CN116778845A - Display device and image display method - Google Patents

Display device and image display method Download PDF

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Publication number
CN116778845A
CN116778845A CN202310802335.4A CN202310802335A CN116778845A CN 116778845 A CN116778845 A CN 116778845A CN 202310802335 A CN202310802335 A CN 202310802335A CN 116778845 A CN116778845 A CN 116778845A
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CN
China
Prior art keywords
ambient light
brightness
target
lookup table
illuminance
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Pending
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CN202310802335.4A
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Chinese (zh)
Inventor
杜唯佳
王建亭
郭瑞
田雪
万争艳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by BOE Technology Group Co Ltd, Beijing BOE Display Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to CN202310802335.4A priority Critical patent/CN116778845A/en
Publication of CN116778845A publication Critical patent/CN116778845A/en
Pending legal-status Critical Current

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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
    • G09G3/2007—Display of intermediate tones
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2074—Display of intermediate tones using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light

Abstract

The disclosure relates to a display device and an image display method, and relates to the technical field of display. The display device comprises a display panel, a photosensitive device and a control circuit, wherein the display panel comprises a plurality of sub-pixels; the photosensitive device is arranged on the display panel and used for detecting the illuminance of the ambient light. The control circuit is used for determining target brightness of each sub-pixel under a plurality of colors according to the ambient light brightness reflected by the display panel and the acquired initial display data, and controlling the display panel to display a target image according to the target brightness; the initial display data includes initial gray levels of each sub-pixel in a plurality of colors. The display device and the image display method can improve the problem of low gray level loss and image distortion.

Description

Display device and image display method
Technical Field
The disclosure relates to the technical field of display, and in particular relates to a display device and an image display method.
Background
At present, the display device is widely applied to terminal equipment such as mobile phones, televisions, tablet computers, smart watches and the like. When in use, the problem of image distortion sometimes occurs, and in particular, at low gray levels, the hierarchy loss occurs.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure provides a display device and an image display method, which can solve the problems of low gray level loss and image distortion.
According to an aspect of the present disclosure, there is provided a display device including:
a display panel including a plurality of sub-pixels;
the photosensitive device is arranged on the display panel and used for detecting the illuminance of the ambient light;
the control circuit is used for determining target brightness of each sub-pixel in a plurality of colors according to the ambient light brightness reflected by the display panel and the acquired initial display data, and controlling the display panel to display a target image according to the target brightness; the initial display data comprises initial gray scales of each sub-pixel in a plurality of colors; the ambient light level, the initial gray level, and the target brightness satisfy the following formula:
L j is the target brightness at j gray levels, and j e (0, 2) n -1)；L max Maximum brightness of the display panel; l (L) AK Is the ambient light level; j (J) AK Gray scale of the ambient light brightness under the first gamma; gamma_o is the first gamma; gamma_pk is the second gamma; n is a positive integer.
In one exemplary embodiment of the present disclosure, the ambient illuminance and the ambient light brightness satisfy the following formula:
L A ＝S.ALS Data ； (3)
L A is the ambient light level; ALS (ALS) Data The ambient illuminance; s is a slope coefficient.
In one exemplary embodiment of the present disclosure, the ambient illuminance is an average of at least a portion of a plurality of illuminance sample values detected by the photosensitive device.
In an exemplary embodiment of the present disclosure, the control circuit presets a plurality of look-up tables, any one of which includes 2 n At least part of the target brightness in different lookup tables is different; different ones of the look-up tables correspond to different ones of the ambient light levels.
In an exemplary embodiment of the present disclosure, the display panel includes a bezel covering an edge of the display panel, the bezel being provided with light holes;
the photosensitive device is arranged in the frame and corresponds to the light hole.
In an exemplary embodiment of the present disclosure, the bezel is provided with a neutral-attenuation sheet covering the light-transmitting hole.
According to one aspect of the present disclosure, there is provided an image display method of a display device including a display panel having a plurality of sub-pixels; the image display method comprises the following steps:
detecting the ambient illuminance of the environment in which the display panel is positioned;
determining the brightness of the ambient light reflected by the display panel according to the ambient illuminance;
determining target brightness of each sub-pixel according to the ambient light brightness; the target brightness satisfies the following formula:
L j is the target brightness at j gray levels, and j e (0, 2) n -1)；L max Maximum brightness of the display panel; l (L) AK Is the ambient light level; j (J) AK Gray scale of the ambient light brightness under the first gamma; gamma_o is the first gamma; gamma_pk is the second gamma; n is a positive integer;
and controlling the display panel to display a target image according to the target brightness.
In one exemplary embodiment of the present disclosure, an ambient illuminance of an environment in which the display panel is located is detected; comprising the following steps:
detecting the ambient light for multiple times to obtain multiple ambient light sampling values;
and taking the average value of at least a part of the ambient light sampling values as ambient light illumination.
In one exemplary embodiment of the present disclosure, an average value of at least a portion of the ambient light sample values is taken as the ambient light illuminance; comprising the following steps:
calculating the average value and standard deviation of each ambient light sampling value;
calculating an average value of the ambient light sampling values in the designated interval as ambient light illuminance;
the specified interval is (mu-2σ, mu+2σ);
mu is the average value of all the ambient light sampling values; σ standard deviation of each of the ambient light sample values.
In one exemplary embodiment of the present disclosure, the ambient light brightness reflected by the display panel is determined according to the ambient light illuminance; comprising the following steps:
calculating the brightness of the ambient light reflected by the display panel according to the ambient illuminance and the formula (3); equation (3) is as follows:
L A ＝S.ALS Data ； (3)
L A is the ambient light level; ALS (ALS) Data Illuminance for the ambient light; s is a slope coefficient.
In one exemplary embodiment of the present disclosure, a target luminance of each of the sub-pixels is determined according to the ambient light level; comprising the following steps:
selecting a lookup table corresponding to the ambient light brightness from a plurality of lookup tables according to the ambient light brightness as a target lookup table; the lookup table comprises 2 n The brightness of the target lookup table is the target brightness; at least some of the brightnesses in different look-up tables are different.
In an exemplary embodiment of the present disclosure, the image display method further includes:
setting up m incremental ambient light brightness and m+1 incremental ambient light illumination, taking the kth ambient light illumination as a lower comparison value of the kth ambient light brightness, and taking the kth+1 ambient light illumination as an upper comparison value of the kth ambient light brightness; the lookup table corresponding to the kth ambient light level is the kth lookup table; m is more than or equal to k is more than or equal to 1, and m is more than 2;
selecting a lookup table corresponding to the ambient light brightness from a plurality of lookup tables according to the ambient light brightness as a target lookup table; comprising the following steps:
if the current ambient light brightness is the kth ambient light brightness, the target lookup table is the kth lookup table;
comparing the upper comparison value of the ambient illuminance and the kth ambient light brightness in real time, and comparing the lower comparison value of the ambient illuminance and the kth ambient light brightness in real time;
if ALS Data ≥ALS Data(k+1) (1+q), then taking the k+1-th lookup table as the target lookup table;
ALS Data illuminance for the ambient light; ALS (ALS) Data(k+1) K+1th ambient illuminance;
0.5＞Q＞0。
in an exemplary embodiment of the present disclosure, the image display method further includes: if ALS Data ≤ALS Data(k-1) (1-W), using a k-1 lookup table as the target lookup table;
ALS Data(k-1) is the k-1 ambient illuminance; 0 > W > 0.5.
In one exemplary embodiment of the present disclosure, q=w=0.2.
In an exemplary embodiment of the present disclosure, the image display method further includes:
if ALS Data ≥ALS Data(m+1) (1+q), maintaining a kth lookup table as the target lookup table;
if ALS Data ≤ALS Data(m-1) (1-W), a kth lookup table is maintained as the target lookup table.
The display device and the image display method of the present disclosure do not directly display an image according to an initial gray scale, but redetermine the target brightness of each sub-pixel according to the ambient light brightness obtained by detecting the ambient light, and display a target image according to the target brightness. Because the target brightness and the ambient light brightness meet the formula (1) and the formula (2), the influence of the ambient light on the visual effect can be made up, and the problems of low gray level layer loss and image distortion caused by the ambient light can be improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 is a schematic structural diagram of an embodiment of a display device of the present disclosure. .
Fig. 2 is a schematic diagram of a display panel according to an embodiment of the display device of the disclosure.
Fig. 3 is a schematic diagram illustrating an installation of a frame and a photosensitive device in an embodiment of a display device according to the disclosure.
Fig. 4 is a flowchart of determining a lookup table according to an embodiment of the display device of the present disclosure.
FIG. 5 is a graph showing the relationship between ambient light brightness and ambient illuminance in one embodiment of a display device according to the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.
The disclosed embodiments provide a display device, as shown in fig. 1-3, which may include a display panel 1, a photosensitive device 2, and a control circuit 3, wherein:
the display panel 1 includes a plurality of sub-pixels;
the photosensitive device 2 is arranged on the display panel 1 and is used for detecting the illuminance of ambient light;
the control circuit 3 is used for determining target brightness of each sub-pixel in a plurality of colors according to the ambient light brightness reflected by the display panel 1 determined by the ambient illuminance and the acquired initial display data, and controlling the display panel 1 to display a target image according to the target brightness; the initial display data includes initial gray levels of each sub-pixel in a plurality of colors; the ambient light level, the initial gray level, and the target brightness satisfy the following formulas:
L j is the target brightness in the j gray scales, and j epsilon (0, 2) n -1)；L max Is the maximum brightness of the display panel 1; l (L) AK Is an ambient light level; j (J) AK The gray scale of the ambient light brightness under the first gamma is set; gamma_o is the first gamma; gamma_pk is the second gamma; n is a positive integer.
The inventor finds that when the ambient light irradiates the display device, part of the light is reflected by the display device, the brightness of the reflected light can be improved to cause the brightness of the display device, and the brightness difference of adjacent gray scales of the display device under the low gray scales is smaller, so that the human eyes distinguish different gray scales under the low gray scales due to the influence of the ambient light, the low gray scales are lost, and the image is distorted. The display device according to the embodiment of the disclosure does not directly display an image according to the initial gray scale, but redetermines the target brightness of each sub-pixel according to the ambient light brightness obtained by detecting the ambient light, and displays the target image according to the target brightness. Because the target brightness and the ambient light brightness meet the formula (1) and the formula (2), the influence of the ambient light on the visual effect can be made up, and the problems of low gray level layer loss and image distortion caused by the ambient light can be improved.
The display device of the present disclosure is described in detail below:
as shown in fig. 1 to 3, the display device may include a display panel 1, a photosensitive device 2, and a control circuit 3, wherein:
the display panel 1 has a plurality of pixels, each including three or more sub-pixels.
The display panel 1 may be a liquid crystal display panel (LCD) or a display panel using an Organic Light Emitting Diode (OLED), and of course, may be a display panel using Micro LEDs or Mini LEDs, which are not particularly limited.
As shown in fig. 2, taking a liquid crystal display panel as an example, the liquid crystal display panel may include a liquid crystal display module PNL and a backlight module BLU, the liquid crystal display module PNL may include an array substrate TB and a counter substrate FB disposed opposite to each other, and may further include a liquid crystal layer LL disposed between the array substrate TB and the counter substrate FB.
The liquid crystal display module PNL further includes a pixel electrode and a common electrode. The pixel electrode may be disposed on the array substrate TB, the common electrode may be disposed on the array substrate TB or the opposite substrate FB, and a pixel may include a pixel electrode and a corresponding liquid crystal layer LL. The array substrate TB has a driving circuit, and the control circuit CU controls the voltage between the pixel electrode and the common electrode through the driving circuit, so as to control the deflection degree of the liquid crystal molecules of the liquid crystal layer LL, further control the transmittance of each sub-pixel to light, and realize the adjustment of the brightness of each sub-pixel, thereby realizing the adjustment of gray scale.
The liquid crystal display module PNL may be divided into a display area and a peripheral area located outside the display area, and the liquid crystal display module PNL may include a pixel circuit located in the display area and connected to the pixel circuit and a peripheral circuit located in the peripheral area, and the peripheral circuit may include a gate driving circuit and a source driving circuit, the gate driving circuit may scan each pixel circuit, control a timing thereof, and the source driving circuit may be used to transmit a data signal to each pixel circuit, thereby controlling voltages of the pixel electrode and the common electrode.
The backlight module BLU may be disposed on a side of the array substrate TB away from the opposite substrate FB, and may emit light to the array substrate TB under the control of the control circuit CU.
In some embodiments, the opposite substrate FB may include a color film layer, the color film layer includes a plurality of light filtering portions, a sub-pixel may include a light filtering portion, and through the filtering effect of the light filtering portion, one pixel emits monochromatic light, and the light emission colors of different pixels may be different.
As shown in fig. 1 and 3, the display device may further include a frame 4, which may cover the edge of the display panel 1, and the edges of the liquid crystal display module PNL and the backlight module BLU are located in the frame 4. The frame 4 may be provided with light transmission holes 41 for transmitting ambient light.
The photosensitive device 2 can be disposed in the frame 4 and is disposed corresponding to the light hole 41, and the ambient light can be irradiated to the photosensitive device 2 through the light hole 41. For example, the photosensitive device 2 may include a circuit board 22 and a photosensor 21 disposed on the circuit board 22, and the photosensor 21 may correspond to the light hole 41 for sensing ambient light. The circuit board 22 may be fixed in the frame 4, for example, the frame 4 may be provided with mounting holes 42, and the circuit board 22 may be detachably connected to the frame 4 by screws matched with the mounting holes 42, or of course, the circuit board 22 may be fixed in the frame 4 by other manners such as bonding, which is not limited herein.
In addition, in order to avoid that the illuminance of the ambient light exceeds the detection range of the photosensor 21, a neutral attenuation sheet covering the light hole 41 may be provided at the bezel 4, which may play a role of filtering, but not for a specific color.
As shown in fig. 1, the control circuit 3 may control the display panel 1 to display an image, and may include a main control circuit 31, a timing controller 34, a gamma circuit, a power supply circuit 32, and a backlight driving circuit 33, and the main control circuit 31 may be an SOC (system on a chip) that may be connected to the timing controller 34 and the power supply circuit 32 and the backlight driving circuit 33. The main control circuit 31 may receive or generate display data, the timing controller 34 may generate a driving signal according to the display data, control the gate driving circuit to scan the pixel circuit through the driving signal, and control voltages of the pixel electrode through the source driving circuit and the gamma circuit. Meanwhile, the main control circuit 31 can also control the light emitting brightness of the backlight module BLU through the backlight driving circuit 33. The power supply circuit 32 supplies power to the control circuit 3. In addition, the control circuit 3 may further include a play control circuit 35 connected to the main control circuit 31, which may control the image display through the main control circuit 31 in response to a certain operation.
The photosensitive device 2 may be connected to the control circuit 3, for example, the circuit board 22 of the photosensitive device 2 is connected to the main control circuit 31 through an interface thereon, and transmits the data detected by the transmitter to the main control circuit 31.
The following is an exemplary description of the operation principle of the display device of the present disclosure in connection with an image display method:
the image display method of the present disclosure may include step S10 to step S40, wherein:
step S10, detecting the ambient illuminance of the environment where the display panel is located;
step S20, determining the brightness of the ambient light reflected by the display panel according to the ambient illuminance;
step S30, determining target brightness of each sub-pixel according to the ambient light brightness; the target brightness satisfies the following formula:
L j is the target brightness in the j gray scales, and j epsilon (0, 2) n -1)；L max Is the maximum brightness of the display device; l (L) AK Is an ambient light level; j (J) AK The gray scale of the ambient light brightness under the first gamma is set; gamma_o is the first gamma; gamma_pk is the second gamma; n is a positive integer;
step S40, controlling the display panel to display the target image according to the target brightness.
The following details the steps:
in step S10, the ambient light can be detected by the photosensitive device 2 to obtain the ambient illuminance, and in this process, the ambient illuminance can be detected in real time or at regular time. Meanwhile, the display device can be used in a plurality of scenes with different ambient lights, and the ambient light in the same scene can also change, so that the required ambient illuminance can be obtained according to the acquired numerical value for a plurality of times, and the accuracy is improved. For example:
in some embodiments of the present disclosure, the ambient illuminance of the environment in which the display panel 1 is located is detected; namely, step S10 may include:
and step S110, detecting the ambient light for a plurality of times to obtain a plurality of ambient light sampling values.
Ambient light can be detected in real time through the photosensitive device 2, and an ambient light sampling value is output in real time, wherein the ambient light sampling value is illuminance. Of course, the sampling may be timed as long as the data can be acquired multiple times. For example, a fixed sampling period or sampling number may be set, and an ambient light sampling value acquired in one sampling period or an ambient light sampling value of a certain sampling number may be used to calculate an ambient light illuminance.
Step S120, taking the average value of at least a part of the ambient light sampling values as the ambient light illumination.
The sampled value of the ambient light detected by the photosensitive device 2 may be output to the main control circuit 31 of the control circuit 3, so as to remove some possible excessive or insufficient abrupt change data, which may be caused by the sudden occurrence of the lamp of the automobile or the shielding of the human body, etc., and if the influence caused by such a change is considered in displaying the image, the image change is too frequent, and the display effect is affected.
Further, in order to reject abnormal sampling values and reduce the interference of abrupt data, in some embodiments of the present disclosure, considering that the ambient light sampling values are normally distributed, step S120 may include steps S1210-S1220, wherein:
step S1210, calculating the average value and standard deviation of each ambient light sampling value.
The average μ of all ambient light samples for one sampling period or number of samples can be calculated, and the standard deviation σ can be calculated as follows:
x 1 -x n for each ambient light sample value, the number of n ambient light sample values.
Step S1220, calculating an average value of the ambient light sampling values within the specified interval as the ambient illuminance.
The specified interval may be (μ -2σ, μ+2σ) to provide ambient light samples less than μ -2σ and greater than μ+2σ, although 2σ may be replaced with 3σ to reduce culled data.
In addition, abnormal sampling values can be removed by adopting other modes such as box line diagrams and the like, and the details are not described here.
In step S20, in the case where the photosensitive device 2 and the display device are determined, the ambient illuminance and the ambient light reflected by the display device are in a linear relationship, so that only the slope coefficient S is determined, the slope coefficient ALS is determined according to the ambient illuminance Data Determining ambient light level L A . Therefore, for a display device, the slope coefficient S of a straight line reflecting the relationship between two different ambient light levels can be determined as long as the ambient light levels at the two different ambient light levels are tested. Thus, in some embodiments of the present disclosure, step S120 may include:
as shown in fig. 5, ALS is based on ambient light illumination Data And equation (3) calculates the ambient light level L reflected by the display panel 1 A The method comprises the steps of carrying out a first treatment on the surface of the Equation (3) is as follows:
L A ＝S·ALS Data ；(3)
L A is the ambient light brightness; ALS (ALS) Data Is the ambient illuminance; s is the slope coefficient S.
In some embodiments of the present disclosure, a straight line reflecting a linear relationship between the above equation (3) and the ambient light levels at a plurality of ambient light levels may be determined, and a plurality of illumination intervals may be formed using a plurality of discrete ambient light levels, each of which may correspond to one ambient light level, for example, the ambient light level corresponding to one point (e.g., a midpoint) within one illumination interval may be regarded as the ambient light level corresponding to all points within the illumination interval.
In step S30, there are at least three sub-pixels having different emission colors in the display device, for example, a sub-pixel emitting red light (R), a sub-pixel emitting green light (G), and a sub-pixel emitting blue light (B). The brightness of the sub-pixels of each color needs to be redetermined, but the specific manner is the same, that is, the sub-pixels of each color do not adopt the brightness corresponding to the initial gray scale, but need to be converted into the target brightness first, and then the display panel 1 is controlled to display the image according to the target brightness.
The gray scale corresponding to the ambient light brightness under the first gamma can be determined according to the ambient light brightness and the maximum brightness of the display device, and then 2 is redetermined according to the gray scale under the second gamma n The brightness of each gray level under each gray level, that is, the brightness of each gray level is re-expressed, and the re-expressed brightness is the target brightness, where the target brightness can satisfy the following formula:
wherein L is j Is the target brightness in the j gray scales, and j epsilon (0, 2) n -1); n is a positive integer, for example, n=8, and includes 0 to 255 for a total of 256 gray scales. L (L) max The maximum brightness of the display panel 1 itself, i.e., the maximum brightness of the display device; l (L) AK Is an ambient light level; j (J) AK The gray scale of the ambient light brightness under the first gamma is set;
gamma_o is a first gamma, which may be 2.2.gamma_pk is a second gamma which may be the same as the first gamma, both may be 2.2, of course gamma_pk may also be different from gamma_o, depending on the color preference of the user.
For any display device, the brightness and gray scale can satisfy the following formula:
in a corresponding manner,
l in formula (4) j For the brightness corresponding to the j gray scale under gamma_o, gamma_o may be 2.2.n is a positive integer, for example, n=8, and includes 0 to 255 for a total of 256 gray scales. The above formulas (1) and (2) both conform to formulas (4) and (5).
L max +L AK The maximum brightness of the display device, i.e., the sum of the maximum brightness of the display device itself and the ambient light brightness, is visually perceived.
For the visual brightness corresponding to the j gray scale under gamma_pk, subtracting the ambient light brightness L AK After that, the brightness L of the display panel 1 itself can be obtained j ；/>Is 2 n The gray level J of the ambient light brightness under the first gamma is removed from the gray levels AK The gray scale after the process is 2 n Duty ratio in each gray level.
Furthermore, in some embodiments of the present disclosure, L may be derived from formulas (2) and (5) above as based on formula (5) j The gray level j of gamma_0 under the first gamma p＇ For j of p＇ Rounding to obtain j p Thus, according to j p And L j The corresponding relation of the (c) is a new gamma curve, i.e. a new gamma is obtained for the control circuit 3 to call.
When the target brightness is determined, the target brightness can be calculated in real time through the formulas (1) and (2), but the calculation amount is large, so that the efficiency is not improved and the energy consumption is reduced. Thus, multiple look-up tables may be pre-established for different ambient light levels, each look-up table may include 2 n The brightness, n being a positive integer, e.g，n＝8，2 n -1 may be 255, plus 0 gray scale, for a total of 256 luminances. For example, it may be the brightness of the target look-up table as the target brightness; at least part of brightness in different lookup tables is different, the lookup table corresponds to one ambient light brightness, after the ambient light brightness is determined, the target brightness corresponding to each initial gray scale can be obtained only by finding out the corresponding lookup table, and therefore display data can be converted, and data reflecting the initial gray scale and the target brightness can be obtained.
Meanwhile, because the ambient light is not constant, the display device needs to continuously screen the lookup table along with the change of the ambient light illumination in the display process. However, if the new lookup table is called due to sudden ambient light changes such as the shielding of the car lights or the human body, the images can flash visually and obviously, which affects the viewing of users. Thus, in some embodiments of the present disclosure, the image display method may further include:
step S50, setting up m incremental ambient light levels and m+1 incremental ambient light levels, wherein a lookup table corresponding to the kth ambient light level can be defined as a kth lookup table, and correspondingly, the lookup table corresponding to the kth+1 ambient light level is a kth+1 lookup table; m is greater than or equal to k is greater than or equal to 1, and m is greater than 2.
The difference between the adjacent two ambient light levels is unchanged, i.e. the ambient light levels may be in an equal difference array. The difference between the adjacent two ambient light illumination levels is unchanged, i.e. the ambient light illumination levels can be in an arithmetic series. Of course, the ambient light level and the ambient illuminance may be distributed in other ways instead of using an arithmetic progression.
According to m+1 ambient light illumination, m illumination intervals can be obtained, wherein the boundary point of one illumination interval is two adjacent ambient light illumination, for example, the lower boundary point of the kth illumination interval is the kth ambient light illumination, and the upper boundary point is the k+1 ambient light illumination. The ambient light brightness corresponding to all points in the kth illumination interval can be the same, and the ambient light brightness is the kth ambient light brightness, so that the operation amount can be reduced.
The kth ambient illuminance may be defined as a lower comparison value of the kth ambient light level, and the kth +1 ambient illuminance may be defined as an upper comparison value of the kth ambient light level.
The determination of the look-up table may be performed cyclically and in a cross-over manner, in particular:
as shown in fig. 4 and 5, the kth ambient light level is taken as the current ambient light level, the kth lookup table is taken as the current lookup table, and the display device can display the image according to the target brightness of the kth lookup table. Meanwhile, the control circuit 3 may compare the illuminance of the ambient light detected by the sensing device with the upper and lower comparison values of the illuminance of the kth ambient light, and determine the target lookup table according to the comparison result, specifically:
if ALS Data ≥ALS Data ( k+1) (1+Q), the k+1 lookup table is taken as the target lookup table.
ALS Data For the detected ambient illuminance; ALS (ALS) Data(k+1) Is the k+1 ambient illuminance, i.e., the upper comparison of the k ambient light level. 0.5 > Q > 0. That is, in ALS Data Greater than ALS Data(k+1) When the exceeding amplitude reaches Q, the kth lookup table corresponding to the kth ambient light brightness is not adopted, and the kth+1 lookup table corresponding to the kth+1 ambient light brightness is adopted as the target lookup table. If the amplitude is not reached, the kth lookup table is still employed as the target lookup table.
If ALS Data ≤ALS Data(k-1) (1-W), the k-1 lookup table is taken as the target lookup table.
ALS Data(k-1) A lower comparison value for the kth ambient light level, i.e., the kth ambient light level; 0 > W > 0.5. That is, in ALS Data Less than ALS Data(k+1) When the smaller amplitude reaches Q, a kth lookup table corresponding to the kth ambient light brightness is not adopted any more, and a kth-1 lookup table corresponding to the kth-1 ambient light brightness is adopted as a target lookup table; if the amplitude is not reached, the kth lookup table is still employed as the target lookup table.
Therefore, the lookup table can be determined continuously according to the change of the ambient light, and the lookup table can be kept unchanged when the ambient light is suddenly changed, so that flickering is avoided.
The above Q and W may be equal, and according to experimental analysis, when both are equal to 0.2, the problem of avoiding image distortion at low gray scale can be achieved, and flicker can be prevented. Of course, Q and W may not be equal.
As shown in fig. 4, in some embodiments of the present disclosure, the illuminance of the ambient light detected by the sensing device is compared with the upper comparison value of the kth ambient light level, if ALS Data ≥ALS Data(k+1) (1+q), then the k+1-th lookup table is used as the target lookup table, and the ambient illuminance is no longer compared to the lower comparison value of the kth ambient light level.
If ALS Data ＜ALS Data(k+1) (1+Q) and comparing the ambient illuminance with the lower comparison value of the kth ambient light level, if ALS Data ≥ALS Data(k-1) (1+W) then the k-1 look-up table is used as the target look-up table.
Furthermore, as shown in fig. 4, in some embodiments of the present disclosure, based on the comparison process described above, there may be the following steps:
if ALS Data ≥ALS Data(m+1) (1+q), the kth lookup table is maintained as the target lookup table.
If ALS Data ≤ALS Data0 (1-W), the kth lookup table is maintained as the target lookup table.
That is, in ambient light ALS Data Extremely low or extremely high, indicating that there may be an error in the data, the current target lookup table may be maintained unchanged, continuing the comparison process above.
It should be noted that, since the display device has a plurality of sub-pixels with different colors, the above-mentioned lookup table and the target brightness thereof exist for each color, that is, the initial gray scale of the display data includes the initial gray scales of the plurality of colors, and the initial gray scales of the sub-pixels with the same color are located in the same lookup table. Of course, the target gray levels of all the sub-pixels may also be placed in the same lookup table.
In step S40, the above-mentioned target brightness is not the brightness controlled by the voltage of the pixel electrode when the display device finally displays the image, that is, the target brightness is not the brightness finally executed, but the control circuit is based on one conversion of the brightness corresponding to the initial gray scale, after obtaining the target brightness, the control device may send the target brightness to the timing controller 34, and the timing controller 34 may control the gamma circuit and the source driving circuit to generate the execution brightness, and then convert the execution brightness into the voltage of the pixel electrode, so as to realize controlling the display panel 1 to display the target image according to the target brightness. In this process, gamma correction may be performed on the target luminance by the gamma circuit, that is, a specified luminance corresponding to each target luminance is determined at the first gamma. That is, the display device of the present disclosure and the image display method thereof perform gamma correction twice, the first time the conversion of display data by the control circuit 3 and the second time the conversion by the gamma circuit and the source driving circuit.
It should be noted that although the various steps of the image display method of the present disclosure are depicted in a particular order in the figures, this does not require or imply that the steps must be performed in that particular order or that all of the illustrated steps be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (15)

1. A display device, comprising:
a display panel including a plurality of sub-pixels;
the photosensitive device is arranged on the display panel and used for detecting the illuminance of the ambient light;
the control circuit is used for determining target brightness of each sub-pixel in a plurality of colors according to the ambient light brightness reflected by the display panel and the acquired initial display data, and controlling the display panel to display a target image according to the target brightness; the initial display data comprises initial gray scales of each sub-pixel in a plurality of colors; the ambient light level, the initial gray level, and the target brightness satisfy the following formula:
L j is the target brightness at j gray levels, and j e (0, 2) n -1)；L max Maximum brightness of the display panel; l (L) AK Is the ambient light level; j (J) AK Gray scale of the ambient light brightness under the first gamma; gamma_o is the first gamma; gamma_pk is the second gamma; n is a positive integer.
2. The display device according to claim 1, wherein the ambient illuminance and the ambient light luminance satisfy the following formula:
L A ＝S·ALS Data ；(3)
L A is the ambient light level; ALS (ALS) Data The ambient illuminance; s is a slope coefficient.
3. The display device of claim 1, wherein the ambient light illumination is an average of at least a portion of a plurality of illumination sample values detected by the light sensing device.
4. The display device of claim 1, wherein the control circuit presets a plurality of look-up tables, any one of the look-up tables comprising 2 n At least part of the objects in different look-up tablesThe brightness is different; different ones of the look-up tables correspond to different ones of the ambient light levels.
5. The display device of claim 1, further comprising a bezel surrounding an edge of the display panel, the bezel having light holes;
the photosensitive device is arranged in the frame and corresponds to the light hole.
6. The display device of claim 5, wherein the bezel is provided with a neutral-attenuation sheet covering the light-transmitting aperture.
7. An image display method of a display device, wherein the display device comprises a display panel, and the display panel is provided with a plurality of sub-pixels; the image display method comprises the following steps:
detecting the ambient illuminance of the environment in which the display panel is positioned;
determining the brightness of the ambient light reflected by the display panel according to the ambient illuminance;
determining target brightness of each sub-pixel according to the ambient light brightness; the target brightness satisfies the following formula:
L j is the target brightness at j gray levels, and j e (0, 2) n -1)；L max Maximum brightness of the display panel; l (L) AK Is the ambient light level; j (J) AK Gray scale of the ambient light brightness under the first gamma; gamma_o is the first gamma; gamma_pk is the second gamma; n is a positive integer;
and controlling the display panel to display a target image according to the target brightness.
8. The image display method according to claim 7, wherein an illuminance of an ambient light of an environment in which the display panel is located is detected; comprising the following steps:
detecting the ambient light for multiple times to obtain multiple ambient light sampling values;
and taking the average value of at least a part of the ambient light sampling values as ambient light illumination.
9. The image display method according to claim 8, wherein an average value of at least a part of the ambient light sampling values is taken as ambient light illuminance; comprising the following steps:
calculating the average value and standard deviation of each ambient light sampling value;
calculating an average value of the ambient light sampling values in the designated interval as ambient light illuminance;
the specified interval is (mu-2σ, mu+2σ);
mu is the average value of all the ambient light sampling values; σ standard deviation of each of the ambient light sample values.
10. The image display method according to claim 7, wherein the brightness of the ambient light reflected by the display panel is determined according to the illuminance of the ambient light; comprising the following steps:
calculating the brightness of the ambient light reflected by the display panel according to the ambient illuminance and the formula (3); equation (3) is as follows:
L A ＝S·ALS Data ；(3)
L A is the ambient light level; ALS (ALS) Data Illuminance for the ambient light; s is a slope coefficient.
11. The image display method according to claim 7, wherein a target luminance of each of the sub-pixels is determined according to the ambient light luminance; comprising the following steps:
according to the ambient light brightnessSelecting a lookup table corresponding to the ambient light brightness from a plurality of lookup tables as a target lookup table; the lookup table comprises 2 n -1 luminance, the luminance of the target look-up table being the target luminance; at least some of the brightnesses in different look-up tables are different.
12. The image display method according to claim 11, characterized in that the image display method further comprises:
setting up m incremental ambient light brightness and m+1 incremental ambient light illumination, taking the kth ambient light illumination as a lower comparison value of the kth ambient light brightness, and taking the kth+1 ambient light illumination as an upper comparison value of the kth ambient light brightness; the lookup table corresponding to the kth ambient light level is the kth lookup table; m is more than or equal to k is more than or equal to 1, and m is more than 2;
selecting a lookup table corresponding to the ambient light brightness from a plurality of lookup tables according to the ambient light brightness as a target lookup table; comprising the following steps:
if the current ambient light brightness is the kth ambient light brightness, the target lookup table is the kth lookup table;
comparing the upper comparison value of the ambient illuminance and the kth ambient light brightness in real time, and comparing the lower comparison value of the ambient illuminance and the kth ambient light brightness in real time;
if ALS Data ≥ALS Data ( k+1) (1+q), then taking the k+1-th lookup table as the target lookup table;
ALS Data illuminance for the ambient light; ALS (ALS) Data ( k+1) K+1th ambient illuminance;
0.5＞Q＞0。
13. the image display method according to claim 12, characterized in that the image display method further comprises: if ALS Data ≤ALS Data ( k-1) (1-W), using a k-1 lookup table as the target lookup table;
ALS Data ( k-1) is the k-1 ambient illuminance; 0 > W > 0.5.
14. The image display method according to claim 13, wherein q=w=0.2.
15. The image display method according to claim 13, characterized in that the image display method further comprises:
if ALS Data ≥ALS Data ( m+1) (1+q), maintaining a kth lookup table as the target lookup table;
if ALS Data ≤ALS Data ( m-1) (1-W), a kth lookup table is maintained as the target lookup table.
CN202310802335.4A 2023-06-30 2023-06-30 Display device and image display method Pending CN116778845A (en)

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