CN113066438B - Brightness compensation device and method and display device - Google Patents
Brightness compensation device and method and display device Download PDFInfo
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- CN113066438B CN113066438B CN202110336974.7A CN202110336974A CN113066438B CN 113066438 B CN113066438 B CN 113066438B CN 202110336974 A CN202110336974 A CN 202110336974A CN 113066438 B CN113066438 B CN 113066438B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
Abstract
The invention provides a brightness compensation device, a brightness compensation method and a display device, and relates to the technical field of display. The device includes: the temperature sensing unit comprises a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is arranged between the electric component and the display panel and is used for detecting a first temperature close to the electric component; the second temperature sensor is not overlapped with the projection of the electric component on the display panel and is used for detecting a second temperature far away from the electric component; the control unit is connected with the temperature sensing unit and the display control module and used for determining a compensation parameter according to the average temperature of the first temperature and the second temperature; and the display control module performs brightness compensation according to the compensation parameters. According to the invention, when the electric component generates heat, the temperature difference exists between the position close to the electric component and the position far away from the electric component, and the brightness compensation can be carried out on the display area close to the electric component according to the average temperature close to the electric component and the average temperature far away from the electric component, so that the uniformity of the display brightness is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a brightness compensation apparatus, a brightness compensation method, and a display apparatus.
Background
In some current display devices, such as a large and medium-sized flexible folding notebook, electrical components such as a main board, a battery, and a speaker may be disposed below a display panel. In practical application, because each electric component has high power consumption, the electric components can dissipate heat during working operation, so that a large amount of heat is generated, the local temperature of the display panel is increased, the temperature distribution of the display panel is uneven, and the brightness uniformity of a display picture is reduced.
Disclosure of Invention
The invention provides a brightness compensation device, a brightness compensation method and a display device, and aims to solve the problem that the brightness uniformity of a display picture is reduced due to uneven temperature distribution caused by the fact that the local temperature of a display panel is increased due to heat generated by electric components of the conventional display device.
In order to solve the above problems, the present invention discloses a luminance compensation apparatus applied to a display apparatus including a display control module, a display panel, and at least one electrical component located at one side of the display panel, the luminance compensation apparatus including:
a temperature sensing unit including a first temperature sensor and at least two second temperature sensors, at least one of the first temperature sensors being disposed between each of the electrical components and the display panel, the first temperature sensor being configured to detect a first temperature near the electrical components; the second temperature sensor is arranged on one side of the display panel close to the electric component, the projection of the second temperature sensor on the display panel is not overlapped with the projection of the electric component on the display panel, and the second temperature sensor is configured to detect a second temperature far away from the electric component;
the control unit is connected with the temperature sensing unit and the display control module; the control unit is configured to determine a first average temperature of each of the first temperatures and a second average temperature of each of the second temperatures, and determine a compensation parameter close to a display area of the electrical component according to the first average temperature and the second average temperature; the display control module is configured to perform brightness compensation on a display area near the electrical component according to the compensation parameter.
Optionally, the first temperature sensor is disposed on a surface of the electrical component near the display panel.
Optionally, the display panel includes a first substrate layer and a heat dissipation layer, and the temperature sensing unit is located on a side of the heat dissipation layer away from the first substrate layer.
Optionally, the display panel includes a first substrate layer and a heat dissipation layer, and the temperature sensing unit is located between the heat dissipation layer and the first substrate layer.
Optionally, the temperature sensing unit further includes a second substrate layer and an insulating layer, the first temperature sensor and the second temperature sensor are disposed on the second substrate layer, and the insulating layer covers the first temperature sensor and the second temperature sensor.
Optionally, the temperature sensing unit further comprises a planarization layer disposed on the insulating layer.
Optionally, the first temperature sensor and the second temperature sensor are arranged in an array.
Optionally, the first temperature sensor comprises at least one of a thermocouple, a thermistor, a resistance thermometer, and a thin film thermistor, and the second temperature sensor comprises at least one of a thermocouple, a thermistor, a resistance thermometer, and a thin film thermistor.
In order to solve the above problem, the present invention further discloses a brightness compensation method, which is applied to the above brightness compensation device, and the method includes:
detecting at least one first temperature near an electrical component and at least two second temperatures remote from the electrical component;
determining a first average temperature for each of the first temperatures and a second average temperature for each of the second temperatures;
determining a compensation parameter close to a display area of the electrical component according to the first average temperature and the second average temperature;
and performing brightness compensation on a display area close to the electric component according to the compensation parameter.
Optionally, the determining a compensation parameter of a display area close to the electrical component according to the first average temperature and the second average temperature includes:
determining a temperature threshold corresponding to the temperature increasing from the second average temperature to the first average temperature;
when the temperature difference between the first average temperature and the second average temperature is larger than or equal to the temperature threshold, determining the target pixel brightness corresponding to the second average temperature according to the corresponding relation between the temperature and the pixel brightness;
and determining a target driving current corresponding to the target pixel brightness according to the corresponding relation between the pixel brightness and the driving current to obtain a compensation parameter of a display area close to the electric component.
In order to solve the above problem, the present invention further discloses a display device including the above brightness compensation device.
Compared with the prior art, the invention has the following advantages:
in an embodiment of the present invention, a luminance compensation device includes a temperature sensing unit including a first temperature sensor and at least two second temperature sensors, at least one first temperature sensor disposed between each of electrical components and a display panel, the first temperature sensor configured to detect a first temperature near the electrical components; the second temperature sensor is arranged on one side of the display panel close to the electric components, the second temperature sensor is not overlapped with the projections of the electric components on the display panel respectively, and the second temperature sensor is configured to detect a second temperature far away from the electric components. The control unit is respectively connected with the temperature sensing unit and the display control module; the control unit is configured to determine a first average temperature of the respective first temperatures and a second average temperature of the respective second temperatures, and determine a compensation parameter proximate to a display area of the electrical component based on the first average temperature and the second average temperature. The display control module is configured to perform brightness compensation on a display area close to the electrical component according to the compensation parameter. In the embodiment of the invention, when the electric component generates heat, the temperature difference exists between the position close to the electric component and the position far away from the electric component, so that the brightness compensation can be performed on the display area close to the electric component according to the average temperature close to the electric component and the average temperature far away from the electric component, and the brightness uniformity of the display screen is improved.
Drawings
Fig. 1 is a schematic structural diagram of a luminance compensation apparatus according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of another luminance compensation apparatus according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of another luminance compensation apparatus according to a first embodiment of the present invention;
FIG. 4 illustrates a cross-sectional view of a temperature sensing unit according to a first embodiment of the present invention;
FIG. 5 shows a top view of a temperature sensing unit according to a first embodiment of the invention;
FIG. 6 is a flow chart showing the steps of a brightness compensation method according to a second embodiment of the present invention;
fig. 7 is a block diagram showing a structure of a display device according to a second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Example one
Fig. 1 is a schematic structural diagram illustrating a luminance compensation apparatus according to a first embodiment of the present invention, which can be applied to a display apparatus, and referring to fig. 1, the display apparatus includes a display control module 10, a display panel 20, and at least one electrical component 30 located on one side of the display panel 20, and the luminance compensation apparatus 40 includes:
a temperature sensing unit 41 including a first temperature sensor 411 and at least two second temperature sensors 412, at least one first temperature sensor 411 being disposed between each of the electrical parts 30 and the display panel 20, the first temperature sensor 411 being configured to detect a first temperature near the electrical part 30; the second temperature sensor 412 is disposed on a side of the display panel 20 close to the electrical component 30, a projection of the second temperature sensor 412 on the display panel 20 does not overlap with a projection of the electrical component 30 on the display panel 20, the second temperature sensor 412 is configured to detect a second temperature far from the electrical component 30;
a control unit 42 connected with the temperature sensing unit 41, the control unit 42 being further connected with the display control module 10; the control unit 42 is configured to determine a first average temperature of the respective first temperatures and a second average temperature of the respective second temperatures, determine a compensation parameter for the display area close to the electrical component 30 based on the first average temperature and the second average temperature; the display control module 10 is configured to perform brightness compensation on a display area near the electrical component 30 according to the compensation parameter.
In the embodiment of the present invention, a portion of the temperature sensor may be disposed between the electrical component 30 and the display panel 20, i.e., at a position close to the electrical component 30, to detect a first temperature at the position close to the electrical component 30, and another portion of the temperature sensor may be disposed at a position far from the electrical component 30 to detect a second temperature at the position far from the electrical component 30. When the electrical component 30 generates heat, there is a temperature difference between the position close to the electrical component 30 and the position far from the electrical component 30, that is, the average temperature of the first temperature and the average temperature of the second temperature have a temperature difference, and the display area close to the electrical component 30 can be brightness compensated by the display control module 10 according to the average temperature of the first temperature and the average temperature of the second temperature. In this way, when the temperature distribution is not uniform due to the local temperature rise of the display panel caused by the heat dissipation of the electric component 30, the luminance uniformity of the display screen is improved by performing the luminance compensation on the display region close to the electric component 30.
In practical applications, at least one first temperature sensor 411 is disposed between each of the electrical components 30 and the display panel 20, wherein for any one of the electrical components 30, the at least one first temperature sensor 411 may be located at a center position of an area of the electrical component 30 close to the display panel 20, so that the first temperature close to the electrical component 30 may be detected more accurately.
Alternatively, in one implementation, the first temperature sensor 411 is disposed on a surface of the electrical component 30 close to the display panel 20, and the second temperature sensor 412 may be disposed on the display panel 20. The first temperature sensor 411 may be attached to the surface of the electrical part 30, so that the first temperature near the electrical part 30 may be more accurately detected.
Optionally, in another implementation, the temperature sensor may also be integrated on the display panel 20, and specifically, two alternative integrated implementations may be included.
Fig. 2 shows a schematic structural diagram of another brightness compensation apparatus according to a first embodiment of the present invention, and referring to fig. 2, in a first integrated implementation manner, a display panel 20 includes a first substrate layer 21 and a heat dissipation layer 22, and a temperature sensing unit 41 is located on a side of the heat dissipation layer 22 away from the first substrate layer 21.
Fig. 3 is a schematic structural diagram illustrating a further luminance compensation apparatus according to a first embodiment of the present invention, and referring to fig. 3, in a second integrated implementation, a display panel 20 includes a first substrate layer 21 and a heat dissipation layer 22, and a temperature sensing unit 41 is located between the heat dissipation layer 22 and the first substrate layer 21.
In practical applications, the temperature sensing unit 41 may be disposed on a side of the heat dissipation layer 22 far from the first substrate layer 21, or between the heat dissipation layer 22 and the first substrate layer 21, so that the temperature sensor may be integrated on the display panel 20. The heat dissipation layer 22, i.e., the SCF layer (Super Clean Foam), includes a Foam, a grid adhesive, a copper foil, and the like.
In addition, referring to fig. 2 and fig. 3, the display panel 20 may further include a conventional structure such as an array substrate 23, a display device layer 24, a packaging layer 25, a circular polarizer layer 26, a touch layer 27, and a cover plate 28, which are not described in detail in the embodiment of the present invention.
Further, also optionally, since the SCF layer (heat dissipation layer 22) is formed by stacking a plurality of material film layers, the temperature sensor is also placed between any two material layers inside the SCF layer.
Further alternatively, referring to fig. 4, the temperature sensing unit 41 further includes a second base layer 413 and an insulating layer 414, the first temperature sensor 411 and the second temperature sensor 412 are disposed on the second base layer 413, and the insulating layer 414 covers the first temperature sensor 411 and the second temperature sensor 412. That is, the temperature sensor integrated on the display panel 20 may be disposed between the second base layer 413 and the insulating layer 414 of the temperature sensing unit 41.
In practical applications, when the display panel 20 is a flexible display panel, the second substrate layer 413 may be a flexible substrate layer, and specifically may be a PI (polyimide) film, a PET (polyethylene terephthalate) film, a COP film (chip on film), and the like, which is not particularly limited in this embodiment of the invention. When the display panel 20 is a non-flexible display panel, the second substrate layer 413 may be a flexible substrate layer, and may also be a non-flexible substrate layer.
Further optionally, referring to fig. 4, the temperature sensing unit 41 may further include a planarization layer 415, and the planarization layer 415 is disposed on the insulating layer 414.
By providing the flat layer 415, the temperature sensing unit 41 can be attached to other film layers of the display panel 20, so that the firmness of the temperature sensing unit 41 is enhanced.
Further alternatively, referring to fig. 5, the first temperature sensor 411 and the second temperature sensor 412 may be arranged in an array.
In practical applications, the temperature sensors may be arranged in an array, and then the temperature sensor located between the electrical component 30 and the display panel 20 may be divided into the first temperature sensor 411 and the other temperature sensors far away from the electrical component 30 are divided into the second temperature sensor 412 after the installation position of each electrical component 30 is determined, so that the installation position of the electrical component 30 does not need to be paid attention to in advance, and thus the brightness compensation device may be applied to display devices with different installation positions of different electrical components, and the universality of the brightness compensation device is improved.
In addition, referring to fig. 5, in a specific application, if the display panel 20 is a flexible display panel, the temperature sensor is disposed to avoid the bendable region W of the flexible display panel.
Still alternatively, the first temperature sensor 411 may include at least one of a thermocouple, a thermistor, a resistance thermometer, and a thin film thermistor, and the second temperature sensor 412 may include at least one of a thermocouple, a thermistor, a resistance thermometer, and a thin film thermistor.
The thin film thermistor may be an organic polymer thin film thermistor, an inorganic nonmetal thin film thermistor, or the like, which is not particularly limited in this embodiment of the present invention.
Alternatively, the following provides a method for preparing the temperature sensing unit 41 which can be integrated in the display panel 20, including the following steps:
step (1): and depositing a sacrificial layer on the silicon wafer or the glass layer, coating the PI material, and performing thermal curing to form a second substrate layer. The sacrificial layer can facilitate the peeling of the silicon chip or the glass layer in the subsequent process. The temperature sensing unit with the flexible substrate layer has the characteristics of flexibility, continuity, bending and folding.
Step (2): and coating photoresist, patterning the photoresist, and sputtering and depositing micron-sized metal thermistor thin film patterns to form the array type thin film thermal sensors, wherein the pattern of each thin film thermal sensor is preferably a snake-shaped pattern so as to increase the sensing area. The metal thermistor thin film may be made of a material having a high Temperature Coefficient of Resistance (TCR), such as platinum (Pt) or a platinum alloy, nickel (Ni) or a nickel alloy.
And (3): the film heat-sensitive sensor is subjected to heat treatment in a vacuum environment or a protective atmosphere, and is used for improving the crystal structure in the metal film, reducing the defect concentration and improving and stabilizing the heat-sensitive performance of the metal film.
And (4): the patterned electrode wire is formed by a photoetching process or an electroplating process, and the electrode wire is made of copper (Cu), silver (Ag), gold (Au) and other metals with low resistivity, preferably copper metal with low cost.
And (5): an insulating layer and a planarization layer are formed. The insulating layer or the flat layer may also serve as a protective layer except for its own function, and certainly, in practical application, a protective layer, such as a parylene film, may also be formed in addition to protect the entire thin film thermal sensor array and its routing structure.
And (6): and stripping the silicon chip or the glass and the sacrificial layer from the second substrate layer to obtain the temperature sensing unit.
In an embodiment of the present invention, a luminance compensation device includes a temperature sensing unit including a first temperature sensor and at least two second temperature sensors, at least one first temperature sensor disposed between each of electrical components and a display panel, the first temperature sensor configured to detect a first temperature near the electrical components; the second temperature sensor is disposed on a side of the display panel close to the electrical components, the second temperature sensor does not overlap with projections of the electrical components on the display panel, respectively, and the second temperature sensor is configured to detect a second temperature far from the electrical components. The control unit is respectively connected with the temperature sensing unit and the display control module; the control unit is configured to determine a first average temperature of the respective first temperatures and a second average temperature of the respective second temperatures, and determine a compensation parameter for the display area proximate to the electrical component based on the first average temperature and the second average temperature. The display control module is configured to perform brightness compensation on a display area close to the electrical component according to the compensation parameter. In the embodiment of the invention, when the electric component generates heat, the temperature difference exists between the position close to the electric component and the position far away from the electric component, so that the brightness compensation can be carried out on the display area close to the electric component according to the average temperature close to the electric component and the average temperature far away from the electric component, and the brightness uniformity of the display picture is improved.
Example two
Referring to fig. 6, a flowchart illustrating steps of a luminance compensation method according to a second embodiment of the present invention is applied to the luminance compensation apparatus, and the luminance compensation method includes the following steps:
step 601: at least one first temperature is detected proximate to the electrical component and at least two second temperatures are detected distal to the electrical component.
In this embodiment of the present invention, fig. 7 shows a structural block diagram of a display device according to a second embodiment of the present invention, and referring to fig. 7, in practical applications, the display control module 10 may be a system motherboard of the display device, and specifically may include a memory 11, a processor 12 and a control module 13, where the control module 13 may include a first control chip IC1 for controlling the display panel 20. The control unit 42 may be connected to the first temperature sensor 411 and the second temperature sensor 412 in the temperature sensing unit, respectively, the control unit 42 is further connected to the display control module 10, the display control module 10 is connected to the display panel 20, wherein the control unit 42 may include a second control chip IC2 for controlling the temperature sensing unit 41.
The first temperature sensors may be distributed between the electrical components and the display panel (hereinafter referred to as an area a), and the first temperature sensors may detect a first temperature of the area a, which is T1, T2, … …, Tn, respectively, where n is the number of the first temperature sensors. The second temperature sensors may be distributed in an area without electrical components below the display panel (hereinafter referred to as an area B), and the second temperature sensors may detect a second temperature of the area B, which is t1, t2, … …, ti, respectively, where i is the number of the second temperature sensors.
After the display device is powered on, the control unit may monitor the temperature detected by each temperature sensor in real time, and transmit the temperature periodicity (5 minutes or other interval duration) of each temperature sensor to the processor in the display control module, so that the display control module may obtain the first temperature T1, T2, … …, Tn of each area a directly below the display panel, and the second temperature T1, T2, … …, ti of each area B.
Step 602: a first average temperature for each first temperature and a second average temperature for each second temperature are determined.
In this step, the processor may calculate a first average temperature Ta of the plurality of first temperatures T1, T2, … …, Tn, and a second average temperature Tb of the plurality of second temperatures T1, T2, … …, ti, as follows.
Step 603: and determining a compensation parameter of a display area close to the electric component according to the first average temperature and the second average temperature.
Optionally, the step may be specifically implemented by the following steps:
determining a temperature threshold corresponding to the temperature increasing from the second average temperature to the first average temperature;
when the temperature difference between the first average temperature and the second average temperature is larger than or equal to a temperature threshold value, determining the target pixel brightness corresponding to the second average temperature according to the corresponding relation between the temperature and the pixel brightness;
and determining a target driving current corresponding to the target pixel brightness according to the corresponding relation between the pixel brightness and the driving current to obtain a compensation parameter of a display area close to the electric component.
Wherein, the temperature threshold value can be determined according to the brightness-temperature relation curve of the W picture. The corresponding relation between the temperature and the pixel brightness can be determined according to a brightness-temperature relation curve of an R/G/B picture, and the corresponding relation between the pixel brightness and the driving current can be determined according to a brightness-current relation curve of an R/G/B picture.
Specifically, different luminance-temperature relationship curves exist in W/R/G/B pictures of the display panel respectively, the W/R/G/B luminance-temperature relationship curves can be obtained through experimental tests, and a W/R/G/B luminance-temperature function relationship can be obtained through polynomial fitting. For example, a 3 rd order polynomial fit, the W/R/G/B luminance vs. temperature function may be as follows:
Lumi＝aT3+bT2+cT+d
where Lum is W/R/G/B screen brightness, i is W, R, G or B, T is the temperature measured immediately below the display panel, and a, B, c, and d are fitting parameters.
The test method of the W/R/G/B brightness-temperature relation curve comprises the following steps: and (3) placing surface heating equipment under the display panel, respectively lightening the highest gray scale of the W/R/G/B picture of the display panel, and measuring the chromaticity and brightness change of the heated area of the display panel by using a color analyzer. Optionally, 1 ℃ is used as a temperature test sampling step, after the chromaticity and brightness of the W picture are changed stably before and after heating, the brightness of the central point of the heating area of the display panel is changed by more than 3%, and the chromaticity is changed by more than 5 ‰ (the specific change threshold can be determined according to actual conditions), at this time, it can be determined that the display chromaticity and brightness difference caused by the temperature change can be perceived by human eyes, and at this time, the increased temperature can be defined as a temperature threshold Tth。
Due to the display panel W/R/GThe chromaticity and brightness of B picture do not have linear relation with the temperature change, so the temperature threshold T is different under different initial temperaturesthNor is it identical, i.e. for different first average temperatures Ta and different second average temperatures Tb, for a temperature threshold TthDifferent. For example, when the local area temperature of the display panel gradually increases from T1 to T2, the temperature difference reaching the threshold condition is Tth1, when the temperature of the local area of the display panel gradually increases from T2 to T3, the temperature difference reaching the threshold condition is Tth2, wherein, Tth1 is not equal to Tth2。
In practical application, the temperature thresholds corresponding to the temperature increases from the second average temperature to the first average temperature may be stored in the memory in advance, so that the processor may determine the temperature threshold T corresponding to the temperature increase from the second average temperature to the first average temperature by looking up the tableth. In a particular application, the Wbrightness-temperature relationship curve can be used to determine the temperature threshold TthAnd the R/G/B luminance-temperature relationship can be subsequently used in the compensation process. The R/G/B luminance-temperature relationship curve may also be stored in the memory in advance, and the luminance-temperature relationship curve may reflect the correspondence between the temperature and the luminance of the pixel. When the temperature increase reaches a threshold condition, i.e., Δ T ≧ Δ TthIn the case of (Δ T — Ta-Tb), the target pixel luminance corresponding to the second average temperature may be determined according to the correspondence between the temperature and the pixel luminance, that is, the pixel luminance needs to be compensated to the target pixel luminance.
In specific application, the OLED display panel is a current driving device, the luminance of the OLED display panel is in direct proportion to the driving current, and R/G/B pictures respectively have different current-luminance relation curves. The R/G/B current-luminance relationship curve can be obtained in advance through actual tests and stored in a memory in advance, and the current-luminance relationship curve can reflect the corresponding relationship between the pixel luminance and the driving current.
When the temperature increase condition reaches the threshold value condition, the processor can determine the target driving current corresponding to the brightness of the target pixel in a table look-up mode to obtain the compensation parameter of the display area close to the electric component, namely the processor can calculate the target driving current of the RGB maximum gray scale required by the local temperature rise position according to the R/G/B brightness-temperature function relation and the R/G/B current-brightness function curve, and the target driving currents of other gray scales of the RGB picture can be obtained by interpolation fitting according to a gamma curve.
The W/R/G/B brightness-temperature function relation and the R/G/B current-brightness function curve can be stored in a memory, and the processor can directly read and call the W/R/G/B brightness-temperature function relation and the R/G/B current-brightness function curve and calculate to obtain final RGB target driving current data so as to be used as compensation parameters to perform brightness compensation on a display area close to the electrical component.
Step 604: and performing brightness compensation on the display area close to the electric component according to the compensation parameter.
In this step, the processor may transmit the compensation parameter, that is, the RGB target driving current data, to the control module, and then the control module may drive the pixels in the display region close to the electrical component according to the RGB target driving current data, thereby realizing the brightness compensation of the display region close to the electrical component. Therefore, the brightness of the display area close to the electric component can be changed, the brightness difference caused by temperature is compensated, and the brightness uniformity of the display panel is improved.
For a specific display device, the positions of all the electrical components below the display panel are determined, and each of the one or more temperature sensors corresponds to one electrical component position and a certain local area of the display panel, so that the position of the display area to be compensated can be known.
In the embodiment of the present invention, the brightness compensation device may detect at least one first temperature near the electrical component and at least two second temperatures far from the electrical component, determine a first average temperature of each first temperature and a second average temperature of each second temperature, determine a compensation parameter of the display area near the electrical component according to a difference between the first average temperature and the second average temperature, and perform brightness compensation on the display area near the electrical component according to the compensation parameter. In the embodiment of the invention, when the electric component generates heat, the temperature difference exists between the position close to the electric component and the position far away from the electric component, so that the brightness compensation can be carried out on the display area close to the electric component according to the average temperature close to the electric component and the average temperature far away from the electric component, and the brightness uniformity of the display picture is improved.
EXAMPLE III
The embodiment of the invention also discloses a display device which comprises the brightness compensation device.
In an embodiment of the present invention, a luminance compensation device includes a temperature sensing unit and a control unit, the temperature sensing unit including a first temperature sensor and at least two second temperature sensors, at least one first temperature sensor being disposed between each of electrical components and a display panel, the first temperature sensor being configured to detect a first temperature near the electrical components; the second temperature sensor is disposed on a side of the display panel close to the electrical components, the second temperature sensor does not overlap with projections of the electrical components on the display panel, respectively, and the second temperature sensor is configured to detect a second temperature far from the electrical components. The control unit is respectively connected with the temperature sensing unit and the display control module; the control unit is configured to determine a first average temperature of the respective first temperatures and a second average temperature of the respective second temperatures, and determine a compensation parameter proximate to a display area of the electrical component based on the first average temperature and the second average temperature. The display control module is configured to perform brightness compensation on a display area close to the electrical component according to the compensation parameter. In the embodiment of the invention, when the electric component generates heat, the temperature difference exists between the position close to the electric component and the position far away from the electric component, so that the brightness compensation can be performed on the display area close to the electric component according to the average temperature close to the electric component and the average temperature far away from the electric component, and the brightness uniformity of the display screen is improved.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The present invention provides a brightness compensation device, method and display device, which are introduced in detail above, and the principle and the implementation of the present invention are explained in the present document by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A luminance compensation apparatus applied to a display apparatus including a display control module, a display panel, and at least one electrical component on one side of the display panel, the luminance compensation apparatus comprising:
a temperature sensing unit including a first temperature sensor and at least two second temperature sensors, at least one of the first temperature sensors being disposed between each of the electrical components and the display panel, the first temperature sensor being configured to detect a first temperature near the electrical components; the second temperature sensor is arranged on one side of the display panel close to the electric component, the projection of the second temperature sensor on the display panel is not overlapped with the projection of the electric component on the display panel, and the second temperature sensor is configured to detect a second temperature far away from the electric component;
the control unit is connected with the temperature sensing unit and the display control module; the control unit is configured to determine a first average temperature of each of the first temperatures and a second average temperature of each of the second temperatures, and determine a compensation parameter near a display area of the electrical component based on the first average temperature and the second average temperature; the display control module is configured to perform brightness compensation on a display area close to the electrical component according to the compensation parameter;
the first temperature sensor and the second temperature sensor are integrated on the display panel, and the first temperature sensor and the second temperature sensor are arranged in an array.
2. The luminance compensation device as claimed in claim 1, wherein the display panel comprises a first substrate layer and a heat dissipation layer, and the temperature sensing unit is located on a side of the heat dissipation layer away from the first substrate layer.
3. The luminance compensation device of claim 1, wherein the display panel comprises a first substrate layer and a heat dissipation layer, and the temperature sensing unit is located between the heat dissipation layer and the first substrate layer.
4. The luminance compensation device according to any one of claims 2 to 3, wherein the temperature sensing unit further includes a second substrate layer on which the first temperature sensor and the second temperature sensor are disposed, and an insulating layer covering the first temperature sensor and the second temperature sensor.
5. The luminance compensation device according to claim 4, wherein the temperature sensing unit further comprises a planarization layer disposed on the insulating layer.
6. The luminance compensation device according to claim 1, wherein the first temperature sensor includes at least one of a thermocouple, a thermistor, a resistance thermometer, and a thin film thermistor, and the second temperature sensor includes at least one of a thermocouple, a thermistor, a resistance thermometer, and a thin film thermistor.
7. An illumination compensation method applied to the illumination compensation apparatus according to any one of claims 1 to 6, the method comprising:
detecting at least one first temperature near an electrical component and at least two second temperatures remote from the electrical component;
determining a first average temperature for each of the first temperatures and a second average temperature for each of the second temperatures;
determining a compensation parameter of a display area close to the electrical component according to the first average temperature and the second average temperature;
performing brightness compensation on a display area close to the electric component according to the compensation parameter;
the first temperature sensor and the second temperature sensor are integrated on the display panel, and the first temperature sensor and the second temperature sensor are arranged in an array.
8. The method of claim 7, wherein determining compensation parameters for a display area proximate to the electrical component based on the first average temperature and the second average temperature comprises:
determining a temperature threshold corresponding to the temperature increasing from the second average temperature to the first average temperature;
when the temperature difference between the first average temperature and the second average temperature is larger than or equal to the temperature threshold, determining the target pixel brightness corresponding to the second average temperature according to the corresponding relation between the temperature and the pixel brightness;
and determining a target driving current corresponding to the target pixel brightness according to the corresponding relation between the pixel brightness and the driving current to obtain a compensation parameter of a display area close to the electric component.
9. A display device comprising the luminance compensation device as claimed in any one of claims 1 to 6.
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| CN113808535B (en) * | 2021-09-15 | 2023-01-17 | 京东方科技集团股份有限公司 | Temperature control device of display substrate and Gamma curve correction method and device |
| CN114495823A (en) * | 2022-01-11 | 2022-05-13 | 集创北方(珠海)科技有限公司 | Display panel brightness compensation method and device and display terminal |
| CN114360455B (en) * | 2022-01-18 | 2023-11-28 | 深圳市华星光电半导体显示技术有限公司 | display device |
| CN115472136B (en) * | 2022-08-16 | 2023-11-10 | 昆山国显光电有限公司 | Display panel and electronic equipment |
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