CN100399567C - flat display panel - Google Patents

Abstract

A flat display panel comprises a first substrate, a second substrate, a black matrix pattern arranged in a non-display area on the surface of the second substrate, and a brightness enhancement film arranged on the surface of the second substrate opposite to the first substrate, wherein the area of the black matrix pattern accounts for 70-95% of the area of the corresponding pixel area.

Description

flat display panel

technical field

The present invention relates to a plane display panel, in particular to a plane display panel provided with a black matrix pattern and an enhancement sheet, and the area of the black matrix pattern accounts for 70% to 95% of the area of the pixel area.

Background technique

Organic Light Emitting Display (Organic Light Emitting Display), a kind of Electroluminescence (EL) display, is expected to be Instead of liquid crystal displays and plasma displays, it has become the mainstream of the new generation of flat panel displays.

However, because the wire patterns or electrodes made of metal materials inside the organic light-emitting display will reflect the ambient light source, it has the problem of poor contrast. Therefore, the organic light-emitting display must be equipped with a device to eliminate the ambient light source to improve the disadvantage of poor contrast. In the prior art, there are mainly the following two methods for improving the contrast ratio of organic light emitting displays. The first existing method is to arrange a polarizer, such as a circular polarizer, on the surface of the substrate of the organic light emitting display to reduce the reflection of the ambient light source. However, although the polarizer can effectively reduce the reflection of the ambient light source, it also makes the light generated by the organic light-emitting display itself only have a transmittance of about 43%, thus resulting in poor luminous efficiency. In order to achieve sufficient display brightness, it is necessary to It will increase the power consumption of the organic light emitting display. The second existing method is to set a black matrix pattern on the non-display area of the organic light-emitting display panel, so as to reduce the reflection of the ambient light source. However, setting the black matrix pattern in the non-display area can only reduce partial reflection, such as the reflection of ambient light caused by metal wires and electrodes of thin film transistors, but it cannot reduce the reflection caused by the metal electrodes in the display area. The contrast ratio of emissive displays is still not good.

Contents of the invention

The purpose of the present invention is to provide a flat display panel to effectively improve the contrast of the flat display panel.

The flat display panel provided by the present invention includes:

a first substrate;

A second substrate, the second substrate area is divided into a plurality of pixel areas, and each pixel area includes a display area and a non-display area;

A black matrix pattern is arranged on a surface of the second substrate, and the black matrix pattern is arranged in each of the non-display areas; and

a brightness enhancement sheet, disposed on a surface of the second substrate facing away from the first substrate;

Wherein the area of the black matrix pattern in each pixel area accounts for 70% to 95% of the area of each corresponding pixel area.

In order to make the above-mentioned purpose, features, and advantages of the present invention more comprehensible, preferred implementation modes are specifically cited below, and are described in detail in conjunction with the accompanying drawings as follows. However, the following preferred embodiments and drawings are only for reference and description, and are not intended to limit the present invention.

Description of drawings

FIG. 1 is a schematic diagram of an organic light emitting display panel according to a preferred embodiment of the present invention.

FIG. 2 is a schematic diagram of an organic light emitting display panel according to another preferred embodiment of the present invention.

FIG. 3 is a schematic diagram of the configuration of pixel regions of an organic light emitting display panel of the present invention.

FIG. 4 is a schematic diagram of an organic light emitting display panel according to another preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of an organic light emitting display panel according to another preferred embodiment of the present invention.

simple notation

10 organic light emitting display panel 12 first substrate

14 Second Substrate 16 Pixel Area

18 Non-display area 20 Display area

22 Black matrix pattern 24 Interlayer dielectric layer

26 Switching element 28 Pixel electrode

30 organic light-emitting layer 32 cathode

34 brilliance enhancement film 50 organic light-emitting display panel

52 First Substrate 54 Second Substrate

56 pixel area 58 non-display area

60 Display area 62 Black matrix pattern

64 Interlayer dielectric layer 66 Switching element

68 Pixel electrode 70 Organic light-emitting layer

72 Cathode 74 Brightness enhancement sheet

76 Color filter pattern 80 Organic light-emitting display panel

82 First Substrate 84 Second Substrate

86 pixel area 88 non-display area

90 Display area 92 Switching element

94 Pixel electrode 96 Organic light-emitting layer

98 Cathode 100 Black matrix pattern

102 Enhancement film 104 Color filter pattern

Detailed ways

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of an organic light emitting display panel according to a preferred embodiment of the present invention. In order to highlight the features of the present invention, only a single pixel area is shown in the figure. As shown in FIG. 1 , the organic light-emitting display panel 10 of the present invention includes a first substrate (upper substrate) 12 and a second substrate (lower substrate) 14, and the first substrate 12 and the second substrate 14 utilize sealant (not shown). Shown) joint, and thereby maintain a fixed distance. The organic light-emitting display panel 10 of this embodiment is a back-emitting panel, so the second substrate 14 is a display surface, so the material of the second substrate 14 is a light-transmitting material such as glass, plastic or quartz, and the first substrate 12 The material is not limited to the light-transmitting material and can also be an opaque material. The second substrate 14 includes a plurality of pixel regions 16 , and each pixel region 16 can be divided into a non-display region 18 and a display region 20 . The organic light-emitting display panel 10 includes a black matrix pattern 22, which is arranged on the surface of the second substrate 14 facing the first substrate 12, so as to reduce the reflection of the ambient light incident from the second substrate 14 against the direction of the first substrate 12, wherein The material of the black matrix pattern 22 can be chromium, chromium oxide and chromium nitride, or any other material with good anti-reflection effect. In addition, the surface of the second substrate 14 and the black matrix pattern 22 is covered with an inter-layer dielectric layer (inter-layer dielectric) 24, and a switch element 26 is arranged on the inter-layer dielectric layer 24 in the non-display area 18, for example A thin film transistor. In addition, a pixel electrode (anode) 28, an organic light-emitting layer 30, and a cathode (reflective electrode) 32 are stacked in sequence on the switch element 26 and the interlayer dielectric layer 24, wherein the pixel electrode 28 is a transparent electrode and is connected to the switch. The element 26 is electrically connected, and the organic light-emitting layer 30 is made of organic light-emitting material, and is driven by the pixel electrode 28 and the cathode 32 to emit light.

The cathode 32 of the organic light emitting display panel 10 is made of a material with high reflective properties, such as metal, so as to reflect the light generated by the organic light emitting layer 30 to improve brightness. However, in addition to reflecting the light generated by the organic light emitting layer 30 , the cathode 32 also reflects ambient light incident from the direction of the second substrate 14 , thus affecting the contrast of the organic light emitting display panel 10 . Therefore, the main feature of the present invention is to increase the proportion of the area of the non-display area 18 , in other words, the proportion of the area of the display area 20 is relatively reduced. In this way, the ambient light reflected by the cathode 32 in the display area 20 will be reduced, so that the contrast of the organic light emitting display panel 10 can be effectively improved. In addition, since the reduction of the area of the display area 20 will also cause the brightness of the organic light emitting display panel 10 itself to decrease, the organic light emitting display panel 10 of the present invention is further provided with a brightness enhancing sheet 34 on the surface of the second substrate 14 facing away from the first substrate 12 , to increase the brightness of the organic light-emitting display panel 10, wherein the brightness enhancement film 34 can use BEF (brightness enhancement film) or DBEF (dual brightness enhancement film) as required, and depending on the type of brightness enhancement film 34 used, its surface can include various Patterns with light-guiding effects in shape, such as circular lens patterns, groove-shaped patterns, or pyramid-shaped patterns, etc. In addition, the brightness enhancement sheet 34 can also be a multi-layer interference type transparent film or any current brightness enhancement structure that can be used to increase brightness.

It is worth noting that in this embodiment, the brightness enhancement sheet 34 is attached to the surface of the second substrate 14 , as shown in FIG. 1 . However, the application of the present invention is not limited thereto, and the brightness enhancement sheet 34 can also be formed on the second substrate 14 in other ways. Please refer to FIG. 2. FIG. 2 is a schematic diagram of an organic light-emitting display panel according to another preferred embodiment of the present invention. In order to clearly compare the similarities and differences between this embodiment and the previous embodiment, the same elements in FIG. 2 are labeled with the same reference numerals , and will not be described further. As shown in FIG. 2, the brightness enhancement sheet 34 of the organic light emitting display panel 10 of this embodiment is directly fabricated on the surface of the second substrate 14, for example, by chemical processing such as etching, or mechanical processing such as sandblasting, which is different from The attachment method used in the foregoing embodiments.

Please refer to FIG. 3 , and refer to FIG. 1 and FIG. 2 together. FIG. 3 is a schematic diagram of the configuration of the pixel area of the organic light emitting display panel of the present invention. As shown in FIG. 2 , the pixel area 16 of the organic light emitting display panel 10 includes a non-display area 18 and a display area 20, wherein the area of the non-display area 18 accounts for 70% to 95% of the entire area of the pixel area 16, That is to say, the black matrix pattern 22 occupies 70% to 95% of the area of the pixel area 16 , combined with the arrangement of the enhancement film 34 , it can not only reduce the reflection of ambient light sources, but also take into account the brightness of the organic light emitting display panel 10 itself. In addition, the shapes and configurations of the non-display area 18 and the display area 20 are not limited, and can be changed according to different designs of the organic light-emitting display panel 10 .

Please refer to FIG. 4 , which is a schematic diagram of an organic light emitting display panel according to another preferred embodiment of the present invention. As shown in FIG. 4, the organic light-emitting display panel 50 of the present invention includes a first substrate (upper substrate) 52 and a second substrate (lower substrate) 54, wherein the second substrate 54 includes a plurality of pixel regions 56, and each pixel The area 56 can be divided into a non-display area 58 and a display area 60 . The organic light emitting display panel 50 includes a black matrix pattern 62 disposed on the surface of the second substrate 54 facing the first substrate 52 to reduce the reflection of ambient light incident from the second substrate 54 facing away from the first substrate 52 . In addition, the surface of the second substrate 54 located in the display area 60 further includes a color filter pattern 76 . In addition, the surfaces of the color filter pattern 74 and the black matrix pattern 62 are covered with an interlayer dielectric layer 64 , and a switch element 66 such as a thin film transistor is disposed on the interlayer dielectric layer 64 in the non-display area 58 . In addition, a pixel electrode (anode) 68 , an organic light emitting layer 70 and a cathode (reflective electrode) 72 are sequentially stacked on the switch element 66 and the interlayer dielectric layer 64 . In addition, the organic light emitting display panel 50 is further provided with a light enhancing sheet 74 on the surface of the second substrate 54 facing away from the first substrate 52 to increase the brightness of the organic light emitting display panel 50 .

Similar to the foregoing embodiments of the present invention, the area of the non-display region 58 of the organic light emitting display panel 50 of this embodiment accounts for 70% to 95% of the entire area of the pixel region 56, that is, the black matrix pattern 62 occupies 70% to 95% of the area of the area 56 , and the difference from the previous embodiment is that the surface of the second substrate 54 of the display area 60 is provided with a color filter pattern 76 . The function of the color filter pattern 76 is to absorb part of the ambient light incident into the display area 60. For example, if the color filter pattern 76 is a blue filter pattern, the ambient light source (white light) within the red wavelength range will be absorbed, so that the ambient light incident into the display area 60 can be reduced, and the ambient light reflected by the cathode 72 in the display area 60 can be reduced, thereby improving the contrast of the organic light emitting display panel 50 .

Please refer to FIG. 5 , which is a schematic diagram of an organic light emitting display panel according to another preferred embodiment of the present invention. As shown in FIG. 5 , the organic light-emitting display panel 80 of the present invention includes a first substrate (lower substrate) 82 and a second substrate (upper substrate) 84, and the first substrate 82 and the second substrate 84 utilize sealant (Fig. not shown) to maintain a constant distance. Since the organic light-emitting display panel 80 of this embodiment is a front-emitting panel, the material of the second substrate 84 is a light-transmitting material such as glass, plastic, or quartz, while the material of the first substrate 82 is not limited to light-transmitting materials but also Can be opaque material. The second substrate 84 includes a plurality of pixel regions 86 , and each pixel region 86 can be divided into a non-display region 88 and a display region 90 . The first substrate 82 located in the non-display area 88 includes a switch element 92, such as a thin film transistor, and the switch element 92 and the first substrate 82 located in the display area 90 are sequentially stacked with a pixel electrode 94, an organic light emitting layer 96 and a cathode 98 . Since the organic light-emitting display panel 80 of this embodiment is a front-emitting panel, the pixel electrode 94 is made of a material with high reflective properties, such as metal, so as to reflect the light generated by the organic light-emitting layer 96 to improve brightness. The cathode 98 is made of transparent conductive material.

In addition, a black matrix pattern 100 is disposed on the second substrate 84 located in the non-display area 88, and the black matrix pattern 100 includes a brightness enhancement film 102. In addition, the second substrate 84 located in the display area 90 can also optionally A color filter pattern 104 is selectively set. The difference between this embodiment and the previous embodiments is that the organic light emitting display panel 80 is a front-emitting panel, so the positions of the black matrix pattern 100, the brightness enhancement film 102 and the color filter pattern 104 are different. However, the organic light emitting display panel 80 It still has the feature that the area of the non-display area 88 accounts for 70% to 95% of the entire area of the pixel area 86. In addition, the functions of the black matrix pattern 100, the brightness enhancement sheet 102 and the color filter pattern 104 have been detailed in the foregoing embodiments. , so no more details will be given here.

In summary, the main feature of the organic light-emitting display panel of the present invention is that the area of the black matrix pattern (non-display area) is controlled between 70% and 95% of the overall area of the pixel area, and with the setting of the brightness enhancement sheet, Therefore, the contrast ratio of the organic light emitting display panel can be improved without affecting the brightness. It is worth noting that the main features of the present invention lie in the area ratio configuration of the non-display area and the display area and the use of the brightness enhancement film. Therefore, other designs of the organic light-emitting display panel, such as the composition of the light-emitting diode and the electrode material, etc., can be made according to the current technology. Moderate adjustment. In addition, the above embodiments take the organic light emitting display panel as an example to illustrate the features of the present invention, but the flat display panel of the present invention is not limited to the organic light emitting display panel.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (10)

1. two-d display panel comprises:

One first substrate;

One second substrate, this second substrate zone is divided into a plurality of pixel regions, and each pixel region comprises a viewing area and a non-display area;

One black matrix pattern is located at a surface of this second substrate, and this black matrix pattern is arranged at respectively within this non-display area; And

One brightening piece is located at this second substrate back in a surface of this first substrate;

Wherein the area of this black matrix pattern in each pixel region account for its pairing respectively this pixel region area 70% to 95% between.

2. two-d display panel as claimed in claim 1, wherein this black matrix pattern is located at the surface of this second real estate to this first substrate.

3. two-d display panel as claimed in claim 1 also comprises a color filter patterns, is located at the surface of this second real estate to this first substrate, and this color filter patterns is positioned at respectively within this viewing area.

4. two-d display panel as claimed in claim 1, wherein this black matrix pattern is located at this second substrate this surface back to this first substrate.

5. two-d display panel as claimed in claim 1 also comprises a color filter patterns, is located at this second substrate this surface back to this first substrate, and this color filter patterns is positioned at respectively within this viewing area.

6. two-d display panel as claimed in claim 1, wherein this brightening piece utilization attaching mode is formed on this second substrate.

7. two-d display panel as claimed in claim 1, wherein this brightening piece directly is formed on this second substrate.

8. two-d display panel as claimed in claim 1, wherein this second substrate is a display surface back to this surface in this first substrate.

9. two-d display panel as claimed in claim 1, wherein this two-d display panel is an organic electroluminescence display panel.

10. two-d display panel comprises:

Transparent upper substrate, this two-d display panel is luminous from this upper substrate, and this upper substrate is divided into a plurality of pixel regions, and each pixel region comprises a viewing area and a non-display area;

Infrabasal plate, this infrabasal plate engages with this upper substrate, and keeps a constant spacing;

Black matrix pattern is located on the surface of this upper substrate, and this black matrix pattern is arranged at respectively within this non-display area; And

Brightening piece is located at this upper substrate back in a surface of this infrabasal plate;

Wherein the area of this black matrix pattern in each pixel region account for its pairing respectively this pixel region area 70% to 95% between.

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