CN112331143A - Segmented adjustable gamma correction method for silicon-based OLED micro-display - Google Patents
Segmented adjustable gamma correction method for silicon-based OLED micro-display Download PDFInfo
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- CN112331143A CN112331143A CN202011351762.8A CN202011351762A CN112331143A CN 112331143 A CN112331143 A CN 112331143A CN 202011351762 A CN202011351762 A CN 202011351762A CN 112331143 A CN112331143 A CN 112331143A
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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]
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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
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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Abstract
A method of piecewise adjustable gamma correction for a silicon-based OLED microdisplay, the method comprising the steps of: acquiring input data of the silicon-based OLED micro-display; acquiring output data of the silicon-based OLED micro-display; calculating a gamma correction curve from the input data and the output data; acquiring a maximum light-emitting brightness point and a minimum light-emitting brightness point of the silicon-based OLED micro-display; forming a plurality of sections of sequentially connected sectional straight lines between the maximum light-emitting brightness point and the minimum light-emitting brightness point; fitting the gamma correction curve using the piecewise straight line. The method can be used for improving the nonlinearity of a human eye vision system for brightness perception, the nonlinear function is formed by fitting a piecewise linear function and is realized based on a lookup table and a linear interpolation algorithm, an internal register value is configured through a 12C bus, piecewise adjustability is achieved according to the actual lighting condition, and higher correction precision can be obtained in a low-brightness area to adapt to gamma characteristics.
Description
Technical Field
The invention belongs to the technical field of silicon-based OLED micro-displays, and particularly relates to a segmented adjustable gamma correction method for a silicon-based OLED micro-display.
Background
A silicon-based Organic Light Emitting Diode (OLED) micro-display is a new display which is popular in the research of the display field along with the development of VR/AR technology in recent years, wherein an organic light emitting diode is directly integrated with a monocrystalline silicon integrated circuit, monocrystalline silicon is used as a substrate of an OLED light emitting device, and a pixel driving system and a peripheral driving system of the light emitting device are completed by utilizing a mature CMOS process.
Gamma correction originally stems from the problem of non-linearity of the electrical-to-optical conversion in a cathode ray tube display, where the electron beam produced by the tube and its resulting image brightness correspond exponentially to the input voltage. Whereas for OLED displays the luminance is linear with the current through the OLED device, in practice the perception of luminance variations by the human visual system is also non-linear. Gamma correction is a transfer function introduced to overcome this non-linearity and is widely used in video streaming, computer graphics, and other imaging systems.
Two common gamma correction methods are used: one is to carry on the digital modeling to the gamma characteristic of the display system, calculate the video drive data after correcting, store in the memorizer in advance, adopt the look-up table method to realize the gamma correction of the picture in the course of revealing, said method is digital correction, but need to occupy the greater storage space; the other method is that a gray scale voltage generating circuit is formed by a precise resistor and an operational amplifier on the periphery of a driving circuit, a multi-level reference voltage is provided, and the gamma correction of an image signal is realized together with a display driving circuit.
Disclosure of Invention
In view of the above, the present invention provides a segment tunable gamma correction method for a silicon-based OLED microdisplay that overcomes, or at least partially solves, the above problems.
In order to solve the technical problem, the invention provides a piecewise adjustable gamma correction method for a silicon-based OLED micro-display, which comprises the following steps:
acquiring input data of the silicon-based OLED micro-display;
acquiring output data of the silicon-based OLED micro-display;
calculating a gamma correction curve from the input data and the output data;
acquiring a maximum light-emitting brightness point and a minimum light-emitting brightness point of the silicon-based OLED micro-display;
forming a plurality of sections of sequentially connected sectional straight lines between the maximum light-emitting brightness point and the minimum light-emitting brightness point;
fitting the gamma correction curve using the piecewise straight line.
Preferably, the acquiring input data of the silicon-based OLED micro-display comprises the steps of:
the control unit of the silicon-based OLED micro-display activates the data input unit;
the control unit sends an input data reading instruction to the data input unit;
the data input unit receives input data input from the outside;
the data input unit sends the input data to the control unit.
Preferably, the acquiring input data of the silicon-based OLED micro-display further comprises the steps of:
the data input unit analyzes the input data amount of the input data received by the data input unit;
the data input unit sends the input data amount to the control unit.
Preferably, the acquiring the output data of the silicon-based OLED micro-display comprises the steps of:
the control unit of the silicon-based OLED micro-display activates the data output unit;
the control unit sends an output data reading instruction to the data output unit;
the control unit sends output data to the data output unit
The data output unit outputs the output data to the outside.
Preferably, the acquiring the output data of the silicon-based OLED micro-display further comprises the steps of:
the data output unit analyzes the output data quantity of the output data sent by the data output unit;
and the data output unit sends the output data volume to the control unit.
Preferably, the acquiring the maximum light emitting brightness point and the minimum light emitting brightness point of the silicon-based OLED micro-display includes:
acquiring the maximum value and the minimum value of the output data;
taking the position of the maximum value corresponding to the silicon-based OLED micro-display as the maximum light emitting brightness point;
and taking the position of the minimum value corresponding to the micro-display of the silicon-based OLED as the minimum light emitting brightness point.
Preferably, the forming a plurality of segment straight lines connected in sequence between the maximum light emission luminance point and the minimum light emission luminance point includes:
dividing the region between the maximum light-emitting brightness point and the minimum light-emitting brightness point into a high gray level region and a low gray level region according to the gray level of the input data;
selecting a first number of luminance points along the gamma correction curve in the high gray level region;
selecting a second number of luminance points along the gamma correction curve in the low gray level region;
and sequentially connecting all the brightness along the gamma correction curve to obtain the segmentation straight line.
Preferably, the first number is equal to or less than the second number.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: the piecewise adjustable gamma correction method for the silicon-based OLED micro-display can be used for improving the nonlinearity of a human eye visual system for brightness perception, the nonlinear function is formed by piecewise linear function fitting and is realized based on a lookup table and a linear interpolation algorithm, an internal register value is configured through an I2C bus, piecewise adjustment is achieved according to the actual light emitting condition, and higher correction precision can be obtained in a low-brightness area to adapt to the gamma characteristic.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart illustrating a method for piecewise adjustable gamma correction for a silicon-based OLED microdisplay according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, 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 invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In an embodiment of the present application, as shown in fig. 1, the present invention provides a segment-tunable gamma correction method for a silicon-based OLED microdisplay, the method comprising the steps of:
s1: acquiring input data of the silicon-based OLED micro-display;
s2: acquiring output data of the silicon-based OLED micro-display;
s3: calculating a gamma correction curve from the input data and the output data;
s4: acquiring a maximum light-emitting brightness point and a minimum light-emitting brightness point of the silicon-based OLED micro-display;
s5: forming a plurality of sections of sequentially connected sectional straight lines between the maximum light-emitting brightness point and the minimum light-emitting brightness point;
s6: fitting the gamma correction curve using the piecewise straight line.
In the embodiment of the application, when the segmented adjustable gamma correction is performed on the silicon-based OLED micro-display, specifically, the input data of the silicon-based OLED micro-display is firstly acquired, then the output data of the silicon-based OLED micro-display is acquired, and then a gamma correction curve is calculated according to the input data and the output data; and then obtaining a maximum light-emitting brightness point and a minimum light-emitting brightness point of the silicon-based OLED micro-display, forming a plurality of sequentially connected segmented straight lines between the maximum light-emitting brightness point and the minimum light-emitting brightness point, and finally fitting the gamma correction curve by using the segmented straight lines.
In this embodiment of the present application, the acquiring input data of the silicon-based OLED micro-display in step S1 includes the steps of:
the control unit of the silicon-based OLED micro-display activates the data input unit;
the control unit sends an input data reading instruction to the data input unit;
the data input unit receives input data input from the outside;
the data input unit sends the input data to the control unit.
In the embodiment of the application, when input data of a silicon-based OLED micro-display is acquired, specifically, first, a control unit of the silicon-based OLED micro-display activates a data input unit, then the control unit sends an input data reading instruction to the data input unit, then the data input unit receives input data input from the outside, and finally the data input unit sends the input data to the control unit.
In this embodiment of the present application, the acquiring input data of the silicon-based OLED micro-display in step S1 further includes the steps of:
the data input unit analyzes the input data amount of the input data received by the data input unit;
the data input unit sends the input data amount to the control unit.
In the embodiment of the present application, when acquiring input data of a silicon-based OLED micro-display, specifically, the data input unit analyzes an input data amount of the input data received by itself after the data input unit transmits the input data to the control unit, and then the data input unit transmits the input data amount to the control unit.
In this embodiment of the present application, the acquiring the output data of the silicon-based OLED micro-display in step S2 includes the steps of:
the control unit of the silicon-based OLED micro-display activates the data output unit;
the control unit sends an output data reading instruction to the data output unit;
the control unit sends output data to the data output unit
The data output unit outputs the output data to the outside.
In the embodiment of the application, when the output data of the silicon-based OLED micro-display is obtained, specifically, first, a control unit of the silicon-based OLED micro-display activates a data output unit, then the control unit sends an output data reading instruction to the data output unit, then the control unit sends output data to the data output unit, and finally the data output unit outputs the output data to the outside.
In this embodiment of the present application, the acquiring the output data of the silicon-based OLED micro-display in step S2 further includes the steps of:
the data output unit analyzes the output data quantity of the output data sent by the data output unit;
and the data output unit sends the output data volume to the control unit.
In the embodiment of the application, when the output data of the silicon-based OLED micro-display is acquired, specifically, after the data output unit outputs the output data to the outside, the data output unit analyzes the output data amount of the output data sent by itself, and then the data output unit sends the output data amount to the control unit.
In this embodiment of the present application, the obtaining the maximum light emitting brightness point and the minimum light emitting brightness point of the silicon-based OLED micro-display in step S4 includes the steps of:
acquiring the maximum value and the minimum value of the output data;
taking the position of the maximum value corresponding to the silicon-based OLED micro-display as the maximum light emitting brightness point;
and taking the position of the minimum value corresponding to the micro-display of the silicon-based OLED as the minimum light emitting brightness point.
In the embodiment of the present application, when obtaining the maximum light emitting luminance point and the minimum light emitting luminance point of the silicon-based OLED micro display, specifically, first obtain the maximum value and the minimum value of the output data, then use the position of the maximum value on the silicon-based OLED micro display as the maximum light emitting luminance point, and then use the position of the minimum value on the silicon-based OLED micro display as the minimum light emitting luminance point.
In the embodiment of the present application, the step S5 of forming a plurality of sequentially connected segment straight lines between the maximum light emission luminance point and the minimum light emission luminance point includes the steps of:
dividing the region between the maximum light-emitting brightness point and the minimum light-emitting brightness point into a high gray level region and a low gray level region according to the gray level of the input data;
selecting a first number of luminance points along the gamma correction curve in the high gray level region;
selecting a second number of luminance points along the gamma correction curve in the low gray level region;
and sequentially connecting all the brightness along the gamma correction curve to obtain the segmentation straight line.
In the embodiment of the present application, when a plurality of sequentially connected segment straight lines are formed between the maximum light emission luminance point and the minimum light emission luminance point, specifically, a region between the maximum light emission luminance point and the minimum light emission luminance point is first divided into a high gray level region and a low gray level region according to the gray level of the input data, then a first number of luminance points are selected along the gamma correction curve in the high gray level region, then a second number of luminance points are selected along the gamma correction curve in the low gray level region, and then all of the luminances are sequentially connected along the gamma correction curve and the segment straight line is obtained.
In the embodiment of the present application, the first number is equal to or less than the second number.
The piecewise adjustable gamma correction method for the silicon-based OLED micro-display can be used for improving the nonlinearity of a human eye visual system for brightness perception, the nonlinear function is formed by piecewise linear function fitting and is realized based on a lookup table and a linear interpolation algorithm, an internal register value is configured through an I2C bus, piecewise adjustment is achieved according to the actual light emitting condition, and higher correction precision can be obtained in a low-brightness area to adapt to the gamma characteristic.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method of piecewise adjustable gamma correction for a silicon-based OLED microdisplay, the method comprising the steps of:
acquiring input data of the silicon-based OLED micro-display;
acquiring output data of the silicon-based OLED micro-display;
calculating a gamma correction curve from the input data and the output data;
acquiring a maximum light-emitting brightness point and a minimum light-emitting brightness point of the silicon-based OLED micro-display;
forming a plurality of sections of sequentially connected sectional straight lines between the maximum light-emitting brightness point and the minimum light-emitting brightness point;
fitting the gamma correction curve using the piecewise straight line.
2. The piecewise adjustable gamma correction method for a silicon-based OLED microdisplay of claim 1, wherein the obtaining input data for a silicon-based OLED microdisplay comprises the steps of:
the control unit of the silicon-based OLED micro-display activates the data input unit;
the control unit sends an input data reading instruction to the data input unit;
the data input unit receives input data input from the outside;
the data input unit sends the input data to the control unit.
3. The piecewise adjustable gamma correction method for a silicon-based OLED microdisplay of claim 2, wherein the obtaining input data for a silicon-based OLED microdisplay further comprises the steps of:
the data input unit analyzes the input data amount of the input data received by the data input unit;
the data input unit sends the input data amount to the control unit.
4. The method of claim 1, wherein the obtaining output data of the silicon-based OLED microdisplay comprises the steps of:
the control unit of the silicon-based OLED micro-display activates the data output unit;
the control unit sends an output data reading instruction to the data output unit;
the control unit sends output data to the data output unit
The data output unit outputs the output data to the outside.
5. The piecewise adjustable gamma correction method for a silicon-based OLED microdisplay of claim 4, wherein the obtaining output data of the silicon-based OLED microdisplay further comprises the steps of:
the data output unit analyzes the output data quantity of the output data sent by the data output unit;
and the data output unit sends the output data volume to the control unit.
6. The piecewise adjustable gamma correction method of claim 1, wherein the obtaining a maximum light emission luminance point and a minimum light emission luminance point of the silicon-based OLED microdisplay comprises the steps of:
acquiring the maximum value and the minimum value of the output data;
taking the position of the maximum value corresponding to the silicon-based OLED micro-display as the maximum light emitting brightness point;
and taking the position of the minimum value corresponding to the micro-display of the silicon-based OLED as the minimum light emitting brightness point.
7. The method of claim 1, wherein said forming a plurality of sequentially connected segment straight lines between said maximum and minimum light emitting luminance points comprises the steps of:
dividing the region between the maximum light-emitting brightness point and the minimum light-emitting brightness point into a high gray level region and a low gray level region according to the gray level of the input data;
selecting a first number of luminance points along the gamma correction curve in the high gray level region;
selecting a second number of luminance points along the gamma correction curve in the low gray level region;
and sequentially connecting all the brightness along the gamma correction curve to obtain the segmentation straight line.
8. The method of segment adjustable gamma correction for a silicon-based 0LED micro-display of claim 7, wherein the first number is less than or equal to the second number.
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