CN118135945B - Grayscale modulation method of single-end injection type light-emitting device - Google Patents
Grayscale modulation method of single-end injection type light-emitting deviceInfo
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- CN118135945B CN118135945B CN202410506877.1A CN202410506877A CN118135945B CN 118135945 B CN118135945 B CN 118135945B CN 202410506877 A CN202410506877 A CN 202410506877A CN 118135945 B CN118135945 B CN 118135945B
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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
- G09G2230/00—Details of flat display driving waveforms
-
- 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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
本发明提供一种单端注入型发光器件的灰度调制方法，考虑单端注入型发光器件只在正半周期发光，为了提升显示亮度，根据幅度与亮度的关系，将单个驱动周期平均分为N个子帧，再根据幅度与亮度的关系，选取M个基准电压，每个基准电压对应一个基准灰阶；根据相对占空比与亮度的关系，进行相对占空比的灰度调控。通过幅度、频率、相对占空比混合式调制的方法，可实现单端注入型发光器件灰度等级的精准调制。本发明中单端注入型发光器件属于单端电学耦接，采用感生电场驱动发光，可以简化显示器件的线路连接，可避免巨量转移工艺以及复杂的键合工艺。
The present invention provides a grayscale modulation method for a single-ended injection-type light-emitting device. Considering that the single-ended injection-type light-emitting device emits light only in the positive half-cycle, in order to improve the display brightness, a single driving cycle is evenly divided into N subframes according to the relationship between amplitude and brightness. Then, according to the relationship between amplitude and brightness, M reference voltages are selected, and each reference voltage corresponds to a reference grayscale. According to the relationship between relative duty cycle and brightness, grayscale regulation of the relative duty cycle is performed. Through a mixed modulation method of amplitude, frequency, and relative duty cycle, precise modulation of the grayscale level of the single-ended injection-type light-emitting device can be achieved. The single-ended injection-type light-emitting device in the present invention is single-ended electrically coupled and uses an induced electric field to drive the light emission, which can simplify the circuit connection of the display device and avoid a large number of transfer processes and complex bonding processes.
Description
Technical Field
The invention belongs to the technical fields of flat panel display, gray scale modulation and the like, and particularly relates to a gray scale modulation method of a single-end injection type light emitting device.
Background
Micro LIGHT EMITTING Diode (Micro-LED) display utilizes micron-sized (typically less than 50 μm) inorganic LED devices as light emitting pixels to realize active light emitting matrix displays. From the display technology principle, micro-LEDs and Organic LIGHT EMITTING Diodes (OLEDs) and Quantum dot LIGHT EMITTING diodes (QLEDs) belong to active light emitting display technologies. However, unlike the OLED and QLED display technologies, micro-LED display uses LED light-emitting chips such as inorganic Ga-N and the like, and has excellent light-emitting performance and long service life, and the industrialization of the Micro-LED display mainly faces the problems of an integration process and related materials.
The simple device structure of the single-ended injection type light-emitting diode is expected to be applied to novel Micro display technologies such as Micro-LEDs, nanometer pixel luminous display and the like, is a technology based on induced electric fields and capable of emitting light through internal carrier radiation recombination, reduces inter-electrode coupling, and solves the problem of accurate butt joint of electrode chips in a Micro size.
In the technical field of flat panel display, the micro light emitting device has various advantages, and most remarkable is that the micro light emitting device has low power consumption, high brightness, ultra-high definition, high color saturation, faster response speed, longer service life, higher working efficiency and the like, is a novel display technology of a reform type, and is expected to replace a TFT liquid crystal display to be almost applied to the field of flat panel display.
The existing LED display control mostly adopts a PWM modulation scheme, but pulse width modulation is suitable for a dc light emitting device, and the pulse width modulation technology has no obvious effect on gray scale modulation of a single-ended injection light emitting device, so a new suitable modulation scheme is needed.
Disclosure of Invention
In order to overcome the defects and the shortcomings in the prior art and fill the blank of a gray level modulation scheme of a single-end injection type light-emitting device, the invention provides a gray level modulation method for amplitude, frequency and relative duty ratio mixed modulation. According to the relation between the amplitude and the brightness, M reference voltages are selected, each reference voltage corresponds to one reference gray level, and according to the relation between the relative duty ratio and the brightness, under the condition that the external driving voltage and the driving frequency are fixed, gray level regulation of the relative duty ratio is carried out by changing the number P of square waves in a single period, namely, gray level regulation scheme of the light emitting times and the occupied driving time of a device in the single period is controlled.
The single-end injection type light-emitting device belongs to single-end electric coupling, adopts induced electric field to drive light emission, can simplify the line connection of the display device, and can avoid a huge transfer process and a complex bonding process.
The technical scheme adopted for solving the technical problems is as follows:
A gray level modulation method of single-end injection type light emitting device considers that the single-end injection type light emitting device emits light only in a positive half period, in order to improve display brightness, a single driving period is equally divided into N subframes according to the relation between amplitude and brightness, M reference voltages are selected according to the relation between amplitude and brightness, each reference voltage corresponds to one reference gray level, and gray level regulation and control of the relative duty ratio are carried out according to the relation between the relative duty ratio and brightness.
Further, the average division of a single drive period into N subframes is based on the relation of amplitude and brightness, specifically, the average division of a single drive period into N subframes is based on a frequency-brightness curve.
Further, according to the relation between the amplitude and the brightness, M reference voltages are selected, specifically, according to the amplitude-brightness curve and the gray scale number to be displayed, M reference voltages are selected.
Further, according to the relation between the relative duty ratio and the brightness, the gray scale control of the relative duty ratio specifically includes:
according to the persistence of vision characteristic of human eyes, under the condition of certain external driving voltage and driving frequency, the gray level is regulated and controlled by changing the number P of square waves in a single period.
Further, the implementation process of the scheme comprises the following steps:
step S1, dividing a single driving period into N subframes equally according to a frequency-brightness curve;
s2, selecting M reference voltages according to an amplitude-brightness curve and the gray scale number to be displayed, wherein each reference voltage corresponds to one reference gray scale;
and S3, determining the relative duty ratio corresponding to each gray level in the middle of the adjacent reference gray levels according to the relative duty ratio-brightness curve, and adjusting the gray levels through the relative duty ratio.
Further, the single-end injection type light emitting device is driven by alternating voltage, and the voltage waveform of the alternating electric field comprises one of sine wave, triangular wave, square wave and pulse or a combination thereof.
Further, the relative duty ratio refers to the number of subframes P, i.e., P/N, having an ac driving waveform in a single driving period.
Further, at least one of the upper electrode and the lower electrode of the single-ended injection type light emitting device is a transparent electrode.
Compared with the prior art, the gray scale modulation scheme suitable for the single-end injection type light-emitting device is designed according to the characteristics of the single injection type light-emitting device under different light-emitting modes and frequencies and by combining the visual characteristics of human eyes. The precise modulation of the gray level of the single-end injection type light-emitting device is realized through the mixed modulation of amplitude, frequency and relative duty ratio.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic diagram of an exemplary drive waveform according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exemplary driving voltage and light emission waveform according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the luminance of a device with different duty cycles according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the luminance of a device at different driving frequencies according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the luminance of a device under different duty cycle driving waveforms according to an embodiment of the present invention;
fig. 6 is a schematic diagram of the light emitting brightness of the device under different driving waveforms with different relative duty ratios according to an embodiment of the present invention.
Detailed Description
In order to make the features and advantages of the present patent more comprehensible, embodiments accompanied with figures are described in detail below:
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The invention aims to provide a gray scale modulation method of a single-end injection type light emitting device, which comprises the following steps of:
firstly, collecting a change curve of the brightness of a single-end injection type light-emitting device along with the change of amplitude, relative duty ratio and frequency, and obtaining an amplitude-brightness curve, a relative duty ratio-brightness curve and a frequency-brightness curve.
According to the amplitude-brightness curve, the relative duty cycle-brightness curve and the frequency-brightness curve of the light-emitting device, the comparison results in that the light-emitting brightness is affected most by the amplitude, and then the relative duty cycle and the frequency are affected least.
Considering that pulse width modulation is suitable for a direct current light emitting device, the adoption of a pulse width modulation technology has no obvious effect and rule on gray scale modulation of a single-end injection type light emitting device.
And then the single-end injection type light-emitting device emits light in the positive half period of the alternating current driving voltage, and the negative half period of the alternating current voltage does not emit light.
The gray level modulation method of the single-end injection type light-emitting device is designed, and according to the human eye integration and the human eye persistence effect, the brightness of different driving waveforms in a single light-emitting period is considered to be overlapped in human eye vision, so that the brightness perceived by human eyes is improved.
Specifically, a time-sharing driving method is adopted according to the visual persistence effect of human eyes. The human eye views, images on, and by input, perceives an image of the object. However, when the object is removed, the visual nerve does not immediately disappear, and the vision persistence (PERSISTENCE OF VISION) is a phenomenon that vision generated by light on the retina remains for a period of time after the light stops acting, for a period of time, which lasts for 0.1 seconds.
The above design process can be generalized to the following steps:
step 1, collecting a change curve of the brightness of a single-end injection type light-emitting device along with the change of amplitude, relative duty cycle and frequency, and obtaining an amplitude-brightness curve, a relative duty cycle-brightness curve and a frequency-brightness curve;
Step 2, comparing according to the amplitude-brightness curve, the relative duty cycle-brightness curve and the frequency-brightness curve of the light-emitting device to obtain that the light-emitting brightness is influenced by the amplitude most, and secondly, the relative duty cycle and the frequency are influenced least;
step 3, dividing a single driving period into N subframes equally according to a frequency-brightness curve;
Step 4, selecting M reference voltages according to the amplitude-brightness curve and the gray scale number to be displayed, wherein each reference voltage corresponds to one reference gray scale;
And 5, determining the relative duty ratio corresponding to each gray level in the middle of the adjacent reference gray levels according to the relative duty ratio-brightness curve. The gray scale is accurately adjusted through the relative duty ratio.
The single-ended injection light emitting device shown in the embodiment of the invention comprises, but is not limited to, a single-ended carrier injection inductance light emitting device and a carrier injection-free inductance light emitting device.
The light emitting mode is a single-ended injection electroluminescent mode, i.e. no ohmic contact is formed between one of the external electrodes and the light emitting device, the other electrode being directly connected to the light emitting device. The light emitting device is driven to emit light by periodic, indirect single-ended carrier injection.
Since the response speed of the single-ended injection type light emitting device is very fast, the period of the required ac driving waveform is particularly small, less than 0.01 seconds.
The light emission color thereof includes, but is not limited to, any one of red, green, blue and white.
The voltage waveform of the drive waveform alternating electric field includes, but is not limited to, a sine wave, a triangle wave, a square wave, a pulse, or a combination thereof.
At least one of the upper electrode and the lower electrode of the device is a transparent electrode, the material of the transparent electrode comprises but is not limited to graphene, indium tin oxide, carbon nano tubes, silver nano wires, copper nano wires or a combination thereof, and the material of the non-transparent electrode comprises but is not limited to gold, silver, aluminum, copper or a combination thereof.
The following further illustrates the design of the present invention by way of a specific example:
The six driving waveforms designed by the invention examples have the relative duty ratios of 1/10, 2/10, 4/10, 6/10, 8/10 and 10/10 respectively.
As shown in fig. 1, in the present embodiment, in dividing a single drive period into ten equal parts, wherein the single period is T, the first drive waveform has a relative duty ratio of 1/10, the second drive waveform has a relative duty ratio of 2/10, the third drive waveform has a relative duty ratio of 4/10, the fourth drive waveform has a relative duty ratio of 6/10, the fifth drive waveform has a relative duty ratio of 8/10, and the sixth drive waveform has a relative duty ratio of 10/10. As the relative duty cycle increases in a single cycle, the number of square waves in a single cycle also increases.
Dividing a single driving period into N subframes equally, selecting M reference voltages, wherein each reference voltage corresponds to one reference gray level, selecting driving waveforms with six relative duty ratios, and each waveform with the relative duty ratio corresponds to one gray level.
As shown in fig. 2, a light emitting diagram of the light emitting device under a square wave driving signal has two ordinate axes in fig. 2, which represent voltage (V) and relative brightness (EL), respectively. The alternating current characteristic of the whole light-emitting device is that the light-emitting device continuously emits light with the period of 2 mu s, and the light-emitting device emits light obviously only in the first half period of the square wave under the square wave driving signal, and emits light at the rising edge of the driving waveform.
As can be seen in fig. 2, the response speed of the single injection type light emitting device is very fast, the square wave emits light in a positive half period, and the square wave emits light in a lower half period in preparation for the next light emission.
As shown in fig. 3, in order that the light emitting device emits light with a square wave driving signal, the relative brightness varies with the duty cycle, and in fig. 3, the ordinate represents the relative brightness and the abscissa represents the square wave duty cycle.
As can be seen, in fig. 3, the relative brightness of the single-ended injection type light emitting device does not rise regularly with an increase in the duty cycle of the driving square wave.
In fig. 3, the light emitting device increases in relative light emission intensity with an increase in duty ratio within a certain range, and after the duty ratio exceeds 10%, the duty ratio increases and the relative light emission intensity decreases.
It can be seen that the device gray scale modulation method is not applicable to single ended injection type light emitting devices by varying the duty cycle.
As shown in fig. 4, the ordinate represents the relative luminance, and the abscissa represents the driving frequency, and the relative luminance of the light emitting device gradually increases as the driving frequency increases.
It is possible to control the luminance of the single-ended injection type light emitting device by changing the driving frequency.
As shown in fig. 5, six driving waveforms designed by the present embodiment are plotted on the ordinate as the relative brightness of the light emitting device, and on the abscissa as the driving frequency, where the six curves represent driving waveforms with different relative duty ratios, respectively.
In fig. 5, the driving frequency is constant, and the relative brightness of the light emitting device is gradually increased as the relative duty ratio is increased.
Therefore, when the external driving voltage is unchanged, the light-emitting brightness corresponding to the six driving waveforms is improved along with the improvement of the frequency, and the effect of increasing the gray level of the light-emitting device along with the improvement of the relative duty ratio is realized.
As shown in fig. 6, six driving waveforms designed in this embodiment are used, in which the ordinate axis in fig. 6 represents the relative brightness, and the abscissa axis represents the driving voltage, and the relative brightness of the light emitting device gradually increases as the driving voltage increases.
In fig. 6, the driving voltage is constant, the relative brightness of the light emitting device is gradually increased with the increase of the relative duty ratio, and the brightness of the light emitting device is regulated by the voltage and the relative duty ratio.
As shown in fig. 6, when the external driving frequency is unchanged, the light-emitting brightness corresponding to the six driving waveforms increases with the increase of the driving voltage, so that the effect of increasing the gray scale of the light-emitting device with the increase of the driving voltage is achieved.
When the frequency is unchanged and the externally applied driving voltage is increased, the carrier transport speed in the device is increased, more carriers flow into the single-end injection type light-emitting device for radiation recombination, and the light-emitting brightness of the device is also increased.
In summary, the invention designs the driving waveform with relative duty ratio by utilizing the time domain characteristic that the device only emits light in the positive half period, and performs mixed regulation and control on the brightness of the light emitting device by controlling the driving voltage and frequency, so that the driving voltage and driving frequency can be reduced, the energy consumption is reduced, the display gray level is improved, and the gray modulation of the single injection type light emitting device is more accurate under the condition that the brightness of the device is unchanged.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.
The present invention is not limited to the above-mentioned preferred embodiments, and any person can obtain a gray scale modulation method of a single-ended injection type light emitting device in various other forms under the teaching of the present invention, and all equivalent changes and modifications made according to the scope of the present invention should be covered by the present invention.
Claims (3)
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110690329A (en) * | 2019-10-16 | 2020-01-14 | 福州大学 | Single-ended electrical contact and single-ended carrier injection mu LED light emitting and display device and preparation method thereof |
| CN117133220A (en) * | 2023-08-28 | 2023-11-28 | 南京芯视元电子有限公司 | Dimmable pixel driving circuit and dimmable pixel driving system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000003155A (en) * | 1998-06-15 | 2000-01-07 | Nec Kansai Ltd | Display device drive method |
| JP2001343941A (en) * | 2000-05-30 | 2001-12-14 | Hitachi Ltd | Display device |
| CN117577047A (en) * | 2023-11-17 | 2024-02-20 | 福州大学 | Carrier-free injection type active display array driving structure with frequency regulation and control function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110690329A (en) * | 2019-10-16 | 2020-01-14 | 福州大学 | Single-ended electrical contact and single-ended carrier injection mu LED light emitting and display device and preparation method thereof |
| CN117133220A (en) * | 2023-08-28 | 2023-11-28 | 南京芯视元电子有限公司 | Dimmable pixel driving circuit and dimmable pixel driving system |
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