CN114420067A - Display panel and display control method - Google Patents

Display panel and display control method Download PDF

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Publication number
CN114420067A
CN114420067A CN202210111265.3A CN202210111265A CN114420067A CN 114420067 A CN114420067 A CN 114420067A CN 202210111265 A CN202210111265 A CN 202210111265A CN 114420067 A CN114420067 A CN 114420067A
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CN
China
Prior art keywords
display
color temperature
ambient
light
display panel
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CN202210111265.3A
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Chinese (zh)
Inventor
王静
何秀凤
李毅
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Lenovo Beijing Ltd
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Lenovo Beijing Ltd
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Priority to CN202210111265.3A priority Critical patent/CN114420067A/en
Publication of CN114420067A publication Critical patent/CN114420067A/en
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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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

Abstract

The application discloses display panel and display control method, wherein, display panel includes: a display pixel array for generating display information in response to a display drive instruction; at least one or more light sensing units for acquiring ambient light data; the photosensitive units and the display pixel array are arranged on the same substrate; a processing unit for determining an ambient color temperature based on the ambient light data; and the display controller is used for determining a target color temperature corresponding to the display information based on the ambient color temperature so that the display color temperature parameter in the display driving instruction is matched with the target color temperature.

Description

Display panel and display control method
Technical Field
The present disclosure relates to electronic devices, and particularly to a display panel and a display control method.
Background
In the process of displaying information by a display panel of the electronic equipment, the color temperature of the display panel is an important parameter influencing the viewing comfort, and the closer the color temperature of the display panel is to the color temperature of the environment, the better the viewing comfort is.
However, in order to obtain the ambient color temperature, an additional ambient color temperature sensor needs to be added to the electronic device, so that the structure of the electronic device becomes complicated, and the device cost is increased.
Disclosure of Invention
In view of the above, the present application provides a display panel and a display control method, including:
a display panel, comprising:
a display pixel array for generating display information in response to a display drive instruction;
at least one light sensing unit for acquiring ambient light data;
the photosensitive units and the display pixel array are arranged on the same substrate;
a processing unit for determining an ambient color temperature based on the ambient light data;
and the display controller is used for determining a target color temperature corresponding to the display information based on the environment color temperature so as to enable the display color temperature parameter of the display driving instruction to be matched with the target color temperature.
Optionally, the photosensitive unit includes: the photosensitive thin film transistor comprises a photosensitive layer and a thin film transistor, and the photosensitive thin film transistor and the thin film transistor corresponding to each pixel in the display pixel array are arranged on the same substrate.
Optionally, the method further comprises: the light filtering film is covered above the photosensitive thin film transistor and is used for filtering light signals outside a gaze waveband and transmitting the filtered light signals to the photosensitive thin film transistor.
Optionally, the method further comprises: and the black matrix is arranged on the same layer with the filter coating.
Optionally, the processing unit comprises: the device comprises an analog-to-digital converter and a calculation subcomponent, wherein the analog-to-digital converter is used for converting a photocurrent corresponding to the ambient light data into a voltage signal, and the calculation subcomponent is used for determining an ambient color temperature based on the voltage signal.
Optionally, the display panel further comprises:
the gamma chip is connected with the display controller, is connected with the display pixel array and is used for generating gamma voltage so as to control the display color temperature through the gamma voltage;
the display controller stores mapping data of gamma voltages corresponding to the ambient color temperature and the display color temperature.
A display control method comprising:
acquiring ambient light data based on a photosensitive array of a display panel;
determining an ambient color temperature based on the ambient light data;
the display controller for controlling the display panel determines a target color temperature of information to be displayed of a display pixel array of the display panel based on the environmental color temperature, so that the display pixel array displays the information to be displayed at the target color temperature;
the photosensitive units and the display pixel array are arranged on the same substrate.
Optionally, the determining an ambient color temperature based on the ambient light data comprises:
determining the position relation between the photosensitive unit and the display pixel array;
based on the position relation, preprocessing the environment light data to obtain target light data, wherein the preprocessing at least comprises filtering emission light signals of the display pixel array;
based on the target light data, an ambient color temperature is determined.
Optionally, the determining an ambient color temperature based on the ambient light data comprises:
controlling the photosensitive unit to obtain red light and blue light obtained after filtering light by a filter film based on the display panel;
determining the red light brightness corresponding to the red light and the blue light brightness corresponding to the blue light;
determining a photocurrent based on the red and blue light brightness;
the photocurrent is converted into a voltage signal, and an ambient color temperature is determined based on the voltage signal.
Optionally, the determining, by the display controller controlling the display panel, the target color temperature corresponding to the display information based on the ambient color temperature includes:
a display controller for controlling the display panel determines a gamma voltage parameter matched with the ambient color temperature;
and controlling the display panel to adjust to a target color temperature matched with the ambient color temperature based on the gamma voltage parameter.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
FIG. 2 is a partial sectional view of a glass substrate corresponding to a TFT-LCD according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a photosensitive unit according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram illustrating a corresponding relationship between a ratio of blue light to red light response values and a color temperature according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of an embodiment of the present application showing a color temperature self-adjustment of a display panel;
fig. 6 is a flowchart illustrating a display control method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a display panel, can be along with the change of the colour temperature of ambient light, automatically regulated shows the colour temperature, has promoted display panel's display effect.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure. The display panel 10 includes a display pixel array 101, at least one light sensing unit 102, a processing unit 103, and a display controller 104.
It should be noted that fig. 1 is only a schematic diagram for illustrating structural features of the display panel, and does not represent specific structures of all display panels, and components therein may be flexibly configured or laid out based on specific application scenarios of the display panels. In the embodiment of the present invention, the light sensing unit 102 and the display pixel array 101 are disposed on the same substrate 105. The substrate may include a transparent substrate, which may be a glass substrate, a plastic substrate, an insulating substrate such as crystal, and a non-transparent substrate, which may be a silicon substrate, a printed circuit board, a metal substrate, etc. Since the embodiments of the present application are applicable to general electronic devices, and most of the display panels of the electronic devices employ glass substrates, for convenience of description, the substrates are described using glass substrates in the embodiments of the present application.
Display pixel array 101 includes a plurality of display pixels, which are typically formed by a plurality of rows and columns. In one implementation, the spacing between any two adjacent display pixels in the array of display pixels is equal. A certain spatial gap, referred to as a void, may exist between any two display pixels. The display pixel array generates display information in response to a display driving instruction. Wherein the display driving command may originate from a display controller in the display panel.
In one implementation, the display pixel array includes a plurality of pixel units, each pixel unit includes a plurality of sub-pixels with different colors, each sub-pixel includes a Thin Film Transistor (TFT) and a pixel electrode, and the TFT is configured to generate a corresponding voltage signal based on a display driving instruction generated by the display controller and transmit the voltage signal to the pixel electrode, so that the pixel electrode controls a display gray scale of the corresponding sub-pixel, and the display pixel array generates display information and displays the display information.
The photosensitive unit 102 may include one or more photosensitive elements, each of which may be a photosensitive sensor. The light sensing unit 102 may obtain ambient light data of an environment where the display panel is located based on the light sensing sensor. In one embodiment, the photosensitive unit 102 includes photosensitive elements that can be disposed in the gaps between the display pixels in the display pixel array, so that the original structure of the display panel is not changed, and the display panel is lighter and thinner. In another embodiment, the light sensing unit may be layered with the display pixel array, or the light sensing unit may be disposed in an edge region of the display pixel array in order to reduce an influence of the display pixel array on the detection light of the light sensing unit. For example, the light sensing unit is disposed in an edge area of a target area corresponding to the display pixel array in the display panel. The ambient light data collected by the light sensing unit 102 may include color data of red light R, green light G, and blue light B in the ambient light. Further, RGB values of the ambient light may be obtained, such as red light intensity and blue light intensity values in the ambient light. In the embodiment of the application, the light sensing unit is arranged in the display panel and is arranged on the same substrate with the display pixel array, so that an additional light sensing sensor is not required to be added on the electronic equipment, the structure of the electronic equipment is simpler, the light sensing unit is embedded into the display panel, and the color temperature sensing and self-adjusting functions under a screen can be realized.
The processing unit 103 in the display panel 100 is a processor having a data processing function, such as analog-to-digital conversion of data, calculation of a current voltage value, and the like. Such that the processing unit may determine the ambient color temperature based on the ambient light data.
The display controller 104 of the display panel is used for generating control instructions for relevant components in the display panel, such as adjustment instructions of display parameters, switching instructions of display modes, and the like. In this embodiment, the display controller 104 may adjust the display color temperature of the display pixel array to a target color temperature that matches the ambient color temperature based on the ambient color temperature. That is, an adjustment instruction for adjusting the display color temperature is generated by the display controller 104, and the adjustment instruction includes a target color temperature to which the display color temperature is to be adjusted. Therefore, mapping data of the ambient color temperature and the display color temperature can be stored in the storage area corresponding to the display controller, that is, after the ambient light data is acquired through the light sensing unit and the ambient color temperature is obtained based on the processing unit, the display controller can determine a target color temperature corresponding to the ambient color temperature based on the real-time ambient color temperature, so that the display color temperature of the display panel is adjusted, and the display pixel array displays the data based on the target color temperature. Thereby obtaining the information displayed by the display panel to be matched with the ambient light. For example, under the warm tone environment, display panel can show warm look according to the circumstances, and under the cool tone environment, display panel shows can cool look partially to display effect and user's experience effect have been promoted. In the embodiment of the application, the display color temperature is adjusted through the display controller of the display panel, and the adjustment can be completed without a system processor of the electronic equipment, so that the processing efficiency is improved.
The display panel of the embodiment of the present application will be described below by taking a thin film transistor liquid crystal display (TFT-LCD) as an example. Each liquid crystal pixel point on the display screen corresponding to this type of display is driven by a Thin Film Transistor (TFT) integrated behind the pixel point. The thin film transistor liquid crystal display comprises a liquid crystal panel and a backlight plate, wherein the liquid crystal panel is a display panel in the embodiment of the application, and can comprise a polaroid, a glass substrate, a color filter film, an electrode, liquid crystal and an orientation layer. The display pixel array and the photosensitive unit are arranged on the glass substrate. The photosensitive unit is formed by using a TFT (thin film transistor), and may be formed by adding a photosensitive layer between the TFT and a transparent electrode.
In one implementation, a photosensitive unit in a display panel includes a photosensitive thin film transistor including a photosensitive layer and a thin film transistor. The photosensitive thin film transistor and the thin film transistor corresponding to each pixel in the display pixel array are arranged on the same substrate. Since the display pixel array may also include a thin film transistor, in the embodiment of the present application, the light sensing unit may be generated based on the thin film transistor in the display pixel array, that is, a light sensing layer is added between the thin film transistor and the transparent electrode to form a light sensing thin film transistor, and the light sensing thin film transistor senses light of ambient light on the surface of the display panel to obtain ambient light data. The photosensitive layer is a film layer formed by coating photosensitive liquid on the surface of a corresponding element and drying.
Further, in order to reduce the light emitting signal generated by the pixel units in the display pixel array when displaying the display information, the influence on the photosensitive units is reduced. The light sensing thin film transistor may be disposed at a target location on the substrate, for example, at an edge region of the thin film transistor corresponding to each pixel in the display pixel array.
In one implementation, the display panel further includes: the light filtering film is covered above the photosensitive thin film transistor and is used for filtering light signals outside a gaze waveband and transmitting the filtered light signals to the photosensitive thin film transistor. The filter film is a film layer that attenuates light intensity or changes spectral components, and is mainly used to reduce or increase color temperature, change wavelength, block unwanted light, change color, and the like. For example, the target light band is a band corresponding to the blue light signal, i.e., the filter film filters out light signals other than the blue light signal; the target light wave band is the wave band corresponding to the red light signal, namely the light filter film filters the light signals except the red light signal.
Correspondingly, the ambient color temperature can be estimated by a two-color method (i.e., measuring the ratio of blue light to red light). Therefore, the infrared cut filter film can be covered above the photosensitive thin film transistor. A red narrow-band filter film and a blue narrow-band filter film are respectively arranged above the photosensitive thin film transistors in the photosensitive units corresponding to the red and blue photoreceptions. This can cause the light sensing unit including the light sensing thin film transistor to detect the intensity of red light and blue light in the ambient light.
In an implementation manner of the embodiment of the present application, the display panel further includes: and the black cloth is arranged on the same layer as the filter coating.
In general, in a display panel, an upper sealing substrate (also referred to as a color filter substrate) and a black matrix (also referred to as a light shielding substrate) are provided at positions corresponding to boundaries between pixel regions in order to improve contrast. Among them, the sealing substrate may be formed of glass or the like, and the stacked structure formed in the display region is sealed. On the sealing substrate, in a pixel region corresponding to each pixel unit of the display pixel array, color filters (e.g., a red filter, a green filter, and a blue filter) having colors of each pixel are provided. Specifically, the black matrix can divide the sub-pixels in each pixel unit, for example, the black matrix is formed between longitudinally adjacent sub-pixels and is not formed between laterally adjacent sub-pixels, and therefore, the black matrix is formed on the upper and lower sides of each sub-pixel, that is, the black matrix is disposed on the boundary of the sub-pixel corresponding to the display pixel array. It should be noted that the above-mentioned positional relationship between the black matrix and the display pixel array is only an example in the embodiment of the present application, and specifically, the positional relationship may be set according to the display characteristics of the display panel in an actual application scenario. Further, the black matrix may be provided at a boundary portion between the color filters having the respective colors, or the black matrix may be provided at the same layer as the color filters.
Referring to fig. 2, a partial sectional structure diagram of a glass substrate corresponding to a tft-lcd according to an embodiment of the present invention is shown, and it should be noted that fig. 2 only shows a partial sectional structure of the glass substrate of the tft-lcd, and not all the sectional structures. Fig. 2 is a diagram for explaining only the positional relationship between the black matrix and the color filter, and showing the positions of one set of the black matrix and the color filter, and the structure of the other elements provided on the substrate or the elements having a positional correspondence with the substrate is not shown. In fig. 2, a black matrix 201 and a color filter 202 are provided on the same layer of a glass substrate 200. In order to save the manufacturing complexity and maximally not change the layout of the original glass substrate, the filter for the photosensitive cell in the embodiment of the present application may be disposed at the position of the original color filter, that is, the filter and the black matrix are disposed at the same layer.
Referring to fig. 3, a schematic structural diagram of a photosensitive unit according to an embodiment of the present disclosure is shown. The photosensitive unit is a photosensitive thin film transistor, and correspondingly, the photosensitive thin film transistor is disposed on the glass substrate 300, which may include: the color filter 301, the transparent electrode 302, the photosensitive layer 303, the gate electrode 304, the gate insulating layer 305, the active layer 306, the source electrode 307, and the drain electrode 308 are correspondingly arranged as shown in fig. 3. The color filter film is used for filtering light signals outside the non-target wave band. The transparent electrode, the gate insulating layer, the active layer, the source electrode and the drain electrode are all original structures of the thin film transistor, details of the structures are omitted in the embodiment of the application, and the photosensitive layer is added between the thin film transistor and the transparent electrode in the photosensitive unit in the embodiment of the application, namely the photosensitive layer is added between the gate electrode and the transparent electrode of the thin film transistor in the structure shown in fig. 3 and used for detecting ambient photocurrent. The light sensing unit is manufactured by the thin film transistor and embedded into the display panel, and then the color temperature sensing and self-adjusting functions under the screen are achieved. And an external ambient light sensor is not needed, so that the cost is saved, and the structural space is saved.
In order to be able to determine the ambient color temperature, the processing unit in an embodiment of the application comprises: the device comprises an analog-to-digital converter and a calculation subcomponent, wherein the analog-to-digital converter is used for converting a photocurrent corresponding to the ambient light data into a voltage signal, and the calculation subcomponent is used for determining an ambient color temperature based on the voltage signal. As shown in fig. 5, 503 in fig. 5 is a processing unit in the embodiment of the present application, which can implement analog-to-digital conversion and color temperature calculation, and will be specifically described in the embodiment corresponding to fig. 5, which is not described in detail herein.
In this embodiment, the photosensitive unit is provided with a filter film, the filter film may be a color infrared cut-off filter film, the ambient light irradiates the photosensitive layer through the color filter film and the transparent electrode to generate micro-current, the thin film transistor may be turned on, and the brightness of the ambient light is calculated and determined through the on-state current and voltage brightness comparison table of the photosensitive thin film transistor. Obtaining red light brightness and blue light brightness through a photosensitive thin film transistor, and processing photocurrent corresponding to the red light brightness and the blue light brightness into voltage signals through an analog-to-digital converter; the calculation subcomponent may determine the ambient color temperature based on the voltage signal.
Specifically, the brightness of red light and blue light in the ambient light can be calculated based on the voltage brightness comparison table, and the ambient color temperature is estimated by using a two-color method, that is, the ambient color temperature is estimated by measuring the ratio of blue light to red light.
Referring to fig. 4, a schematic diagram of a corresponding relationship between a ratio of blue light to red light response values and a color temperature provided in an embodiment of the present application is shown. As shown in fig. 4, the correspondence between the ratio of the blue light-red response value and the color temperature is nearly linear, and the correspondence can be expressed by a linear function, as shown in equation (1):
TC＝k(B/R)+C (1)
wherein, TCFor the ambient color temperature (as shown by the horizontal axis in fig. 4), B and R are response values of blue light and red light (as shown by the vertical axis in fig. 4), and k and C are empirical coefficients.
It should be noted that, in the embodiment of the present application, the light sensing unit and the display pixel array of the display panel are disposed on the same substrate, and therefore, the light signal generated by the display pixel array may affect the collection of the ambient light by the light sensing unit. When determining the ambient color temperature, the position relation between the photosensitive unit and the display pixel array can be determined; based on the position relation, preprocessing the environment light data to obtain target light data, wherein the preprocessing at least comprises filtering emission light signals of the display pixel array; based on the target light data, an ambient color temperature is determined.
The positions of the light sensing units relative to the display pixel array are different, and the influence of the display pixel array on the light sensing units is different. Specifically, the values of the empirical coefficients k and C in the above equation (1) can be adjusted by the actual positional relationship, so that the calculated ambient color temperature is more accurate.
In another embodiment of the present application, the display panel further includes:
the gamma chip is connected with the display controller, is connected with the display pixel array and is used for generating gamma voltage so as to control the display color temperature through the gamma voltage; the display controller stores mapping data of gamma voltages corresponding to the ambient color temperature and the display color temperature.
Specifically, a display controller for controlling the display panel determines a gamma voltage parameter matched with the ambient color temperature; and controlling the display panel to adjust to a target color temperature matched with the ambient color temperature based on the gamma voltage parameter.
A plurality of color temperature selections may be set according to the storage size corresponding to the memory of the display controller, that is, gamma voltage parameter register configurations corresponding to different color temperatures are written into the storage unit of the display controller, the color temperatures calculated according to the bicolor method may be referred to as shown in table 1, and then the corresponding gamma (gamma) voltages are selected based on the determined target color temperature, so that the display pixel array performs information display at the target color temperature.
For example, the display controller decomposes the color temperature values to obtain three primary color parameters, which are divided into red component intensity, blue component intensity, and green component intensity. And the display controller correspondingly adjusts the red component intensity, the blue component intensity and the green component intensity in the current display screen parameters of the terminal according to the color temperature value corresponding to the target color temperature. For example, after the target color temperature is obtained according to the obtained corresponding relationship between the color temperature value of the light in the environment and the color temperature value of the display panel, the gray scale value corresponding to each color component in each pixel in the Gamma parameter in the initialization code of the display screen driving software can be adjusted according to the target color temperature value, so that the color components of the three primary colors can be adjusted, and the color temperature value of the display panel can be adjusted.
TABLE 1 comparison table of ambient color temperature and display color temperature
Display color temperature Ts Ambient color temperature Tc
4000K Tc≤4500K
5000K 4500K≤Tc≤6000K
6500K 6000K≤Tc≤7500K
8000K 7500K≤Tc≤8500K
9300K 8500K≤Tc
Fig. 5 is a schematic diagram of color temperature self-adjustment of an embedded display panel according to an embodiment of the present application. In fig. 5, the light sensing unit is a TFT light sensing element 501, the display controller is a TCON element 504, and the processing unit 503 includes an ADC (analog-to-digital converter) and a color temperature calculation unit (MCU), the current collection unit 502 is connected to the TFT light sensing element, and transmits a photocurrent corresponding to an optical signal collected by the TFT light sensing element to the ADC, and the ADC converts the current signal into a voltage signal and determines an ambient color temperature based on the voltage signal through color temperature calculation. Then, the TCON element 504 determines a target color temperature based on the ambient color temperature and drives a thin film transistor driving circuit (Source IC)506, so that the thin film transistor driving circuit 506 sends a corresponding display driving instruction to the display pixel array, and the display pixel array performs information display at the target color temperature. Also included in fig. 5 is a power supply 505 to provide electrical signals to the display panel. In an actual application scenario, other elements may be added based on the characteristics of the display panel, which is not described in detail in this application.
In the embodiment of the application, the light sensing unit can be generated based on the thin film transistor and is embedded into the display panel, the color temperature sensing and self-adjusting functions under the screen are achieved, the display color temperature of the display panel can be matched with ambient light, the optimal user experience effect is obtained, the external environment facing sensor is not needed, the cost is saved, and the structural space of the display panel is saved.
In another embodiment of the present application, there is also provided a display control method, referring to fig. 6, the method may include the steps of:
s601, acquiring ambient light data based on a photosensitive array of a display panel.
S602, determining the ambient color temperature based on the ambient light data.
S603, a display controller for controlling the display panel determines a target color temperature of display information to be displayed of a display pixel array of the display panel based on the ambient color temperature, so that the display pixel array displays the display information at the target color temperature.
The photosensitive units and the display pixel array are arranged on the same substrate.
Further, the determining an ambient color temperature based on the ambient light data includes:
determining the position relation between the photosensitive unit and the display pixel array;
based on the position relation, preprocessing the environment light data to obtain target light data, wherein the preprocessing at least comprises filtering emission light signals of the display pixel array;
based on the target light data, an ambient color temperature is determined.
In one embodiment, the determining an ambient color temperature based on the ambient light data comprises:
controlling the photosensitive unit to obtain red light and blue light obtained after filtering light by a filter film based on the display panel;
determining the red light brightness corresponding to the red light and the blue light brightness corresponding to the blue light;
determining a photocurrent based on the red and blue light brightness;
the photocurrent is converted into a voltage signal, and an ambient color temperature is determined based on the voltage signal.
Optionally, the determining, by the display controller controlling the display panel, the target color temperature corresponding to the display information based on the ambient color temperature includes:
a display controller for controlling the display panel determines a gamma voltage parameter matched with the ambient color temperature;
and controlling the display panel to adjust to a target color temperature matched with the ambient color temperature based on the gamma voltage parameter.
It should be noted that, in the present embodiment, reference may be made to the corresponding contents in the foregoing for specific implementation of each step of the display control method, and details are not described here.
Correspondingly, in an embodiment of the present application, there is also provided an electronic device, including: the display panel according to the embodiment of the present application may further include a memory, a processor, and other components, and may be flexibly configured based on an actual application scenario.
The electronic equipment can determine the environmental color temperature based on the display panel and adjust the display color temperature of the display panel, so that the display effect of the electronic equipment is improved, and the user experience effect is met.
It should be noted that, for the specific implementation of the display panel of the electronic device in the present embodiment, reference may be made to the corresponding contents in the foregoing, and details are not described here.
The embodiments in the present description 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. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A display panel, comprising:
a display pixel array for generating display information in response to a display drive instruction;
at least one light sensing unit for acquiring ambient light data;
the photosensitive units and the display pixel array are arranged on the same substrate;
a processing unit for determining an ambient color temperature based on the ambient light data;
and the display controller is used for determining a target color temperature corresponding to the display information based on the environment color temperature so as to enable the display color temperature parameter of the display driving instruction to be matched with the target color temperature.
2. The display panel according to claim 1, the light sensing unit comprising: the photosensitive thin film transistor comprises a photosensitive layer and a thin film transistor, and the photosensitive thin film transistor and the thin film transistor corresponding to each pixel in the display pixel array are arranged on the same substrate.
3. The display panel of claim 2, further comprising: the light filtering film is covered above the photosensitive thin film transistor and is used for filtering light signals outside a gaze waveband and transmitting the filtered light signals to the photosensitive thin film transistor.
4. The display panel of claim 3, further comprising: and the black matrix is arranged on the same layer with the filter coating.
5. The display panel of claim 1, the processing unit comprising: the device comprises an analog-to-digital converter and a calculation subcomponent, wherein the analog-to-digital converter is used for converting a photocurrent corresponding to the ambient light data into a voltage signal, and the calculation subcomponent is used for determining an ambient color temperature based on the voltage signal.
6. The display panel of claim 1, further comprising:
the gamma chip is connected with the display controller, is connected with the display pixel array and is used for generating gamma voltage so as to control the display color temperature through the gamma voltage;
the display controller stores mapping data of gamma voltages corresponding to the ambient color temperature and the display color temperature.
7. A display control method comprising:
acquiring ambient light data based on a photosensitive array of a display panel;
determining an ambient color temperature based on the ambient light data;
the display controller for controlling the display panel determines a target color temperature of information to be displayed of a display pixel array of the display panel based on the environmental color temperature, so that the display pixel array displays the information to be displayed at the target color temperature;
the photosensitive units and the display pixel array are arranged on the same substrate.
8. The method of claim 7, the determining an ambient color temperature based on the ambient light data, comprising:
determining the position relation between the photosensitive unit and the display pixel array;
based on the position relation, preprocessing the environment light data to obtain target light data, wherein the preprocessing at least comprises filtering emission light signals of the display pixel array;
based on the target light data, an ambient color temperature is determined.
9. The method of claim 7, the determining an ambient color temperature based on the ambient light data, comprising:
controlling the photosensitive unit to obtain red light and blue light obtained after filtering light by a filter film based on the display panel;
determining the red light brightness corresponding to the red light and the blue light brightness corresponding to the blue light;
determining a photocurrent based on the red and blue light brightness;
the photocurrent is converted into a voltage signal, and an ambient color temperature is determined based on the voltage signal.
10. The method of claim 7, the determining, by the display controller controlling the display panel, a target color temperature corresponding to the display information based on the ambient color temperature, comprising:
a display controller for controlling the display panel determines a gamma voltage parameter matched with the ambient color temperature;
and controlling the display panel to adjust to a target color temperature matched with the ambient color temperature based on the gamma voltage parameter.
CN202210111265.3A 2022-01-29 2022-01-29 Display panel and display control method Pending CN114420067A (en)

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