CN110570821A - OLED optical compensation method, compensation device and display driving chip - Google Patents
OLED optical compensation method, compensation device and display driving chip Download PDFInfo
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- CN110570821A CN110570821A CN201910880032.8A CN201910880032A CN110570821A CN 110570821 A CN110570821 A CN 110570821A CN 201910880032 A CN201910880032 A CN 201910880032A CN 110570821 A CN110570821 A CN 110570821A
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- pwm
- oled
- brightness information
- luminance
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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]
- G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
Abstract
The invention discloses an OLED optical compensation method, a compensation device and a display driving chip, wherein the method is characterized in that when the brightness information is smaller than a preset value, the light-emitting time of an OLED is adjusted by using a PWM pulse corresponding to the brightness information; and when the brightness information is larger than the preset value, the OLED driving voltage is adjusted by the voltage level corresponding to the brightness information. The apparatus includes a first LUT for voltage setting, a second LUT for PWM, a third LUT for luminance information, a first selector to select a range of voltage levels, a first interpolator to generate a target voltage level by interpolation operation, a second selector to select a range of PWM pulses, a second selector to generate a target PWM pulse width by interpolation operation, a pulse generator to generate a target PWM pulse, and a third selector to select a range of luminance. The driving chip comprises the compensation device. The application solves the problem of poor IV characteristics of the OLED in low voltage driving low brightness display.
Description
Technical Field
the present invention relates to an organic light emitting diode (hereinafter abbreviated as OLED) display panel, and more particularly, to an OLED optical compensation method, an OLED optical compensation device, and a display driving chip of an OLED display panel.
background
The OLED display panel differs in whiteness due to characteristic deviation of a manufacturing process thereof, and provides brightness different from brightness to be provided. Therefore, an optical compensation process is required to compensate for the brightness. Data for optical compensation has different values for each display panel, and a display driving chip that drives the display panels must have a memory (Look-Up-Table, LUT) capable of storing the data for optical compensation. By adjusting the output voltage driving the OLED to be amplitude-based brightness control, optical compensation data can be achieved. The IV characteristic (current characteristic with respect to voltage) of the OLED still has a problem in low voltage for driving low brightness display. Therefore, the present application provides a PWM and amplitude based OLED optical compensation method and compensation apparatus, which can adjust the OLED driving voltage and compensate the low luminance difference between OLED display panels by adjusting the light emitting time of the OLED at a specific luminance.
disclosure of Invention
A first object of the present invention is to provide a PWM and amplitude based OLED optical compensation method.
it is a second object of the present invention to provide an OLED optical compensation device based on PWM and amplitude.
The invention provides an OLED optical compensation method based on PWM and amplitude, which comprises the following steps: receiving brightness information; when the brightness information is smaller than the preset value, adjusting the light-emitting time of the OLED by using the PWM pulse corresponding to the brightness information; and when the brightness information is larger than the preset value, adjusting the OLED driving voltage by using the voltage level corresponding to the brightness information.
Preferably, in the step of adjusting the OLED driving voltage by using the voltage level corresponding to the luminance information, the voltage level corresponding to the luminance information is obtained by the following sub-steps: selecting two luminance bands closest to the luminance information from a voltage level lookup table, and selecting two voltage levels corresponding to the two luminance bands; and carrying out interpolation operation on the two selected voltage levels to obtain the voltage level corresponding to the brightness information.
Preferably, in the step of adjusting the light emitting time of the OLED by the PWM pulse corresponding to the brightness information, the PWM pulse corresponding to the brightness information is obtained by the following sub-steps: selecting two brightness frequency bands closest to the brightness information from a PWM lookup table, and selecting two PWM pulse widths corresponding to the two brightness frequency bands; performing interpolation operation on the two selected PWM pulse widths to obtain the PWM pulse width corresponding to the brightness information; and generating PWM pulses corresponding to the brightness information according to the pulse width.
Preferably, the PWM lookup table is a LUT, and the voltage level lookup table is a LUT.
The invention provides an OLED optical compensation device based on PWM and amplitude, which comprises:
A first LUT for voltage setting;
A second LUT for PWM;
a third LUT for luminance information;
a first selector for selecting two luminance bands closest to the input luminance information from the first LUT and selecting two voltage levels corresponding to the two luminance bands;
a first interpolator for interpolating the two voltage levels output by the first selector to obtain a voltage level corresponding to the input brightness information;
a second selector for selecting two luminance bands closest to the input luminance information from the second LUT and selecting two PWM pulse widths corresponding to the two luminance bands;
The second interpolator is used for carrying out interpolation operation on the two PWM pulse widths output by the second LUT to obtain the PWM pulse width corresponding to the input brightness information;
A pulse generator for generating a PWM pulse according to a pulse width output from the second interpolator;
and a third selector for selecting a luminance range corresponding to the input luminance information from the third LUT, and further turning on/off the first interpolator and the second interpolator.
preferably, the OLED optical compensation device further includes a frequency multiplier for dividing the PWM pulse output from the pulse generator into a plurality of pulses with smaller pulse widths.
The OLED optical compensation device can also be integrated in a display driving chip of the OLED display panel to form the display driving chip with the OLED optical compensation device.
Compared with the prior art, the invention has at least the following beneficial effects:
The problem of poor IV characteristics of the OLED in low voltage for driving low-brightness display is solved by adopting mixed compensation based on PWM and amplitude.
The compensation device uses LUT and interpolator, the data needed to be stored for optical compensation is greatly reduced, and the compensation device can be integrated in the display driving chip of the OLED display panel.
Drawings
FIG. 1 is an example of amplitude-based brightness control using a DBV input;
FIG. 2 is an example of PWM-based brightness control using a DBV input;
FIG. 3 is an example of an OLED sub-pixel circuit and EM pulse;
FIG. 4 is an example of dividing EM pulses;
FIG. 5 is an example of a PWM and amplitude based hybrid brightness control;
fig. 6 is an example of an OLED optical compensation device based on PWM and amplitude.
Detailed Description
the invention is further illustrated with reference to the following figures and examples.
the present invention combines amplitude-based brightness control and PWM-based brightness control for optical compensation of OLEDs. Specifically, when the input brightness information is smaller than a preset value, the light-emitting time of the OLED is adjusted by using a PWM pulse corresponding to the brightness information; and when the brightness information is larger than the preset value, adjusting the OLED driving voltage by using the voltage level corresponding to the brightness information.
in practice, in order to obtain the voltage level corresponding to the luminance information, a lookup table of the luminance information and the voltage level, which is referred to as a voltage level lookup table in this application, needs to be established in advance. Similarly, in order to obtain the PWM pulse corresponding to the brightness information, a lookup table of the brightness information and the PWM pulse width needs to be established in advance, which is referred to as a PWM lookup table in this application. The voltage level lookup table and the PWM lookup table are collectively referred to as data for optical compensation.
When the luminance information is large, the data for optical compensation may be large, and when the luminance information is implemented in the display driving chip of the OLED display panel, the volume and mass of the chip may be large, so that the data for optical compensation, which needs to be stored, should be reduced as much as possible. One implementation method is as follows: only part of the luminance information and the corresponding voltage levels are stored in the voltage level look-up table, and the remaining voltage levels are determined using interpolation. Similarly, only a portion of the luminance information and corresponding PWM pulse widths are stored in the PWM lookup table, and the remaining PWM pulse widths are determined using interpolation operations.
specifically, the voltage level corresponding to the luminance information is obtained by the following sub-steps: selecting two luminance frequency bands closest to the input luminance information from the voltage level lookup table, and selecting two voltage levels corresponding to the two luminance frequency bands; and then, carrying out interpolation operation on the two selected voltage levels to obtain the voltage level corresponding to the brightness information. An example of five drive voltage (voltage level 0 to voltage level 4) settings corresponding to five luminance information (band 0 to band 4) is shown in fig. 1. If the input luminance information is luminance information between frequency bands, the voltage level is determined by interpolation of adjacent two inflection points. For example, in fig. 1, when the supplied luminance information (DBV) is located between band 1 and band 2, the target voltage is determined by interpolation between voltage level 1 corresponding to band 1 and voltage level 2 corresponding to band 2. Thus, in the OLED driver chip, only voltage levels 0-4 and frequency bands 0-4 need to be implemented as LUTs.
Similarly, the PWM pulse corresponding to the brightness information is obtained by the following sub-steps: selecting two brightness frequency bands closest to the brightness information from a PWM lookup table, and selecting two PWM pulse widths corresponding to the two brightness frequency bands; performing interpolation operation on the two selected PWM pulse widths to obtain the PWM pulse width corresponding to the brightness information; and generating PWM pulses corresponding to the brightness information according to the pulse width. An example of five PWM pulse width (PWM0-PWM4) settings corresponding to five luminance information (band 0 to band 4) is shown in fig. 2. If the input luminance information is luminance information between frequency bands, the PWM pulse width is determined by interpolation of adjacent two inflection points. For example, in FIG. 2, when the supplied brightness information (DBV) is located between band 1 and band 2, the target pulse width is determined by interpolation between the PWM1 corresponding to band 1 and the PWM2 corresponding to band 2. Thus, in the OLED driver chip, only PWM0-4 and bands 0-4 need to be implemented as LUTs.
an example of an OLED subpixel and controlling OLED brightness by controlling the gate terminal of the M4 transistor is shown in fig. 3. As shown in fig. 3, by controlling the EM signal of the M4 transistor, the ELVDD voltage of the OLED may be turned on/off, and thus the current from ELVDD to ELVSS may be controlled to drive the OLED. The brightness can be controlled by PWM by setting the PWM pulse width corresponding to the input brightness information in a method similar to the OLED driving voltage control method.
when the PWM control is applied to display brightness, flicker may occur if the turn-off time of EM is long. This can be solved by dividing the EM pulse into several parts and allocating the light emission time of the OLED. Fig. 4 shows an example of dividing EM pulses into 2, 4, 8 and 16 times with 50% on-time.
fig. 5 shows an example of using both amplitude-based brightness control and PWM-based brightness control. If the input luminance information is greater than the value set in band 5, then amplitude-based luminance control is employed, i.e., the display luminance is controlled by adjusting the OLED display drive voltage. If the input luminance information is less than the value set in band 5, PWM-based luminance control, that is, OLED light-emitting time is adjusted by PWM pulse to control display luminance, is employed.
The transition point between PWM-based brightness control and amplitude-based brightness control is adjustable.
Fig. 6 shows a block diagram of a PWM and amplitude based OLED optical compensation device. As shown in fig. 6, the present OLED optical compensation device includes: a first LUT 1 for voltage setting, a second LUT3 for PWM, a third LUT2 for luminance information, a first selector 4, a second selector 6, a third selector 5, a first interpolator 7, a second interpolator 8, and a pulse generator 9. The first selector 4 is used to select two luminance bands closest to the input luminance information from the first LUT 1 and select two voltage levels corresponding to the two luminance bands. The first interpolator 7 is configured to interpolate the two voltage levels output by the first selector 4 to obtain a voltage level corresponding to the input luminance information. The second selector 6 is configured to select two luminance bands closest to the input luminance information from the second LUT3 and select two PWM pulse widths corresponding to the two luminance bands. The second interpolator 8 is configured to interpolate two PWM pulse widths output from the second LUT3 to obtain a PWM pulse width corresponding to the input luminance information. The pulse generator 9 is used for generating PWM pulses according to the pulse width output by the second interpolator 8. The third selector 5 is used to select a luminance range corresponding to the input luminance information from the third LUT2, thereby turning on/off the first interpolator 7 and the second interpolator 8.
as another embodiment, a frequency multiplier is further connected to the output end of the pulse generator, and the frequency multiplier is used for dividing the PWM pulse output by the pulse generator into a plurality of pulses with smaller pulse widths, so as to implement the function shown in fig. 4, so as to avoid flicker caused by longer turn-off time of EM when the display brightness is controlled by PWM.
The OLED optical compensation device based on PWM and amplitude can be further integrated into a display driving chip of an OLED display panel to form the display driving chip with the OLED optical compensation device.
The present invention has been described in detail with reference to the specific embodiments, and the detailed description is only for the purpose of helping those skilled in the art understand the present invention, and is not to be construed as limiting the scope of the present invention. Various modifications, equivalent changes, etc. made by those skilled in the art under the spirit of the present invention shall be included in the protection scope of the present invention.
Claims (8)
1. An OLED optical compensation method based on PWM and amplitude is characterized by comprising the following steps:
Receiving brightness information;
When the brightness information is smaller than the preset value, adjusting the light-emitting time of the OLED by using the PWM pulse corresponding to the brightness information;
and when the brightness information is larger than the preset value, adjusting the OLED driving voltage by using the voltage level corresponding to the brightness information.
2. the PWM and amplitude based OLED optical compensation method according to claim 1, wherein in the step of adjusting the OLED driving voltage by the voltage level corresponding to the brightness information, the voltage level corresponding to the brightness information is obtained by the following sub-steps:
Selecting two luminance bands closest to the luminance information from a voltage level lookup table, and selecting two voltage levels corresponding to the two luminance bands;
And carrying out interpolation operation on the two selected voltage levels to obtain the voltage level corresponding to the brightness information.
3. the PWM and amplitude based OLED optical compensation method according to claim 2, wherein in the step of adjusting the OLED lighting time by the PWM pulse corresponding to the brightness information, the PWM pulse corresponding to the brightness information is obtained by the following sub-steps:
Selecting two brightness frequency bands closest to the brightness information from a PWM lookup table, and selecting two PWM pulse widths corresponding to the two brightness frequency bands;
Performing interpolation operation on the two selected PWM pulse widths to obtain the PWM pulse width corresponding to the brightness information;
And generating PWM pulses corresponding to the brightness information according to the pulse width.
4. The PWM and amplitude based OLED optical compensation method of claim 2, wherein the PWM lookup table is a LUT and the voltage level lookup table is a LUT.
5. An OLED optical compensation device based on PWM and amplitude is characterized by comprising:
a first LUT for voltage setting;
A second LUT for PWM;
A third LUT for luminance information;
A first selector for selecting two luminance bands closest to the input luminance information from the first LUT and selecting two voltage levels corresponding to the two luminance bands;
a first interpolator for interpolating the two voltage levels output by the first selector to obtain a voltage level corresponding to the input brightness information;
a second selector for selecting two luminance bands closest to the input luminance information from the second LUT and selecting two PWM pulse widths corresponding to the two luminance bands;
The second interpolator is used for carrying out interpolation operation on the two PWM pulse widths output by the second LUT to obtain the PWM pulse width corresponding to the input brightness information;
A pulse generator for generating a PWM pulse according to a pulse width output from the second interpolator;
and a third selector for selecting a luminance range corresponding to the input luminance information from the third LUT, and further turning on/off the first interpolator and the second interpolator.
6. the PWM and amplitude based OLED optical compensation apparatus of claim 5, further comprising a frequency multiplier for dividing the PWM pulses output by the pulse generator into a plurality of pulses with smaller pulse widths.
7. A display driving chip of an OLED display panel, comprising the PWM and amplitude based OLED optical compensation apparatus of claim 5.
8. a display driving chip of an OLED display panel, comprising the PWM and amplitude based OLED optical compensation apparatus of claim 6.
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| CN201910880032.8A CN110570821A (en) | 2019-09-18 | 2019-09-18 | OLED optical compensation method, compensation device and display driving chip |
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| CN201910880032.8A CN110570821A (en) | 2019-09-18 | 2019-09-18 | OLED optical compensation method, compensation device and display driving chip |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111402823A (en) * | 2019-12-05 | 2020-07-10 | 友达光电股份有限公司 | Display system |
| CN111524483A (en) * | 2020-04-23 | 2020-08-11 | 福建华佳彩有限公司 | OLED external compensation circuit and OLED external compensation method |
| CN111798813A (en) * | 2020-07-20 | 2020-10-20 | 昆山国显光电有限公司 | Brightness adjusting method and device of display device and display device |
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Application publication date: 20191213 |