Display panel

Abstract

A display panel is provided. The display panel includes: a first sub-pixel, the first sub-pixel including a first light-emitting device that emits light of a first color; a second sub-pixel, the second sub-pixel including a second light-emitting device that emits light of a second color; a first color filter lens, the first color filter lens including a first lens disposed superimposed on the first sub-pixel and a first color filter layer disposed on the surface of the first lens; and a second color filter lens, the second color filter lens including a second lens disposed superimposed on the second sub-pixel and a second color filter layer disposed on the surface of the second lens, wherein the first color filter layer includes a pigment that transmits light of the first color, the second color filter layer includes a pigment that transmits light of the second color, and the transmittance of the second color light of the second color filter layer is lower than the transmittance of the first color light of the first color filter layer.

Description

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10-2025-0010313, filed on January 23, 2025, which is incorporated herein by reference as if fully set forth herein. Technical Field

[0003] This disclosure pertains to display panels. Background Technology

[0004] With the advancement of information technology, the market for display devices, which serve as connection media linking users with information, continues to grow. Consequently, the use of display devices such as light-emitting display devices, quantum dot display (QDD) devices, and liquid crystal display (LCD) devices is increasing.

[0005] Recently, as the aforementioned display devices are used in vehicles, various technologies such as in-panel light control film (LIP) (where light control film using blinds (LCF) or lenses are embedded in the panel) have been used to prevent the light from the display device from obstructing the driver's field of vision.

[0006] In the LIP structure, lenses are respectively placed on sub-pixels that emit light of different colors, and the light emitted from the sub-pixels can be collected by the lenses, thus increasing the brightness.

[0007] However, when light of different colors passes through a lens, the brightness ratio of each color changes differently with respect to the viewing angle. As a result, there is a problem that visibility varies with the same viewing angle at the same color coordinates, which leads to the need to reset the color coordinates. Summary of the Invention

[0008] In order to overcome the above-mentioned problems of the related technologies, the present disclosure provides a display panel that can reduce the brightness variation of each color with respect to the viewing angle in a structure in which lenses are set on sub-pixels.

[0009] To achieve these and other advantages, and for the purposes of this disclosure, as embodied and broadly described herein, a display panel includes: a first sub-pixel including a first light-emitting device emitting light of a first color; a second sub-pixel including a second light-emitting device emitting light of a second color; a first color filter lens including a first lens disposed superimposed on the first sub-pixel and a first color filter layer disposed on a surface of the first lens; and a second color filter lens including a second lens disposed superimposed on the second sub-pixel and a second color filter layer disposed on a surface of the second lens, wherein the first color filter layer includes a pigment that transmits the first color light, the second color filter layer includes a pigment that transmits the second color light, and the transmittance of the second color light of the second color filter layer is lower than the transmittance of the first color light of the first color filter layer.

[0010] The first and second color filter layers include a common first pigment.

[0011] The rate of decrease in brightness of the second color light caused by the first pigment can be greater than the rate of decrease in brightness of the first color light caused by the first pigment.

[0012] Each of the first lens and the second lens may include a lens material, which includes at least one of a polymer-based material and an inorganic material, and each of the first color filter layer and the second color filter layer may include a combination of a first pigment and the lens material.

[0013] The first pigment may include at least one of a green filter pigment and a blue filter pigment, wherein the green filter pigment is selected from at least one of copper phthalocyanine chloride (PG7), PG36 and nickel complex pigment, and the blue filter pigment is selected from at least one of copper phthalocyanine (PB15:3), indigo blue (PB60) and ultramarine blue.

[0014] The outer surface of each of the first and second color filter layers may include a curved surface corresponding to the upper curved surface of the corresponding lens in the first and second lenses.

[0015] The refractive index of the first color filter layer is the same as that of the first lens, and the refractive index of the second color filter layer is the same as that of the second lens.

[0016] The maximum height of each of the first lens and the second lens can be greater than the maximum width of each of the first lens and the second lens.

[0017] The thickness of each of the first and second color filter layers at the side surface of the corresponding lens in the first and second lenses may be greater than the thickness of each of the first and second color filter layers at the center of the upper surface of the corresponding lens in the first and second lenses.

[0018] The brightness reduction rate of the second color light caused by the second color filter layer can be greater at the second viewing angle than at the first viewing angle corresponding to the front of the second light-emitting device, and the second viewing angle is different from the first viewing angle.

[0019] The first color light can be red light, and the second color light can be green light or blue light.

[0020] A first color filter lens disposed on the first sub-pixel can be provided as one, and a second color filter lens disposed on the second sub-pixel can be provided as one.

[0021] The display panel may further include: an encapsulation layer disposed on the first light-emitting device and the second light-emitting device; an optical layer disposed between the encapsulation layer and the first color filter lens and the second color filter lens; and a low-refractive-index layer disposed on the first color filter lens and the second color filter lens, wherein the refractive index of each of the first color filter lens and the second color filter lens may be greater than the refractive index of the low-refractive-index layer.

[0022] The thickness of the optical layer can be less than the maximum height of each of the first and second color filter lenses.

[0023] The thickness of the low-refractive layer can be greater than the maximum height of each of the first and second color filter lenses.

[0024] The display panel may also include a dam defining the light-emitting area of ​​the first sub-pixel and the light-emitting area of ​​the second sub-pixel, wherein the dam may overlap with the space between the first color filter lens and the second color filter lens.

[0025] The display panel may also include a first barrier at the overlapping portion between the encapsulation layer and the optical layer, wherein the first barrier may be a black matrix comprising light-absorbing material.

[0026] The display panel may also include a second barrier at the overlapping portion between the optical layer and the low-refractive layer, wherein the second barrier may be a touch electrode made of metallic material.

[0027] The display panel may further include: a third sub-pixel, the third sub-pixel including a third light-emitting device that emits a third color light; a third color filter lens, the third color filter lens including a third lens disposed superimposed on the third sub-pixel, and a third color filter layer disposed on the surface of the third lens, wherein the third color filter layer includes a pigment that transmits the third color light, and the transmittance of the third color light of the third color filter layer is lower than the transmittance of the first color light of the first color filter layer.

[0028] The brightness reduction rate of the third color light caused by the third color filter layer can be greater at the second viewing angle than at the first viewing angle corresponding to the front of the third light-emitting device, and the second viewing angle is different from the first viewing angle.

[0029] In embodiments of this disclosure, the first color filter layer, the second color filter layer, and the third color filter layer may be disposed on the surfaces of the first lens, the second lens, and the third lens. The first lens, the second lens, and the third lens are disposed on the first sub-pixel, the second sub-pixel, and the third sub-pixel, respectively emitting the first color light, the second color light, and the third color light. Furthermore, the light transmittance of the first color filter layer, the second color filter layer, and the third color filter layer may be different relative to the color light, thereby enhancing the visibility of the display panel.

[0030] Furthermore, in embodiments of this disclosure, the thickness of the color filter layer at the side surface of the lens can be greater than the thickness of the color filter layer at the center of the upper surface of the lens, and thus, the difference between the brightness change of the first color light caused by the increase in viewing angle and the brightness changes of the second and third color lights can be reduced, thereby further enhancing the visibility of the display panel. Attached Figure Description

[0031] The accompanying drawings are included to provide a further understanding of this disclosure and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. In the drawings:

[0032] Figure 1 It is a configuration diagram used to describe the concept of the configuration of a display device according to the present disclosure;

[0033] Figure 2 It is a circuit diagram used to describe an embodiment of a pixel equivalent circuit suitable for a display panel according to the present disclosure;

[0034] Figure 3 It is a cross-sectional view used to describe the structure of a display panel according to an embodiment of the present disclosure;

[0035] Figure 4 It is used to describe Figure 3 A diagram showing the functions of the first to third color filter layers;

[0036] Figure 5 It is used to describe Figure 3 A magnified view showing the thickness variation of the color filter layer in each color filter lens;

[0037] Figure 6A and Figure 6B It is used to describe when the color filter layer has, for example, Figure 5 The graph showing the reduction in brightness of the second and third colors of light relative to the viewing angle when the thickness is within the range; and

[0038] Figure 7 It is a graph used to describe the brightness changes of the first color light to the third color light R, G, and B relative to the viewing angle when the lens set on the sub-pixel is only configured with a transparent lens and no color filter layer. Detailed Implementation

[0039] In the following text, embodiments will be described in detail with reference to the accompanying drawings.

[0040] Similar reference numerals denote similar elements. Furthermore, for ease of description, the thickness, ratios, and dimensions of each element described herein are shown as partially enlarged or reduced. For ease of description, the scale of each element shown in the accompanying drawings of this disclosure may differ from the actual scale, but is not limited to the scale shown in the drawings.

[0041] In this disclosure, when any element (or area, layer, section, etc.) is described as “on,” “connected,” or “coupled,” this may mean that any element can be directly connected to / coupled to another element, or that a third element can be disposed between them.

[0042] The term "and / or" can include all combinations that can be defined by one or more combinations of related elements.

[0043] The terms used in the first and second instances can be used to describe various elements, but the elements should not be limited by the terms. The terms may be used only for the purpose of distinguishing one element from another. For example, without departing from the spirit and scope of the invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. Unless otherwise stated, singular terms may include plural forms.

[0044] The terms “below,” “under,” “above,” and “above” can be used to describe the relationship between elements shown in the accompanying drawings. The terms can be relative concepts and can be described relative to the directions shown in the drawings. For example, one or more other elements may be positioned between two elements unless “only” or “directly” is used. The spatially relative terms “below,” “under,” “below,” “above,” and “above” can be used herein to readily describe the relationship between one device or element as shown in the accompanying drawings and other devices or elements. Thus, for example, with respect to a first element, “below” and “below” can be relative to “above” and “above.”

[0045] It should be understood that spatial relative terms are terms that include different orientations of elements in use or operation, in addition to the orientations shown in the figures. For example, if the device in the figures is flipped, an element described as being "below" or "under" other elements can be placed "above" other elements. Thus, the exemplary term "below" can include both "below" and "above" orientations. Similarly, the exemplary terms "above" or "above" can include both "above" and "below" orientations.

[0046] It should be understood that "include", "comprise", "including" or "comprising" means that the attribute, area, fixed number, step, process, element and / or component is specified, but does not exclude other attributes, areas, fixed numbers, steps, processes, elements and / or components.

[0047] Those skilled in the art will fully understand that the features of the various embodiments of this disclosure can be coupled or combined with each other in part or in whole, and can be technology-driven and interoperable with each other in various ways. Embodiments of this disclosure can be performed independently of each other, or can be performed together in an interdependent relationship.

[0048] In the following description, a display device according to an embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0049] Figure 1 This is a configuration diagram used to describe the concept of configuring a display device according to the present disclosure. Figure 2 This is a circuit diagram used to describe an embodiment of a pixel equivalent circuit suitable for a display panel according to the present disclosure.

[0050] like Figure 1 As shown, the display device 1 according to the embodiments of the present disclosure may include a display panel 10, a timing controller 11, a data driver 12, a gate driver 13, and a power supply 20.

[0051] exist Figure 1In the example shown, the timing controller 11, data driver 12, and power supply 20 are configured separately, but this is not the case with... Figure 1 Unlike other components, some or all of the timing controller 11, data driver 12, and power supply 20 can be integrated into a driver integrated circuit (IC). Figure 1 In this configuration, the data driver 12, the gate driver 13, and the power supply 20 can be configured as a panel driving circuit for driving the display panel 10.

[0052] like Figure 1 In this configuration, the gate driver 13 can be disposed in the non-active region NA of the display panel 10, and in this case, the gate driver 13 can be directly formed on the substrate of the display panel 10 as an in-panel gate driver (GIP) type. However, Figure 1 This can be an implementation method, and the gate driver 13 according to this disclosure is not limited to... Figure 1 .

[0053] The display panel 10 may include an active area AA and an inactive area NA.

[0054] An active region AA can be an area for displaying an image. Multiple subpixels SP can be set within the active region AA, and the active region AA can display an image using these multiple subpixels SP. An area with multiple subpixels SP can be an active region AA, and a non-active region NA can be an area located at the outer edge of the display panel 10 to surround the active region AA and not display an image.

[0055] Multiple subpixels SP are disposed in the active region AA. The multiple subpixels SP may include a first subpixel SPR that emits a first color light, a second subpixel SPG that emits a second color light, and a third subpixel SPB that emits a third color light. For example, the first color light may be red (R) light, the second color light may be green (G) light, and the third color light may be blue (B) light, and this will be described below as an example.

[0056] Multiple sub-pixels SP that emit light of different colors can be grouped into a single unit pixel UP. When the pixel group used for color representation is defined as a unit pixel UP, the unit pixel UP can be configured to include, for example, multiple sub-pixels SPR, SPG, and SPB that emit red (R), green (G), and blue (B) light respectively, and further, can be configured to include sub-pixels emitting white (W) light in addition to red (R), green (G), and blue (B) light. Each unit pixel UP can be mixed with different colors to achieve various colors. In the embodiments described below, the case where multiple sub-pixels SP emit light of different colors (such as red (R), green (G), and blue (B) light) is described as an example.

[0057] exist Figure 1 In the example shown, a unit pixel includes a red sub-pixel SPR that emits red (R) light, a green sub-pixel SPG that emits green light, and a blue sub-pixel SPB that emits blue light. In the following description, the case where the first sub-pixel is the red sub-pixel SPR, the second sub-pixel is the green sub-pixel SPG, and the third sub-pixel is the blue sub-pixel SPB will be described as an example.

[0058] At least one panel driving circuit for driving multiple sub-pixels SP can be set in the non-active region NA.

[0059] The timing controller 11 can receive digital image data D-DATA transmitted from the host system (not shown) to supply digital image data D-DATA to the data driver 12.

[0060] The timing controller 11 can receive timing signals such as vertical synchronization signals, horizontal synchronization signals, data enable signals, and point clocks from the host system to generate timing control signals for the operation timing of the control panel drive circuit.

[0061] The timing control signals may include a gate timing control signal GDC for controlling the operating timing of the gate driver 13, a data timing control signal DDC for controlling the operating timing of the data driver 12, and a power timing control signal PDC for controlling the operating timing of the power supply 20.

[0062] The data driver 12 can be connected to multiple sub-pixels SP via data lines DL (DL1 to DLm). Based on the digital image data D-DATA input from the timing controller 11, the data driver 12 can generate data voltages (which are analog signals required to drive the multiple sub-pixels SP) and can supply the data voltages to the data lines DL respectively.

[0063] The data driver 12 can sample and latch the digital image data D-DATA input from the timing controller 11 based on the data timing control signal DDC to generate parallel data.

[0064] Subsequently, the data driver 12 can convert the digital image data D-DATA into an analog data voltage Vdata using a digital-to-analog converter (DAC) based on the gamma compensation voltage, and can supply the analog data voltage to multiple sub-pixels SP via the data line DL. The analog data voltage can be analog voltage values ​​of different voltage levels to correspond to the image grayscale levels to be represented in the multiple sub-pixels SP.

[0065] The data driver 12 can output data voltages to multiple sub-pixels SP based on the data timing control signal DDC. The data driver 12 may include multiple source driver integrated circuits (ICs). Each of the source driver ICs may include a shift register, a latch, a level shifter, a DAC, and an output buffer.

[0066] The gate driver 13 can generate a scan signal SC based on the gate timing control signal GDC to supply the scan signal SC to multiple sub-pixels SP through the gate lines GL (GL1 to GLn).

[0067] Based on the power timing control signal PDC, the power supply 20 can process the input power to generate a high-level drive voltage EVDD with a fixed level, and can supply the high-level drive voltage EVDD to the display panel.

[0068] like Figure 2 As shown, for example, at least one of the multiple sub-pixels SP may include a switching transistor ST, a driving transistor DT, a capacitor Cst, and a light-emitting device OLED.

[0069] The first electrode of the switching transistor ST can be electrically connected to the data line DL to receive a data voltage, the second electrode of the switching transistor ST can be electrically connected to the first node N1, and the gate electrode of the switching transistor ST can be electrically connected to the gate line GL to receive a scan signal. The switching transistor ST can transmit the data voltage supplied via the data line DL to the first node N1 in response to the scan signal supplied via the gate line GL.

[0070] The first electrode of the driving transistor DT can be supplied with a high-level driving voltage EVDD, and the second electrode of the driving transistor DT can be electrically connected to the first electrode of the light-emitting device OLED. The driving transistor DT can generate a driving current Id flowing in the light-emitting device OLED in response to the voltage applied from the first node N1 to the gate electrode of the driving transistor DT.

[0071] One end of capacitor Cst can be electrically connected to the first node N1, and the other end of capacitor Cst can be electrically connected to the second electrode of the driving transistor DT. Capacitor Cst can be charged using the voltage applied to the first node N1.

[0072] An OLED (Optical Display Panel) can output light corresponding to a driving current Id. An OLED can emit light corresponding to one of the following colors: red (R), green (G), blue (B), and white (W).

[0073] For example, an OLED (Optical Display Panel) device may include an emissive layer that generates light of a single color. The emissive layer can be configured to emit a different color of light for each sub-pixel (SP), such as white (W), red (R), green (G), or blue (B).

[0074] Furthermore, despite Figure 2 Although not shown, a compensation circuit (not shown) for compensating the threshold voltage of the driving transistor DT may also be included in the sub-pixel SP. The compensation circuit may include at least one transistor connected to the driving transistor DT and may be located in the sub-pixel SP.

[0075] Figure 3 This is a cross-sectional view used to describe the structure of the display panel 10 according to an embodiment of the present disclosure, and Figure 4 It is used to describe Figure 3 The diagram shows the functions of the first to third color filter layers.

[0076] like Figure 3 As shown, the display panel 10 may include a substrate 100, an insulating layer 110, a buffer layer 140, a gate insulating layer 150, an interlayer insulating layer 200, a planarization layer 300, a dam 400, a light-emitting device OLED, an encapsulation layer 500, a first barrier BR1, an optical layer 600, a second barrier BR2, multiple color filter lenses CLR, CLG and CLB, a low refractive layer 700 and a quarter-wave plate QWP.

[0077] exist Figure 3 In this context, transistor TR can be one of the switching transistor ST and the driving transistor DT, and transistor TR is... Figure 2 The case of the driving transistor DT is shown as an example. Figure 3 The cross-sectional structure of the display device shown may be an embodiment for understanding the present disclosure, and the embodiments of the present disclosure are not limited thereto.

[0078] The substrate 100 may include a flexible plastic material and may have flexible properties, and in addition, may include a glass material with a flexible thickness.

[0079] The insulating layer 110 can be disposed in the active region AA and the non-active region NA of the substrate 100. The insulating layer 110 can be disposed on the substrate 100 and can protect structures on the substrate 100 that are susceptible to water penetration through the substrate 100. The insulating layer 110 may include one or more inorganic layers of silicon oxide (SiOx), silicon nitride (SiNx), and silicon oxide nitride (SiOxNy).

[0080] The buffer layer 140 may be disposed on the insulating layer 110. The buffer layer 140 may include an inorganic insulating material, such as SiOx or SiNx.

[0081] The transistor TR can be disposed on the buffer layer 140. The transistor TR may include a gate electrode G, an active layer ACT, a source electrode SDa, and a drain electrode SDb.

[0082] The active layer ACT may include a source region AS, a channel region CH, and a drain region AD. The source region AS and the drain region AD may have a higher conductivity than the channel region CH, and the channel region CH may form a channel in response to a voltage applied to the gate electrode.

[0083] The gate insulating layer 150 can be stacked on the buffer layer 140, while covering the active layer ACT. The gate insulating layer 150 can insulate the gate electrode G of the transistor TR from the active layer ACT.

[0084] An interlayer insulating layer 200 may be disposed on the gate insulating layer 150 to cover the gate electrode G of the transistor TR. The source electrode SDa and drain electrode SDb of the transistor TR may be disposed on the interlayer insulating layer 200.

[0085] The source electrode SDa and the drain electrode SDb can pass through the interlayer insulating layer 200 and the gate insulating layer 150, and can contact the source region AS and the drain region AD of the transistor TR.

[0086] The planarization layer 300 can be stacked on the interlayer insulating layer 200 to cover the source electrode SDa and drain electrode SDb of the transistor TR. The planarization layer 300 can remove the step height caused by the driving circuit, and its upper surface can include a flat surface. The planarization layer 300 can include an insulating material with high flexibility.

[0087] One of the source electrode SDa and drain electrode SDb of transistor TR can pass through the planarization layer 300 and can contact the first electrode E1 of the light-emitting device OLED.

[0088] The dam 400 can be set on the planarization layer 300. The dam 400 can define the light emission area of ​​each sub-pixel, and the area of ​​each sub-pixel can be divided by the dam 400.

[0089] The dam 400 may include light-absorbing materials, and for example, may include black pigments such as carbon black. Therefore, the dam 400 can absorb external light and thus minimize light reflectivity, further enhancing black colors and improving contrast and color accuracy, thereby further improving image quality.

[0090] The dam 400 may include an organic insulating material. The dam 400 may cover the edge of the first electrode E1 (e.g., the anode electrode). A light-emitting layer EL and a second electrode E2 (e.g., the cathode electrode) may be stacked on the portion of the first electrode E1 exposed by the dam 400.

[0091] Therefore, the light-emitting area of ​​each of the multiple sub-pixels SPR, SPG, and SPB can be divided by the dike 400. That is, the light-emitting area of ​​each of the multiple sub-pixels SPR, SPG, and SPB can be the area of ​​the first electrode E1 exposed by the dike 400.

[0092] The light-emitting device OLED can be disposed in the light-emitting area and can include a first electrode E1, a light-emitting layer EL, and a second electrode E2. The dam 400 can be configured to spatially overlap with two adjacent color filter lenses among the first to third color filter lenses CLR, CLG, and CLB.

[0093] For example, the first electrode E1 can be used as an anode electrode and can include a conductive material. The first electrode E1 can have high reflectivity. For example, the first electrode E1 can include metals such as aluminum (Al) and silver (Ag). The first electrode E1 can be exposed at the light-emitting area of ​​each sub-pixel by a dike 400.

[0094] The light-emitting layer EL can generate colored light with a brightness corresponding to the voltage difference between the first electrode E1 and the second electrode E2. For example, the light-emitting layer EL included in the first sub-pixel SPR can generate red light R as a first color light R, the light-emitting layer EL included in the second sub-pixel SPG can generate green light G as a second color light G, and the light-emitting layer EL included in the third sub-pixel SPB can generate blue light B as a third color light B.

[0095] Therefore, the light-emitting layer (EL) may include a light-emitting material layer (EML) containing a light-emitting material. The light-emitting material may include organic materials, inorganic materials, or a mixture of materials. For example, the light-emitting layer (EL) may include a light-emitting material layer containing an organic material.

[0096] The light-emitting layer EL may include at least one of a first light-emitting common layer (not shown) disposed between the first electrodes E1 and a second light-emitting common layer (not shown) disposed between the second electrodes E2. Each of the first light-emitting common layer (not shown) and the second light-emitting common layer (not shown) may include at least one of a hole transport layer (HTL) and an electron transport layer (ETL).

[0097] The light-emitting layer EL can be electrically connected to the first to third sub-pixels SPR, SPG, and SPB. For example, a light-emitting material layer EML can be set for each sub-pixel, but the first light-emitting common layer and the second light-emitting common layer (not shown) can be jointly connected to the first to third sub-pixels SPR, SPG, and SPB.

[0098] Therefore, the light-emitting layer EL of the first light-emitting device OLED1 (OLED) included in the first sub-pixel SPR can be electrically connected to the light-emitting layer EL of the second light-emitting device OLED2 (OLED) included in the second sub-pixel SPG.

[0099] For example, the second electrode E2 can be used as a cathode electrode and can include a conductive material. The second electrode E2 can include a material different from that of the first electrode E1. For example, the second electrode E2 can be a transparent electrode comprising conductive materials such as indium tin oxide (ITO) and indium zinc oxide (IZO). The transmittance of the second electrode E2 can be higher than that of the first electrode E1.

[0100] The encapsulation layer 500 can be disposed on the second electrode E2 on the light-emitting layer EL, and can perform the encapsulation function to prevent the light-emitting device OLED from being damaged by external impact or water.

[0101] The encapsulation layer 500 may include alternating layers of inorganic insulating material and organic insulating material. The step height caused by the light-emitting device OLED can be eliminated by the encapsulation layer 500, and the upper surface of the encapsulation layer 500 may be a flat surface.

[0102] An optical layer 600 may be disposed on the encapsulation layer 500. The optical layer 600 may form an upper surface and thus may be used as an optical gap that induces uniform light refraction, thereby improving light extraction efficiency.

[0103] Therefore, the refractive index of the optical layer 600 can be lower than the refractive index of each of the plurality of color filter lenses CLR, CLG, and CLB, and the thickness T600 of the optical layer 600 can be less than the maximum height b of each of the first to third color filter lenses CLR, CLG, and CLB. The optical layer 600 may comprise a polyimide-acrylic acid composite material (PAC).

[0104] The first barrier BR1 can be disposed between the encapsulation layer 500 and the optical layer 600 at the portion overlapping with the dam 400. The first barrier BR1 can prevent color mixing caused by colored light emitted from the light-emitting devices (OLEDs) of adjacent sub-pixels. For example, the first barrier BR1 can be formed of a black matrix including a black pigment as a light-absorbing material.

[0105] The second barrier BR2 can be disposed between the optical layer 600 and the low-refractive layer 700 at the portion overlapping with the dam 400. The edge of the second barrier BR2 can overlap with the edges of the first to third color filter lenses CLR, CLG and CLB.

[0106] The second barrier BR2, together with the first barrier BR1, can perform the function of preventing color mixing caused by colored light emitted from the light-emitting devices (OLEDs) of adjacent sub-pixels. The second barrier BR2 can be a touch electrode made of an opaque metallic material. That is, the second barrier BR2 can be one of a touch driving electrode and a touch receiving electrode.

[0107] As described above, the first barrier BR1 and the second barrier BR2 can prevent light from being collected in the color filter lens of the corresponding sub-pixel due to unnecessary mixing of the color light of adjacent sub-pixels, and can block the viewing angle so that the color light emitted from each sub-pixel does not obstruct the driver's field of vision.

[0108] Multiple color filter lenses CLR, CLG, and CLB can be disposed on optical layer 600 at the portions overlapping with the light-emitting areas of each sub-pixel. For example, a first color filter lens CLR can be disposed overlapping the light-emitting area of ​​the first sub-pixel SPR, a second color filter lens CLG can be disposed overlapping the light-emitting area of ​​the second sub-pixel SPG, and a third color filter lens CLB can be disposed overlapping the light-emitting area of ​​the third sub-pixel SPB.

[0109] Each of the first to third color filter lenses CLR, CLG, and CLB can have a refractive index greater than that of the low-refractive layer 700, and can collect and output the color light emitted by the corresponding sub-pixels from the first to third sub-pixels SPR, SPG, and SPB, thereby enhancing the front brightness of the display panel.

[0110] The first to third color filter lenses CLR, CLG and CLB may each include the first lens L1 to the third lens L3 and the first color filter layer CF1 to the third color filter layer CF3.

[0111] Each of the first lens L1 to the third lens L3 can be configured to overlap with the corresponding sub-pixel among the first to third sub-pixels SPR, SPG and SPB, and can collect the colored light emitted from the corresponding sub-pixel to enhance brightness.

[0112] Each of the first lens L1 to the third lens L3 may not include colored pigments and may include a transparent lens material. The lens material may include at least one of a polymer-based material and an inorganic material. For example, the polymer-based material may include at least one of polymethyl methacrylate (PMMA), polyimide, and epoxy resin, and the inorganic material may include at least one of silicon dioxide (SiO2) and titanium dioxide (TiO2). In addition, the lens material may include a polymer-inorganic composite material.

[0113] The first color filter layer CF1 to the third color filter layer CF3 can be respectively configured to contact the surfaces of the first lens L1 to the third lens L3. The outer surface of each of the first color filter layer CF1 to the third color filter layer CF3 may include a curved surface corresponding to the upper curved surface of the corresponding lens among the first lens L1 to the third lens L3. That is, the curved surface based on the curved surface of each of the first lens L1 to the third lens L3 can be disposed outside the corresponding color filter layer in the first color filter layer CF1 to the third color filter layer CF3.

[0114] The first color filter layer CF1 may include a pigment that transmits a first color light R, the second color filter layer CF2 may include a pigment that transmits a second color light G, and the third color filter layer CF3 may include a pigment that transmits a third color light B.

[0115] Based on the pigments included in the first color filter layer CF1 to the third color filter layer CF3, the transmittance of the color filter layers can be different. Specifically, the transmittance of the second color light G of the second color filter layer CF2 can be lower than the transmittance of the first color light R of the first color filter layer CF1, and the transmittance of the third color light B of the third color filter layer CF3 can be lower than the transmittance of the first color light R of the first color filter layer CF1.

[0116] For example, such as Figure 4 As shown, when the second-color light Gt emitted from the optical axis of the second light-emitting device OLED2 emitting green light G at a viewing angle AV and output through the second lens L2, and the third-color light Bo emitted from the optical axis of the third light-emitting device OLED3 emitting blue light B at a viewing angle AV and output through the third lens L3, respectively, pass through the second color filter layer CF2 and the third color filter layer CF3, the transmitted second-color light Gt and third-color light Bt can have a brightness that is reduced compared to the brightness of the output second-color light Gt and third-color light Bot. In other words, the brightness of green light G and blue light B can be reduced by the second color filter layer CF2 and the third color filter layer CF3.

[0117] However, as Figure 4As shown, even when the first colored light Ro emitted from the optical axis of the first light-emitting device OLED1 emitting red light R at a specific viewing angle AV and output through the first lens L1 passes through the first color filter layer CF1, the transmitted first colored light Rt can maintain the brightness of the output first colored light Ro. That is, based on the first color filter layer CF1, the brightness of the red light R can be maintained without decreasing.

[0118] The pigments included in the first color filter layer CF1 to the third color filter layer CF3 can be the same first pigment P1. The rate of reduction in brightness of the second color light G and the third color light B caused by the first pigment P1 can be greater than the rate of reduction in brightness of the first color light R caused by the first pigment P1. For example, the brightness of the first color light R can be maintained by the first pigment P1, and the brightness of the second color light G and the third color light B can be reduced by the first pigment P1.

[0119] The transmittance of the first pigment P1 to green light G and blue light B can be lower than that to red light R. Based on the transmittance difference of each color of the first pigment P1, for example, the first color filter layer CF1 can maintain the brightness of the first color light R, and the second color filter layer CF2 and the third color filter layer CF3 can reduce the brightness of the second color light G and the third color light B.

[0120] Here, for example, the first pigment P1 may include at least one of chlorinated copper phthalocyanine (PG7), PG36 and nickel complex pigments as pigments for green filters, and copper phthalocyanine (PB15:3), indanthrone blue (PB60) and ultramarine blue as pigments for blue filters.

[0121] In addition, the first color filter layer CF1 to the third color filter layer CF3 may also include an adhesive polymer for the color filter and a dispersion stabilizer that helps to form a film and uniformly disperse pigment particles.

[0122] The adhesive polymer used for color filters may include at least one of epoxy resins (e.g., alicyclic epoxy resins and phenolic epoxy resins), acrylic resins (e.g., polymethyl methacrylate and cross-linked acrylic polymers), polyimides (e.g., fluorinated polyimides), and polyurethanes (e.g., thermosetting polyurethanes).

[0123] The dispersion stabilizer that helps to form films and uniformly disperse pigment particles can be a superdispersant, polyvinylpyrrolidone, silicone-based surfactant or other additive, and may include at least one of ultraviolet (UV) stabilizers and crosslinking agents.

[0124] In addition to the first pigment P1, the binder polymer, and the dispersion stabilizer, each of the first color filter layers CF1 to the third color filter layers CF3 may further include lens material by mixing.

[0125] Therefore, in this disclosure, the refractive index of each of the first color filter layer CF1 to the third color filter layer CF3 can be the same as the refractive index of each of the first lens L1 to the third lens L3. As described above, the refractive index of the color filter layer can be the same as the refractive index of the lens, and thus, the reflection or refraction of colored light from the interface between the color filter layer and the lens can be minimized.

[0126] Color filter layers do not need to use different pigments and can use a common first pigment, thus reducing the cost and manufacturing process of color filter layers.

[0127] The example described above, from the first color filter layer CF1 to the third color filter layer CF3, includes the same first pigment P1; however, embodiments of this disclosure are not limited thereto. For example, the pigments included in the first color filter layer CF1 to the third color filter layer CF3 may be different. In the following description, for convenience, the case where the pigments included in the first color filter layer CF1 to the third color filter layer CF3 are the same first pigment P1 will be used as an example.

[0128] The thicknesses of the first color filter layer CF1 to the third color filter layer CF3 on the side surfaces of the first lens L1 to the third lens L3 can each be greater than the thickness of the first color filter layer CF1 to the third color filter layer CF3 at the center of the upper surface of the first lens L1 to the third lens L3. This will be referred to below. Figure 5 Describe it.

[0129] The low-refractive-index layer 700 can be disposed on the first to third color filter lenses CLR, CLG, and CLB, and on the second barrier BR2 exposed in the area between adjacent color filter lenses. The refractive index of the low-refractive-index layer 700 can be less than the refractive index of each of the first to third color filter lenses CLR, CLG, and CLB.

[0130] The low-refractive-index layer 700 can eliminate the step height caused by each color filter lens, and its upper surface can include a flat surface. The low-refractive-index layer 700 can include an insulating material with high flexibility. The thickness T700 of the low-refractive-index layer 700 can be greater than the maximum height b of each of the first to third color filter lenses CLR, CLG, and CLB.

[0131] A quarter-wave plate (QWP) can be disposed on the low-refractive layer 700 and can delay the wavelength phase of the colored light passing through the first color filter lens to the third color filter lenses CLR, CLG, and CLB by λ / 4. The QWP can convert linear polarization to circular polarization and vice versa. The QWP can be disposed together with a polarizer (not shown) and can be used to reduce the reflection of external light or to increase or decrease the viewing angle of the colored light in each sub-pixel.

[0132] A cover layer (not shown), such as glass, can also be provided on the quarter-wave plate (QWP) to protect it from external influences.

[0133] In embodiments of this disclosure, the first color filter layer to the third color filter layer may be disposed on the surface of the first lens to the third lens, the first lens to the third lens being disposed on the first sub-pixel to the third sub-pixel emitting the first color light to the third color light, and the light transmittance of the first color filter layer to the third color filter layer may be different for each color light, thereby enhancing the visibility of the display panel.

[0134] Figure 5 It is used to describe Figure 3 A magnified view showing the thickness variation of the color filter layer in each color filter lens, and... Figure 6A and Figure 6B It is used to describe when the color filter layer has, for example, Figure 5 The graph shows the reduction in brightness of the second and third colors of light relative to the viewing angle when the thickness is within the range.

[0135] Figure 5 The color filter layer CF and the thickness t of the color filter layer CF shown can be applied to each of the first to third color filter lenses CLR, CLG and CLB.

[0136] exist Figure 5 In this context, Io can represent the brightness of the colored light emitted from the light-emitting device and output through the lens L, and It can represent the brightness of the colored light passing through the color filter layer CF.

[0137] The thickness t of the color filter layer CF at the side surface of the lens L can be greater than the thickness t of the color filter layer CF at the center of the upper surface of the lens L. For example, as Figure 5 As shown, the thickness t of the color filter layer CF can gradually increase from the center of the upper surface of the lens L toward the side surface of the lens L. For example, the thickness t of the color filter layer CF can be increased as represented by Equation 1 below.

[0138] [Equation 1]

[0139]

[0140] Here, a can represent the maximum width of lens L, b can represent the maximum height of lens L, θ can represent the output angle or viewing angle of the colored light that is tilted relative to the optical axis (which is the front side of the light-emitting device), and t can represent the thickness of the color filter layer CF.

[0141] Therefore, the brightness reduction rate of each of the second color light G and the third color light B caused by the second color filter layer CF2 and the third color filter layer CF3 can be greater at the second viewing angle than at the first viewing angle, which corresponds to the front of each of the second light-emitting device OLED2 and the third light-emitting device OLED3. The second viewing angle is different from the first viewing angle.

[0142] In detail, in the second color filter lens CLG and the third color filter lens CLB, when the viewing angle is the front of the light-emitting device, the second color filter layer CF2 and the third color filter layer CF3 may hardly reduce the transmittance and brightness of each of the second color light G and the third color light B. However, when the viewing angle increases, the reduction in transmittance and brightness of each of the second color light G and the third color light B may be relatively greater than if the color filter layer were omitted.

[0143] Furthermore, in the first color filter lens CLR, the degree to which the transmittance and brightness of the first color light R are reduced by the first color filter layer CF1 can be substantially the same as in the case where the color filter layer is omitted, and is independent of the increase or decrease of the viewing angle.

[0144] According to this disclosure, when the thickness of each of the first color filter layer CF1 to the third color filter layer CF3 changes, such as Figure 6A and 6B As shown, the degree to which the brightness of the second color light G and the third color light B decreases relative to the viewing angle can be changed.

[0145] Figure 6A This is a graph used to describe the degree of reduction in the brightness of the second color light of the embodiment PG relative to the viewing angle of the second color filter lens compared to Comparative Example RG. Figure 6B It is a graph used to describe the degree of reduction in the brightness of the third color light of embodiment PB relative to the viewing angle of the third color filter lens compared with comparative example RB.

[0146] Figure 6A Comparative example RG can correspond to the following cases: the second color filter layer is omitted in the second color filter lens, and the entire second color filter lens is only equipped with a transparent lens, and Figure 6B Comparative example RB can correspond to the following cases: the third color filter layer is omitted in the third color filter lens, and the entire third color filter lens is only equipped with a transparent lens.

[0147] exist Figure 6A and Figure 6B In this diagram, the x-axis represents the viewing angle, and the y-axis represents the brightness of the colored light relative to the viewing angle.

[0148] exist Figure 6A and Figure 6B In all embodiments PG and PB, as well as comparative examples RG and RB, it can be seen that, relative to the frontal viewing angle (e.g., 0 degrees (0°)), the brightness GL of the second color light G and the brightness BL of the third color light B decrease as the viewing angle increases.

[0149] However, it can be confirmed that as the viewing angle increases, the brightness GL of the second color light G according to embodiment PG and the brightness BL of the third color light B according to embodiment PB decrease more than those of comparative examples RG and RB.

[0150] Specifically, such as Figure 6A and Figure 6B As shown, in all embodiments PG and PB, and comparative examples RG and RB, when the viewing angle is 0 degrees, the brightness GL of the second color light G and the brightness BL of the third color light B may not decrease and may both be equal to 100%. However, when the viewing angle AV has a large angle of 20 degrees or more, it can be confirmed that the brightness GL of the second color light G according to embodiment PG and the brightness BL of the third color light B according to embodiment PB are relatively more reduced than those in comparative examples RG and RB.

[0151] although Figure 6A and Figure 6B Although not shown, the first color filter lens CLR according to the embodiment can be substantially the same as the comparative example in terms of the degree to which the first color R is reduced relative to the viewing angle AV.

[0152] In the following text, in the comparative examples, reference will be made to... Figure 7 Describe the brightness changes of the first color light to the third color light relative to the viewing angle.

[0153] Figure 7 It is a graph used to describe the brightness changes of the first color light to the third color light R, G, and B relative to the viewing angle when the lens set on the sub-pixel is only configured with a transparent lens and no color filter layer.

[0154] In the following text, for ease of description, the state in which no lens L is set on the sub-pixel can be represented as a reference value, and the state in which the entire color filter lens only includes lens L and has no color filter layer can be represented as a comparative example.

[0155] exist Figure 7 In this diagram, the x-axis represents the viewing angle, and the y-axis represents the ratio of the brightness of the comparative example's colored light to that of the reference value relative to the viewing angle, where Ref-L represents the percentage (%). In other words, the y-axis represents the degree of brightness of the comparative example's colored light relative to the reference value when the brightness of each reference value's colored light relative to the viewing angle is set to 100.

[0156] like Figure 7 As shown, when the viewing angle is approximately 10 degrees or less and close to the front of the sub-pixel, the brightness of the color light relative to the reference value is approximately 100% in all the first to third color lights R, G, and B. That is, in the brightness of the color light on the front, it can be seen that the reference value is almost equal to the comparison example.

[0157] However, when the viewing angle increases from AV1 to AV2, it can be confirmed that in the first color light R, the brightness ratio Ref-L of the color light to the reference value decreases to about 95%, but in the second color light G, the brightness ratio Ref-L of the color light to the reference value increases to about 105%, and in the third color light B, the brightness ratio Ref-L of the color light to the reference value increases to about 115%.

[0158] Furthermore, when the viewing angle increases to AV2 or greater, it can be confirmed that the brightness ratio Ref-L of the color light to the reference value decreases in all first to third color lights R, G and B.

[0159] In other words, in the comparative example, it can be confirmed that as the viewing angle increases from AV1 to AV2, the difference between the brightness ratio Ref-L of the first color light R and the reference value and the brightness ratio Ref-L of each of the second color light G and the third color light B and the reference value generally increases, and when the viewing angle increases to AV2 or greater, the difference between the brightness ratio Ref-L of the first color light R and the second color light G and the third color light B generally remains unchanged.

[0160] As described above, in the comparative example where lens L is set only on a sub-pixel, it can be confirmed that as the viewing angle increases, the difference in brightness relative to the colored light increases, and therefore, the brightness ratio relative to the colored light changes, resulting in decreased visibility. In this case, there may be a problem where the color coordinates should be reset based on the reference value.

[0161] However, as referenced above in this disclosure Figure 5The statement states that when the thickness t of the color filter layer CF is formed such that it is greater at the side surface of the lens L than at the center of the upper surface of the lens L, in Figure 7 In this way, the difference between the brightness ratio Ref-L relative to the viewing angle and the reference value can be reduced, and therefore, the color perception can be enhanced even without resetting the color coordinates based on the reference value.

[0162] As described above, this disclosure allows for a reduction in the brightness of the second color light G and the third color light B along the arrow direction relative to an increase in viewing angle, while maintaining a constant brightness of the first color light R. Therefore, the difference between the brightness change of the first color light and the brightness change of each of the second and third color lights can be reduced, and thus, the visibility of the display panel can be further enhanced.

[0163] In embodiments of this disclosure, a first color filter layer and a second color filter layer may be disposed on the surfaces of a first lens and a second lens, the first lens and the second lens are disposed on a first sub-pixel and a second sub-pixel that respectively emit a first color light and a second color light, and the light transmittance of the first color filter layer and the second color filter layer may be different relative to the color light, thereby enhancing the visibility of the display panel.

[0164] Furthermore, in embodiments of this disclosure, the thickness of the color filter layer at the side surface of the lens can be greater than the thickness of the color filter layer at the center of the upper surface of the lens, and thus, the difference between the brightness change of the first color light caused by the increase in viewing angle and the brightness changes of the second and third color lights can be reduced, thereby further enhancing the visibility of the display panel.

[0165] The effects of this disclosure are not limited to the examples above, and various other effects may be included in this specification.

[0166] While this disclosure has been specifically shown and described with reference to exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure as defined by the appended claims.

Claims

1. A display panel, comprising: The first sub-pixel includes a first light-emitting device that emits light of a first color. The second sub-pixel includes a second light-emitting device that emits light of the second color. The first color filter lens includes a first lens disposed on the first sub-pixel and a first color filter layer disposed on the surface of the first lens. as well as The second color filter lens includes a second lens disposed on top of the second sub-pixel and a second color filter layer disposed on the surface of the second lens. The first color filter layer includes a pigment that transmits the first color light. The second color filter layer includes a pigment that transmits the second color light, and The transmittance of the second color light in the second color filter layer is lower than the transmittance of the first color light in the first color filter layer.

2. The display panel of claim 1, wherein, The first color filter layer and the second color filter layer comprise a common first pigment.

3. The display panel of claim 2, wherein, The rate of decrease in brightness of the second color light caused by the first pigment is greater than the rate of decrease in brightness of the first color light caused by the first pigment.

4. The display panel of claim 2, wherein, Each of the first lens and the second lens includes a lens material, said lens material comprising at least one of a polymer-based material and an inorganic material, and Each of the first color filter layer and the second color filter layer includes a combination of the first pigment and the lens material.

5. The display panel according to claim 2, wherein, The first pigment includes at least one of green filter pigment and blue filter pigment, and The green filter pigment is selected from at least one of copper phthalocyanine chloride (PG7), PG36 and nickel complex pigment, and the blue filter pigment is selected from at least one of copper phthalocyanine (PB15:3), indigo blue (PB60) and ultramarine blue.

6. The display panel according to claim 1, wherein, The outer surface of each of the first and second color filter layers includes a curved surface corresponding to the upper curved surface of the corresponding lens in the first and second lenses.

7. The display panel according to claim 1, wherein, The refractive index of the first color filter layer is the same as the refractive index of the first lens, and The refractive index of the second color filter layer is the same as that of the second lens.

8. The display panel according to claim 1, wherein, The maximum height of each of the first lens and the second lens is greater than the maximum width of each of the first lens and the second lens.

9. The display panel according to claim 1, wherein, The thickness of each of the first and second color filter layers at the side surface of the corresponding lens in the first and second lenses is greater than the thickness of each of the first and second color filter layers at the center of the upper surface of the corresponding lens in the first and second lenses.

10. The display panel according to claim 1, wherein, The rate of brightness reduction of the second color light caused by the second color filter layer is greater at a second viewing angle than at a first viewing angle corresponding to the front of the second light-emitting device, and the second viewing angle is different from the first viewing angle.

11. The display panel according to claim 1, wherein, The first color light is red light, and the second color light is green light or blue light.

12. The display panel according to claim 1, wherein, The first color filter lens disposed on the first sub-pixel is provided as one, and The second color filter lens disposed on the second sub-pixel is provided as one.

13. The display panel according to claim 1, further comprising: An encapsulation layer disposed on the first light-emitting device and the second light-emitting device; An optical layer disposed between the encapsulation layer and the first color filter lens and the second color filter lens; as well as A low-refractive layer is disposed on the first color filter lens and the second color filter lens. The refractive index of each of the first color filter lens and the second color filter lens is greater than the refractive index of the low-refractive layer.

14. The display panel according to claim 13, wherein, The thickness of the optical layer is less than the maximum height of each of the first and second color filter lenses.

15. The display panel according to claim 13, wherein, The thickness of the low-refractive layer is greater than the maximum height of each of the first and second color filter lenses.

16. The display panel according to claim 13, further comprising: A dam defining the light-emitting area of ​​the first sub-pixel and the light-emitting area of ​​the second sub-pixel. The embankment overlaps with the space between the first color filter lens and the second color filter lens.

17. The display panel according to claim 16, further comprising: A first barrier at the portion where it overlaps with the embankment between the encapsulation layer and the optical layer. The first barrier is a black matrix comprising light-absorbing material.

18. The display panel according to claim 16, further comprising: A second barrier at the portion where it overlaps with the embankment between the optical layer and the low-refractive layer. The second barrier is a touch electrode made of metallic material.

19. The display panel according to claim 1, further comprising: The third sub-pixel includes a third light-emitting device that emits a third color of light; The third color filter lens includes a third lens disposed superimposed on the third sub-pixel, and a third color filter layer disposed on the surface of the third lens. The third color filter layer includes a pigment that transmits the third color light, and The transmittance of the third color light in the third color filter layer is lower than the transmittance of the first color light in the first color filter layer.

20. The display panel according to claim 19, wherein, The brightness reduction rate of the third color light caused by the third color filter layer is greater at a second viewing angle than at a first viewing angle corresponding to the front of the third light-emitting device, and the second viewing angle is different from the first viewing angle.

Images