a constant current driving channel of a constant current driving chip, so that all LED lamp beads on the corresponding column line are in a non-luminous cut-off state, and the corresponding display effect is that the lower ghost of the LED display screen can be eliminated;
state 2: and (4) pre-charging 2. The column lines of the display screen, namely the output of the constant current driving channels of the constant current driving chips, are precharged, so that the corresponding column lines are charged to a fixed potential, and all LED lamp beads on the corresponding column lines are in a non-luminous cut-off state, thus the state and environment of each line before display can be the same, and the corresponding display effect is that the first line of the LED display screen can be eliminated, namely the first line of each constant current source driving chip is displayed to be darker;
state 3: an off state. The precharge circuit is off at this time and the output OUT is in a high impedance state.
Since both states 1 and 2 are required to make all LED beads on the column line in the non-lighting off state, states 1 and 2 can be combined into one state, as shown in fig. 5.
However, the use of a constant current source drive with precharge function for display brings about another problem, which is described as follows:
as shown in fig. 6, the constant current output of the constant current chip without the pre-charge circuit only has one constant current path, and then the constant current output power generated by the display data is all used to light the LED lamp bead, so that the light emission of the LED lamp bead is completely controlled by the display data;
as shown in fig. 6, the pre-charge circuit is another newly introduced current path, and this current path will shunt the constant current output power generated by the display data, because of the influence of the parasitic capacitance, the constant current output power shunted by the pre-charge circuit under different display images will be different, resulting in abnormal display, which mainly shows that:
1. high-low gray coupling display is poor;
2. poor display across the panel: the gray scale difference is displayed across the cell plates.
Therefore, how to solve the above technical problems becomes an urgent problem to be solved.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a pre-charging method for an LED display screen, which can improve the display effect of the LED display screen and effectively improve the gray coupling and cross-board chromatic aberration of the LED display screen.
In order to solve the technical problem, the invention discloses a pre-charging method of an LED display screen, which sequentially comprises the following steps of a pre-charging circuit in a single period, namely pre-charging 1, pre-charging 2, circuit closing, pre-charging 3 and pre-charging 4;
the pre-charging circuit is provided with 5 working states which are respectively a state 1, a state 2, a state 3, a state 4 and a state 5, wherein each state of the state 1, the state 2, the state 4 and the state 5 is used for pre-charging the column lines of the display screen respectively, so that the corresponding column lines are charged to a fixed potential which is respectively VR1, VR2, VR3 and VR4, and all LED lamp beads on the corresponding column lines are in a non-luminous cut-off state; state 3 the precharge circuit is off, the output is high impedance state;
when the display data of all display areas in a row line of the display screen is equal to 0, the pre-charging circuit works in a state 1 when the pre-charging is 1, works in a state 4 when the pre-charging is 2, works in a state 5 when the pre-charging is 3, works in a state 3 when the circuit is closed, and works in a state 1 when the pre-charging is 4;
when the display data of all display areas in the row line of the display screen is not equal to 0, the pre-charging circuit works in a state 1 during pre-charging 1, works in a state 2 during pre-charging 2, works in a state 3 during pre-charging 3, works in a state 3 during circuit closing, and works in a state 1 during pre-charging 4.
Further, the fixed potentials VR1, VR2, VR3, and VR4 may be arranged according to the actual display effect by the following method:
when the LED display screen is a common-sun display screen, the minimum value of VR1 is that all lamp beads are normally lighted, and the higher the potential of VR1 is, the better the shadow eliminating effect is; the minimum value of VR2 is that all lamp beads are normally lighted, the darker effect of the first row is better as the potential of VR2 is lower, and the lower gray display brightness is higher; VR3 and VR4 are paired, the minimum value of VR3 and VR4 is that all the lamp beads are normally lighted, and when VR4 is greater than VR3, the larger the value of VR4-VR3 is, the brighter the LED lamp beads are after compensation; when VR4 is greater than VR3 and the larger the value of VR3-VR4 is, the darker the LED lamp bead is after compensation;
when the LED display screen is a common-cathode display screen, the maximum value of VR1 is that all lamp beads are normally lighted, and the lower the potential of VR1 is, the better the shadow eliminating effect is; the maximum value of VR2 is that all lamp beads are normally lighted, the darker effect of the first row is better when the potential of VR2 is higher, and the lower gray display brightness is higher; VR3 and VR4 are paired, the maximum value of VR3 and VR4 is that all the lamp beads are normally lighted, and when VR4 is greater than VR3, the larger the value of VR4-VR3 is, the darker the LED lamp beads are after compensation; when VR4< VR3, the larger the value of VR3-VR4 is, the brighter the LED lamp bead is after compensation.
When the LED display screen is a common-anode display screen, VR3 is greater than VR1, VR3 is greater than VR 4; the LED display screen is a common cathode display screen, VR3< VR1, VR3< VR 4.
Further time of precharge 1 > is 0 display clock cycles, time of precharge 2 >0 display clock cycles, time of precharge 3> 0 display clock cycles, time of precharge 4> 0 display clock cycles;
the interval > from the line feed to the start of precharge 1 is 0 display clock cycles;
the time interval > from the end of precharge 1 to the start of precharge 2 equals 0 display clock cycles, during which the precharge circuit operates in state 3;
the time interval > from the end of precharge 2 to the start of the display area equals 0 display clock cycles, and the precharge circuit operates in state 3 during this interval;
the time interval between the end of the display area and the start of precharge 3 is >0 display clock cycles, during which interval the precharge circuit operates in state 3;
the time interval > from the end of precharge 3 to the start of precharge 4 equals 0 display clock cycles, and the precharge circuit operates in state 3 during this interval.
And further pre-charging for 1-4 time, and taking the minimum value according to the actual display effect on the premise that the actual pre-charging potential reaches the preset value.
The LED display screen adopts the pre-charging method of the LED display screen, and the working state of the pre-charging circuit is adjusted in time sequence, so that the problems of lower ghost and darker first line existing in the LED display screen are solved, and poor high-low gray coupling display and poor cross-board display are effectively improved.
Drawings
FIG. 1 is a common configuration of LED display drivers within a common anode LED display screen unit panel;
FIG. 2 is a schematic diagram of multiple display of a frame of images on an LED display screen;
FIG. 3 is a first channel circuit structure diagram of a common LED display screen constant current source driving chip with a pre-charging function;
FIG. 4 is a timing diagram of a general driving method for an LED display screen;
FIG. 5 is a timing diagram of a general driving method for an LED display screen;
FIG. 6 is a second channel circuit structure diagram of a common LED display screen constant current source driving chip with pre-charge function;
FIG. 7 is a timing chart of a precharging method for an LED display screen according to the present invention;
FIG. 8 is a timing diagram of a second precharging method for an LED display panel according to the present invention.
Detailed Description
The invention will be further described in detail with reference to examples of embodiments shown in the drawings to which, however, the invention is not restricted.
As shown in fig. 7/8, the precharging method of the LED display panel of the present invention includes the following steps of precharging the circuit in a single cycle, precharge 1, precharge 2, circuit off, precharge 3 and precharge 4 in sequence;
the precharge circuit has 5 operating states of state 1, state 2, state 3, state 4 and state 5,
state 1: pre-charging the column lines of the display screen, namely the output of a constant current driving channel of a constant current driving chip, so that the corresponding column lines are charged to a fixed potential VR1, all lamp beads on the corresponding column lines are in a non-luminous cut-off state, and the corresponding display effect is that the lower ghost of the LED display screen can be eliminated;
state 2: the column lines of the display screen, namely the output of the constant current driving channels of the constant current driving chips, are precharged, the corresponding column lines are charged to a fixed potential VR2, and all LED lamp beads on the corresponding column lines are in a non-luminous cut-off state, so that the state and the environment of each line before display are the same, and the corresponding display effect is that the first line of the LED display screen can be eliminated, namely the first line of each constant current source driving chip is dark;
state 3: at this time, the pre-charge circuit is closed, and the output OUT is in a high-impedance state;
and 4: pre-charging the column lines of the display screen, namely the output of a constant current driving channel of the constant current driving chip, so that the corresponding column lines are charged to a fixed potential VR3, and all lamp beads on the corresponding column lines are in a non-luminous cut-off state;
and state 5: the column lines of the display screen, namely the output of the constant current driving channel of the constant current driving chip, are precharged, so that the corresponding column lines are charged to a fixed potential VR4, and all lamp beads on the corresponding column lines are in a non-luminous cut-off state.
As shown in fig. 7, when the display data of all the display areas in the row line of the display screen is equal to 0, that is, the constant current source is not turned on in the display area, the specific operation timing is as follows:
when the voltage is precharged to 1, the precharging circuit works in a state 1, the column line of the display screen, namely the output of the constant current driving channel of the constant current driving chip, is precharged, and the corresponding column line is charged to a fixed potential VR 1;
when in precharging 2, the precharging circuit works in a state 4, the column line of the display screen, namely the output of the constant current driving channel of the constant current driving chip, is precharged, and the corresponding column line is charged to a fixed potential VR 3;
when in precharging 3, the precharging circuit works in a state 5, the column line of the display screen, namely the output of the constant current driving channel of the constant current driving chip, is precharged, and the corresponding column line is charged to a fixed potential VR 4;
when the circuit is closed, the pre-charging circuit works in a state 3, and the circuit is closed.
When in precharging 4, the precharging circuit works in a state 1, the column line of the display screen, namely the output of the constant current driving channel of the constant current driving chip, is precharged, and the corresponding column line is charged to a fixed potential VR 1;
the two working processes of pre-charging 2 and pre-charging 3 at the moment can simulate the starting process of the constant current source on the column line, and the poor high-low gray coupling display and the poor cross-board display are effectively improved.
As shown in fig. 8, when the display data of all the display areas in the row line of the display screen is not equal to 0, that is, the constant current source is turned on in the display area, the specific operation timing is as follows:
when the voltage is precharged to 1, the precharging circuit works in a state 1, the column line of the display screen, namely the output of the constant current driving channel of the constant current driving chip, is precharged, and the corresponding column line is charged to a fixed potential VR 1;
precharge 2 the precharge circuit operates in state 2. Pre-charging the column line of the display screen, namely the output of a constant current driving channel of the constant current driving chip, and charging the corresponding column line to a fixed potential VR 2;
precharge 3 the precharge circuit works in state 3, the circuit is closed.
When the circuit is closed, the pre-charging circuit works in a state 3, and the circuit is closed.
And when the current is precharged 4, the precharging circuit works in the state 1, precharges the column line of the display screen, namely the output of the constant current driving channel of the constant current driving chip, and charges the corresponding column line to a fixed potential VR 1.
The fixed potentials VR1, VR2, VR3 and VR4 can be configured according to actual display effects by the following method:
VR1 corresponds to the working state 1, and the main function of the pre-charge potential is to eliminate the ghost image under the display screen.
For a common-anode display screen, the higher the VR1 potential is, the better the shadow eliminating effect is, and the poor display of directly lighting the lamp beads is caused by too low VR 1;
for a common-cathode display screen, the lower the VR1 potential is, the better the shadow eliminating effect is, and the too high VR1 can cause poor display of directly lighting the lamp beads;
VR2 corresponds to the working state 2, and this pre-charge potential mainly acts to keep the state and environment before displaying the same for each line, can solve the problem that the first line of each constant current driving chip of the LED display screen is dark, and is also used for adjusting low gray color cast.
For a common-sun display screen, the lower the potential of VR2 is, the better the effect of dark first line is, the higher the low-gray display brightness is, and the poor display of directly lighting the lamp beads is caused by too low VR 2;
for a common-cathode display screen, the higher the VR2 potential is, the better the effect of dark first line is, the higher the low-gray display brightness is, and the poor display of directly lighting the lamp beads is caused by the excessively high VR 2;
VR3 and VR4 are paired and respectively correspond to working state 4 and working state 5, and VR3 and VR4 are mainly used for compensating display defects introduced by a shadow elimination circuit, such as high-low gray coupling display defects and cross-board color difference display defects
For a common-sun display screen, VR3 and VR4 are too low to cause poor display of directly lit beads. When VR4> VR3, the larger the value of VR4-VR3 is, the brighter the LED lamp bead is after compensation; when VR4< VR3, the larger the value of VR3-VR4, the darker the LED lamp bead after compensation.
For a common cathode display screen, VR3 and VR4 are too high to cause poor display of directly lit beads. When VR4> VR3, the larger the value of VR4-VR3 is, the darker the LED lamp bead is after compensation; when VR4< VR3, the larger the value of VR3-VR4 is, the brighter the LED lamp bead is after compensation.
Furthermore, in the embodiment, when the LED display screen is a common anode display screen, VR3> VR1, VR3> VR 4; when the LED display screen is a common cathode display screen, VR3< VR1, VR3< VR 4.
Further time of precharge 1 > is 0 display clock cycles, time of precharge 2 >0 display clock cycles, time of precharge 3> 0 display clock cycles, time of precharge 4> 0 display clock cycles;
the interval > from the line feed to the start of precharge 1 is 0 display clock cycles;
the time interval > from the end of precharge 1 to the start of precharge 2 is 0 display clock cycles, and is adjusted according to the actual display effect, and the precharge circuit works in a state 3 at the interval time, namely, a circuit closing state;
the time interval > from the end of the precharge 2 to the start of the display area is 0 display clock period, the adjustment is made according to the actual display effect, and the precharge circuit works in a state 3 at the interval time, namely, a circuit closing state;
the time interval from the end of the display area to the beginning of the pre-charging 3 is more than 0 display clock period, the adjustment is made according to the actual display effect, and the pre-charging circuit works in a state 3 at the interval time, namely, the circuit is in a closed state;
the time interval > from the end of precharge 3 to the start of precharge 4 is 0 display clock cycles, and is adjusted according to the actual display effect, and the precharge circuit operates in state 3, i.e., the circuit off state, at this interval.
And the actual pre-charging potential can not reach the preset value due to too short time for pre-charging for 1-4, and the invalid display time can be too long due to too long time, so that the effective rate of the LED lamp bead lighting time is reduced, and the refresh rate is reduced.
And taking the minimum value according to the actual display effect on the premise that the actual pre-charging potential reaches the preset value within the specific pre-charging time of 1-4. Generally, the display effect is directly observed, the time is gradually increased from small to large, and an optimal time is selected.
In summary, the practical samples which have been prepared according to the present invention as described in the specification and shown in the drawings are tested for a long time, and from the results of the use test, it is needless to say that the expected purpose of the present invention can be achieved and the practical value is no longer questionable. The above-mentioned embodiments are only for convenience of illustration and not intended to limit the invention in any way, and those skilled in the art will be able to make equivalents of the features of the invention without departing from the technical scope of the invention.
Claims (4)
1. A pre-charging method of an LED display screen is characterized in that: the method comprises the following steps of a pre-charging circuit in a single period, namely pre-charging 1, pre-charging 2, circuit closing, pre-charging 3 and pre-charging 4;
the pre-charging circuit is provided with 5 working states which are respectively a state 1, a state 2, a state 3, a state 4 and a state 5, wherein each state of the state 1, the state 2, the state 4 and the state 5 is used for pre-charging the column lines of the display screen respectively, so that the corresponding column lines are charged to a fixed potential which is respectively VR1, VR2, VR3 and VR4, and all LED lamp beads on the corresponding column lines are in a non-luminous cut-off state; state 3 the precharge circuit is off, the output is high impedance state;
when the display data of all display areas in a row line of the display screen is equal to 0, the pre-charging circuit works in a state 1 when the pre-charging is 1, works in a state 4 when the pre-charging is 2, works in a state 5 when the pre-charging is 3, works in a state 3 when the circuit is closed, and works in a state 1 when the pre-charging is 4;
when the display data of all display areas in a row line of the display screen is not equal to 0, the pre-charging circuit works in a state 1 when the pre-charging is 1, works in a state 2 when the pre-charging is 2, works in a state 3 when the pre-charging is 3, works in the state 3 when the pre-charging is 3, and works in the state 1 when the pre-charging is 4;
the fixed potentials VR1, VR2, VR3 and VR4 can be configured according to actual display effect by the following method:
the LED display screen is a common-sun display screen, the minimum value of VR1 is that all lamp beads are normally lighted, and the higher the potential of VR1 is, the better the shadow eliminating effect is; the minimum value of VR2 is that all lamp beads are normally lighted, the darker effect of the first row is better as the potential of VR2 is lower, and the lower gray display brightness is higher; VR3 and VR4 are paired, the minimum value of VR3 and VR4 is that all the lamp beads are normally lighted, and when VR4 is greater than VR3, the larger the value of VR4-VR3 is, the brighter the LED lamp beads are after compensation; when VR4 is greater than VR3 and the larger the value of VR3-VR4 is, the darker the LED lamp bead is after compensation;
the LED display screen is a common-cathode display screen, the maximum value of VR1 is that all lamp beads are normally lighted, and the lower the VR1 potential is, the better the shadow eliminating effect is; the maximum value of VR2 is that all lamp beads are normally lighted, the darker effect of the first row is better when the potential of VR2 is higher, and the lower gray display brightness is higher; VR3 and VR4 are paired, the maximum value of VR3 and VR4 is that all the lamp beads are normally lighted, and when VR4 is greater than VR3, the larger the value of VR4-VR3 is, the darker the LED lamp beads are after compensation; when VR4< VR3, the larger the value of VR3-VR4 is, the brighter the LED lamp bead is after compensation.
2. The pre-charging method for the LED display screen according to claim 1, wherein: when the LED display screen is a common-anode display screen, VR3 is greater than VR1, and VR3 is greater than VR 4; the LED display screen is a common cathode display screen, VR3< VR1, VR3< VR 4.
3. The pre-charging method for the LED display screen according to any one of claims 1 or 2, wherein: the time of precharge 1 > is 0 display clock period, the time of precharge 2 >0 display clock period, the time of precharge 3> 0 display clock period, and the time of precharge 4> 0 display clock period;
the interval > from the line feed to the start of precharge 1 is 0 display clock cycles;
the time interval > from the end of precharge 1 to the start of precharge 2 equals 0 display clock cycles, during which the precharge circuit operates in state 3;
the time interval > from the end of precharge 2 to the start of the display area equals 0 display clock cycles, and the precharge circuit operates in state 3 during this interval;
the time interval between the end of the display area and the start of precharge 3 is >0 display clock cycles, during which interval the precharge circuit operates in state 3;
the time interval > from the end of precharge 3 to the start of precharge 4 equals 0 display clock cycles, and the precharge circuit operates in state 3 during this interval.
4. The pre-charging method for the LED display screen according to claim 3, wherein: and the time of precharging for 1-4 is the minimum value according to the actual display effect on the premise that the actual precharging potential reaches the preset value.
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