CN114078460A - Unequal difference pulse width modulation dimming method - Google Patents
Unequal difference pulse width modulation dimming method Download PDFInfo
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- CN114078460A CN114078460A CN202010946043.4A CN202010946043A CN114078460A CN 114078460 A CN114078460 A CN 114078460A CN 202010946043 A CN202010946043 A CN 202010946043A CN 114078460 A CN114078460 A CN 114078460A
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
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Abstract
The invention discloses an unequal-difference pulse width modulation dimming method which is applied between a transmitting end and a receiving end. The pulse width modulation dimming method comprises the following steps: when the transmitting end respectively receives a plurality of lights with different brightness ratios, the transmitting end corresponds to respectively send out pulse width modulation signals with different high-low potential ratios; when the receiving end receives the pulse width modulation signals with different high-low potential ratios, the receiving end corresponds again so as to correspondingly emit the lights with different brightness ratios; the corresponding relationship between the different high-low potential ratios and the different brightness ratios is represented as a broken line.
Description
Technical Field
The present invention relates to Pulse-width modulation (PWM) technology, and more particularly, to a non-uniform Pulse width modulation (Unequal difference) dimming method.
Background
In the prior art, an Equal difference (Equal difference) pwm dimming method is usually used between a Transmitter (TX) and a Receiver (RX).
For example, as shown in fig. 1A, when the transmitting terminal TX receives the first light L1 with a luminance ratio of 75%, the second light L2 with a luminance ratio of 25%, and the third light L3 with a luminance ratio of 50%, the transmitting terminal TX correspondingly sends a first PWM signal PWM1 with a high-low potential ratio of 75%, a second PWM signal PWM2 with a high-low potential ratio of 25%, and a third PWM signal PWM3 with a high-low potential ratio of 50% to the receiving terminal RX, and then the receiving terminal RX correspondingly sends a first light L1 with a luminance ratio of 75%, a second light L2 with a luminance ratio of 25%, and a third light L3 with a luminance ratio of 50%, where the correspondence between the high-low potential ratios of the PWM signals and the luminance ratios of the lights is a linear Equal difference (Equal difference) correspondence, as shown in fig. 1B.
However, since the noise of the system (e.g., the oscillator jitter (OSC jitter) of the TX/RX) varies at each level, the linear equation between the high-to-low ratio of the pwm signals and the luminance ratio of the light is likely to limit the maximum resolution of the system to the maximum noise level, and thus needs to be improved.
Disclosure of Invention
Accordingly, the present invention provides an unequal-difference pwm dimming method to effectively solve the above-mentioned problems encountered in the prior art.
An embodiment according to the present invention is an unequal-difference pwm dimming method. In this embodiment, the unequal-difference pwm dimming method is applied between the transmitting end and the receiving end and includes the following steps: when the transmitting end respectively receives a plurality of lights with different brightness ratios, the transmitting end carries out Mapping so as to respectively send out pulse width modulation signals with different high-low potential ratios; when the receiving end respectively receives the pulse width modulation signals with different high-low potential ratios, the receiving end carries out re-mapping (mapping) so as to respectively correspondingly emit the lights with different brightness ratios; the corresponding relationship between the different high-low potential ratios and the different brightness ratios is represented as a broken line.
In one embodiment, the broken line includes at least a first line segment and a second line segment, and the first line segment and the second line segment intersect each other and have different slopes respectively.
In one embodiment, the first line segment and the second line segment intersect with each other at a first intersection point, and the first intersection point corresponds to a first high-low potential ratio and a first brightness ratio.
In an embodiment, a ratio of the first high-low potential ratio to the first luminance ratio is smaller than 1, and a first slope of the first line segment is smaller than a second slope of the second line segment.
In an embodiment, a ratio of the first high-low potential ratio to the first luminance ratio is greater than 1, and a first slope of the first line segment is greater than a second slope of the second line segment.
In one embodiment, the transmitting end is corresponding according to the corresponding relationship between the different high-low potential ratios and the different brightness ratios.
In one embodiment, the receiving end performs the re-correspondence according to the correspondence between the different high-low potential ratios and the different brightness ratios.
In one embodiment, the transmitter includes at least one Mapping parameter (Mapping parameter) required for Mapping.
In one embodiment, the receiving end includes at least one Remapping parameter (Remapping parameter) required for the Remapping.
In one embodiment, the broken line includes a first line segment, a second line segment and a third line segment, each having a different slope, the first line segment and the second line segment intersect with each other, and the second line segment and the third line segment intersect with each other.
In one embodiment, the first line segment and the second line segment intersect with each other at a first intersection point and the second line segment and the third line segment intersect with each other at a second intersection point, the first intersection point corresponds to the first high-low potential ratio and the first luminance ratio and the second intersection point corresponds to the second high-low potential ratio and the second luminance ratio.
In an embodiment, a ratio of the first high-low potential ratio to the first luminance ratio is less than 1, and a ratio of the second high-low potential ratio to the second luminance ratio is less than 1, and then the first slope of the first line segment is less than the second slope of the second line segment and the second slope of the second line segment is less than the third slope of the third line segment.
In an embodiment, a ratio of the first high-low potential ratio to the first luminance ratio is greater than 1, and a ratio of the second high-low potential ratio to the second luminance ratio is greater than 1, then the first slope of the first line segment is greater than the second slope of the second line segment, and the second slope of the second line segment is greater than the third slope of the third line segment.
Compared with the prior art, in the Unequal-difference pwm dimming method of the present invention, the transmitting end/receiving end respectively performs Mapping/re-Mapping (Remapping) according to the polygonal Unequal difference (inequality difference) correspondence between the high-low potential ratio of the pwm signals and the brightness ratio of the lights, so that the resolutions of the brightnesses of each step are similar, thereby increasing the resolution at the maximum noise level and further increasing the maximum resolution of the system, and thus effectively solving the problem in the prior art that the resolution is limited by the maximum noise level.
The advantages and spirit of the present invention can be further understood by the following detailed description of the invention and the accompanying drawings.
Drawings
Fig. 1A is a schematic diagram illustrating an equal-difference pwm dimming method applied between a transmitting end and a receiving end in the prior art.
Fig. 1B is a schematic diagram of a linear Equal difference (Equal difference) correspondence relationship between the high-to-low potential ratios of the pwm signals and the luminance ratios of the lights in fig. 1A.
Fig. 2 is a flow chart of an unequal-difference pwm dimming method according to a preferred embodiment of the invention.
Fig. 3A is a diagram illustrating an embodiment of an unequal-difference pwm dimming method applied between a transmitting end and a receiving end according to the present invention.
Fig. 3B is a schematic diagram of the non-uniform difference corresponding relationship between the high-low potential ratio of the pwm signals and the brightness ratio of the lights in fig. 3A.
Fig. 4A is a diagram illustrating another embodiment of an unequal-difference pwm dimming method applied between a transmitting end and a receiving end according to the present invention.
Fig. 4B is a schematic diagram of the non-uniform difference corresponding relationship between the high-low potential ratio of the pwm signals and the brightness ratio of the lights in fig. 4A.
Fig. 5 is a schematic diagram illustrating that a transmitting end and a receiving end respectively include corresponding parameters and re-corresponding parameters according to the present invention.
Description of the main element symbols:
S10-S16
TX transmitting terminal
RX receiving end
L1 first light
L2 second light
L3 third light
PWM1 first pulse width modulation signal
PWM2 second pulse width modulation signal
PWM3 third pulse width modulation signal
PL1 first fold line
PL2 second fold line
SG1 first line section
SG2 second segment
SG3 third segment
N1 first intersection
Second intersection of N2
Corresponding parameters of MP
RMP remap parameter
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. The same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.
An embodiment according to the present invention is an unequal-difference pwm dimming method. In this embodiment, the unequal-difference pwm dimming method can be applied to a display device and can be applied to signal transmission between a transmitting end and a receiving end, but not limited thereto.
Referring to fig. 2, fig. 2 is a flowchart of the unequal-difference pwm dimming method in this embodiment.
As shown in fig. 2, the unequal-difference pwm dimming method in this embodiment may include the following steps:
step S10: the transmitting end respectively receives a plurality of lights with different brightness ratios;
step S12: the transmitting end carries out Mapping (Mapping) to respectively send out pulse width modulation signals with different high-low potential ratios;
step S14: the receiving end respectively receives the pulse width modulation signals with different high-low potential ratios; and
step S16: the receiving end performs re-mapping (Remapping) to correspondingly emit the lights with different brightness ratios respectively.
It should be noted that, there is a correspondence relationship between the high-low potential ratio of the pwm signals and the luminance ratio of the lights, for example, a graph of the correspondence relationship between the two is shown as a broken line (Polyline), but not limited thereto.
Therefore, in practical applications, the transmitting end can correspond to the light signals according to the correspondence of the unequal differences between the high-low potential ratios of the pulse width modulation signals and the brightness ratios of the light signals, and correspondingly outputs the pulse width modulation signals with different high-low potential ratios according to the received light signals with different brightness ratios; similarly, the receiving end can perform the correspondence according to the correspondence of the unequal difference between the high-low potential ratio of the pulse width modulation signals and the brightness ratio of the lights, so as to correspondingly output the lights with different brightness ratios according to the pulse width modulation signals with different high-low potential ratios.
Next, please refer to fig. 3A and fig. 3B. Fig. 3A is a diagram illustrating an embodiment of an unequal-difference pwm dimming method applied between a transmitting end and a receiving end according to the present invention. Fig. 3B is a schematic diagram of the correspondence relationship between the high-low potential ratios of the pwm signals and the luminance ratios of the lights in fig. 3A, wherein the correspondence relationship has a polygonal Unequal difference (inequal difference).
As shown in fig. 3A, when the transmitting end TX receives the first light L1 with a luminance ratio of 75%, the second light L2 with a luminance ratio of 25%, and the third light L3 with a luminance ratio of 50% (i.e., step S10 in fig. 2), the transmitting end TX performs Mapping (Mapping) according to the zigzag unequal difference correspondence shown in fig. 3B to correspondingly emit the first PWM signal PWM1 with a high-low potential ratio of 50%, the second PWM signal PWM2 with a high-low potential ratio of 12.5%, and the third PWM signal PWM3 with a high-low potential ratio of 25% (i.e., step S12 in fig. 2).
When the receiving terminal RX receives the first PWM signal PWM1 with the high-low potential ratio of 75%, the second PWM signal PWM2 with the high-low potential ratio of 25%, and the third PWM signal PWM3 with the high-low potential ratio of 50% (i.e., step S14 in fig. 2), the receiving terminal RX performs re-mapping (Remapping) according to the fold-line-shaped unequal difference correspondence relationship shown in fig. 3B, so as to correspondingly emit the first light L1 with the brightness ratio of 75%, the second light L2 with the brightness ratio of 25%, and the third light L3 with the brightness ratio of 50% (i.e., step S16 in fig. 2).
As shown in fig. 3B, in this embodiment, the corresponding relationship curve between the high-low potential ratio of the PWM signals PWM 1-PWM 3 and the luminance ratio of the lights L1-L3 is represented as a first broken line PL1, and the first broken line PL1 includes a first line segment SG1 and a second line segment SG2, and the first line segment SG1 and the second line segment SG2 intersect each other and respectively have different slopes.
In detail, the first line segment SG1 and the second line segment SG2 intersect with each other at a first intersection point N1, and the first intersection point N1 corresponds to a first high-low potential ratio (i.e., 50%) and a first luminance ratio (i.e., 75%). From fig. 3B, it can also be seen that: the ratio (i.e., 0.67) of the first high-low potential ratio (i.e., 50%) to the first brightness ratio (i.e., 75%) in this embodiment is less than 1, and thus the first slope of the first line SG1 is less than the second slope of the second line SG 2.
In another embodiment, if the ratio of the first high-low potential ratio corresponding to the first intersection N1 to the first luminance ratio is greater than 1, the first slope of the first line segment SG1 is greater than the second slope of the second line segment SG2, but not limited thereto.
Next, please refer to fig. 4A and fig. 4B. Fig. 4A is a diagram illustrating another embodiment of an unequal-difference pwm dimming method applied between a transmitting end and a receiving end according to the present invention. Fig. 4B is a schematic diagram of the non-uniform difference corresponding relationship between the high-low potential ratio of the pwm signals and the brightness ratio of the lights in fig. 4A.
As shown in fig. 4A, when the transmitting end TX receives the first light L1 with a luminance ratio of 75%, the second light L2 with a luminance ratio of 25%, and the third light L3 with a luminance ratio of 50% (i.e., step S10 in fig. 2), the transmitting end TX performs Mapping (Mapping) according to the zigzag unequal difference correspondence shown in fig. 4B to correspondingly emit the first PWM signal PWM1 with a high-low potential ratio of 62.5%, the second PWM signal PWM2 with a high-low potential ratio of 12.5%, and the third PWM signal PWM3 with a high-low potential ratio of 37.5% (i.e., step S12 in fig. 2).
When the receiving end RX receives the first PWM signal PWM1 with the high-low potential ratio of 62.5%, the second PWM signal PWM2 with the high-low potential ratio of 12.5%, and the third PWM signal PWM3 with the high-low potential ratio of 37.5% (i.e., step S14 in fig. 2), the receiving end RX performs re-mapping (Remapping) according to the zigzag unequal difference correspondence shown in fig. 4B, so as to correspondingly emit the first light L1 with the brightness ratio of 75%, the second light L2 with the brightness ratio of 25%, and the third light L3 with the brightness ratio of 50% (i.e., step S16 in fig. 2).
As shown in fig. 4B, in this embodiment, the corresponding relationship curve between the high-low potential ratio of the PWM signals PWM 1-PWM 3 and the luminance ratio of the lights L1-L3 is represented as a second broken line PL2, and the second broken line PL2 includes a first line segment SG1, a second line segment SG2 and a third line segment SG3, and the first line segment SG1, the second line segment SG2 and the third line segment SG3 have different slopes respectively, the first line segment SG1 and the second line segment SG2 intersect each other, and the second line segment SG2 and the third line segment SG3 intersect each other.
In detail, the first line segment SG1 and the second line segment SG2 intersect with each other at a first intersection point N1 and the second line segment SG2 and the third line segment SG3 intersect with each other at a second intersection point N2, the first intersection point N1 corresponds to a first high-low potential ratio (i.e., 12.5%) and a first luminance ratio (i.e., 25%) and the second intersection point N2 corresponds to a second high-low potential ratio (i.e., 62.5%) and a second luminance ratio (i.e., 75%).
From fig. 4B, it can also be seen that: in this embodiment, the ratio (i.e., 0.5) of the first high-low potential ratio (i.e., 12.5%) to the first luminance ratio (i.e., 25%) is less than 1 and the ratio (i.e., 0.83) of the second high-low potential ratio (i.e., 62.5%) to the second luminance ratio (i.e., 75%) is also less than 1, so that the first slope of the first segment SG1 is less than the second slope of the second segment SG2 and the second slope of the second segment SG2 is less than the third slope of the third segment SG 3.
In another embodiment, if the ratio of the first high-low potential ratio corresponding to the first intersection N1 to the first brightness ratio is greater than 1 and the ratio of the second high-low potential ratio corresponding to the second intersection N2 to the second brightness ratio is greater than 1, the first slope of the first line segment SG1 is greater than the second slope of the second line segment SG2 and the second slope of the second line segment SG2 is greater than the third slope of the third line segment SG3, but not limited thereto.
In practical applications, as shown in fig. 5, the transmitting end TX of the present invention may include at least one Mapping Parameter (MP) required for Mapping; the receiving end RX may include at least one Remapping parameter (RMP) required for performing the Remapping, for use when performing the Remapping, but not limited thereto.
Compared with the prior art, in the Unequal-difference pwm dimming method of the present invention, the transmitting end/receiving end respectively performs Mapping/re-Mapping (Remapping) according to the Unequal difference (un difference) correspondence between the high-low potential ratio of the pwm signals and the brightness ratio of the lights, so that the resolutions of each order of brightness are similar, thereby improving the resolution at the maximum noise position and further improving the maximum resolution of the system, and thus effectively solving the problem in the prior art that the resolution is limited by the maximum noise position.
Claims (13)
1. An unequal-difference pulse width modulation dimming method is applied between a transmitting end and a receiving end, and is characterized by comprising the following steps of:
when the transmitting end respectively receives a plurality of lights with different brightness ratios, the transmitting end carries out a correspondence so as to respectively send out pulse width modulation signals with different high-low potential ratios; and
when the receiving end receives the pulse width modulation signals with different high-low potential ratios respectively, the receiving end performs a re-correspondence so as to correspondingly emit the lights with different brightness ratios respectively;
wherein, a corresponding relationship between the different high-low potential ratios and the different brightness ratios is represented as a broken line.
2. The pwm dimming method according to claim 1, wherein the polygonal line comprises a first line segment and a second line segment, the first line segment and the second line segment intersect each other and have different slopes respectively.
3. The pwm dimming method of claim 2, wherein the first line segment and the second line segment intersect each other at a first intersection point, and the first intersection point corresponds to a first high-low potential ratio and a first brightness ratio.
4. The PWM dimming method according to claim 3, wherein a ratio of the first high-low potential ratio to the first brightness ratio is smaller than 1, and a first slope of the first line segment is smaller than a second slope of the second line segment.
5. The PWM dimming method according to claim 3, wherein a ratio of the first high-low potential ratio to the first brightness ratio is greater than 1, and a first slope of the first line segment is greater than a second slope of the second line segment.
6. The PWM dimming method according to claim 1, wherein the transmitter performs the mapping according to the mapping between the different high-to-low potential ratios and the different brightness ratios.
7. The PWM dimming method according to claim 1, wherein the receiver performs the re-mapping according to the mapping relationship between the different high-to-low potential ratios and the different brightness ratios.
8. The method as claimed in claim 1, wherein the transmitter comprises at least one correspondence parameter required for the correspondence.
9. The method as claimed in claim 1, wherein the receiver comprises at least one re-mapping parameter required for the re-mapping.
10. The pwm dimming method of claim 1, wherein the polygonal line comprises a first line segment, a second line segment and a third line segment, each having different slopes, the first line segment and the second line segment intersecting each other and the second line segment and the third line segment intersecting each other.
11. The pwm dimming method according to claim 10, wherein the first line segment and the second line segment intersect with each other at a first intersection point and the second line segment and the third line segment intersect with each other at a second intersection point, the first intersection point corresponding to a first high-low potential ratio and a first brightness ratio and the second intersection point corresponding to a second high-low potential ratio and a second brightness ratio.
12. The pwm dimming method according to claim 11, wherein a ratio of the first high-low potential ratio to the first brightness ratio is less than 1 and a ratio of the second high-low potential ratio to the second brightness ratio is less than 1, and then a first slope of the first line segment is less than a second slope of the second line segment and the second slope of the second line segment is less than a third slope of the third line segment.
13. The pwm dimming method according to claim 11, wherein a ratio of the first high-low potential ratio to the first brightness ratio is greater than 1 and a ratio of the second high-low potential ratio to the second brightness ratio is greater than 1, and then a first slope of the first line segment is greater than a second slope of the second line segment and the second slope of the second line segment is greater than a third slope of the third line segment.
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| TW109128435 | 2020-08-20 | ||
| TW109128435A TWI745038B (en) | 2020-08-20 | 2020-08-20 | Pulse-width modulation dimming method with unequal difference |
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Also Published As
| Publication number | Publication date |
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| TW202209292A (en) | 2022-03-01 |
| TWI745038B (en) | 2021-11-01 |
| CN114078460B (en) | 2023-07-04 |
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