CN110689811A - Folding screen and color cast correction method thereof - Google Patents

Folding screen and color cast correction method thereof Download PDF

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Publication number
CN110689811A
CN110689811A CN201911085997.4A CN201911085997A CN110689811A CN 110689811 A CN110689811 A CN 110689811A CN 201911085997 A CN201911085997 A CN 201911085997A CN 110689811 A CN110689811 A CN 110689811A
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folding screen
bending angle
bending
tricolor
spring
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CN201911085997.4A
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CN110689811B (en
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李真真
罗晓飞
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0028—Force sensors associated with force applying means

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

The embodiment of the invention provides a folding screen and a color cast correction method thereof, relates to the technical field of display, and can realize real-time detection of the bending angle of the folding screen. A folding screen comprising: the display device comprises a shell and a flexible display panel arranged in the shell; the flexible display panel is provided with a bending area for bending; after the flexible display panel is bent, a bending axis is formed in the bending area; the shell comprises two sub-shells which are respectively positioned at two sides of the bending area; the two sub-shells are connected through a connecting piece; the connecting piece comprises a rotating shaft, and the extending direction of the rotating shaft is the same as the extending direction of the bending axis; the folding screen also comprises a detection device arranged on the shell, and the detection device is used for detecting the bending angle of the folding screen.

Description

Folding screen and color cast correction method thereof
Technical Field
The invention relates to the technical field of display, in particular to a folding screen and a color cast correction method thereof.
Background
At present, most of smart phones are in a 5-to 6-inch vertical plate shape, and are convenient to carry but with an undersized screen; the tablet personal computer is mostly in a vertical plate shape of about 10 inches, and the screen is moderate in size but inconvenient to carry.
Therefore, the folding screen technology well meets the requirements of consumers, and the size of the folded folding screen is the same as that of a conventional mobile phone, so that the folding screen is convenient to carry; after the expansion, a larger display area can be obtained.
Disclosure of Invention
The embodiment of the invention provides a folding screen and a color cast correction method thereof, which can realize the real-time detection of the bending angle of the folding screen.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in one aspect, there is provided a folding screen comprising: the display device comprises a shell and a flexible display panel arranged in the shell; the flexible display panel is provided with a bending area for bending; after the flexible display panel is bent, a bending axis is formed in the bending area; the shell comprises two sub-shells which are respectively positioned at two sides of the bending area; the two sub-shells are connected through a connecting piece; the connecting piece comprises a rotating shaft, and the extending direction of the rotating shaft is the same as the extending direction of the bending axis; the folding screen further comprises a detection device arranged on the shell, and the detection device is used for detecting the bending angle of the folding screen.
Optionally, the detection device comprises a first detection device and a second detection device; the first detection device and the second detection device are respectively arranged on the two sub-shells, and the first detection device and the second detection device are connected with the rotating shaft.
Optionally, the first detection device and the second detection device each comprise a spring and a pressure sensor; the springs are respectively connected with the corresponding pressure sensors and the rotating shaft; the extension direction of the spring is perpendicular to the extension direction of the rotating shaft; the distances from the pressure sensors to the rotating shaft are equal.
Optionally, the first detection device and the second detection device each comprise a spring; the first detection device further comprises a pressure sensor; the spring in the first detection device is connected with the pressure sensor in the first detection device and the rotating shaft; the spring in the second detection device is connected with the sub-shell and the rotating shaft corresponding to the second detection device; the extension direction of the spring is perpendicular to the extension direction of the rotating shaft; the distance from the pressure sensor in the first detection device to the rotating shaft and the distance from the joint of the spring in the second detection device and the corresponding sub-shell to the rotating shaft are equal.
In the folding screen provided by the embodiment of the invention, the flexible display panel arranged in the shell is provided with a bending area for bending, and a bending axis is formed in the bending area after the flexible display panel is bent; the flexible display panel comprises a shell and a plurality of sub-shells, wherein the shell comprises two sub-shells which are respectively positioned at two sides of the bending area, and the two sub-shells are connected through a connecting piece, so that different bending angles can be formed when the relative positions of the two sub-shells are changed; then, through set up detection device on the casing, can realize the angle of buckling of real-time detection folding screen.
In another aspect, a method for obtaining a lookup table of a bending angle and a spring force of a foldable screen is provided, including: simulating the folding screen to obtain a one-to-one correspondence relationship between the bending angle of the folding screen and the displacement variation of the spring; obtaining a one-to-one correspondence relationship between the bending angle of the folding screen and the spring force according to the one-to-one correspondence relationship between the bending angle of the folding screen and the spring displacement variation and the one-to-one correspondence relationship between the spring force and the spring displacement variation; and generating a lookup table about the bending angle of the folding screen and the spring elasticity according to the one-to-one correspondence relationship between the bending angle of the folding screen and the spring elasticity.
In the method for acquiring the lookup table about the bending angle and the spring elasticity of the folding screen provided by the embodiment of the invention, the one-to-one corresponding relation between the bending angle and the spring displacement variation of the folding screen is obtained by simulating the folding screen; and then according to the one-to-one corresponding relation between the spring elasticity and the spring displacement variation, obtaining the one-to-one corresponding relation between the bending angle of the folding screen and the spring elasticity, and further generating a lookup table of the bending angle of the folding screen and the spring elasticity. Therefore, the pressure value of the pressure sensor in the folding screen, namely the spring elasticity is read, the lookup table is searched according to the spring elasticity, and the real-time angle of the folding screen can be simply and effectively obtained.
In another aspect, a method for obtaining a lookup table of a folding angle and a compensation range of luminance of three primary colors of a folding screen is provided, which includes:
under the gray scale N, acquiring a tricolor brightness value corresponding to the folding screen when the bending angle is 0, marking the tricolor brightness value as P, and taking (1-x) P to (1+ x) P as a tricolor reference brightness range; the gray scale range is 0-M, M is 2L-1, 0 < N < M, N and L both being positive integers; (1-x) P > 0; the three primary colors are red, green and blue respectively;
acquiring three-primary-color brightness values corresponding to the folding screen under K bending angles in a bending angle range; k is more than or equal to 2, and the bending angle range is 0-89 degrees;
calculating to obtain a corresponding tricolor brightness compensation range according to the tricolor brightness value corresponding to the folding screen and the tricolor reference brightness range aiming at each of the K bending angles;
for two adjacent bending angles in the K bending angles, performing interpolation operation on the maximum value in the two corresponding three-primary-color brightness compensation ranges, and performing interpolation operation on the minimum value in the two corresponding three-primary-color brightness compensation ranges to calculate the three-primary-color brightness compensation range corresponding to the folding screen at each bending angle between the two adjacent bending angles;
and generating a lookup table about the bending angle of the folding screen and the three-primary-color brightness compensation range according to the corresponding relation between the bending angle of the folding screen and the three-primary-color brightness compensation range aiming at each gray scale.
Optionally, for two adjacent bending angles of the K bending angles, performing interpolation operation on a maximum value in the two corresponding three-primary-color brightness compensation ranges, and simultaneously performing interpolation operation on a minimum value in the two corresponding three-primary-color brightness compensation ranges, and after obtaining a three-primary-color brightness compensation value corresponding to the folding screen at each bending angle between the two adjacent bending angles by calculation, the method for obtaining the lookup table regarding the bending angle of the folding screen and the three-primary-color brightness compensation value further includes:
obtaining a minimum bending angle and a maximum bending angle in the K bending angles;
if the minimum bending angle is not 0, performing interpolation operation on the maximum value in the corresponding tricolor brightness compensation range and the maximum value in the tricolor reference brightness range according to the minimum bending angle and the bending angle 0; performing interpolation operation on the minimum value in the corresponding tricolor brightness compensation range and the minimum value in the tricolor reference brightness range, and calculating to obtain the tricolor brightness compensation range corresponding to the folding screen under each bending angle of which the bending angle is between 0 and the minimum bending angle;
if the maximum bending angle is smaller than 89, acquiring a three-primary-color brightness value corresponding to the folding screen when the bending angle is 89; calculating to obtain a corresponding tricolor brightness compensation range according to the tricolor brightness value corresponding to the bending angle 89 and the tricolor reference brightness range;
performing interpolation operation on the maximum value in the corresponding two groups of tricolor brightness compensation ranges according to the maximum bending angle and the bending angle 89; and simultaneously carrying out interpolation operation on the minimum value in the two groups of three-primary-color brightness compensation ranges, and calculating to obtain the three-primary-color brightness compensation range corresponding to the folding screen under each bending angle between the maximum bending angle and the bending angle 89.
The embodiment of the invention provides a method for acquiring a lookup table about a folding angle of a folding screen and a tricolor brightness compensation range, wherein a tricolor brightness value corresponding to the folding screen when the folding angle is 0 is acquired and is marked as P, and (1-x) P to (1+ x) P are taken as a tricolor reference brightness range; then obtaining three-primary-color brightness values corresponding to the K bending angles, and calculating to obtain K three-primary-color brightness compensation ranges according to the three-primary-color brightness values corresponding to the K bending angles and the three-primary-color reference brightness range; and then carrying out interpolation operation on the maximum value and the minimum value in two groups of three-primary-color brightness compensation ranges corresponding to two adjacent bending angles in the K bending angles, and calculating to obtain the three-primary-color brightness compensation range corresponding to the folding screen under each bending angle, so as to generate a lookup table about the bending angle of the folding screen and the three-primary-color brightness compensation range, and further in the subsequent process, quickly and efficiently searching to obtain the three-primary-color brightness compensation range corresponding to each bending angle according to the lookup table and carrying out compensation.
In another aspect, a method for correcting color shift of a folding screen is provided, including:
under the gray scale S, acquiring a pressure value of a pressure sensor in the folding screen to be corrected as corresponding spring force; the gray scale range is 0-M, M is 2L-1, 0 < S < M, S and L both being positive integers;
searching a lookup table obtained by an obtaining method of the lookup table about the bending angle of the folding screen and the spring elasticity to obtain the bending angle corresponding to the spring elasticity;
aiming at the gray scale S, searching a lookup table obtained by an obtaining method of the lookup table about the bending angle of the folding screen and the tricolor brightness compensation range according to the bending angle of the folding screen to be corrected to obtain the tricolor brightness compensation range corresponding to the folding screen to be corrected;
and compensating the tricolor brightness of the folding screen to be corrected according to the tricolor brightness compensation range.
Optionally, after obtaining the bending angle corresponding to the elastic force of the spring, before obtaining the three-primary-color brightness compensation value corresponding to the folded screen to be corrected, the method for correcting color shift of the folded screen further includes:
judging whether the bending angle of the folding screen to be corrected is larger than a preset angle threshold value or not;
if not, no compensation is carried out;
if so, searching the lookup table obtained by the method for obtaining the lookup table about the folding angle of the folding screen and the tricolor brightness compensation range according to the folding angle of the folding screen to be corrected, and obtaining the tricolor brightness compensation range corresponding to the folding screen to be corrected.
The embodiment of the invention also provides a color cast correction method of the folding screen, which comprises the steps of obtaining the pressure value of the pressure sensor in the folding screen to be corrected as the corresponding spring force; then, searching a lookup table obtained by the method for obtaining the lookup table of the bending angle and the spring elasticity of the folding screen to obtain the bending angle corresponding to the spring elasticity; then according to the bending angle, searching a lookup table obtained by a method for obtaining a lookup target about the bending angle of the folding screen and the tricolor brightness compensation range to obtain the tricolor brightness compensation range corresponding to the folding screen to be corrected; therefore, the tricolor brightness of the folding screen to be corrected can be compensated according to the tricolor brightness compensation range, and real-time correction is realized.
In yet another aspect, a computer device is provided that includes a storage unit and a processing unit; the storage unit stores therein a computer program executable on the processing unit and stores the result; the processing unit implements the method for obtaining the lookup table of the folding angle and the spring force of the folding screen as described above, and/or the method for obtaining the lookup table of the folding angle and the compensation range of the brightness of the three primary colors as described above, and/or the method for correcting the color cast of the folding screen as described above when executing the computer program.
In still another aspect, a computer readable medium is provided, which stores a computer program, which when executed by a processor implements the method for obtaining the lookup table regarding the bending angle and the spring force of the folding screen as described above, and/or the method for obtaining the lookup table regarding the bending angle and the compensation range of the three primary color luminance as described above, and/or the method for correcting the color shift of the folding screen as described above.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic top view of a foldable screen according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line AA' of FIG. 1;
FIG. 3 is another schematic cross-sectional view taken along line AA' of FIG. 1;
FIG. 4a is a schematic cross-sectional view taken along line AA' of FIG. 1;
FIG. 4b is a schematic view of the bending of the sheet of paper on the basis of FIG. 4 a;
FIG. 5a is a schematic cross-sectional view taken along line AA' of FIG. 1;
FIG. 5b is a schematic view of the bending of the sheet of FIG. 5 a;
fig. 6 is a schematic flowchart of a method for obtaining a lookup table of a bending angle and a spring force of a foldable screen according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a method for obtaining a lookup table of a bending angle and a compensation range of three primary color luminance of a folding screen according to an embodiment of the present invention;
fig. 8 is a schematic flowchart of a method for obtaining a lookup table of a bending angle and a compensation range of three primary colors of a foldable screen according to another embodiment of the present invention;
fig. 9 is a schematic flowchart of a color shift correction method for a foldable screen according to an embodiment of the present invention;
fig. 10 is a schematic flowchart of another color shift correction method for a folding screen according to an embodiment of the present invention.
Reference numerals:
1-folding the screen; 10-a housing; 11-a sub-shell; 20-a flexible display panel; 30-a connector; 31-a rotating shaft; 40-a detection device; 41-first detection means; 42-a second detection device; 50-a spring; 60-a pressure sensor; 100-bending zone.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a folding screen 1, as shown in fig. 1 and 2, including: a housing 10, a flexible display panel 20 disposed in the housing 10.
Taking the light emitting direction of the flexible display panel 20 as top light emitting as an example, the housing 10 may be a U-shaped housing, and the flexible display panel 20 is disposed in the housing 10.
The above-described housing 10 serves to protect and support the flexible display panel 20.
The flexible display panel 20 may be, for example, an Organic Light Emitting Diode (OLED) display panel, a Micro Light Emitting Diode (Micro LED) display panel, or a Quantum Dot Light Emitting Diode (QLED) display panel.
The flexible display panel 20 has a bending region 100 for bending; the flexible display panel 20 is bent to form a bending axis (indicated by a dotted line P in fig. 1) in the bending region 100.
The housing 10 includes two sub-housings 11, and the two sub-housings 11 are respectively located at two sides of the bending region 100.
The two sub-housings 11 are connected by a connecting piece 30; the connecting member 30 includes a rotating shaft 31, and the extending direction of the rotating shaft 31 is the same as the extending direction of the bending axis P.
The folding screen 1 further comprises a detection device 40 arranged on the housing 10, and the detection device 40 is used for detecting the bending angle of the folding screen 1.
The bending angle of the folding screen 1, that is, the bending angle of the flexible display panel 20.
In the foldable screen 1 provided by the embodiment of the present invention, the flexible display panel 20 disposed in the housing 10 has a bending region 100 for bending, and after the flexible display panel 20 is bent, a bending axis is formed in the bending region 100; by arranging the housing 10 to include two sub-housings 11, the two sub-housings 11 are respectively located at two sides of the bending region 100, and the two sub-housings 11 are connected by the connecting member 30, the flexible display panel 20 can form different bending angles when the relative positions of the two sub-housings 11 change; then, by providing the detection device 40 on the housing 10, it is possible to detect the bending angle of the folding screen 1 in real time.
Alternatively, as shown in fig. 3, the detection device 40 includes a first detection device 41 and a second detection device 42.
The first detection device 41 and the second detection device 42 are respectively disposed on the two sub-housings 11, and the first detection device 41 and the second detection device 42 are both connected to the rotation shaft 31.
It can be understood that, during the process of bending the flexible display panel 20, the two sub-housings 11 and the rotating shaft 31 slide relatively; the positions of the two sub-housings 11 with respect to the rotation shaft 31 are changed, and the positions of the first detection device 41 and the second detection device 42 are changed with the sub-housings 11 corresponding to each.
Alternatively, as shown in fig. 4a and 4b, the first detection device 41 and the second detection device 42 each include a spring 50 and a pressure sensor 60.
The springs 50 are respectively connected to the corresponding pressure sensors 60 and the rotating shaft 31. That is, the spring 50 in the first detection device 41 connects the pressure sensor 60 in the first detection device 41 and the rotating shaft 31; the spring 50 in the second detection device 42 connects the pressure sensor 60 in the second detection device 42 with the rotary shaft 31.
Wherein the extension and contraction direction of the spring 50 (e.g. M in FIGS. 4a and 4 b)1And M2The indicated direction) are mutually perpendicular to the extending direction of the rotating shaft 31.
The distances from the pressure sensors 60 to the rotating shaft 31 are all equal. That is, the distance from the pressure sensor 60 in the first detection device 41 to the rotation shaft 31 is equal to the distance from the pressure sensor 60 in the first detection device 41 to the rotation shaft 31.
It should be noted that, as shown in fig. 4a, when the flexible display panel 20 is flat, that is, when the bending angle is 0 degree, the springs 50 in the first detection device 41 and the second detection device 42 are in a compressed state, and at this time, the springs 50 in the first detection device 41 generate a direction M to the corresponding sub-housing 11aThe directional thrust, the spring 50 in the second detecting device 42, will generate a direction M to the corresponding sub-housing 11bThe directional pushing force, thereby, the flatness of the flexible display panel 20 can be ensured.
As shown in fig. 4b, when the flexible display panel 20 is bent, since one end of the spring 50 in the first detection device 41 is fixed on the pressure sensor 60 and the other end is fixed on the rotation shaft 31, the spring 50 will be compressed along with the bending of the flexible display panel 20, and at this time, the displacement variation of the spring 50 is consistent with the displacement of the corresponding physical center of the sub-housing 11; further, when the amount of displacement of the physical center of the sub-housing 11 is different depending on the bending angle, the amount of displacement change of the spring 50 is different.
Similarly, one end of the spring 50 in the second detection device 42 is fixed on the pressure sensor 60, and the other end is fixed on the rotation shaft 31, and the spring 50 in the second detection device 42 will be compressed along with the bending of the flexible display panel 20, at this time, the displacement variation of the spring 50 is consistent with the displacement of the physical center of the corresponding sub-housing 11; further, when the amount of displacement of the physical center of the sub-housing 11 is different depending on the bending angle, the amount of displacement change of the spring 50 is different.
When the structures and the performances of the springs 50 in the first detection device 41 and the second detection device 42 are the same, and the distances from the pressure sensor 60 to the rotating shaft 31 are the same, the displacement variation of the springs 50 in the first detection device 41 and the second detection device 42 is the same corresponding to any bending angle of the flexible display panel 20, and the pressure values measured by the pressure sensor 60 are the same.
The spring 50 may be connected to the pressure sensor 60 and the rotating shaft 31 by welding or by snapping, but may be connected to the pressure sensor by other methods, which is not limited in the present invention.
Alternatively, as shown in fig. 5a and 5b, the first detection device 41 and the second detection device 42 each comprise a spring 50; the first detection device 41 further comprises a pressure sensor 60.
The spring 50 in the first detection device 41 connects the pressure sensor 60 in the first detection device 41 and the rotating shaft 31.
The spring 50 in the second detection device 42 connects the sub-housing 11 corresponding to the second detection device 42 with the rotation shaft 31.
Wherein the extension and contraction direction of the spring 50 (N in FIGS. 5a and 5 b)1And N2The indicated direction) are mutually perpendicular to the extending direction of the rotating shaft 31.
The distance from the pressure sensor 60 in the first detection device 41 to the rotating shaft 31 and the distance from the connection point of the spring 50 in the second detection device 42 and the corresponding sub-housing 11 to the rotating shaft 31 are equal.
It should be noted that, as shown in fig. 5a, when the flexible display panel 20 is flat, that is, when the bending angle is 0 degree, the springs 50 in the first detection device 41 and the second detection device 42 are in a compressed state, and at this time, the springs 50 in the first detection device 41 generate an action toward the sub-housing 11 corresponding to the sub-housing NaThe directional pushing force, the spring 50 in the second detecting device 42, will generate a direction N to the corresponding sub-housing 11bThe directional pushing force, thereby, the flatness of the flexible display panel 20 can be ensured.
As shown in fig. 5b, when the flexible display panel 20 is bent, since one end of the spring 50 in the first detection device 41 is fixed on the pressure sensor 60 and the other end is fixed on the rotation shaft 31, the spring 50 will be compressed along with the bending of the flexible display panel 20, and at this time, the displacement variation of the spring 50 is consistent with the displacement of the corresponding physical center of the sub-housing 11; further, when the amount of displacement of the physical center of the sub-housing 11 is different depending on the bending angle, the amount of displacement change of the spring 50 is different.
Similarly, one end of the spring 50 in the second detection device 42 is fixed on the corresponding sub-housing 11, and the other end is fixed on the rotation shaft 31, and the spring 50 in the second detection device 42 will also be compressed along with the bending of the flexible display panel 20, at this time, the displacement variation of the spring 50 is consistent with the displacement of the physical center of the corresponding sub-housing 11; further, when the amount of displacement of the physical center of the sub-housing 11 is different depending on the bending angle, the amount of displacement change of the spring 50 is different.
When the springs 50 in the first detecting device 41 and the second detecting device 42 have the same structure, performance, and the like, and the distance from the pressure sensor 60 in the first detecting device 41 to the rotating shaft 31 and the distance from the joint of the spring 50 in the second detecting device 42 and the corresponding sub-housing 11 to the rotating shaft 31 are the same, the displacement variation of the spring 50 in the first detecting device 41 and the second detecting device 42 is the same corresponding to any bending angle of the flexible display panel 20.
The embodiment of the present invention further provides a method for obtaining a lookup table about a bending angle and a spring force of a foldable screen, as shown in fig. 6, including:
s1, as shown in fig. 1-5 b, performing simulation on the above-mentioned foldable screen 1 to obtain a one-to-one correspondence relationship between the bending angle of the foldable screen 1 and the displacement variation of the spring.
It should be noted that the spring displacement variation is the displacement variation of the spring 50 in the first detection device 41 in the folding screen 1, or the displacement variation of the spring 50 in the second detection device 42.
For example, for simulation of a folding screen, the length of a corresponding spring is taken as a reference (i.e., the displacement variation of the corresponding spring is 0mm) when the bending angle of the folding screen is 0 degree (i.e., when the folding screen is unfolded); when the bending angle of the folding screen is 40 degrees, the corresponding spring displacement variation is 0.3 mm; when the bending angle of the folding screen is 90 degrees (i.e., when folded in half), the corresponding spring displacement variation is 1.1 mm.
S2, obtaining the one-to-one correspondence relationship between the bending angle of the folding screen and the spring force according to the one-to-one correspondence relationship between the bending angle of the folding screen and the spring displacement variation and the one-to-one correspondence relationship between the spring force and the spring displacement variation.
The one-to-one correspondence of spring force to spring displacement variation refers to: when the spring is elastically deformed, the magnitude of the elastic force is proportional to the length of the spring (i.e., the amount of change in spring displacement) to be extended (or shortened) within the elastic limit, i.e., F ═ kx.
Wherein F is the spring force, k is the elastic coefficient, and x is the spring displacement variation.
And S3, generating a lookup table about the bending angle and the spring force of the folding screen according to the one-to-one correspondence relationship between the bending angle and the spring force of the folding screen.
The embodiment of the invention also provides a method for acquiring the lookup table of the bending angle and the spring elasticity of the folding screen, which is used for acquiring the one-to-one corresponding relation between the bending angle and the spring displacement variation of the folding screen through simulation on the folding screen; and then according to the one-to-one corresponding relation between the spring elasticity and the spring displacement variation, obtaining the one-to-one corresponding relation between the bending angle of the folding screen and the spring elasticity, and further generating a lookup table of the bending angle of the folding screen and the spring elasticity. Therefore, the pressure value of the pressure sensor in the folding screen, namely the spring elasticity is read, the lookup table is searched according to the spring elasticity, and the real-time angle of the folding screen can be simply and effectively obtained.
On the basis, when the folding screen is at a different bending angle, different color cast phenomena are usually generated, and the display effect is influenced.
Based on the above problem, an embodiment of the present invention further provides a method for obtaining a lookup table regarding a bending angle and a compensation range of luminance of three primary colors of a folded screen, as shown in fig. 7, including:
s10, under the gray scale N, acquiring the three-primary-color brightness value corresponding to the folding screen when the folding angle is 0 (i.e. when the folding screen is unfolded), and marking the three-primary-color brightness value as P, and taking (1-x) P to (1+ x) P as the reference brightness range of the three primary colors. Wherein, the gray scale range is 0-M, M is 2L-1, 0 < N < M, N and L being positive integers, and (1-x) P > 0. The three primary colors are red, green and blue, respectively.
It should be noted that the gray scale range depends on the number of bits of data transmission in the folded screen. If the number of bits of the data transmission is 6, then L equals 6 and M equals 26-1 is 63, the gray scale range is 0-63, and N is more than 0 and less than 63; if the number of bits of the data transmission is 8, L is 8, and M is 28-1 is 255, the gray scale range is 0-255, and then 0 < N < 255; if the number of bits of the data transmission is 10, L is 10, and M is 2101023, the gray scale range is 0-1023, and 0 < N < 1023.
Here, x may be set as needed, and the present invention is not limited thereto.
Illustratively, under the gray scale of 100, the three-primary-color brightness value P corresponding to the folding screen when the folding angle is 0 is obtained as (100,100,100); if x is set to 0.05, the red luminance reference range is (95,105); the green luminance reference range is (95,105); the blue luminance reference range is (95,105).
And S20, acquiring the brightness values of the three primary colors corresponding to the folded screen under K bending angles in the bending angle range. K is more than or equal to 2, and the bending angle range is 0-89 degrees.
It should be noted that although the folding screen can be bent to 90 degrees, the viewer cannot receive the spectrum when the folding screen is folded in half, compared with the viewer whose sight line is perpendicular to the folding screen in a state where the folding screen is unfolded. The display screen is not visible, and therefore, it can be considered that the color shift phenomenon does not occur when the folding screen is bent to 90 degrees.
And S30, calculating to obtain a corresponding tricolor brightness compensation range according to the tricolor brightness value and the tricolor reference brightness range corresponding to the folding screen aiming at each of the K bending angles.
Illustratively, according to the example of S10, the folding screen has a luminance value P of three primary colors of (100,100,100) when the folding angle is 0; and if the preset x is 0.05, the reference range of the three primary color brightness is 95-105.
Based on this, the three-primary-color brightness values corresponding to the 5 bending angles (5 degrees, 25 degrees, 45 degrees, 65 degrees and 85 degrees respectively) in the bending angle range of the folding screen are obtained. For example, when the bending angle is 10 degrees, the corresponding three primary color brightness values are respectively (120,100,110), and then the corresponding three primary color brightness compensation range is calculated to be (-25 to-15, -5 to 5, -15 to 5) according to the three primary color brightness values and the three primary color reference brightness range; when the bending angle is 20 degrees, the corresponding three primary color brightness values are respectively (140,110,100), and then the corresponding three primary color brightness compensation range is calculated to be (-55 to-35, -15 to 5, -5 to 5) according to the three primary color brightness values and the three primary color reference brightness range.
And S40, performing interpolation operation on the maximum values of the two corresponding three-primary-color brightness compensation ranges according to two adjacent bending angles in the K bending angles, performing interpolation budget on the minimum values of the two three-primary-color brightness compensation ranges, and calculating to obtain the three-primary-color brightness compensation range corresponding to the folding screen at each bending angle between the two adjacent bending angles.
It should be noted that, interpolation operation is performed on the maximum values of the two sets of red brightness compensation ranges corresponding to two adjacent bending angles in the K bending angles, and interpolation operation is performed on the minimum values of the two sets of red brightness compensation ranges at the same time, so as to calculate the red brightness compensation range corresponding to the folding screen at each bending angle between the two adjacent bending angles.
And performing interpolation operation on the maximum values of the two groups of green brightness compensation ranges corresponding to two adjacent bending angles in the K bending angles, and performing interpolation operation on the minimum values of the two groups of green brightness compensation ranges to calculate the green brightness compensation range corresponding to the folding screen at each bending angle between the two adjacent bending angles.
And performing interpolation operation on the maximum values of the two groups of blue brightness compensation ranges corresponding to two adjacent bending angles in the K bending angles, and performing interpolation operation on the minimum values of the two groups of blue brightness compensation ranges to calculate the blue brightness compensation range corresponding to the folding screen at each bending angle between the two adjacent bending angles.
Illustratively, according to the example in S30 described above, the maximum value of the two sets of red luminance compensation ranges (-25 to-15 and-55 to-35) corresponding to the 5 degree and 25 degree bend angles is interpolated, i.e., the interpolation is performed on-15 and-35; simultaneously, performing interpolation operation on the minimum value in the two groups of red brightness compensation ranges, namely performing interpolation operation on-25 and-55; therefore, the red brightness compensation range corresponding to the folding screen under each bending angle is obtained by calculation from 5 degrees to 25 degrees.
Similarly, carrying out interpolation operation on the maximum values of two groups of green brightness compensation ranges (-5 and-15-5) corresponding to the bending angles of 10 degrees and 20 degrees, namely carrying out interpolation operation on 5 and 5; simultaneously, carrying out interpolation operation on the minimum value in the two groups of green brightness compensation ranges, namely carrying out interpolation operation on-5 and-15; therefore, the compensation range of the green brightness corresponding to the folding screen under each bending angle is calculated to be 10-20 degrees.
Similarly, carrying out interpolation operation on the maximum values of two groups of blue brightness compensation ranges (-15-5 and-5) corresponding to the bending angles of 10 degrees and 20 degrees, namely carrying out interpolation operation on 5 and 5; simultaneously, performing interpolation operation on the minimum value in the two groups of blue brightness compensation ranges, namely performing interpolation operation on-15 and-5; therefore, the blue brightness compensation range corresponding to the folding screen under each bending angle is calculated to be 10-20 degrees.
Therefore, the three-primary-color brightness compensation range corresponding to the folded screen under each bending angle is obtained, wherein the bending angle is between 10 and 20 degrees.
And S50, generating a lookup table about the folding angle of the folding screen and the compensation range of the three primary colors according to the corresponding relation between the folding angle of the folding screen and the compensation range of the three primary colors for each gray scale.
The embodiment of the invention provides a method for acquiring a lookup table about a folding angle of a folding screen and a tricolor brightness compensation range, wherein a tricolor brightness value corresponding to the folding screen when the folding angle is 0 is acquired and is marked as P, and (1-x) P to (1+ x) P are taken as a tricolor reference brightness range; then obtaining three-primary-color brightness values corresponding to the K bending angles, and calculating to obtain K three-primary-color brightness compensation ranges according to the three-primary-color brightness values corresponding to the K bending angles and the three-primary-color reference brightness range; and then carrying out interpolation operation on the maximum value and the minimum value in two groups of three-primary-color brightness compensation ranges corresponding to two adjacent bending angles in the K bending angles, and calculating to obtain the three-primary-color brightness compensation range corresponding to the folding screen under each bending angle, so as to generate a lookup table about the bending angle of the folding screen and the three-primary-color brightness compensation range, and further in the subsequent process, quickly and efficiently searching to obtain the three-primary-color brightness compensation range corresponding to each bending angle according to the lookup table and carrying out compensation.
Optionally, after S50, as shown in fig. 8, the method for obtaining the lookup table of the folding angle of the folding screen and the compensation range of the three primary color luminance further includes:
and S60, acquiring the minimum bending angle and the maximum bending angle in the K bending angles.
S70, if the minimum bending angle is not 0, carrying out interpolation operation on the maximum value in the corresponding tricolor brightness compensation range and the maximum value in the tricolor reference brightness range according to the minimum bending angle and the bending angle 0; and simultaneously carrying out interpolation operation on the minimum value in the corresponding tricolor brightness compensation range and the minimum value in the tricolor reference brightness range, and calculating to obtain the tricolor brightness compensation range corresponding to the folding screen under each bending angle between the bending angle 0 and the minimum bending angle.
S80, if the maximum bending angle is smaller than 89, acquiring the three-primary-color brightness value corresponding to the folding screen when the bending angle is 89; and calculating to obtain a corresponding tricolor brightness compensation range according to the tricolor brightness value corresponding to the bending angle 89 and the tricolor reference brightness range.
S90, carrying out interpolation operation on the maximum value in the corresponding two groups of three-primary-color brightness compensation ranges according to the maximum bending angle and the bending angle 89; and simultaneously, carrying out interpolation operation on the minimum value in the two groups of three-primary-color brightness compensation ranges, and calculating to obtain the three-primary-color brightness compensation range corresponding to the folding screen under each bending angle between the maximum bending angle and the bending angle 89.
Illustratively, according to the example in S40 described above, of the acquired 5 bending angles, the minimum bending angle is 5 degrees, and the maximum bending angle is 85 degrees.
At this time, when the folding screen is bent by 5 degrees according to 0 degree and 5 degrees, the maximum value in the corresponding three-primary-color brightness range and the maximum value in the three-primary-color reference brightness compensation range are subjected to interpolation operation, and the three-primary-color brightness compensation range corresponding to each degree in 0-5 degrees is obtained through calculation.
The maximum bending angle is 85 degrees and less than 89 degrees, so that, firstly, the brightness value of the three primary colors corresponding to the folding screen with the bending angle of 89 degrees is obtained, for example, (40,60, 50); and calculating to obtain a corresponding tricolor brightness compensation range (55-65, 35-45 and 45-55) according to the tricolor brightness value and the tricolor reference brightness range.
Then, carrying out interpolation operation on the maximum value in the two corresponding groups of red brightness compensation ranges according to the bending angle of 85 degrees and the bending angle of 89 degrees; and simultaneously, carrying out interpolation operation on the minimum value in the two groups of red brightness compensation ranges, and calculating to obtain the red brightness compensation range corresponding to the folding screen under each bending angle between the maximum bending angle 85 and the bending angle 89.
Similarly, carrying out interpolation operation on the maximum value in the two corresponding groups of green brightness compensation ranges; and simultaneously, carrying out interpolation operation on the minimum value in the two groups of green brightness compensation ranges, and calculating to obtain the green brightness compensation range corresponding to the folding screen under each bending angle between the maximum bending angle 85 and the bending angle 89.
In the same way, the maximum value in the two groups of corresponding blue brightness compensation ranges is subjected to interpolation operation; and simultaneously, carrying out interpolation operation on the minimum value in the two groups of blue brightness compensation ranges, and calculating to obtain the blue brightness compensation range corresponding to the folding screen under each bending angle between the maximum bending angle 85 and the bending angle 89.
An embodiment of the present invention further provides a color shift correction method for a folding screen as described above, as shown in fig. 9, including:
s100, under the gray scale S, acquiring a pressure value of a pressure sensor in the folding screen to be corrected as corresponding spring elasticity. The gray scale range is 0-M, M is 2L-1, 0 < S < M, S and L being positive integers.
S200, searching the lookup table obtained by the method for obtaining the lookup table of the bending angle and the spring elasticity of the folding screen to obtain the bending angle corresponding to the spring elasticity.
S300, aiming at the gray scale S, searching a lookup table obtained by an obtaining method of the lookup table about the bending angle of the folding screen and the tricolor brightness compensation range according to the bending angle of the folding screen to be corrected, and obtaining the tricolor brightness compensation range corresponding to the folding screen to be corrected.
S400, compensating the tricolor brightness of the folding screen to be corrected according to the tricolor brightness compensation range.
It should be noted that, if the compensation value in the compensation range of the three primary color brightness is a positive number, it indicates that the brightness corresponding to the folding screen is dark, and at this time, the brightness needs to be increased; if the compensation value in the compensation range of the three primary colors is negative, it indicates that the brightness corresponding to the folding screen is slightly bright, and at this time, the brightness needs to be reduced.
Based on the above, when compensation is performed on the tricolor brightness of the folding screen to be corrected under a plurality of bending angles, the compensation can be performed according to the maximum value in the compensation ranges of the tricolor brightness; or compensating according to the minimum value in the luminance compensation ranges of the three primary colors respectively corresponding to the luminance compensation ranges; or compensating according to the intermediate values in the three primary color brightness compensation ranges respectively corresponding to the three primary colors; so that the compensated brightness is more uniform.
The embodiment of the invention also provides a color cast correction method of the folding screen, which comprises the steps of obtaining the pressure value of the pressure sensor in the folding screen to be corrected as the corresponding spring force; then, searching a lookup table obtained by the method for obtaining the lookup table of the bending angle and the spring elasticity of the folding screen to obtain the bending angle corresponding to the spring elasticity; then according to the bending angle, searching a lookup table obtained by a method for obtaining a lookup target about the bending angle of the folding screen and the tricolor brightness compensation range to obtain the tricolor brightness compensation range corresponding to the folding screen to be corrected; therefore, the tricolor brightness of the folding screen to be corrected can be compensated according to the tricolor brightness compensation range, and real-time correction is realized.
Optionally, after S200 and before S300, as shown in fig. 10, the method for correcting color shift of a folded screen further includes:
s210, judging whether the bending angle of the folding screen to be corrected is larger than a preset angle threshold value.
And S220, if not, not performing compensation.
And S230, if so, searching the lookup table obtained by the method for obtaining the lookup table about the folding angle of the folding screen and the tricolor brightness compensation range according to the folding angle of the folding screen to be corrected, and obtaining the tricolor brightness compensation range corresponding to the folding screen to be corrected.
The embodiment of the invention also provides computer equipment, which comprises a storage unit and a processing unit; a storage unit in which a computer program executable on the processing unit is stored and the result is stored; the processing unit, when executing the computer program, implements the method for obtaining the lookup table regarding the bending angle and the spring force of the folding screen as described above, and/or the method for obtaining the lookup table regarding the bending angle and the compensation range of the three primary colors brightness as described above, and/or the method for correcting the color shift of the folding screen as described above.
Embodiments of the present invention also provide a computer readable medium storing a computer program, which when executed by a processor implements the method for obtaining the lookup table regarding the bending angle and the spring force of the folding screen as described above, and/or the method for obtaining the lookup table regarding the bending angle and the compensation range of the three primary color luminance as described above, and/or the method for correcting the color shift of the folding screen as described above.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (11)

1. A folding screen, comprising: the display device comprises a shell and a flexible display panel arranged in the shell;
the flexible display panel is provided with a bending area for bending; after the flexible display panel is bent, a bending axis is formed in the bending area;
the shell comprises two sub-shells which are respectively positioned at two sides of the bending area;
the two sub-shells are connected through a connecting piece; the connecting piece comprises a rotating shaft, and the extending direction of the rotating shaft is the same as the extending direction of the bending axis;
the folding screen further comprises a detection device arranged on the shell, and the detection device is used for detecting the bending angle of the folding screen.
2. A folding screen as claimed in claim 1 wherein the sensing means comprises first sensing means and second sensing means;
the first detection device and the second detection device are respectively arranged on the two sub-shells, and the first detection device and the second detection device are connected with the rotating shaft.
3. A folding screen as claimed in claim 2 wherein the first and second detection means each comprise a spring and a pressure sensor;
the springs are respectively connected with the corresponding pressure sensors and the rotating shaft;
the extension direction of the spring is perpendicular to the extension direction of the rotating shaft; the distances from the pressure sensors to the rotating shaft are equal.
4. A folding screen as claimed in claim 2 wherein the first and second detection means each comprise a spring; the first detection device further comprises a pressure sensor;
the spring in the first detection device is connected with the pressure sensor in the first detection device and the rotating shaft;
the spring in the second detection device is connected with the sub-shell and the rotating shaft corresponding to the second detection device;
the extension direction of the spring is perpendicular to the extension direction of the rotating shaft; the distance from the pressure sensor in the first detection device to the rotating shaft and the distance from the joint of the spring in the second detection device and the corresponding sub-shell to the rotating shaft are equal.
5. A method for obtaining a lookup table about bending angles and spring forces of a folding screen is characterized by comprising the following steps:
simulating the folding screen to obtain a one-to-one correspondence relationship between the bending angle of the folding screen and the displacement variation of the spring;
obtaining a one-to-one correspondence relationship between the bending angle of the folding screen and the spring force according to the one-to-one correspondence relationship between the bending angle of the folding screen and the spring displacement variation and the one-to-one correspondence relationship between the spring force and the spring displacement variation;
and generating a lookup table about the bending angle of the folding screen and the spring elasticity according to the one-to-one correspondence relationship between the bending angle of the folding screen and the spring elasticity.
6. A method for obtaining a lookup table of a folding screen bending angle and a tricolor brightness compensation range is characterized by comprising the following steps:
under the gray scale N, acquiring a tricolor brightness value corresponding to the folding screen when the bending angle is 0, marking the tricolor brightness value as P, and taking (1-x) P to (1+ x) P as a tricolor reference brightness range; the gray scale range is 0-M, M is 2L-1, 0 < N < M, N and L both being positive integers; (1-x) P > 0; the three primary colors are red, green and blue respectively;
acquiring three-primary-color brightness values corresponding to the folding screen under K bending angles in a bending angle range; k is more than or equal to 2, and the bending angle range is 0-89 degrees;
calculating to obtain a corresponding tricolor brightness compensation range according to the tricolor brightness value corresponding to the folding screen and the tricolor reference brightness range aiming at each of the K bending angles;
for two adjacent bending angles in the K bending angles, performing interpolation operation on the maximum value in the two corresponding three-primary-color brightness compensation ranges, and performing interpolation operation on the minimum value in the two corresponding three-primary-color brightness compensation ranges to calculate the three-primary-color brightness compensation range corresponding to the folding screen at each bending angle between the two adjacent bending angles;
and generating a lookup table about the bending angle of the folding screen and the three-primary-color brightness compensation range according to the corresponding relation between the bending angle of the folding screen and the three-primary-color brightness compensation range aiming at each gray scale.
7. The method as claimed in claim 6, wherein the method for obtaining the lookup table of the folding angle and the three-primary-color brightness compensation range of the folding screen further comprises, after calculating the three-primary-color brightness compensation value corresponding to the folding screen at each bending angle between the two adjacent bending angles by interpolating the maximum value of the two sets of the three-primary-color brightness compensation ranges and interpolating the minimum value of the two sets of the three-primary-color brightness compensation ranges, for two adjacent bending angles of the K bending angles, the method for obtaining the lookup table of the folding angle and the three-primary-color brightness compensation ranges further comprises:
obtaining a minimum bending angle and a maximum bending angle in the K bending angles;
if the minimum bending angle is not 0, performing interpolation operation on the maximum value in the corresponding tricolor brightness compensation range and the maximum value in the tricolor reference brightness range according to the minimum bending angle and the bending angle 0; performing interpolation operation on the minimum value in the corresponding tricolor brightness compensation range and the minimum value in the tricolor reference brightness range, and calculating to obtain the tricolor brightness compensation range corresponding to the folding screen under each bending angle between the bending angle 0 and the minimum bending angle;
if the maximum bending angle is smaller than 89, acquiring a three-primary-color brightness value corresponding to the folding screen when the bending angle is 89; calculating to obtain a corresponding tricolor brightness compensation range according to the tricolor brightness value corresponding to the bending angle 89 and the tricolor reference brightness range;
performing interpolation operation on the maximum value in the corresponding two groups of tricolor brightness compensation ranges according to the maximum bending angle and the bending angle 89; and simultaneously carrying out interpolation operation on the minimum value in the two groups of three-primary-color brightness compensation ranges, and calculating to obtain the three-primary-color brightness compensation range corresponding to the folding screen under each bending angle between the maximum bending angle and the bending angle 89.
8. A method of colour shift correction for a folding screen according to any of claims 1 to 4, comprising:
under the gray scale S, acquiring the pressure value of a pressure sensor in the folding screen to be correctedAs a corresponding spring force; the gray scale range is 0-M, M is 2L-1, 0 < S < M, S and L both being positive integers;
searching a lookup table obtained by an obtaining method of the lookup table about the bending angle of the folding screen and the spring elasticity to obtain the bending angle corresponding to the spring elasticity;
aiming at the gray scale S, searching a lookup table obtained by an obtaining method of the lookup table about the bending angle of the folding screen and the tricolor brightness compensation range according to the bending angle of the folding screen to be corrected to obtain the tricolor brightness compensation range corresponding to the folding screen to be corrected;
and compensating the tricolor brightness of the folding screen to be corrected according to the tricolor brightness compensation range.
9. The method for correcting color shift of a foldable screen according to claim 8, wherein after obtaining the bending angle corresponding to the elastic force of the spring and before obtaining the compensation range of brightness of three primary colors corresponding to the foldable screen to be corrected, the method further comprises:
judging whether the bending angle of the folding screen to be corrected is larger than a preset angle threshold value or not;
if not, no compensation is carried out;
if so, searching the lookup table obtained by the method for obtaining the lookup table about the folding angle of the folding screen and the tricolor brightness compensation range according to the folding angle of the folding screen to be corrected, and obtaining the tricolor brightness compensation range corresponding to the folding screen to be corrected.
10. A computer device, comprising a storage unit and a processing unit; the storage unit stores therein a computer program executable on the processing unit and stores the result; the processing unit implements a method for obtaining a look-up table of a folding screen regarding a folding angle and a spring force according to claim 5, and/or a method for obtaining a look-up table of a folding screen regarding a folding angle and a compensation range of three primary color luminance according to any one of claims 6 to 7, and/or a method for correcting color shift of a folding screen according to any one of claims 8 to 9 when executing the computer program.
11. A computer-readable medium, in which a computer program is stored, which, when being executed by a processor, implements a method for obtaining a look-up table relating a bending angle of a folding screen to a spring force according to claim 5, and/or a method for obtaining a look-up table relating a bending angle of a folding screen to a compensation range of three primary color luminances according to any one of claims 6 to 7, and/or a method for correcting a color shift of a folding screen according to any one of claims 8 to 9.
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