CN105244007B - A kind of generation method and device of the grayscale correction chart of camber display screen - Google Patents
A kind of generation method and device of the grayscale correction chart of camber display screen Download PDFInfo
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Abstract
The embodiment of the invention discloses the generation methods and device of a kind of grayscale correction chart of camber display screen, are related to image display arts, to improve the show uniformity of camber display screen, and then promote the display effect of camber display screen.In embodiments of the present invention, it determines for being characterized under preset gray scale, the intrinsic brilliance table of the intrinsic brilliance value of each pixel unit；According to the intrinsic brilliance value average value of several sampled pixel units, determine for being characterized under preset gray scale, the object brightness table of each pixel unit need target brightness value to be achieved；For any pixel unit in camber display screen, compare intrinsic brilliance value of the pixel unit under preset gray scale and the diversity factor between target brightness value, according to comparison result and the pixel unit in camber display screen the corresponding gamma curve in residing region, calculate pixel unit grayscale correction value corresponding under preset gray scale；And generate the grayscale correction chart corresponding to the pixel unit；To solve the above problem.
Description
Technical field
The present invention relates to the generation method of image display arts more particularly to a kind of grayscale correction chart of camber display screen and
Device.
Background technology
With the development of display technology, the display screens such as television set, monitor are gradually sent out towards large screen and superelevation Qinghua
Exhibition.On the one hand, 55 cun and 55 cun or more of product is increasingly becoming mainstream；On the other hand, UHD (Ultra High are based on
Definition, ultra high-definition) the UHD products of 3840 × 2160 (4K × 2K) of display technology quickly popularize.Wherein, UD shows skill
Art is the Next Generation Television display technology of HD (High Definition, high definition), Full HD (full HD).
Existing display screen can be divided into flexible display screen (alternatively referred to as camber display screen) and Rigid displays (alternatively referred to as
Flat-faced screen).In general, camber display screen uses flexible material for substrate, is to bend to display panel stress centainly
Curvature can greatly enhance telepresenc effect true to nature so as to improve the viewing visual angle of user.
However, current camber display screen has the disadvantage that：First, display screen part can be sent out by stress optical property
Some raw irregular variations make image appearance for the bad problem of local colour cast, uniformity, speck, color lump etc. occur；The
Two, since module deforms, so that the design of optical component (light guide plate, reflected light path) performance parameters is slightly variable, lead to even back
Property index reduce.
Invention content
The embodiment of the present invention provides a kind of generation method and device of the grayscale correction chart of camber display screen, to improve song
The show uniformity of face display screen, and then promote the display effect of camber display screen.
An embodiment of the present invention provides a kind of generation method of the grayscale correction chart of camber display screen, this method includes：
When each pixel unit in camber display screen shows same preset gray scale, determine described pre- for being characterized in
If under grayscale, the intrinsic brilliance table of the intrinsic brilliance value of each pixel unit；
According to preset rules, pixel unit that several are in different predeterminated positions is chosen as sampled pixel unit；Root
It is determined using interpolation algorithm for being characterized according to the average value of the intrinsic brilliance value of several sampled pixel units
It states under preset gray scale, the object brightness table of each pixel unit need target brightness value to be achieved；
For any pixel unit in the camber display screen, the pixel unit is compared under the preset gray scale
Diversity factor between intrinsic brilliance value and target brightness value, according to comparison result and the pixel unit in the camber display screen
The corresponding gamma curve in residing region calculates pixel unit grayscale correction value corresponding under the preset gray scale；
According to corresponding grayscale correction value under each grayscale of the pixel unit within a preset range, the pixel list is generated
Grayscale correction chart corresponding to member.
An embodiment of the present invention provides a kind of generating means of the grayscale correction chart of camber display screen, which includes：
Intrinsic brilliance determination unit, when showing same preset gray scale for each pixel unit in camber display screen,
It determines for being characterized under the preset gray scale, the intrinsic brilliance table of the intrinsic brilliance value of each pixel unit；
Object brightness determination unit, for according to preset rules, choosing several pixel lists for being in different predeterminated positions
Member is used as sampled pixel unit；According to the average value of the intrinsic brilliance value of several sampled pixel units, calculated using interpolation
Method is determined for being characterized under the preset gray scale, each pixel unit needs the target of target brightness value to be achieved bright
Spend table；
Computing unit, for for any pixel unit in the camber display screen, comparing the pixel unit in institute
The intrinsic brilliance value under preset gray scale and the diversity factor between target brightness value are stated, according to comparison result and the pixel unit in institute
The corresponding gamma curve in residing region in camber display screen is stated, pixel unit ash corresponding under the preset gray scale is calculated
Rank correction value；
Generation unit, for according to corresponding grayscale amendment under the pixel unit each grayscale within a preset range
Value, generates the grayscale correction chart corresponding to the pixel unit.
It can be seen from the above technical proposal that in embodiments of the present invention, first, obtaining the actual displayed of camber display screen
Brightness；Then, the target display brightness of camber display screen is obtained；Later, according to actual displayed brightness and target display brightness it
Between diversity factor and the camber display screen hardware feature corresponding to gamma curve, determine the ash of the camber display screen
Rank correction value, and then generate the grayscale correction value of the camber display screen.Specifically, for the hardware feature of camber display screen,
Such as bending degree, since the different zones of camber display screen have corresponded to different gamma curves, dimension is determining actual displayed
Brightness, using the corresponding gamma curve of corresponding region, is modified current gray with after the diversity factor of target display brightness,
To obtain the corresponding grayscale correction value of the grayscale, and then each grayscale institute of each pixel unit in generation camber display screen is right
The grayscale correction value answered, to generate the corresponding grayscale correction chart of each pixel unit institute, it is seen then that in the embodiment of the present invention
In grayscale correction chart in contain the pixel unit corresponding grayscale correction value under different grayscale；In this way, working as curved surface
When display screen is shown according to above-mentioned grayscale correction value, capable of eliminating Mura, (Mura, which refers to that brightness of display screen is uneven, to be caused
The phenomenon that various traces), blanking bar, local colour cast, color spot the problems such as, and then improve the uniformity of display screen.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these attached drawings
His attached drawing.
Fig. 1 is a kind of flow signal of generation method of the grayscale correction chart of camber display screen provided in an embodiment of the present invention
Figure；
Fig. 2 is the flow diagram of the generation method of grayscale correction chart flow provided in an embodiment of the present invention；
Fig. 3 (a) is the schematic diagram of positioning graph card provided in an embodiment of the present invention；
Fig. 3 (b) is the structural schematic diagram of curved surface liquid crystal module in the prior art；
Fig. 3 (c) is the structural schematic diagram in local colour cast region in flexible displays in the prior art；
Fig. 4 (a) is the corresponding correction data table of 64 grayscale in the prior art；
Fig. 4 (b) is the corresponding correction data table of 64 grayscale in the embodiment of the present invention；
Fig. 5 is the amendment of grayscale signal provided in an embodiment of the present invention and the flow diagram of flow for displaying；
Fig. 6 is a kind of structural representation of the generating means of the grayscale correction chart of camber display screen provided in an embodiment of the present invention
Figure.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
The embodiment of the present invention can be applied to all kinds of TFT (Thin Film Transistor, thin film transistor (TFT)) formula display screen,
It is particularly suitable for curved surface TFT formula display screens.Since TFT formula display screens are thin film transistor active matrix liquid crystal display part, because
This TFT formula display screen all has backlight, and curved surface TFT formula display screens are carried out plane TFT formula display screens using special process
It is bent to form, therefore curved surface TFT formulas display screen not only has backlight, also has certain curved surface characteristic.Wherein, no matter TFT
Formula display screen or curved surface TFT formulas display screen all have a variety of different backlight modes, such as direct-type backlight, side light emitting type backlight
Mode.
It should be noted that for convenience, can TFT formula display screens be referred to as display screen below, by curved surface TFT formulas
Display screen is referred to as camber display screen.
Fig. 1 shows a kind of flow of the generation method of the grayscale correction chart of camber display screen provided in an embodiment of the present invention
Schematic diagram, as shown in Figure 1, the flow includes：
Step 11：When each pixel unit in camber display screen shows same preset gray scale, determine for characterizing
In the intrinsic brilliance table of the upper and lower intrinsic brilliance value for stating each pixel unit of above-mentioned preset gray scale.
Step 12：According to preset rules, pixel unit that several are in different predeterminated positions is chosen as sampled pixel
Unit；According to the average value of the intrinsic brilliance value of several above-mentioned sampled pixel units, using interpolation algorithm, determine to be used for table
It levies in the upper and lower object brightness table for stating each pixel unit need target brightness value to be achieved of above-mentioned preset gray scale.
Step 13：For any pixel unit in above-mentioned camber display screen, the pixel unit is compared above-mentioned default
Intrinsic brilliance value under grayscale and the diversity factor between target brightness value, according to comparison result and the pixel unit in above-mentioned curved surface
The corresponding gamma curve in residing region in display screen calculates pixel unit grayscale amendment corresponding under above-mentioned preset gray scale
Value.
Step 14：According to corresponding grayscale correction value under each grayscale of the pixel unit within a preset range, generate
Grayscale correction chart corresponding to the pixel unit.
Optionally, in above-mentioned steps 11, intrinsic brilliance table is determined as follows：Using filming apparatus, shoot
Image for the shooting brightness value for characterizing each pixel unit in above-mentioned camber display screen；And brightness Acquisition Instrument is utilized, acquisition
Intrinsic brilliance value of the brightness value of at least one of above-mentioned camber display screen presetted pixel unit as the pixel unit, and really
Make above-mentioned presetted pixel unit shooting brightness value corresponding in the image that shooting obtains；Calculate above-mentioned presetted pixel unit
Shooting brightness value and intrinsic brilliance value between ratio, according to same ratio, using in addition to above-mentioned presetted pixel unit
The shooting brightness value of each pixel unit determines the intrinsic brilliance value of each pixel unit one by one；According under above-mentioned preset gray scale
Above-mentioned camber display screen in each pixel intrinsic brilliance value set, generate the intrinsic brilliance table under above-mentioned preset gray scale.
Optionally, in step 13, the pixel unit is obtained the location of in above-mentioned camber display screen；Judge above-mentioned
Whether position belongs in above-mentioned camber display screen the local colour cast region that local colour cast phenomenon occurs, if it is, obtaining advance
First gamma curve being arranged and corresponding with above-mentioned part colour cast region determines the pixel using above-mentioned first gamma curve
The grayscale correction value of unit；Otherwise, the second gamma curve pre-set and corresponding with non local colour cast region, profit are obtained
With above-mentioned second gamma curve, the grayscale correction value of the pixel unit is determined；Wherein, above-mentioned local colour cast region is according to above-mentioned
What the curved surface bending degree of camber display screen was determined, and above-mentioned first gamma curve is differed with above-mentioned second gamma curve.
Since the bending of camber display screen is since stress generates, the curved surface degree of camber display screen can reflect that curved surface is aobvious
The stressing conditions and its bending degree at each position of display screen.
Optionally, pending to being used to indicate according to generated grayscale correction chart in needs after above-mentioned steps 14
When the grayscale signal of picture frame is modified, the location information and grayscale of the pixel unit represented by above-mentioned grayscale signal
Value, in generated grayscale correction chart, finds corresponding grayscale correction value；According to the grayscale correction value found, to upper
It states pixel unit and carries out grayscale amendment, and export revised grayscale signal.
Optionally, in above-mentioned steps, if in above-mentioned grayscale correction chart, the grayscale with the pixel unit is not found
The corresponding grayscale correction value of value, then：The first grayscale amendment corresponding with the first grayscale value is searched in above-mentioned grayscale correction chart
Value and the second grayscale correction value corresponding with the second grayscale value；Determine above-mentioned first grayscale value and above-mentioned second grayscale value it
Between the first difference and above-mentioned first grayscale correction value and above-mentioned second grayscale correction value between the second difference；In calculating
The ratio between the first difference and above-mentioned second difference is stated, according to same ratio, is calculated and the grayscale value of pixel unit institute
Corresponding grayscale correction value；Wherein, the value of above-mentioned first grayscale value and the second grayscale value is different.
The embodiment of the present invention is described in detail below.
The embodiment of the present invention may include amendment and flow for displaying that grayscale correction chart flow and grayscale signal is generated in advance.Its
In, the grayscale correction chart being generated in advance can be built in display screen, so that display screen is in the amendment and display for carrying out grayscale signal
In flow, using built-in grayscale correction chart (for convenience, alternatively referred to as correction data table or look-up table) to be shown
Grayscale signal be modified and show.Above-mentioned two flow is described in detail separately below.
First, it is illustrated to grayscale correction chart flow is generated in advance.
Fig. 2 shows the flow diagram of the generation method of grayscale correction chart flow provided in an embodiment of the present invention, such as Fig. 2
Shown, which may include：
Step 21：When each pixel unit in camber display screen shows same preset gray scale, determine for characterizing
In the intrinsic brilliance table of the upper and lower intrinsic brilliance value for stating each pixel unit of above-mentioned preset gray scale.
When specific implementation, the embodiment of the present invention can be shot first with filming apparatus for characterizing in display screen
The image of the shooting brightness value of each pixel unit；And brightness Acquisition Instrument is utilized, at least one of acquisition display screen presetted pixel
Intrinsic brilliance value of the brightness value of unit as the pixel unit, and determine presetted pixel unit in the image that shooting obtains
Corresponding shooting brightness value；Then, the ratio between the shooting brightness value of presetted pixel unit and intrinsic brilliance value is calculated, is pressed
Each pixel list is determined one by one using the shooting brightness value of each pixel unit in addition to presetted pixel unit according to same ratio
The intrinsic brilliance value of member；According to the set of the intrinsic brilliance value of each pixel in the display screen under preset gray scale, generate default
Intrinsic brilliance table under grayscale.
Specifically, the embodiment of the present invention can carry out the data acquisition operations of actual displayed brightness first, that is to say, that number
It is to obtain the process of initial data according to acquisition, it is in embodiments of the present invention, general to choose the different grayscale signal layering of 3 to 8 ranks
Processing, other each grayscale can be compensated by the method for software interpolation.For ease of the focusing of camera, positioning, data boundary
Detection, the embodiment of the present invention can make a positioning graph card in advance (with reference to shown in figure 3 (a)).To ensure data accuracy, phase
The resolution of machine is desirable to reach the requirement of panel resolution, for UHD (Ultra High Definition, ultra high-definition) face
Plate, camera CCD (Charge-coupled Device, charge coupling device) resolution will be to 3840 × 2160 or more.
First, actual displayed data are acquired.
The embodiment of the present invention can choose wherein n-layer gray-scale intensity signal, and adjusting camera keeps the parameter values such as light exposure moderate
(data is prevented to be saturated) shoots intrinsic brilliance tables of data D respectively1、D2、…、Dn, luminance meter (such as CA310) is used in combination to record respectively
Different grayscale hypographs center brightness value L1、L2…Ln.The intrinsic brilliance tables of data under highest, minimum brightness is recorded simultaneously
Dmax、DminAnd the center brightness L under highest, minimum brightnessmax、LminNumerical value.
Then, the data of acquisition are normalized.
The first step：According to following formula, all data are converted to difference according to the data of acquisition and true brightness information
Luminance information table.
L(m, n)=K*M(m1, n1)
K=LSurvey brightness value/M(m1, n1) central value
Wherein M is data table matrix, and the size of data that m1, n1 camera obtain, K is brightness transition coefficient.
Second step：Data normalization by m1 × n1 dimensions is m × n dimension datas.
M × n indicates the precision of the tables of data of final process, and more large compensation effect may be thinner, but operation and storage account for
With space bigger, efficiency can be lower.Dimension, the embodiment of the present invention can with the value of m, n can be less than screen resolution, one
As be chosen for screen pixels resolution ratio 1/8 or 1/16 for be described, i.e., (or 16) a pixel is averaged 8 in screen intensity
Brightness is as a sub-pixel.The embodiment of the present invention by taking the liquid crystal display of (3840 × 2160) UHD as an example, such H the directions V number
It is (m, n)=(3840/8,2160/8)=(480,270) according to number.
Then table M (m, n) is normalized, acquires the intrinsic brilliance square of each grayscale signal in accordance with the following methods
Battle array table L(m, n)To get to L' 1 (m, n)、L' 2 (m, n)...L' n (m, n)、L' max (m, n)、L' min (m, n)。
Wherein, L(m, n)For the floating-point array of m rows n row, the brightness value that screen m rows n-th arrange a unit pixel is represented；
M(m, n)For the integer array matrix of m rows n row.
Step 22：According to preset rules, pixel unit that several are in different predeterminated positions is chosen as sampled pixel
Unit；According to the average value of the intrinsic brilliance value of several above-mentioned sampled pixel units, using interpolation algorithm, determine to be used for table
It levies in the upper and lower object brightness table for stating each pixel unit need target brightness value to be achieved of above-mentioned preset gray scale.
When specific implementation, the purpose of establishing target matrix be in order to by Data correction moderate control in certain range
Interior, Data correction crosses conference and carrys out the negative effects such as ghost to picture strip, reduces the expressive force of picture.In order in existing backlight
On the basis of minimize the loss of brightness while improve image quality, reach ideal effect, need in existing module optical design
On the basis of establish data model.
Liquid crystal display die set backlight mode mainly has several at present：1, direct-type backlight, its main feature is that intermediate display area
It is relatively uniform, the brightness peak of central point and non-screen.2, side light emitting type backlight is general that intermediate bright, brightness around is presented
The characteristics of by subtracting.3, single short side backlight, it is possible that side brightness is high, the slightly lower feature of other side brightness.According to the different back ofs the body
The characteristics of light mode, is modeled, and determines that target matrix, method are as follows：
First, lower 9 brightness values of the complete white field state of test, according to backlight mode calculate the average value of each point.
Then, according to 9 determining average values, by software into row interpolation, interpolation algorithm uses Matlab linear interpolations
Yi=interp1 (x, y, xi, ' method'), generation dimension is m × n brightness data tables.
Finally, low-pass filtering is carried out to above-mentioned tables of data, by eliminating high fdrequency component, the luminance information after obtaining smoothly
Table, the tables of data be theoretically brightness uniformity, transitions smooth tables of data, using the tables of data as target matrix LTarget (m, n)。
Step 23：According to the hardware feature of intrinsic brilliance data and object brightness data and camber display screen, ash is generated
Rank correction chart.
Specifically, for any pixel unit in above-mentioned camber display screen, the pixel unit is compared above-mentioned default
Intrinsic brilliance value under grayscale and the diversity factor between target brightness value, according to comparison result and the pixel unit in above-mentioned curved surface
The corresponding gamma curve in residing region in display screen calculates pixel unit grayscale amendment corresponding under above-mentioned preset gray scale
Value.Later, according to corresponding grayscale correction value under the pixel unit each grayscale within a preset range, the pixel list is generated
Grayscale correction chart corresponding to member.
When specific implementation, the above LI (m, n)Reflect display brightness of the liquid crystal display panel at a certain grayscale Gi.Due to original picture
Face there are flaw, make should the good picture of consistency exist and show difference, need to compensate each point one by one, it is therefore an objective to
Eliminate the inhomogeneities etc. of picture brightness, color.
M × n point is shared in this way on screen, there are one measured value (that is, value in intrinsic brilliance table) and one for each point
A ideal desired value (that is, value in object brightness table), is calibrated on the basis of each grayscale signal brightness measured value,
Requirement until meeting desired value, the correction chart of current gray can be obtained by carrying out backwards calculation according to following methods.
Because display panel is strictly to meet Gamma2.2 display characteristics before compensation, according to the brightness of every bit on screen
Maximum LMax (i, j), brightness minimum value LMin (i, j)It can obtain the intrinsic brilliance value L at the point under a certain grayscale GiIt is practical。
LIt is practical=(γ/255) 2.2 × (Lmax-Lmin)+Lmin
Make LIt is practical=LTarget
Under i.e. each grayscale signal, there are following relationship for each point：
γ=exp [ln (LTarget-Lmin)/(2.2*(Lmax-Lmin))+ln255]
After simplification
γ=exp [ln (LTarget)/(2.2*(Lmax)+ln255]
Wherein, the unit of L is cd/m2, γ can carry out carry as needed or cast out, and can be reduced to single byte shaping number
According to.
The Gamma calibration parameter tables Gi for obtaining each putting under a certain grayscale i according to above method(m,n), same method can be with
Generate the calibration data table G of arbitrary multistage picture1、G2...Gn.With n tables of data of generation carry out quadratic interpolation can with arrive institute
There is the calibration value of picture, picture is finally made to reach ideal effect, to solve the problems, such as brightness irregularities.Same colour cast, color
The problems such as spot, can be resolved by R, G, B color separation processing.
Further, for current curved surface liquid crystal module usually as shown in Fig. 3 (b), the part between A points and B points is radius
For the camber line of R, the dotted portion on the left of left side A points and the dotted portion on the right side of right side B points are then straight, therefore entire curved surfaces
All it is not the camber line that radius is R.Therefore compared to flat liquid crystal screen, panel and filter can be led in response to force effect at 2 points in A, B
It is partially bright to further result in the part for having pixel light leakage to generate at A, B for dislocation between mating plate.As shown in Fig. 3 (c), in A and B two
Place has partially bright region vertically, that is, the local colour cast region in camber display screen.
The embodiment of the present invention is directed to the above-mentioned characteristic of curved surface module, in order to eliminate the partially bright phenomenon in part of this regularity,
The embodiment of the present invention is corrected using the method for subregional look-up table.For common plane liquid crystal module, LUT (look-up table)
It is not district location, i.e., exports the numerical value of a corresponding gamma value according to the display data value of input.However, in order to
Solve the problems, such as that curved surface liquid crystal module light leakage embodiment of the present invention at A, B two introduces position change in the data in searching LUT
Amount executes the look-up table that gamma values are r1 in A, two director's bar-shaped zones of B, it is r2's to execute gamma values in remaining position
Look-up table.Since the brightness value at A, B two is partially bright compared with other regions, r1 can be enabled to be more than r2.Specifically, can be in r2
After value debugging, r1 values are determined by display effect or relevant parameter so that the brightness at A, B is reduced to other regions etc.
Same degree.
In embodiments of the present invention, the correction data table Gi (m, n) ultimately generated has following characteristics：
For the look-up table of the i-th grayscale m rows n row, the storage mode of the embodiment of the present invention can be as follows：
For purposes of illustration only, the embodiment of the present invention assumes that look-up table arranges for 5 rows 6, Fig. 4 (a) shows in the prior art 64
The corresponding correction data table of grayscale, Fig. 4 (b) show the corresponding correction data table of 64 grayscale in the embodiment of the present invention.
As it can be seen that for look-up table provided in an embodiment of the present invention, the number in the upper left corner is identical as normal lookup table, when calculating
Restore the grayscale value of first row, the difference in the second row of first row grayscale value=first row the first row+the second row of first row first
Value, and so on.After obtaining the actual grey value of first row, per a line again according to first of each row value on the basis of, in addition poor
The actual gray value of every a line is recovered after value.
Then, generated grayscale correction chart, amendment and display to grayscale signal provided in an embodiment of the present invention are based on
Flow is illustrated.
Fig. 5 shows the amendment of grayscale signal provided in an embodiment of the present invention and the flow diagram of flow for displaying, such as Fig. 5
Shown, which may include：
Step 51：Need according to generated grayscale correction chart to for indicate the grayscale signal of pending picture frame into
When row is corrected, the location information and grayscale value of the pixel unit represented by above-mentioned grayscale signal are repaiied in generated grayscale
In positive table, corresponding grayscale correction value is found.
Specifically, if in above-mentioned grayscale correction chart, the ash corresponding to the grayscale value with the pixel unit is not found
Rank correction value, then：Corresponding with the first grayscale value the first grayscale correction value is searched in above-mentioned grayscale correction chart and with second
The corresponding second grayscale correction value of grayscale value；It is first poor between above-mentioned first grayscale value and above-mentioned second grayscale value to determine
Value and the second difference between above-mentioned first grayscale correction value and above-mentioned second grayscale correction value；Calculate above-mentioned first difference
With the ratio between above-mentioned second difference the grayscale corresponding to the grayscale value with the pixel unit is calculated according to same ratio
Correction value.
Wherein, the value of above-mentioned first grayscale value and the second grayscale value is different.
Step 52：According to the grayscale correction value found, grayscale amendment is carried out to above-mentioned pixel unit, and after exporting amendment
Grayscale signal.
As it can be seen that the embodiment of the present invention has the following advantages that：
First, it is applicable in and has wide range of applications.
The embodiment of the present invention mainly solves the screen defect of the congenital generation of curved surface module, can utilize backlight in maximum program
On the basis of the problems such as solving Mura, blanking bar, local colour cast, color spot.
Second, the selection of tables of data format is convenient.
The measurement acquisition of data in the embodiment of the present invention and intermediate operations data format use Excel (* .xls or *
.cvs) format, intuitively and convenient for carrying out operation and simulation process using Matlab tools.
Third, it is easy to accomplish.
The dependence to high-end professional equipment that the embodiment of the present invention can be reduced effectively, it is easy to accomplish, and to a certain degree
On reduce equipment cost.
It can be seen from the above technical proposal that in embodiments of the present invention, first, obtaining the actual displayed of camber display screen
Brightness；Then, the target display brightness of camber display screen is obtained；Later, according to actual displayed brightness and target display brightness it
Between diversity factor and the camber display screen hardware feature corresponding to gamma curve, determine the ash of the camber display screen
Rank correction value, and then generate the grayscale correction value of the camber display screen.Specifically, for the hardware feature of camber display screen,
Such as bending degree, since the different zones of camber display screen have corresponded to different gamma curves, dimension is determining actual displayed
Brightness, using the corresponding gamma curve of corresponding region, is modified current gray with after the diversity factor of target display brightness,
To obtain the corresponding grayscale correction value of the grayscale, and then each grayscale institute of each pixel unit in generation camber display screen is right
The grayscale correction value answered, to generate the corresponding grayscale correction chart of each pixel unit institute, it is seen then that in the embodiment of the present invention
In grayscale correction chart in contain the pixel unit corresponding grayscale correction value under different grayscale；In this way, working as curved surface
When display screen is shown according to above-mentioned grayscale correction value, capable of eliminating Mura, (Mura, which refers to that brightness of display screen is uneven, to be caused
The phenomenon that various traces), blanking bar, local colour cast, color spot the problems such as, and then improve the uniformity of display screen.
Based on the same technical idea, the embodiment of the present invention additionally provides a kind of life of the grayscale correction chart of camber display screen
At device, Fig. 6 shows a kind of structure of the generating means of the grayscale correction chart of camber display screen provided in an embodiment of the present invention
Schematic diagram, as shown in fig. 6, the device may include：
Intrinsic brilliance determination unit 61 shows same preset gray scale for each pixel unit in camber display screen
When, it determines for being characterized under the preset gray scale, the intrinsic brilliance table of the intrinsic brilliance value of each pixel unit；
Object brightness determination unit 62, for according to preset rules, choosing several pixels for being in different predeterminated positions
Unit is as sampled pixel unit；According to the average value of the intrinsic brilliance value of several sampled pixel units, interpolation is utilized
Algorithm is determined for being characterized under the preset gray scale, the target of each pixel unit need target brightness value to be achieved
Illuminometer；
Computing unit 63, for for any pixel unit in the camber display screen, compare the pixel unit
Intrinsic brilliance value under the preset gray scale and the diversity factor between target brightness value exist according to comparison result and the pixel unit
It is corresponding under the preset gray scale to calculate the pixel unit for the corresponding gamma curve in residing region in the camber display screen
Grayscale correction value；
Generation unit 64, for according to corresponding grayscale amendment under the pixel unit each grayscale within a preset range
Value, generates the grayscale correction chart corresponding to the pixel unit.
Optionally, the intrinsic brilliance determination unit 61 is specifically used for：Using filming apparatus, shoot described for characterizing
The image of the shooting brightness value of each pixel unit in camber display screen；And brightness Acquisition Instrument is utilized, acquire the curved-surface display
Intrinsic brilliance value of the brightness value of at least one of screen presetted pixel unit as the pixel unit, and determine described default
Pixel unit shooting brightness value corresponding in the image that shooting obtains；Calculate the shooting brightness value of the presetted pixel unit
With the ratio between intrinsic brilliance value each pixel unit in addition to the presetted pixel unit is utilized according to same ratio
Brightness value is shot, determines the intrinsic brilliance value of each pixel unit one by one；It is aobvious according to the curved surface under the preset gray scale
The set of the intrinsic brilliance value of each pixel in display screen generates the intrinsic brilliance table under the preset gray scale.
Optionally, the computing unit 63 is specifically used for：It is residing in the camber display screen to obtain the pixel unit
Position；Judge whether the position belongs in the camber display screen the local colour cast region that local colour cast phenomenon occurs, if
It is then to obtain the first gamma curve pre-set and corresponding with the part colour cast region, utilizes first gamma song
Line determines the grayscale correction value of the pixel unit；Otherwise, it obtains pre-set and corresponding with non local colour cast region the
Two gamma curves determine the grayscale correction value of the pixel unit using second gamma curve；Wherein, the local colour cast
Region is determined according to the curved surface bending degree of the camber display screen, and first gamma curve and second gal
Horse curve differs.Since the bending of camber display screen is since stress generates, the curved surface degree of camber display screen can
To reflect the stressing conditions and its bending degree at each position of camber display screen.
Optionally, which further includes：Grayscale amending unit, for after generating the grayscale correction chart, needing
When according to generated grayscale correction chart to for indicating that the grayscale signal of pending picture frame is modified, according to the grayscale
The location information and grayscale value of pixel unit represented by signal find corresponding ash in generated grayscale correction chart
Rank correction value；According to the grayscale correction value found, grayscale amendment is carried out to the pixel unit, and export revised grayscale
Signal.
Optionally, the grayscale amending unit is additionally operable to：In the grayscale correction chart, do not find and the pixel unit
Grayscale value corresponding to grayscale correction value when, corresponding with the first grayscale value the first grayscale is searched in the grayscale correction chart
Correction value and the second grayscale correction value corresponding with the second grayscale value；Determine first grayscale value and second grayscale
The second difference between the first difference and the first grayscale correction value and the second grayscale correction value between value；Meter
The ratio between first difference and second difference is calculated, according to same ratio, calculates the grayscale with the pixel unit
The corresponding grayscale correction value of value；Wherein, the value of first grayscale value and the second grayscale value is different.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices so that
A stream in flow chart can be achieved in the instruction executed by the computer or the processor of other programmable data processing devices
The function of being specified in journey or multiple flows and/or one box of block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in a flow of flow chart or multiple flows and/or block diagram
A box or multiple boxes in specify function the step of.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (8)
1. a kind of generation method of the grayscale correction chart of camber display screen, which is characterized in that this method includes：
When each pixel unit in camber display screen shows same preset gray scale, determine for being characterized in the default ash
Under rank, the intrinsic brilliance table of the intrinsic brilliance value of each pixel unit, specifically,
Using filming apparatus, the figure of the shooting brightness value for characterizing each pixel unit in the camber display screen is shot
Picture；And utilization brightness Acquisition Instrument, the brightness value of at least one of described camber display screen presetted pixel unit is acquired as this
The intrinsic brilliance value of pixel unit, and determine that presetted pixel unit shooting corresponding in the image that shooting obtains is bright
Angle value；
The ratio between the shooting brightness value of the presetted pixel unit and intrinsic brilliance value is calculated, according to same ratio, is utilized
The shooting brightness value of each pixel unit in addition to the presetted pixel unit, determines the intrinsic brilliance of each pixel unit one by one
Value；
According to the set of the intrinsic brilliance value of each pixel in the camber display screen under the preset gray scale, described in generation
Intrinsic brilliance table under preset gray scale；
According to preset rules, pixel unit that several are in different predeterminated positions is chosen as sampled pixel unit；According to institute
The average value for stating the intrinsic brilliance value of several sampled pixel units is determined described pre- for being characterized in using interpolation algorithm
If under grayscale, each pixel unit need the object brightness table of target brightness value to be achieved；
For any pixel unit in the camber display screen, it is bright to compare reality of the pixel unit under the preset gray scale
Diversity factor between angle value and target brightness value, according to comparison result and the pixel unit residing area in the camber display screen
The corresponding gamma curve in domain calculates pixel unit grayscale correction value corresponding under the preset gray scale；
According to corresponding grayscale correction value under each grayscale of the pixel unit within a preset range, the pixel unit institute is generated
Corresponding grayscale correction chart.
2. the method as described in claim 1, which is characterized in that described calculating pixel unit institute under the preset gray scale is right
The grayscale correction value answered, specially：
The pixel unit is obtained the location of in the camber display screen；
Judge whether the position belongs in the camber display screen the local colour cast region that local colour cast phenomenon occurs, if
It is then to obtain the first gamma curve pre-set and corresponding with the part colour cast region, utilizes first gamma song
Line determines the grayscale correction value of the pixel unit；
Otherwise, the second gamma curve pre-set and corresponding with non local colour cast region is obtained, second gamma is utilized
Curve determines the grayscale correction value of the pixel unit；
Wherein, the local colour cast region is determined according to the curved surface bending degree of the camber display screen, and described the
One gamma curve is differed with second gamma curve.
3. the method as described in any one of claim 1-2, which is characterized in that, should after generating the grayscale correction chart
Method further includes：
When needing according to generated grayscale correction chart to for indicating that the grayscale signal of pending picture frame is modified, root
According to the location information and grayscale value of the pixel unit represented by the grayscale signal, in generated grayscale correction chart, search
To corresponding grayscale correction value；
According to the grayscale correction value found, grayscale amendment is carried out to the pixel unit, and export revised grayscale signal.
4. method as claimed in claim 3, which is characterized in that if in the grayscale correction chart, do not find and the picture
Grayscale correction value corresponding to the grayscale value of plain unit, then：
Searched in the grayscale correction chart corresponding with the first grayscale value the first grayscale correction value and with the second grayscale value pair
The the second grayscale correction value answered；
Determine the first difference between first grayscale value and second grayscale value and the first grayscale correction value
With the second difference between the second grayscale correction value；
The ratio between first difference and second difference is calculated, according to same ratio, is calculated and the pixel unit
Grayscale value corresponding to grayscale correction value；
Wherein, the value of first grayscale value and the second grayscale value is different.
5. a kind of generating means of the grayscale correction chart of camber display screen, which is characterized in that the device includes：
Intrinsic brilliance determination unit when showing same preset gray scale for each pixel unit in camber display screen, determines
Go out for being characterized under the preset gray scale, the intrinsic brilliance table of the intrinsic brilliance value of each pixel unit；
The intrinsic brilliance determination unit is specifically used for：
Using filming apparatus, the figure of the shooting brightness value for characterizing each pixel unit in the camber display screen is shot
Picture；And utilization brightness Acquisition Instrument, the brightness value of at least one of described camber display screen presetted pixel unit is acquired as this
The intrinsic brilliance value of pixel unit, and determine that presetted pixel unit shooting corresponding in the image that shooting obtains is bright
Angle value；The ratio between the shooting brightness value of the presetted pixel unit and intrinsic brilliance value is calculated, according to same ratio, is utilized
The shooting brightness value of each pixel unit in addition to the presetted pixel unit, determines the intrinsic brilliance of each pixel unit one by one
Value；According to the set of the intrinsic brilliance value of each pixel in the camber display screen under the preset gray scale, described in generation
Intrinsic brilliance table under preset gray scale；
Object brightness determination unit is made for according to preset rules, choosing the pixel unit that several are in different predeterminated positions
For sampled pixel unit；According to the average value of the intrinsic brilliance value of several sampled pixel units, using interpolation algorithm, really
It makes for being characterized under the preset gray scale, the object brightness table of each pixel unit need target brightness value to be achieved；
Computing unit, for for any pixel unit in the camber display screen, comparing the pixel unit described default
Intrinsic brilliance value under grayscale and the diversity factor between target brightness value, according to comparison result and the pixel unit in the curved surface
The corresponding gamma curve in residing region in display screen calculates pixel unit grayscale amendment corresponding under the preset gray scale
Value；
Generation unit, it is raw for according to corresponding grayscale correction value under the pixel unit each grayscale within a preset range
At the grayscale correction chart corresponding to the pixel unit.
6. device as claimed in claim 5, which is characterized in that the computing unit is specifically used for：
The pixel unit is obtained the location of in the camber display screen；
Judge whether the position belongs in the camber display screen the local colour cast region that local colour cast phenomenon occurs, if
It is then to obtain the first gamma curve pre-set and corresponding with the part colour cast region, utilizes first gamma song
Line determines the grayscale correction value of the pixel unit；
Otherwise, the second gamma curve pre-set and corresponding with non local colour cast region is obtained, second gamma is utilized
Curve determines the grayscale correction value of the pixel unit；
Wherein, the local colour cast region is determined according to the curved surface bending degree of the camber display screen, and described the
One gamma curve is differed with second gamma curve.
7. the device as described in any one of claim 5-6, which is characterized in that the device further includes：
Grayscale amending unit, for after generating the grayscale correction chart, needing according to generated grayscale correction chart pair
When for indicating that the grayscale signal of pending picture frame is modified, the position of the pixel unit represented by the grayscale signal
Confidence ceases and grayscale value finds corresponding grayscale correction value in generated grayscale correction chart；According to the grayscale found
Correction value carries out grayscale amendment to the pixel unit, and exports revised grayscale signal.
8. device as claimed in claim 7, which is characterized in that the grayscale amending unit is additionally operable to：
In the grayscale correction chart, when not finding the grayscale correction value corresponding to the grayscale value with the pixel unit, in institute
It states and is searched in grayscale correction chart and the corresponding first grayscale correction value of the first grayscale value and corresponding with the second grayscale value second
Grayscale correction value；Determine the first difference between first grayscale value and second grayscale value and first ash
The second difference between rank correction value and the second grayscale correction value；It calculates between first difference and second difference
Ratio calculate the grayscale correction value corresponding to the grayscale value with the pixel unit according to same ratio；Wherein, described
The value of one grayscale value and the second grayscale value is different.
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