DISPLAY DEVICE

A display device is disclosed. The display device includes a display module, a peripheral member, and a cover glass. The peripheral member is disposed on the display module and partially overlaps the display module. The cover glass is disposed on the peripheral member. The peripheral member includes a color filter layer.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority of China Patent Application No. 202010064785.4, filed on Jan. 20, 2020, the entirety of which is incorporated by reference herein.

BACKGROUND OF THE DISCLOSURE

Field of the Disclosure

The present disclosure relates to a display device, and particularly it relates to a display device that may reduce the color difference between a display region and a non-display region when the display device is turned off.

Description of the Related Art

In recent years, in response to continuous improvement in display devices and the quality of displayed images, consumers' requirements for the design texture of display devices have also continuously increased. Generally, a display device includes a display region for displaying images and a non-display region enclosed by the display area. When the display device is turned off, it is desirable that the color (for example, black) presented in the display region is consistent with the color (for example, black) of the non-display region, so that the display device has visual unity, thereby enhancing the texture or quality of the product. However, in conventional display devices, because the non-display region is limited by the materials used to fabricate it, it is difficult to match the color of the non-display region to the color of the display region while in a non-display state.

BRIEF SUMMARY OF THE DISCLOSURE

One embodiment of the present disclosure discloses a display device. The display device includes a display module, a peripheral member, and a cover glass. The peripheral member is disposed on the display module and partially overlaps the display module. The cover glass is disposed on the peripheral member. The peripheral member includes a color filter layer.

According to the display device of each of the above embodiments, the peripheral member surrounding the display module includes a color filter layer. By adjusting the aperture ratio of the pixels in the color filter layer and the area percentage of adjustment unit of each color, the color difference between the non-display region and the display region may be reduced when the display device is turned off.

DETAILED DESCRIPTION OF THE DISCLOSURE

The following description provides many different embodiments for implementing different features of the present disclosure. The elements and arrangements described in the following specific embodiments are only used to concisely express the disclosure, however, the disclosure is not limited thereto. For example, the description related to the structure where a first feature is on or above a second feature indicates that there is a direct contact between the first and second features or that another feature is placed between the first and second features such that the first feature does not directly contact with the second feature.

The words which are used to describe a spatial relationship, such as above or below, are only used to describe the relationship of one element or feature with respect to another element or feature in the drawings. In addition to the orientation described in the drawings, devices may be used or operate in different orientations. The shapes, sizes, and thicknesses shown in the drawings may not be drawn to scale or may be simplified for the purpose of clear description, and they are only provided for illustrative purposes.

FIG. 1is a front view of a display device10according to an embodiment of the disclosure. When viewed from the front, a display device10includes a display region101and a non-display region102surrounding the display region101. When the display device10is turned off to cause the display region101to appear, for example, black, reducing the color difference between the non-display region102and the display region101can raise the visual unity of the display device10.

Accordingly, the colors seen by the human eye must first be quantified. A color may be defined using the CIE 1976 (L*, a*, b*) color space. Each color of the CIE 1976 color space is determined by three coordinates, wherein L* represents the brightness of the color. L*=0 represents black, and L*=100 represents white. The hue represented by a* and b* is close to red when a* is a positive value, close to green when a* is a negative value, close to yellow when b* is a positive value, and close to blue when b* is a negative value. Assume that, when the display device10is turned off, a CIE 1976 color space coordinate of the display region101is represented by be R101(L1*, a1*, b1*), and a CIE 1976 color space coordinate of the non-display region102is represented by R102(L2*, a2*, b2*). Then, Equation 1, which is an equation that calculates the color difference value ΔE of the display region101and the non-display region102. The smaller the color difference value ΔE is, the closer the colors of the display region101and the non-display area102are. When the color difference value ΔE is less than 3, the color difference between the display region101and the non-display region102cannot be recognized through the human eye.

In the past, the color of the non-display region was adjusted by mixing a plurality of inks. However, because of the limitations of ink materials, the colors that can be adjusted are also limited, and it is not easy to match the specific color of the display region. Therefore, in the present disclosure, patterned color resists are disposed in the non-display region102. By adjusting the aperture ratio of the color resists and the area percentage of each color resist, the adjustable range of the non-display region102can be greatly increased, thereby improving the visual unity of the display region101and the non-display region102.

FIG. 2is a cross-sectional view showing the structure of the display device10ofFIG. 1. Referring toFIGS. 1 and 2, the display device10may include a display module112, a peripheral member113disposed on the display module112, and a cover glass111disposed on the peripheral member113. The range where the peripheral member113and the cover glass111overlap corresponds to the non-display region102, and the range where the peripheral member113and the cover glass111do not overlap corresponds to the display region101.

The display module112may, for example, includes light emitting diodes (LEDs), liquid crystals, quantum dots (QDs), fluorescence, phosphor, other suitable materials, or the combination of the above materials, but the present disclosure is not limited thereto. In some embodiments, the light emitting diodes may include, for example, organic light emitting diodes (OLEDs), submillimeter light emitting diodes (mini LEDs), micro light emitting diodes (micro LEDs), or quantum dot light emitting diodes (QLEDs, QDLEDs), but the present disclosure is not limited thereto. As shown inFIG. 2, the display module112is disposed under the peripheral member113. The display module112may include, for example, an adhesive material1121, an upper polarizer1122, a liquid crystal panel1123, and a lower polarizer1124, but the present disclosure is not limited thereto. The display module112can be bonded to the cover glass111and/or the peripheral member113through the adhesive material1121. In some embodiments, in the normal direction of the cover glass111, each of the adhesive material1121, the upper polarizer1122, the liquid crystal panel1123, and the lower polarizer1124of the display module112are disposed under the peripheral member113, and the peripheral member113and the display module112may partially overlap. When the display device10is turned on, the light from a backlight source (not shown) will sequentially pass through the lower polarizer plate1124, the liquid crystal panel1123, the upper polarizer1122, the adhesive material1121, and the cover glass111from below to emit out to display images. When the display device10is turned off, the backlight does not emit light, and the displayed color of the display region101seen by the user mainly come from the light that enters the human eye after the external light is reflected in the display area101.

The peripheral member113may include a color filter layer1131and a light shielding layer1132. The color filter layer1131is disposed on the display module112. The light shielding layer1132may be disposed between the color filter layer1131and the display module112. When the display device10is turned on, the light-shielding layer1132may be used to reduce the incidence of external light or the transmission of the backlight which can affect the display quality of the display module112or the light-shielding layer1132may be used to shield a component of the display device, the component of the display device such as a printed circuit board (PCB) or a backlight source, but the present disclosure is not limited thereto. When the display device10is turned off, since the peripheral member113is not a self-luminous region, the presented color of the peripheral member113comes from the light that enters the human eye after the external light is reflected in the non-display region102.

The color filter layer1131may include an adjustment unit301, an adjustment unit302, and an adjustment unit303, but the present disclosure is not limited thereto. The color filter layer1131may further include an adjustment unit310.FIG. 3is a schematic diagram showing an example of the pattern of each adjustment unit in the color filter layer1131in the non-display region102of the display device10ofFIG. 2. Referring toFIG. 3, the adjustment unit310surrounds the adjustment unit301, the adjustment unit302, and the adjustment unit303, but the disclosure is not limited thereto. The above adjustment units may correspond to different colors. For example, the adjustment unit301may correspond to red, the adjustment unit302may correspond to blue, the adjustment unit303may correspond to green, and the adjustment unit310may correspond to black, however the present disclosure is not limited thereto. In another embodiment, each adjustment unit may correspond to a combination of various colors.

In some embodiments, the aforementioned adjustment units310,301,302, and303may include color resists of different colors, and the color resist of each color has its own reflection spectrum.FIG. 4shows the reflection spectrum of each of the adjustment units301,302,303, and310in the color filter layer1131shown inFIG. 3. InFIG. 4, the horizontal axis represents the wavelength (nm) of the reflected light, and the vertical axis represents the reflectivity (percentage). As shown inFIG. 1,FIG. 3andFIG. 4, the color resists of different colors, such as red, blue, green, and black color resists, have light distributions in different wavelengths. Therefore, by adjusting the area percentage of each of the adjustment units301,302,303, and310in the color filter layer1131, the color of the non-display region102can be adjusted. In an embodiment of the present disclosure, the adjustment unit301may include a red color resist, the adjustment unit302may include a blue color resist, and the adjustment unit303may include a green color resist. Referring toFIGS. 2 and 3, the ratio of the total area of the adjustment unit301, the adjustment unit302, and the adjustment unit303and the area of the adjustment unit310is defined as the aperture ratio, but the present disclosure is not limited thereto. In a case where the aperture ratio is set to 50%, the ranges of the color variation, which can be adjusted by the area percentages of the adjustment unit301, the adjustment unit302, and the adjustment unit303, are shown inFIG. 5.

FIG. 5shows distributions in the CIE 1976 color space, which correspond to the percentages of the red, blue, and green color resists included in the adjustment unit301, the adjustment unit302, and the adjustment unit303in the color filter layer1131when the aperture ratio is 50%. When the area percentage of one color resist is adjusted, the remaining area is divided equally between the other two color resists. For example, if the area of the red color resist area is adjusted, the area of each of the green and blue color resists is equal to the average of the sum of the areas of the adjustment units301,302, and303before the adjustment minus the adjusted are of the red color resist, but the present disclosure is not limited thereto. The straight line LRrepresents the range of the color variation of the non-display region102in the CIE 1976 color space when the area percentage of the red color resist is adjusted. When the area percentage of the red color resist is larger, the values a* and b* are larger; when the area percentage of the red color resist is less, the values a* and b* are less. The straight line LGrepresents the range of the color variation of the non-display region102in the CIE 1976 color space when the area percentage of the green color resist is adjusted. When the area percentage of the green color resist is larger, the value a* is smaller while the value b* is larger; when the area percentage of the green color resist is less, the value a* is larger while b* is less. The straight line LBrepresents the range of the color variation of the non-display region102in the CIE 1976 color space when the area percentage of the blue color resist is adjusted. When the area percentage of the blue color resist is larger, the value a* is larger while the value b* is smaller; when the area percentage of the blue color resist is less, the value a* is less while b* is larger. When the area percentages of the red color resist, the green color resist, and the blue color resist are all ⅓, the color coordinate is the point where the three straight lines LR, LG, and LBintersect. According toFIG. 1andFIG. 5, in a case where the aperture ratio is fixed at 50%, by only adjusting the area percentage of each color resist, the color of the non-display region102can be adjusted such that the value a* is in a range of −5 to 4 (a*=−5˜4) and the value b* is in a range of −4 to 4 (b*=−4˜4).

Moreover, the aperture ratio is also set as a variable factor, the adjustable range of the color of the non-display region102will be wider, so that the color of the non-display region102is easily close to the color of the display region101in the non-display state In other words, the area percentage of each adjustment unit in the color filter layer1131can be adjusted so that the adjustment unit301, the adjustment unit302, and the adjustment unit303have different area percentages, thereby adjusting the color of the non-display region102. Accordingly, the color difference ΔE between the peripheral member113and the display module112in the non-display state is less than 3, that is, the human eye cannot distinguish the color difference between the non-display region102and the display region101in the non-display state. In another embodiment of the present disclosure, for example, the area percentages of the four adjustment units301,302,303, and310can be adjusted so that the four adjustment units301,302,303, and310have different area percentages, thereby adjusting the color of the non-display region102, but the disclosure is not limited thereto. In another embodiment of the present disclosure, for example, the four adjustment units301,302,303, and310may have different shapes, such as rectangular or circular, etc., thereby adjusting the color of the non-display region, but the present disclosure is not limited thereto.

It should be noted that although the color filter layer1131is manufactured by using the same manufacturing method as color filters of the liquid crystal panel1123, the color filter layer1131is arranged around the display module112but does not belong to the liquid crystal panel1123. Therefore, the color filter layer1131is not manufactured at the same time as the color filters of the liquid crystal panel1123. In addition, the color filter layer1131is used for adjustment of a specific color, for example, black, and, thus, the function of the color filter layer1131is different from the color-displaying function of the color filters in the liquid crystal panel1123.

According to the above embodiments, the present disclosure disposes the peripheral member comprising the color filter layer in the non-display region of the display device and adjusts the aperture ratio of the color filter layer and the area percentage of each color filter unit. Thus, when the display device is turned off, the color difference between the non-display region in the peripheral member and the display region outside the peripheral member is reduced.

FIG. 6(a)-6(c)are schematic diagrams showing other examples of the pattern of the color filter layer in the display device ofFIG. 1. As shown inFIG. 3, the color filter layer may include the adjustment units301,302,303, and310, and the adjustment units301,302, and303may have the same area and are arranged periodically, however, the present disclosure is not limited thereto. As shown inFIG. 6(a), the adjustment units301′,302′, and303′ of the color filter layer correspond to different colors, for example, red, green, and blue, respectively and have different area percentages, and the adjustment units301′,302′, and303′ are arranged periodically. In another embodiment, as shown inFIG. 6(b), the adjustment units301′,302′,303′, and304′ of the color filter layer correspond to different colors, for example, red, green, blue, and yellow, respectively and have different area percentages, and the adjustment units301′,302′,303′, and304′ are arranged periodically. In another embodiment, as shown inFIG. 6(c), the adjustment units301′,302′,303′, and304′ of the color filter layer correspond to different colors and may have different area percentages, and the adjustment unit301′,302′,303′,304′ are arranged non-periodically. In further another embodiment, at least two of the different color resists in the adjustment unit301′,302′,303′, and304′ may overlap each other or overlap each other in a certain direction (not shown), but the present disclosure is not limited thereto. In the embodiment, an area percentage of an adjustment unit is a percentage of the area of one of the adjustment units to the total area of all the adjustment units in the direction of the top view. For example, as shown inFIG. 6(a), in the cases where the adjustment units301′˜304′ are observed for example through an optical microscope, the area percentage of the adjustment unit301′ is a percentage obtained through dividing the area of the adjustment unit301′ by the sum of the areas of all the adjustment units301′˜304′.

In another embodiment of the present disclosure, for example, the four adjustment units301′,302′,303′, and304′ may have different shapes, thereby adjusting the color of the non-display region102, but the present disclosure is not limited thereto.FIG. 6(a)shows an example of the definition of the shapes and the area percentages. Referring toFIG. 6(a), the adjustment unit301′ and the adjustment unit302′ have the same shape (for example, rectangle) but different area percentages. In some embodiments, the adjustment unit301′ may be circular, while the adjustment unit302′ may be rectangular, but the disclosure is not limited thereto.

FIG. 7shows a tolerance range of pixels per inch (PPI) of a display device where the human eye cannot perceive pixels under different viewing distances. The horizontal axis represents the viewing distance (cm), and the vertical axis represents the value representing pixels per inch (PPI). In order to prevent the human eye from perceiving the graininess of the pixels, the density of the pixels in the display device must be limited. Specifically, as shown by a curve A inFIG. 7, the curve A represents the lower limit that the human eye cannot perceive pixels at various viewing distances. Therefore, if the value representing pixels per inch (PPI) of the display device is above the curve A, the requirement for pixels being invisible to the human eye can be met.

According toFIG. 7, the value representing pixels per inch of each adjustment unit of the color filter layer in the non-display region may be determined according to the actual viewing distance of the display device. The dotted line B shown in FIG. is the upper limit of the density of the color filter layer in the manufacturing process. In the embodiment, the upper limit is 400 pixels per inch for example. Taking a vehicle display device as an example, the viewing distance in which the user watches the display device is about 50˜80 cm, and the value representing pixels per inch of each adjustment unit of the color filter layer can be set in the gray region above the curve A and below the dotted line B. Corresponding toFIG. 7, the upper and lower limits of the value representing pixels per inch for the viewing distances of 50˜80 cm are shown in Table 1.

If the condition that the human eye cannot perceive pixels is met in any vi win distance within the range of 50˜80 cm, the lower limit of pixels per inch (PPI) must be 165.9 pixels per inch (PPI) corresponding to the viewing distance of 50 cm, which is the strictest and safest PPI value for the vie distances within the range 50˜80 cm. In this way, by designing the pixel pitch of the color filter layer in the non-display region of the display device to cause the PPI value to be above 103.7 pixels per inch and below 400 pixels per inch (for example, 110 pixels per inch, 120 pixels per inch, or 300 pixels per inch), the user's perception of the presence of pixel particles in the non-display region can be degraded.

It should be noted that the above-mentioned pixel-pitch setting is based on the example that the display device is a vehicle display device. The display device disclosed in the present disclosure is not limited to a vehicle display device. However, the display device disclosed in the present disclosure may be applied to other devices, such as electronic bulletin boards, televisions, and the like. When the display device disclosed in the present disclosure is applied to devices with a longer viewing distance, such as outdoor electronic signage or spliced displays, the lower limit of the value representing pixels per inch can be adjusted based on the viewing distances shown inFIG. 7.

According to the above-mentioned embodiments, the present disclosure causes the color of the non-display region to be close to the color of the display region by disposing the color filter layer in the peripheral member in the non-display region of the display device. The present disclosure further sets the value representing pixels per inch of the adjustment unit of the color filter layer in the non-display region to prevent the user from perceiving the pixel particles.

Although this disclosure uses various embodiments above, they are only for reference rather than limiting the scope of this disclosure. Those skilled in the art may make few changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the above-mentioned embodiments are not used to limit the scope of the present disclosure, and the protection scope of the present disclosure should be defined by claims. The above-disclosed features can be combined, modified, replaced, or transferred with one or more disclosed embodiments in any suitable manner, and the present disclosure is not limited any specific embodiment.