Display device and color cast improvement method thereof
By setting a temperature detection module and a light-emitting area adjustment component on the OLED display panel, the occlusion area of red, green, and blue sub-pixels is dynamically adjusted, solving the color shift problem caused by temperature changes and improving display quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD
- Filing Date
- 2026-02-13
- Publication Date
- 2026-05-15
AI Technical Summary
Color shift caused by temperature changes in OLED display panels is difficult to compensate for accurately, and existing technologies cannot effectively improve it by adjusting the driving current or voltage.
A temperature detection module and a light-emitting area adjustment component are set on the display panel. The occlusion area of the red, green and blue sub-pixels is adjusted by the light-blocking unit. The light-emitting area of each color sub-pixel is dynamically adjusted according to the temperature data to compensate for the color coordinate offset.
It achieves accurate compensation for temperature changes, improves the color shift phenomenon of the display panel, and enhances display quality and stability.
Smart Images
Figure CN122050299A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, specifically to a display device and a method for improving color deviation therefrom. Background Technology
[0002] Organic light-emitting diode (OLED) display panels use organic light-emitting materials as the light-emitting layer. Images are displayed by driving the organic light-emitting materials to emit light through an electric current. OLED display panels typically include red, green, and blue sub-pixels. These three colors of sub-pixels are arranged in a specific pattern to form a pixel unit. Color display is achieved by controlling the luminous intensity of different colored sub-pixels.
[0003] The luminescent properties of organic light-emitting materials (OLEDs) in OLED display panels are easily affected by temperature. When the operating temperature of the display panel changes, the luminous efficiency and emission spectrum of the organic light-emitting materials change accordingly, causing a shift in the color coordinates of the displayed image, i.e., color cast. Specifically, when the temperature rises, the emission spectrum of the organic light-emitting materials shifts towards longer wavelengths, resulting in an increase in the color coordinate CIEx value of the display panel, manifested as a reddish tint in the displayed image; when the temperature decreases, the emission spectrum of the organic light-emitting materials changes accordingly, resulting in an increase in the color coordinate CIEy value, manifested as a deviation of the displayed image from the target white point. This temperature-induced color cast affects the display quality of the display panel.
[0004] Existing OLED display panels typically compensate for the effects of temperature changes on luminescence characteristics by adjusting the driving current or driving voltage. This method modulates the luminescence intensity by changing the electrical signal applied to the organic light-emitting diode (OLED) in order to achieve color compensation. However, because the luminescence spectrum characteristics of organic light-emitting materials change complexly at different temperatures, and different color sub-pixels exhibit different temperature response characteristics, adjusting the driving signal alone is insufficient to accurately compensate for color coordinate shifts, resulting in limited color shift improvement.
[0005] Therefore, it is necessary to propose a new technical solution to solve the above-mentioned technical problems. Summary of the Invention
[0006] The purpose of this application is to provide a display device and a method for improving the color deviation of the display device caused by temperature changes.
[0007] This application provides a display device, the display device including a display panel, the display panel including: a plurality of pixel units; a temperature detection module configured to detect the temperature of the display panel and output temperature data; a light-emitting area adjustment component disposed on the light-emitting side of the pixel units, the light-emitting area adjustment component including a light-shielding unit configured to adjust the area of the light-emitting area of the pixel units; and a control module electrically connected to the temperature detection module and the light-emitting area adjustment component, the control module being configured to control the light-emitting area adjustment component to adjust the shielding area of the light-shielding unit according to the temperature data.
[0008] In the above-mentioned display device, the pixel unit includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The light-emitting area adjustment component includes a plurality of light-shielding units corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel, respectively. The control module is configured to adjust the shading area of the light-shielding units located on the light-emitting side of the red sub-pixel, the green sub-pixel, and the blue sub-pixel according to the temperature data.
[0009] In the above-described display device, the control module is configured to control at least one of the light-blocking units corresponding to the red sub-pixel and the light-blocking units corresponding to the blue sub-pixel to increase the blocking area when the temperature data indicates that the temperature is rising.
[0010] In the above-described display device, the control module is configured to control the light-blocking unit corresponding to the green sub-pixel to increase its blocking area when the temperature data indicates a decrease in temperature.
[0011] In the above-mentioned display device, the temperature detection module includes multiple temperature sensors distributed in the display area of the display panel, and the multiple temperature sensors are distributed in an array on the display panel; the display panel also includes multiple analog-to-digital converters, and each of the multiple temperature sensors is electrically connected to the control module through one of the analog-to-digital converters, and the analog-to-digital converters are configured to convert the analog signals collected by the temperature sensors into digital signals and transmit them to the control module.
[0012] In the above-mentioned display device, the control module is configured to read preset temperature-to-light-emitting area ratio correspondence data, the correspondence data including the mapping relationship between temperature and target occlusion area parameters of red sub-pixels, green sub-pixels and blue sub-pixels; the control module is configured to find the corresponding target occlusion area parameter from the correspondence data according to the temperature data, and control the light-emitting area adjustment component according to the target occlusion area parameter.
[0013] In the above-described display device, the light-blocking unit is configured to adjust the blocking area of the pixel unit within a range of 0 to a preset ratio, and the maximum adjustable light-emitting area of the light-emitting area adjustment component is equal to the area of the light-emitting region of the pixel unit.
[0014] In the aforementioned display device, the light-shielding unit is configured to adjust the shading area by mechanical movement or physical shape change.
[0015] This application also provides a method for improving color shift in a display device. The display device includes a pixel unit, a temperature detection module, a light-emitting area adjustment component, and a control module. The light-emitting area adjustment component includes a light-shielding unit. The method includes: acquiring temperature data of the display panel; obtaining target occlusion area parameters of red, green, and blue sub-pixels corresponding to the temperature data from preset temperature-to-light-emitting area ratio correspondence data based on the temperature data; generating a control signal based on the target occlusion area parameters; and sending the control signal to the light-emitting area adjustment component to drive the light-shielding unit to adjust to the occlusion area corresponding to the target occlusion area parameters.
[0016] In the above-described color shift improvement method, the step of obtaining the target occlusion area parameters of the red, green, and blue sub-pixels corresponding to the temperature data from a preset correspondence data of temperature and light-emitting area ratio based on the temperature data includes: when the temperature data indicates an increase in temperature, retrieving and obtaining at least one of the target occlusion area parameters of the red sub-pixel and the blue sub-pixel corresponding to a larger occlusion area from the correspondence data; and when the temperature data indicates a decrease in temperature, retrieving and obtaining the target occlusion area parameter of the green sub-pixel corresponding to a larger occlusion area from the correspondence data.
[0017] The display device provided in the embodiments of this application provides a light-emitting area adjustment component on the light-emitting side of the pixel unit. This component includes a light-shielding unit, a temperature detection module that detects the temperature of the display panel and outputs temperature data, and a control module that controls the light-emitting area adjustment component to adjust the shading area of the light-shielding unit based on the temperature data. This technical solution directly adjusts the actual light-emitting area of the pixel unit at a physical level, rather than changing the luminous intensity of the organic light-emitting material by adjusting the driving signal. When a temperature change causes a shift in the luminous spectrum of the organic light-emitting material, the control module controls the light-shielding unit to increase or decrease the shading area of a specific color sub-pixel based on the temperature data, thereby changing the actual light-emitting area of that color sub-pixel and adjusting the proportion of that color in the overall display effect. Since the change in the shading area of the light-shielding unit directly changes the effective light-emitting area of the pixel unit, this physical shading method, without changing the luminous characteristics of the organic light-emitting material itself, compensates for the influence of the luminous spectrum shift caused by temperature changes on the color coordinates by adjusting the light-emitting area ratio of the red, green, and blue sub-pixels, thereby improving the color shift phenomenon caused by temperature changes in the display panel.
[0018] This application's technical solution addresses the differences in temperature response among sub-pixels of different colors by adjusting the shading area of the light-shielding units corresponding to red, green, and blue sub-pixels separately through a control module. When the temperature rises, the emission spectrum of the organic light-emitting material shifts towards longer wavelengths, leading to an enhancement of the red component. At this time, the control module controls the light-shielding unit corresponding to the red sub-pixel to increase its shading area, reducing the actual light-emitting area of the red sub-pixel, thereby lowering the proportion of red in the overall display and suppressing the increase in the color coordinate CIEx value. When the temperature decreases, the control module controls the light-shielding unit corresponding to the green sub-pixel to increase its shading area, adjusting the output proportion of the green component and suppressing the increase in the color coordinate CIEy value. This method of adjusting the light-emitting area separately for different color sub-pixels compensates for the different temperature response characteristics of each color sub-pixel. Compared to the existing method of uniformly adjusting the driving signal, this application's technical solution can more accurately compensate for color coordinate shifts and improve color cast phenomena. The control module reads preset data on the correspondence between temperature and light-emitting area ratio, finds the corresponding target occlusion area parameter based on the temperature data output by the temperature detection module, and controls the light-emitting area adjustment component according to this parameter. This control method, based on a pre-established temperature-light-emitting area ratio correspondence, solidifies the proportion of light-emitting area that each color sub-pixel should present at different temperatures through data mapping. This allows the control module to quickly and accurately determine the occlusion area that should be set at the current temperature, improving the response speed and accuracy of color shift compensation.
[0019] The color shift improvement method for display devices provided in this application collects temperature data of the display panel, obtains target occlusion area parameters for red, green, and blue sub-pixels corresponding to the temperature data from a preset correspondence data between temperature and light-emitting area ratio, generates control signals based on the target occlusion area parameters, and sends these control signals to the light-emitting area adjustment component to drive the occlusion unit to adjust to the occlusion area corresponding to the target occlusion area parameters. When the operating temperature of the display panel changes, the method collects temperature data and retrieves the corresponding relationship data to obtain the target occlusion area parameters for each color sub-pixel at the current temperature, then converts these parameters into control signals and transmits them to the light-emitting area adjustment component to drive the occlusion unit to adjust to the target occlusion area. This closed-loop control process based on temperature feedback enables the display device to dynamically adjust the light-emitting area of each color sub-pixel according to the actual operating temperature, compensating for the influence of temperature changes on the emission spectrum, thereby improving the color shift phenomenon caused by temperature changes and enhancing the display quality of the display device under different temperature environments. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of a display device provided in an embodiment of this application.
[0021] Figure 2 A schematic diagram showing the layout of a temperature sensor on a display panel in a display device provided for an embodiment of this application.
[0022] Figure 3 A block diagram of a display device provided for an embodiment of this application.
[0023] Figure 4 A schematic diagram showing the shape of the light-shielding unit in a display device provided for an embodiment of this application.
[0024] Figure 5 This is a schematic diagram illustrating several ways in which a light-shielding unit blocks a pixel unit in a display device provided in an embodiment of this application.
[0025] Figure 6 A circuit diagram of a pixel unit in a display device provided for an embodiment of this application. Detailed Implementation
[0026] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0027] The terms “first,” “second,” and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different technical features. The terms “multiple,” and similar words mean two or more, unless otherwise expressly specified.
[0028] The technical solutions of different embodiments of this application can be combined with each other.
[0029] The embodiments of this application provide a display device, such as an organic light-emitting diode (OLED) display device, a mini-LED display device, or a micro-LED display device. The embodiments of this application are described using an OLED display device as an example.
[0030] like Figure 1 As shown, the display device includes a display panel DP, a timing controller TCON, and a source driver chip SDIC. The timing controller TCON is electrically connected to the display panel DP and the source driver chip SDIC. The display panel DP includes multiple pixel units PX, which are arranged in an array within the display area of the display panel DP. The display panel DP also includes a gate driver circuit GOA, multiple gate lines Pscan(i) / Nscan(i) / Pscan(i-1) / Nscan(i-5), multiple light emission control signal lines EM, multiple data lines Data, multiple first power supply lines VDD, and multiple second power supply lines VSS. The gate drive circuit is configured to scan the pixel unit PX line by line. The gate lines Pscan(i) / Nscan(i) / Pscan(i-1) / Nscan(i-5) are used to transmit the scan signal to the pixel unit PX. The light emission control signal line EM is used to transmit the light emission control signal to the pixel unit PX. The data line Data is used to transmit the data signal to the pixel unit PX. The first power supply line VDD is used to provide a positive power supply voltage to the pixel unit PX. The second power supply line VSS is used to provide a negative power supply voltage to the pixel unit PX.
[0031] A pixel unit (PX) comprises red, green, and blue sub-pixels, which are arranged in a repeating pattern according to a specific geometric rule to form a pixel array. Red sub-pixels include red organic light-emitting diodes (OLEDs), green sub-pixels include green OLEDs, and blue sub-pixels include blue OLEDs. OLEDs serve as the light-emitting devices in the pixel unit PX, and each sub-pixel includes a light-emitting region, which corresponds to the effective light-emitting portion of the OLED's light-emitting layer. For example... Figure 4 As shown, the red, green, and blue sub-pixels are arranged according to a specific geometric pattern, and each sub-pixel has a light-emitting area adjustment component above it.
[0032] like Figure 6As shown, the pixel unit PX also includes a driving circuit for driving the organic light-emitting diode (LED) of the pixel unit PX to emit light. The driving circuit includes a driving transistor T1, a data writing transistor T2, a threshold compensation transistor T3, an initialization transistor T4, a first light-emitting control transistor T5, a second light-emitting control transistor T6, an anode reset transistor T7, a storage capacitor Cst, and a boost capacitor Cboost. The gate of transistor T2 is electrically connected to the current stage (i-th stage) scan signal line Pscan(i), the source of transistor T2 is electrically connected to the data signal line Data, and the drain of transistor T2 is electrically connected to the source of transistor T1. The source of transistor T1 is electrically connected to the drain of transistor T2 and the drain of transistor T5, and the drain of transistor T1 is electrically connected to the source of transistor T3 and the source of transistor T6. The gate of transistor T3 is electrically connected to the current stage scan signal line Nscan(i), the source of transistor T3 is electrically connected to the drain of transistor T1, and the drain of transistor T3 is electrically connected to the gate of transistor T1. The gate of transistor T4 is electrically connected to the scan signal line Nscan(i-5) of the previous stage (stage i-5), the source of transistor T4 is electrically connected to the first initialization voltage terminal VI1, and the drain of transistor T4 is electrically connected to the gate of transistor T1. The gate of transistor T5 is electrically connected to the light emission control signal line EM, the source of transistor T5 is electrically connected to the first power supply voltage terminal VDD, and the drain of transistor T5 is electrically connected to the source of transistor T1. The gate of transistor T6 is electrically connected to the light emission control signal line EM, the source of transistor T6 is electrically connected to the drain of transistor T1, and the drain of transistor T6 is electrically connected to the anode of the organic light-emitting diode (LED). The gate of transistor T7 is electrically connected to the scan signal line Pscan(i-1) of the previous stage, the source of transistor T7 is electrically connected to the second initialization voltage terminal VI2, and the drain of transistor T7 is electrically connected to the anode of the organic light-emitting diode (LED). The first plate of the storage capacitor Cst is electrically connected to the first power supply voltage terminal VDD, and the second plate of the storage capacitor Cst is electrically connected to the gate of transistor T1. The first plate of the boost capacitor Cboost is electrically connected to the current stage scan signal line Pscan(i), and the second plate of the boost capacitor Cboost is electrically connected to the gate of transistor T1. The anode of the organic light-emitting diode (LED) is electrically connected to the drain of transistors T6 and T7, and the cathode of the LED is electrically connected to the second power supply voltage terminal VSS. The driving circuit controls the driving current of the LED by controlling the on and off states of each transistor, thereby controlling the luminous brightness of the pixel unit PX.
[0033] like Figure 2As shown, the display device includes a temperature detection module configured to detect the temperature of the display panel DP and output temperature data. The temperature detection module includes multiple temperature sensors TS distributed within the display area of the display panel DP, arranged in an array. The temperature sensors TS are distributed in the upper, middle, and lower areas of the display panel DP, with multiple temperature sensors TS in each area. The temperature sensors TS are arranged in three rows (upper, middle, and lower), with each row containing three horizontally arranged temperature sensors TS, for a total of nine temperature sensors TS evenly covering the left, middle, and right areas of the display panel DP. The temperature sensors TS are thermistors or other types of temperature sensing elements. The temperature sensors TS are electrically connected to the temperature detection module, and the temperature sensors TS collect real-time temperature signals from different locations on the surface of the display panel DP and transmit them to the temperature detection module for processing.
[0034] like Figure 3 As shown, the display device also includes multiple analog-to-digital converters (ADCs). Each of the multiple temperature sensors TS is electrically connected to the control module via an ADC. The ADCs are configured to convert the analog signals acquired by the temperature sensors TS into digital signals and transmit them to the control module. Four temperature sensors TS are each connected to one ADC, and the outputs of these ADCs are all electrically connected to the inputs of the control module.
[0035] The display device includes a light-emitting area adjustment component disposed on the light-emitting side of a pixel unit PX. In the stacking direction of the display panel DP, the light-emitting area adjustment component is located above the light-emitting layer of the organic light-emitting diode, i.e., on the path of light emission. The light-emitting area adjustment component includes a light-shielding unit LBU, configured to adjust the area of the light-emitting region of the pixel unit PX. The pixel unit PX includes red sub-pixels, green sub-pixels, and blue sub-pixels, and the light-emitting area adjustment component includes multiple light-shielding units LBU corresponding to the red, green, and blue sub-pixels, respectively. Each red sub-pixel has a corresponding light-shielding unit LBU on its light-emitting side, each green sub-pixel has a corresponding light-shielding unit LBU on its light-emitting side, and each blue sub-pixel has a corresponding light-shielding unit LBU on its light-emitting side. Figure 4 As shown, the light-emitting area adjustment component includes a light-blocking unit LBU corresponding to the red sub-pixel, a light-blocking unit LBU corresponding to the green sub-pixel, and a light-blocking unit LBU corresponding to the blue sub-pixel. The light-blocking unit LBU corresponding to the red sub-pixel is used to adjust the occlusion state of the red sub-pixel, the light-blocking unit LBU corresponding to the green sub-pixel is used to adjust the occlusion state of the green sub-pixel, and the light-blocking unit LBU corresponding to the blue sub-pixel is used to adjust the occlusion state of the blue sub-pixel.
[0036] The light-shielding unit (LBU) comprises a dynamic aperture or miniature shutter array based on micro-electro-mechanical system (MEMS) technology. In the stacking direction of the display panel (DP), the LBU is located above the encapsulation layer of the DP and below the polarizer; alternatively, the LBU is located above the pixel defining layer (PDL). An independent LBU is positioned above each red, green, and blue sub-pixel.
[0037] The light-shielding unit (LBU) includes a transparent substrate, a first driving electrode, a second driving electrode, and a light-shielding film layer. The light-shielding film layer can be a movable or deformable film layer. The material of the light-shielding film layer is one of the following: a black resin material, diamond-like carbon (DLC), or a metal film with a blackened surface. The metal film material includes titanium or aluminum alloy. The light-shielding film layer is used to block light emitted by the pixel unit (PX).
[0038] The first driving electrode is fixed on the transparent substrate, and the second driving electrode is mechanically connected to the light-shielding film layer. The light-shielding unit (LBU) adjusts the shading area through electrostatic or piezoelectric actuation. The LBU includes an electrostatic comb drive assembly or a parallel plate capacitive actuation assembly. The control module outputs a control voltage signal to the light-emitting area adjustment assembly based on temperature data, generating electrostatic attraction or repulsion between the first and second driving electrodes. This electrostatic attraction or repulsion drives the light-shielding film layer to undergo micro-displacement in the horizontal direction. Alternatively, the LBU includes multiple light-shielding blades, which form a micro-aperture. The electrostatic attraction or repulsion drives the micro-aperture to open and close. The micro-displacement of the light-shielding film layer or the opening and closing of the micro-aperture changes the physical size of the light-transmitting window above the pixel unit (PX). This change in the physical size of the light-transmitting window allows for continuous or graded adjustment of the actual effective light-emitting area of the pixel unit (PX). Figure 5 As shown.
[0039] The light-shielding unit (LBU) includes an actuator made of an electroactive polymer (EAP) or a piezoelectric ceramic material. The LBU also includes a piezoelectric bicrystalline cantilever beam with a light-shielding film layer attached to it. This film layer is made of the electroactive polymer. When the voltage applied to the first driving electrode or the voltage applied to the second driving electrode changes, the actuator deforms, including elongation, contraction, and bending. This deformation causes the light-shielding film layer to cover or expose the light-emitting area of the pixel unit PX. The control module applies a first voltage to the first driving electrode of the LBU corresponding to the red sub-pixel or a second voltage to the second driving electrode of the LBU corresponding to the red sub-pixel. The voltage difference between the first and second voltages drives the actuator to deform, which in turn moves the light-shielding film layer towards the center of the pixel unit PX. As the light-shielding film layer moves towards the center of the pixel unit PX, the driving current of the organic light-emitting diode remains constant. The light-shielding film layer reduces the actual light-emitting area of the red sub-pixel through physical blocking. Figure 5 As shown.
[0040] The light-blocking unit (LBU) is configured to adjust its blocking area through mechanical movement or physical shape change. The mechanical movement or physical shape change of the LBU is controlled by an electrical signal applied to the driving electrode. The LBU is configured to adjust the blocking area of the pixel unit PX within a range from 0 to a preset ratio. The maximum adjustable light-emitting area of the light-emitting area adjustment component is equal to the area of the light-emitting region of the pixel unit PX. When the blocking area of the LBU is 0, the light-emitting region of the pixel unit PX is fully exposed, and the pixel unit PX emits light with its maximum light-emitting area. As the blocking area of the LBU increases, the effective light-emitting area of the pixel unit PX decreases accordingly.
[0041] like Figure 3 As shown, the display device includes a control module electrically connected to a temperature detection module and a light-emitting area adjustment component. The control module includes a data processing unit (DPU) and a data storage power supply (DMU). The DPU is electrically connected to the outputs of multiple analog-to-digital converters (ADCs), and its outputs are electrically connected to the light-emitting area adjustment component via digital-to-analog converters (DACs). The control module is configured to control the light-emitting area adjustment component to adjust the shading area of the light-shielding unit (LBU) based on temperature data. Specifically, the control module is configured to adjust the shading areas of the LBUs located on the light-emitting sides of the red, green, and blue sub-pixels, respectively, based on the temperature data.
[0042] The control module is configured to read preset temperature-to-light-emitting area ratio correspondence data, which includes the mapping relationship between temperature and target occlusion area parameters of red, green, and blue sub-pixels. The correspondence data also includes the mapping relationship between temperature, color coordinates, brightness, and target occlusion area parameters of red, green, and blue sub-pixels. The control module is configured to look up the corresponding target occlusion area parameter from the correspondence data based on the temperature data, and control the light-emitting area adjustment component according to the target occlusion area parameter.
[0043] The corresponding data is stored in the data storage unit (DMU) electrically connected to the control module. This data records the correspondence between the color coordinates, brightness, red data values (Data-R), green data values (Data-G), and blue data values (Data-B) of the display panel (DP) at different temperatures, as well as the occlusion areas of the red, green, and blue sub-pixels. This data was established by pre-testing the luminous characteristics of the display panel (DP) under different temperature conditions. The corresponding data includes temperature variables, color coordinates CIEx and CIEy values, brightness value LV, red data values (Data-R), green data values (Data-G), blue data values (Data-B), and the occlusion area parameters of the red, green, and blue sub-pixels.
[0044] As shown in Table 1, the corresponding data records the parameter values for each temperature point from 22 degrees Celsius to 31 degrees Celsius. At 25 degrees Celsius, the color coordinate CIEx is 0.303, the color coordinate CIEy is 0.315, the brightness is 500 nits, the red data value Data-R is 1962, the green data value Data-G is 1825, the blue data value Data-B is 2302, the occlusion area of the red sub-pixel is 0, the occlusion area of the green sub-pixel is 0, and the occlusion area of the blue sub-pixel is 0. At this time, the light-blocking unit LBU does not block the light-emitting area of the pixel unit PX. At 22 degrees Celsius, the color coordinates CIEx are 0.308, CIEy is 0.315, the luminance LV is 497 nits, the data value Data-R for red is 1962, the data value Data-G for green is 1810, and the data value Data-B for blue is 2302. The occlusion area of the red subpixel is 0.1, the occlusion area of the green subpixel is 0, and the occlusion area of the blue subpixel is 0.2. At 30 degrees Celsius, the color coordinates CIEx are 0.3029, CIEy is 0.3213, the luminance LV is 505 nits, the data value Data-R for red is 1957, the data value Data-G for green is 1825, and the data value Data-B for blue is 2297. The occlusion area of the red subpixel is 0, the occlusion area of the green subpixel is 0.2, and the occlusion area of the blue subpixel is 0. The corresponding data reflects the adjustment rule of the occlusion area required by each color subpixel when the color coordinates shift due to temperature changes.
[0045]
[0046] Table 1 The control module is configured to increase the shading area of at least one of the light-shielding units (LBUs) corresponding to the red sub-pixel and the light-shielding units corresponding to the blue sub-pixel when the temperature data indicates an increase in temperature. When the operating temperature of the display panel (DP) rises from 25 degrees Celsius to 40 degrees Celsius, the emission spectrum of the organic light-emitting material shifts towards longer wavelengths, and the color coordinate CIEx value increases from 0.303 to 0.323, causing the display panel (DP) to exhibit a reddish tint. The temperature sensor (TS) detects that the temperature of the display panel (DP) is 40 degrees Celsius and transmits the temperature signal to the temperature detection module. The temperature detection module transmits the temperature data to the control module via an analog-to-digital converter (ADC). Based on the received temperature data of 40 degrees Celsius, the control module compares the temperature data with the temperature values in the corresponding relationship data and looks up the target shading area parameter corresponding to 40 degrees Celsius. The control module generates a control signal based on the found target shading area parameter and sends the control signal to the light-emitting area adjustment component. After receiving the control signal, the light-emitting area adjustment component drives the light-shielding unit LBU corresponding to the red sub-pixel to increase the shading area, and drives the light-shielding unit LBU corresponding to the blue sub-pixel to increase the shading area. The actual light-emitting area of the red sub-pixel decreases, the actual light-emitting area of the blue sub-pixel decreases, the proportion of red component in the overall display effect decreases, and the color coordinate CIEx value is adjusted from 0.323 to a target value close to 0.315, thereby adjusting the light-emitting area of the red sub-pixel, green sub-pixel and blue sub-pixel.
[0047] The control module is configured to increase the shading area of the light-shielding unit (LBU) of the corresponding green sub-pixel when the temperature data indicates a decrease. When the operating temperature of the display panel (DP) drops from 25 degrees Celsius to 20 degrees Celsius, the luminescent characteristics of the organic light-emitting material change, the color coordinate CIEy value increases, and the color of the display panel (DP) deviates from the target white point. The temperature sensor (TS) detects the temperature decrease of the display panel (DP), and the temperature detection module outputs the corresponding temperature data to the control module. The control module compares the temperature data with the temperature values in the corresponding relationship data, and retrieves the target shading area parameter of the green sub-pixel corresponding to the larger shading area from the corresponding relationship data based on the temperature data. The control module generates a control signal based on the target shading area parameter, which drives the light-shielding unit (LBU) of the corresponding green sub-pixel to increase the shading area. The actual light-emitting area of the green sub-pixel decreases, the proportion of green component in the overall display effect decreases, the color coordinate CIEy value is adjusted, thereby adjusting the light-emitting area of the red, green, and blue sub-pixels.
[0048] Embodiments of this application also provide a method for improving color shift in a display device. The display device includes a pixel unit (PX), a temperature detection module, a light-emitting area adjustment component, and a control module. The light-emitting area adjustment component includes a light-shielding unit (LBU). The color shift improvement method includes: Collect temperature data from the display panel (DP). Based on the temperature data, the target occlusion area parameters of the red, green, and blue sub-pixels corresponding to the temperature data are obtained from the preset temperature-to-light-emitting area ratio correspondence data. Control signals are generated based on the target occlusion area parameters; A control signal is sent to the light-emitting area adjustment component to drive the light-shielding unit (LBU) to adjust to the shading area corresponding to the target shading area parameter.
[0049] The steps for acquiring temperature data from the display panel (DP) include: a temperature sensor (TS) continuously monitors the surface temperature of the DP; the TS transmits the acquired temperature signal to a temperature detection module; the temperature detection module converts the analog temperature signal into digital temperature data using an analog-to-digital converter (ADC); and the digital temperature data is then transmitted to a control module. Upon receiving the temperature data, the control module compares it with the temperature values in the corresponding relational data and searches for the correct value within the relational data.
[0050] The steps for obtaining the target occlusion area parameters of the red, green, and blue sub-pixels corresponding to the temperature data from the preset temperature-to-light-emitting area ratio correspondence data include: When the temperature data indicates that the temperature is rising, retrieve and obtain at least one of the target occlusion area parameters of the red sub-pixel and the target occlusion area parameters of the blue sub-pixel corresponding to the larger occlusion area from the corresponding relationship data; When the temperature data indicates a decrease in temperature, the target occlusion area parameter corresponding to the green sub-pixel with a larger occlusion area is retrieved from the corresponding relationship data.
[0051] The control module compares the retrieved target shading area parameters with the parameters at the current temperature to determine the direction and magnitude of adjustment required for the light-shielding unit (LBU).
[0052] The steps for generating control signals based on the target occlusion area parameters include: the control module calculating the voltage value to be applied to the driving electrode of the light-shielding unit (LBU) based on the target occlusion area parameters; the control module calculating the current value to be applied to the driving electrode of the light-shielding unit (LBU) based on the target occlusion area parameters; the control module converting the calculated voltage value into a control signal; and the control module converting the calculated current value into a control signal. The control signals include the magnitude of the applied voltage, the application time, and the signal waveform. The parameters of the control signals correspond to the occlusion area adjustment amount of the light-shielding unit (LBU).
[0053] The step of sending a control signal to the light-emitting area adjustment component to drive the light-shielding unit LBU to adjust to the shading area corresponding to the target shading area parameter includes: the control module outputs a control signal to the light-emitting area adjustment component, and the control signal is applied to the driving electrode of the light-shielding unit LBU. After receiving the control signal, the driving electrode generates a corresponding electric field force between the first driving electrode and the second driving electrode. The electric field force drives the light-shielding film layer to shift, and the electric field force drives the light-shielding film layer to deform. The shift of the light-shielding film layer changes the shading area of the light-shielding unit LBU on the pixel unit PX, and the deformation of the light-shielding film layer changes the shading area of the light-shielding unit LBU on the pixel unit PX. The light-shielding unit LBU is adjusted to the shading state corresponding to the target shading area parameter, thereby adjusting the light-emitting areas of the red sub-pixel, green sub-pixel, and blue sub-pixel. When the light-blocking unit LBU is adjusted to the target blocking area, the actual light-emitting area of the pixel unit PX changes accordingly. The light-emitting area ratio of the red sub-pixel, green sub-pixel, and blue sub-pixel is adjusted, and the color coordinates displayed on the display panel DP are close to the preset target white point value, thus improving the color shift phenomenon.
[0054] The display device operates as follows: the temperature sensor TS continuously monitors the surface temperature of the display panel DP, the temperature detection module continuously outputs temperature data to the control module, the control module continuously searches for corresponding data based on the real-time received temperature data and obtains the target occlusion area parameter at the current temperature, and the control module continuously adjusts the occlusion area of the light-shielding unit LBU according to the target occlusion area parameter. When the operating temperature of the display panel DP changes, the control module dynamically adjusts the occlusion area of the light-shielding unit LBU of each color sub-pixel according to the temperature change, so that the display panel DP maintains a color coordinate close to the target white point under different temperature environments, thereby improving the color shift phenomenon caused by temperature changes.
[0055] The display device and its color shift improvement method provided in this application, by setting a light-emitting area adjustment component on the light-emitting side of the pixel unit PX, and using a light-shielding unit LBU to physically block the light-emitting area of the pixel unit PX, dynamically adjusts the actual light-emitting area of different color sub-pixels according to temperature changes, compensates for the influence of the emission spectrum shift of organic light-emitting materials caused by temperature changes on color coordinates, improves the color shift phenomenon of the display device caused by temperature changes, and enhances the display quality and stability of the display device under different temperature environments.
[0056] The embodiments of this application have been described in detail above. The content of this specification should not be construed as limiting the scope of protection of this application.
Claims
1. A display device, characterized in that, The display device includes a display panel, the display panel comprising: Multiple pixel units; A temperature detection module, configured to detect the temperature of the display panel and output temperature data; A light-emitting area adjustment component is disposed on the light-emitting side of the pixel unit. The light-emitting area adjustment component includes a light-shielding unit configured to adjust the area of the light-emitting region of the pixel unit that is blocked. The control module is electrically connected to the temperature detection module and the light-emitting area adjustment component. The control module is configured to control the light-emitting area adjustment component to adjust the shading area of the shading unit according to the temperature data.
2. The display device according to claim 1, characterized in that, The pixel unit includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. The light-emitting area adjustment component includes a plurality of light-shielding units corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel, respectively. The control module is configured to adjust the shading area of the light-emitting units located on the light-emitting side of the red sub-pixel, the green sub-pixel, and the blue sub-pixel according to the temperature data.
3. The display device according to claim 2, characterized in that, The control module is configured to control at least one of the light-blocking units corresponding to the red sub-pixel and the light-blocking units corresponding to the blue sub-pixel to increase the blocking area when the temperature data indicates that the temperature is rising.
4. The display device according to claim 2, characterized in that, The control module is configured to control the light-blocking unit corresponding to the green sub-pixel to increase the blocking area when the temperature data indicates a decrease in temperature.
5. The display device according to claim 1, characterized in that, The temperature detection module includes multiple temperature sensors distributed within the display area of the display panel, and the multiple temperature sensors are arranged in an array on the display panel; The display panel also includes multiple analog-to-digital converters. Each of the multiple temperature sensors is electrically connected to the control module through one of the analog-to-digital converters. The analog-to-digital converters are configured to convert the analog signals collected by the temperature sensors into digital signals and transmit them to the control module.
6. The display device according to claim 1, characterized in that, The control module is configured to read preset temperature-to-light-emitting area ratio correspondence data, which includes the mapping relationship between temperature and target occlusion area parameters of red, green and blue sub-pixels; The control module is configured to look up the corresponding target occlusion area parameter from the corresponding relationship data based on the temperature data, and control the light-emitting area adjustment component based on the target occlusion area parameter.
7. The display device according to claim 1, characterized in that, The light-blocking unit is configured to adjust the blocking area of the pixel unit within a range of 0 to a preset ratio, and the maximum adjustable light-emitting area of the light-emitting area adjustment component is equal to the area of the light-emitting region of the pixel unit.
8. The display device according to claim 1, characterized in that, The light-blocking unit is configured to adjust the blocking area by mechanical movement or physical shape change.
9. A method for improving color deviation in a display device, characterized in that, The display device includes a pixel unit, a temperature detection module, a light-emitting area adjustment component, and a control module. The light-emitting area adjustment component includes a light-shielding unit. The method includes: Collect temperature data from the display panel; Based on the temperature data, the target occlusion area parameters of the red, green, and blue sub-pixels corresponding to the temperature data are obtained from the preset temperature-to-light-emitting area ratio correspondence data. A control signal is generated based on the target occlusion area parameter; The control signal is sent to the light-emitting area adjustment component to drive the light-shielding unit to adjust to the shielding area corresponding to the target shielding area parameter.
10. The color cast improvement method according to claim 9, characterized in that, The step of obtaining the target occlusion area parameters of the red, green, and blue sub-pixels corresponding to the temperature data from a preset correspondence data between temperature and light-emitting area ratio based on the temperature data includes: When the temperature data indicates that the temperature is rising, at least one of the target occlusion area parameters of the red sub-pixel and the target occlusion area parameters of the blue sub-pixel corresponding to the larger occlusion area is retrieved from the correspondence data. When the temperature data indicates a decrease in temperature, the target occlusion area parameter of the green sub-pixel corresponding to the larger occlusion area is retrieved from the correspondence data.