CN113554980B - LED driving current modulation method, system and application - Google Patents
LED driving current modulation method, system and application Download PDFInfo
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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
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Abstract
The invention discloses a method, a system and application for modulating LED driving current, and belongs to the technical field of LED driving chip design. Aiming at the problems that the gray scale adjustment method of digital-analog mixing in the prior art cannot continuously improve the gray scale under the condition of keeping the area unchanged, and cannot meet the requirements of richer colors in use and poor low gray scale adjustment performance, the invention provides a method for dividing a display signal into a high bit and a low bit, dividing reference current according to the bit width of the high bit signal, counting the current, and setting clock frequency and counting the current according to the bit width of the low bit signal.
Description
Technical Field
The invention relates to the technical field of LED driving chip design, in particular to an LED driving current modulation method, system and application.
Background
LED shows and has appeared under the scene of difference as a mainstream display mode in daily life, and its low-power consumption, long-life, low-cost characteristics make it receive a good comment in neotype user interaction system, and along with the development of LED industry, people have more pursuits to the display effect of image, and the LED display screen can show comparatively fine and smooth image, and the luminance that can control LED lamp pearl simultaneously reaches better contrast and color. In an LED display system, gray level is an important design index, the definition and contrast of an image are measured by the LED through the setting of the gray level, and the brightness of an LED lamp bead is adjusted and displayed through the gray level, so that a softer display effect is realized.
In the initial LED driving chip design, different operation modes are usually switched by presetting an analog signal to achieve a gray scale adjustment method, so in order to reduce the chip area and the PIN of the chip, the gray scales set in this way have a large difference and a small number, and in practical use, an external signal needs to be adjusted to achieve a function of switching gray scales, so this method is used less. The other method is to control different current levels through digital signals, and the method can set corresponding current values in the chip in advance according to the required gray level, but if the number of the current values set in the chip is too large, the geometric multiple of the chip area is easily increased, and meanwhile, the linearity is poor during display switching, and the display fluctuation caused by the switching is easily and obviously seen.
At present, the gray scale is mainly set in a digital-analog mixing mode, and the higher gray scale is provided under the condition that the chip area is not changed as much as possible through the common control of a digital signal and an analog signal.
Meanwhile, the current design scheme focuses on expanding the maximum gray level, but under the condition of low gray, the situation of low gray level is amplified due to pursuit of the maximum gray level, so that the display effect under the condition of low gray level is poor, the display effect under low brightness cannot be shown, the display effect is poor, and in order to adjust high gray level, the adjustment selection of low gray level is few, and the user experience is influenced.
The applicant previously filed a chinese patent with the title of a driving method and apparatus for a display element, application No. cn202110207792.x, publication No. CN112908244A, published on 2021, 06 months, 04 days, which discloses dividing a bit width into two parts of a high bit width and a low bit width, controlling the two parts in different ways, respectively, solving the problem of chip area, but this scheme cannot satisfy more abundant colors in use, and at the same time, the display effect is poor at low gray scale due to improvement of high gray scale, and the linearity is poor in the actual adjustment process due to the large gray scale interval, and thus the display in reality has a frustration feeling.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems that the gray scale cannot be continuously improved under the condition of keeping the area unchanged by a digital-analog mixed gray scale adjusting method in the prior art, richer colors cannot be used, and the low gray scale adjusting performance is poor, the invention provides an LED driving current modulating method, a system and application, which can realize the purpose of increasing the gray scale under the condition of keeping the chip area unchanged, and can realize the improvement of the low gray scale display effect through a current dividing method, thereby ensuring the better display effect under the low gray scale.
2. Technical scheme
The purpose of the invention is realized by the following technical scheme.
The invention provides a high gray scale mixed LED driving current modulation method for enhancing a low gray display effect, which keeps the bit width of a low-bit digital signal unchanged by increasing the bit width of a high-bit analog signal, thereby achieving the purpose of increasing gray scales under the condition of unchanging the area of a chip; the display effect of the low gray scale is improved by the current division method, and the better display effect under the low gray scale can be ensured.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an LED driving current modulation method generates a reference current and divides a display signal into a high-order signal and a low-order signal; modulating the current division according to the high-order signal and the low-order signal, counting the current division through the low-order signal, and counting the current division through the high-order signal; and after modulation, superposing the sub-currents to obtain the driving current.
According to the invention, through the division of the display signal bit width, the current counting is realized through the low-order signal bit width, the current division and the current counting are realized through the high-order signal bit width, and finally the final driving current is output in a superposition manner, so that the display gray scale is improved under the condition of keeping the area of a chip unchanged, and the display effect is improved.
Preferably, the reference current is divided into branch currents according to the high-order signal bit width, the branch currents are counted by the low-order signals, and the frequency of the clock signal in the display period is determined according to the low-order signal bit width; when the low signal count reaches a threshold, current counting is performed on the high signal. The scheme of the invention divides the display signal, divides the reference current, counts in the display period according to the low-order signal, and counts the times in the high-order signal for the carry operation of which the count exceeds the threshold value. According to the invention, after the display signal and the driving current are divided, the display gray scale is greatly improved, the frequency of the clock signal is reduced, the area of a chip is not increased, and the user experience is objectively improved.
Preferably, the reference current is divided into 2 according to the high-order signal bit width mmAnd (4) dividing the current. m is a natural number, the current is divided into a plurality of branch currents, which is equivalent to distributing the control signals to the branch currents, so that a longer display signal is prevented from being divided into a plurality of small signals to be driven when the color is rich, and a better display effect can be obtained under the condition of ensuring that the area of a chip is unchanged.
Preferably, setting one display period to include 2 according to the bit width n of the low-order signalnA clock signal. n is a natural number, and the clock frequency in the display period is determined by the bit width of the low-order signal after signal division, so that the clock frequency is reduced to a certain extent. The scheme of the invention reduces the clock frequency and obtains better display gray scale.
Preferably, the high-order signal keeps the current output times during current counting, and another high-order signal channel is opened for the next low-order signal to count. The high-order signal realizes the counting operation according to the counting result of the low-order signal, the output of the high-order signal is fixed, and only when the counting of the low-order signal reaches the maximum value, the high-order signal outputs a maximum value of the low-order bit width, thereby realizing the configuration of high weight. After the high-order signal records the maximum of the low-order signal, the next low-order signal is counted by the other high-order signal, so that the phenomenon that the high-order conversion causes large jump is avoided.
Preferably, the low-order signal is controlled by a digital signal and the high-order signal is controlled by an analog signal.
Preferably, the high-order signal bit width is smaller than the low-order signal bit width. The high-order signal is controlled by the analog signal, the area of a chip is increased due to the fact that the bit width of the high-order signal is too high, the bit width of the high-order signal is set to be smaller than that of the low-order signal when the bit width of the display signal is divided, the area of the chip is convenient to reduce, and control precision is improved.
Preferably, the reference current is generated by a constant current source. The invention only needs to use one reference current, namely the standard value I of the driving current0The rest of the current is divided and given according to the bit width. The invention reduces the use of current sources, reduces the complexity of a chip and also improves the display effect.
The invention splits the reference current by a bit width splitting method, matches the current with different grades according to the high-low bit signals, thereby realizing smoother gray level change, ensuring that the adjustment grade of the low gray level can be adjusted, and further expanding the original high gray level by the bit width splitting method.
The system comprises a bit width dividing unit, a current modulation unit A, a current modulation unit B and a driving current generation unit, wherein the bit width dividing unit is used for dividing a display signal, the current modulation unit A is used for dividing a reference current into a divided current and a current meter, the current modulation unit B is used for determining the clock signal frequency and the current meter number of a display period, and the driving current generation unit is used for superposing the modulated divided currents to generate a driving current.
An LED chip comprises the LED driving current modulation system, the chip further comprises an LED display array and a current source, the current source generates reference current and then modulates the reference current through the LED driving current modulation system, and the modulated current is used for driving the LED display array.
The invention provides an LED chip, which adopts a high gray scale mixed modulation method for enhancing the low gray display effect, realizes higher gray scale setting by splitting a gray scale signal into a high bit and a low bit, can achieve the purpose of enhancing the display effect under the condition of low gray because of splitting current, and is provided with a conduction switching method to avoid the generation of jumping so as to improve the integral linearity of the gray scale.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the invention provides a modulation method and a modulation system of LED driving current, which are used for enhancing the low-gray display effect by mixing high gray scales. Splitting the bit width of the display signals, splitting the display signals with high bit number in rich display colors into display signals with high bit width and display signals with low bit width, expanding the bit width, and realizing larger gray scale setting in display;
(2) the invention has simple structure and easy realization, refines the grade under the condition of low gray level by dividing the current, reduces the clock frequency and can realize higher gray level at the same time, realizes the improvement of low gray level display effect under the condition of not additionally increasing the circuit structure and increases the options of low gray level;
(3) the invention adopts a switching design method in the circuit, reduces the display current jump caused by digit switching, and enhances the whole gray scale linearity by a current superposition method;
(4) the invention reduces the frequency of the clock signal, also obviously improves the high gray scale during display, enhances the effect of low gray scale display, improves the linearization of the whole gray scale, can improve the effect of adjusting the gray scale under the condition of not greatly increasing the area of a chip, and objectively improves the user experience.
Drawings
FIG. 1 is a schematic diagram of a driving current modulation method according to the present invention;
FIG. 2 is a timing diagram of driving current modulation according to the present invention;
FIG. 3 is a timing diagram of driving current modulation according to an embodiment of the present invention;
FIG. 4 is a timing diagram of driving current modulation according to another embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples.
Example 1
The embodiment discloses a method for modulating an LED driving current, as shown in FIG. 1, a reference current is set first, a display signal bit width is divided into a high order and a low order, the reference current is divided by a high order analog signal, the conduction time of the divided current is controlled by a low order digital signal and a corresponding clock, a carry signal is stored in the high order analog signal, and finally the high order analog signal and the low order digital signal are synthesized, so that the purpose of increasing gray scales under the condition that the chip area is not changed is achieved, the display effect of the low gray scales is improved by a current dividing method, and a better display effect under the low gray scales can be ensured.
The current modulation method specifically comprises the following steps:
step 1: the total bit width of the display signal is divided into two parts, i.e., a high bit and a low bit.
As shown in fig. 1, before the driving current modulation is performed, the total bit width D of the display signal is divided, the total bit width is divided into a high bit and a low bit, the high bit display signal includes M bits, the low bit display signal includes n bits, M and n are natural numbers, and the divided high bit display signal and low bit display signal are M [ M-1; 0] and N [ N-1; 0].
In order to realize a control chip with smaller area, the high-order display signal is controlled by an analog signal and is matched with the current count determined by the low-order display signal; the low-order display signal is controlled by a digital signal and combines with a clock signal to control the current. The bit number m of the high-order bit width is smaller than the bit number n of the low-order bit width, namely m is smaller than n, at the moment, under the condition of improving the precision of the low gray scale, the high gray scale can be effectively increased, because the bit width of the low-order display signal represents the low-weight current level, the bit width of the low-order display signal is larger than the bit width of the high-order display signal, and the system can realize smoother linear change.
Step 2: setting a reference current I0Current division into 2 by high order signal bit widthm Setting clock frequency 2 according to low-order signal bit widthnAnd controlling the current conduction time according to the digital signal for controlling the low-order signal.
In the scheme, only one reference current I is set0And the rest currents are divided and set according to the bit width, so that the use of current sources is reduced, the complexity of a chip is reduced, and the display effect of the display element is improved.
The number m of high-order display signals is the reference current I0Is divided into corresponding 2mAnd the current division is used for current division to provide subsequent unit currents, and the adjustment step under the low gray condition can be smaller through the current division, so that the low gray display enhancement is realized, and the display precision under the low gray level condition is improved. The divided currents are used for subsequent current counting of high bits and current counting of low bits.
The low-order display signal controls the corresponding current conduction time through a digital signal, and the digit n of the low-order display signal determines that one display period comprises 2nThe clock pulse of (2) controls the conduction of the corresponding vanishing time through the digital signal. Because the clock cycle frequency of the display cycle is determined according to the low-order digit n, the clock frequency is reduced to a certain extent by dividing the display signal bit width, and a better display effect and a larger gray scale level can be achieved. When the low-order signal is controlled from the 0 th order according to the digital signal until the (n-1) th order is output, namely the low-order control signal is full, the high-order signal is carried.
Referring to fig. 2, when the low control signal is outputted with a full width, the high control signal needs to be carried, and the high control signal controls the full period output. Meanwhile, after the high-level control signal is output, the next low-level control signal is output by the next high-level control signal, so that signal jump caused when the low-level control signal is fully output and reset to zero output is avoided. After the high-order control signal is output, the corresponding channel is locked, and the next channel is opened for the low-order continuous counting.
And step 3: superposing all the partial currents to obtain a driving current IOFor driving the display of the LEDs.
When the LED display signal is output, the sub-currents modulated according to the high-order signal and the low-order signal are superposed to obtain a driving current IOFor driving the display of the LEDs. Wherein, carry outThe high-order signal current of the current meter is marked as IMAnd the low-order signal current for current counting is recorded as IN，IO=IM+IN。
As shown in the waveform diagram of FIG. 2, the signal with total bit width D is divided into high bits M [ M-1: 0]]And low bit width N [ N-1: 0]]D = M + N, dividing the reference current into 2 according to the high-order digit MmAnd the low-order signals are controlled under the corresponding high-order signals, and when the low-order signals are fully output, the corresponding high-order signals are fixed. Fig. 2 is a waveform diagram of a display signal control signal divided according to the high-order bit number m. Division of reference current into 2mIn response to control signals from M0Start to M2 m-1A 1, MxNumber of bits controlled by low-order signals, M0And M1The remaining bits are not enabled for the high case after the full low signal output.
The invention stores the carry signal in the analog signal of high-order control, and synthesizes the high-order analog signal and the low-order digital signal, thereby realizing the modulation of the LED chip in the high gray scale mixing for enhancing the low gray display effect.
For a more convenient understanding of the method of the present invention, FIG. 3 is a waveform diagram of an embodiment of the present invention. In the example shown in fig. 3, the bit width of the signal is 5 bits, the signal is divided, since the low-order bit number needs to be greater than the high-order bit number, that is, the signal is divided into high-order 2 bits and low-order 3 bits, and the reference current I is set by the current source0。
According to the modulation method, 2 is divided according to the high-order signal bit width 22=4 channels, and applies a reference current I01/4, dividing the current into original currents, and controlling the divided currents by the signals of each channel after division; is controlled to be 2 according to the bit width 3 of the low-order signal3Current output in =8 clock cycles, i.e. 8 clock cycles correspond to one display cycle.
As shown in FIG. 3, the input image level is 4 (i.e. signal 00100), the high-order signal is 0 (00), the low-order signal is 4 (100), and only the low-order signal M is present0The current values of 4 pulse widths are output according to the clock signal CLK, and other high-order signals do not operate.
FIG. 4 is a waveform diagram of another embodiment of the present invention, and FIG. 4 shows the same bit width as that of the signal of FIG. 3, and also splits the signal into high-order 2 bits and low-order 3 bits, as described above, the control signal is split into 2 bits according to the high-order 2 bits2=4 channels, reference current I01/4 divided into primary current, controlled at 2 according to low level3Current output in =8 clock cycles, 8 clock cycles corresponding to one display cycle.
As shown in fig. 4, the input image elimination level is 18 (i.e. the signal is 10010), the high-order signal is 2 (10), the low-order signal is 2 (010), and the high-order signal outputs current values of 2 pulse widths according to the clock signal CLK, and the low-order signal M0And M1Each outputting 2 full-period pulse widths.
The invention divides the display signal into a high-order signal and a low-order signal, keeps the digital bit width of the low-order display signal unchanged by increasing the analog bit width of the high-order display signal, achieves the purpose of increasing the gray scale under the condition of unchanged chip area, realizes the improvement of the display effect of the low gray scale by a current division method, and can ensure better display effect under the low gray scale.
Example 2
The embodiment discloses an LED driving current modulation system, which comprises a bit width dividing unit, a current modulation unit A, a current modulation unit B and a driving current generating unit, wherein the bit width dividing unit is used for dividing the display signal bit width into a high-order signal bit width and a low-order signal bit width, and the current modulation unit A is used for dividing reference current into branch current and realizing current counting; the current modulation unit B is used for determining the clock signal frequency of a display period and realizing current counting; the driving current generating unit superposes the modulated currents to generate driving current for driving the LED to display.
The driving current modulation system realizes higher gray scale setting by splitting the display signal into a high level and a low level, and simultaneously, the display effect under the condition of low gray is enhanced by splitting the current, and the jump is avoided by setting the conduction switching method, so that the integral linearity of the gray scale is improved, and the user experience is objectively improved.
The invention and its embodiments have been described schematically and without limitation, and according to the invention, as described in the specification and drawings, the production of a real sample wafer is completed and the chip architecture is tested through multiple use tests, without any doubt, and the actual performance and efficacy are verified through multiple test tests. The above embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, and all equivalent examples modified or modified by the present invention are included in the scope of the present invention.
Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (9)
1. An LED driving current modulation method is characterized in that reference current is generated, and a display signal is divided into a high-order signal and a low-order signal; modulating the current division according to the high-order signal and the low-order signal, counting the current division through the low-order signal, and counting the current division through the high-order signal; after modulation, superposing the sub-currents to obtain a driving current;
dividing the reference current into branch currents according to the bit width of the high-order signal, counting the branch currents through the low-order signal, and determining the frequency of a clock signal in a display period according to the bit width of the low-order signal; when the low signal count reaches a threshold, current counting is performed on the high signal.
2. The method of claim 1, wherein the modulation of the driving current of the LED is based on the high bit rateThe number bit width m divides the reference current into 2mAnd (4) dividing the current.
3. The method as claimed in claim 1, wherein setting a display period according to the bit width n of the low-order signal comprises 2nA clock signal.
4. The method as claimed in claim 1, wherein the high-order signal is kept for the current output times during current counting, and another high-order signal channel is opened for the next low-order signal to count.
5. The method as claimed in claim 2 or 3, wherein the low-order signal is controlled by a digital signal and the high-order signal is controlled by an analog signal.
6. The LED driving current modulation method according to claim 5, wherein the high-order signal bit width is smaller than the low-order signal bit width.
7. The method according to claim 1, wherein the reference current is generated by a constant current source.
8. An LED driving current modulation system using an LED driving current modulation method according to any one of claims 1 to 7, the system comprising a bit width dividing unit for dividing a display signal, a current modulation unit a for dividing a reference current into a divided current and a current count, a current modulation unit B for determining a clock signal frequency and a current count of a display period, and a driving current generation unit for superimposing the modulated divided currents to generate a driving current.
9. An LED chip comprising the LED driving current modulation system according to claim 8, wherein the chip further comprises an LED display array and a current source, the current source generates a reference current and modulates the reference current by the LED driving current modulation system, and the modulated current is used for driving the LED display array.
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| JP4123037B2 (en) * | 2002-04-24 | 2008-07-23 | セイコーエプソン株式会社 | Electro-optical device, driving method thereof, and electronic apparatus |
| JP4346350B2 (en) * | 2003-05-28 | 2009-10-21 | 三菱電機株式会社 | Display device |
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