TWI692089B - Display device - Google Patents

Abstract

A display device includes a first substrate, a first active element, a second element, a first data line, a color conversion layer, a protection layer, a planarization layer, a shielding electrode, a first pixel electrode, a second pixel electrode, a second substrate, and a display medium layer. The first data line is disposed between the first active element and the second active element. The color conversion layer is disposed on the first active element and the second active element. The first pixel electrode and the second pixel electrode are electrically connected with the first active element and the second active element respectively. The first pixel electrode and the second pixel electrode have a gap therebetween. The first data line overlaps the gap, a portion of the first pixel electrode, and a portion of the second electrode. The shielding electrode overlaps the first pixel electrode, the second pixel electrode, the first data line, and the gap.

Description

Display device

The present invention relates to a display device, and particularly to a display device in which a data line overlaps a gap between pixel electrodes.

With the advancement of technology, the application of curved display devices is becoming more and more widespread. For example, curved display devices have been widely used in mobile phones, wearable devices, and televisions. Curved display devices can be added to electronic devices that are often used in life, which also represents a large market potential for curved display devices.

Generally speaking, a black matrix (BM) is provided in the liquid crystal display device. The black matrix is used to block the poorly arranged part of the liquid crystal, thereby avoiding light leakage of the liquid crystal display device. Currently, curved display devices are often manufactured by bending liquid crystal display devices. However, in the process of bending the liquid crystal display device, the black matrix often deviates from the position to be blocked, which may easily cause light leakage of the bent liquid crystal display device (ie, curved display device).

The invention provides a display device which can improve the light leakage problem after bending.

At least one embodiment of the present invention provides a display device including a first substrate, a first active element, a second active element, a first data line, a color conversion layer, a protective layer, a flat layer, a shielding electrode, and a first pixel electrode , A second pixel electrode, a second substrate and a display medium layer. The first active element and the second active element are located on the first substrate. The first data line is located between the first active component and the second active component. The color conversion layer is located on the first active device and the second active device. The color conversion layer has a first opening and a second opening. The positions of the first opening and the second opening correspond to the drain of the first active element and the drain of the second active element, respectively. The protective layer is located on the color conversion layer. The flat layer is on the protective layer. The shielding electrode is located between the protective layer and the flat layer. The shielding electrode has a first through hole and a second through hole. The positions of the first through hole and the second through hole correspond to the first opening and the second opening, respectively. The first pixel electrode and the second pixel electrode are located on the flat layer. The first pixel electrode and the second pixel electrode are electrically connected to the first active element and the second active element, respectively. There is a gap between the first pixel electrode and the second pixel electrode. The first data line overlaps the gap, part of the first pixel electrode and part of the second pixel electrode. The shielding electrode overlaps the first pixel electrode, the second pixel electrode, the first data line and the gap. The shielding electrode shields the gap. The second substrate faces the first substrate. The display medium layer is located between the first substrate and the second substrate.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

FIG. 1A is a schematic top view of a display device according to an embodiment of the invention. Fig. 1B is a schematic cross-sectional view taken along line aa' of Fig. 1A. Fig. 1C is a schematic cross-sectional view taken along line bb' of Fig. 1A. For convenience of description, FIG. 1A omits the drawing of some components in FIGS. 1B and 1C.

1A to 1C, the display device 10 includes a first substrate SB1, a first active element T1, a second active element T2, a first data line DL1, a color conversion layer CF, a protective layer PV2, an insulating layer U, a shielding electrode SE, first pixel electrode PE1, second pixel electrode PE2, second substrate SB2, and display medium layer M. In this embodiment, the display device 10 further includes a first polarizer PL1, a second polarizer PL2, a black matrix BM, a protective layer PV1, a conductive line CL, a first scan line SL1, a second scan line SL2, and a second data line DL2, third active element T3, fourth active element T4, third pixel electrode PE3, fourth pixel electrode PE4, first alignment layer AL1, second alignment layer AL2, common electrode CE, cover layer OC and spacer PS.

The first active element T1, the second active element T2, the third active element T3, and the fourth active element T4 are located on the first substrate SB1. The first active element T1, the second active element T2, the third active element T3, and the fourth active element T4 each include a channel layer AS, a gate G, a source S, and a drain D.

The gate G, the first scan line SL1, the second scan line SL2, and the conductive line CL are located on the substrate SB1. In this embodiment, the gate G, the first scan line SL1, the second scan line SL2, and the conductive line CL belong to the same conductivity膜层。 Film layer. The gate G is electrically connected to the corresponding scan line. For example, the gate G of the first active element T1 and the gate G of the second active element T2 are electrically connected to the first scan line SL1, and the third active element The gate G of T3 and the gate G of the fourth active element T4 are electrically connected to the second scan line SL2.

The channel layer AS overlaps the corresponding gate G, and a gate insulating layer GI is sandwiched between the channel layer AS and the gate G.

The source S and the drain D are located on the corresponding channel layer AS, and the source S and the drain D are electrically connected to the corresponding channel layer AS. The first data line DL1 and the second data line DL2 are located on the gate insulating layer GI, and the first data line DL1 and the second data line DL2 are electrically connected to the corresponding source electrode S. For example, the first data line DL1 is electrically Is electrically connected to the source S of the first active device T1 and the source S of the third active device T3, and the second data line DL2 is electrically connected to the source S of the second active device T2 and the source of the fourth active device T4极S. The first data line DL1 is located between the first active element T1 and the second active element T2. In this embodiment, both the first data line DL1 and the second data line DL2 include a connected first portion X1 and a second portion X2. The width W of the second portion X2 is greater than the width y of the first portion X1. The position of the first part X1 corresponds to, for example, the first active element T1, the second active element T2, the third active element T3, and the fourth active element T4, whereby the first active element T1, the second active element T2, the third active element The element T3 and the fourth active element T4 can have a larger layout space.

The protective layer PV1 covers the source electrode S, the drain electrode D, the first data line DL1, the second data line DL2 and the gate insulating layer GI.

The color conversion layer CF is located on the protective layer PV1. In this embodiment, the color conversion layer CF is located on the first active element T1, the second active element T2, the third active element T3, and the fourth active element T4. For example, the color conversion layer CF is a color filter layer, and the display device 10 has a color filter on array (COA) structure. The color conversion layer CF includes, for example, a red color conversion layer, a green color conversion layer, and a blue color conversion layer, and color conversion layers of different colors are interleaved.

The color conversion layer CF has a first opening O1, a second opening O2, a third opening O3, and a fourth opening O4. The positions of the first opening O1, the second opening O2, the third opening O3, and the fourth opening O4 respectively correspond to the drain D of the first active element T1, the drain D of the second active element T2, and the drain of the third active element T3 The pole D and the drain D of the fourth active element T4.

The protective layer PV2 is located on the color conversion layer CF. The shielding electrode SE is located on the protective layer PV2. The flat layer U is located on the shielding electrode SE and the protective layer PV2. In other words, the shield electrode SE is located between the protective layer PV2 and the flat layer U. The shield electrode SE has a first through hole TH1, a second through hole TH2, a third through hole TH3, and a fourth through hole TH4. The positions of the first through hole TH1, the second through hole TH2, the third through hole TH3, and the fourth through hole TH4 correspond to the first opening O1, the second opening O2, the third opening O3, and the fourth opening O4, respectively.

The shielding electrode SE has a first opening C1, a second opening C2, a third opening C3, and a fourth opening C4. The positions and sizes of the first opening C1, the second opening C2, the third opening C3, and the fourth opening C4 correspond to the channel layer AS of the first active element T1, the channel layer AS of the second active element T2, the first The channel layer AS of the three active elements T3 and the channel layer AS of the fourth active element T4. In this embodiment, the shielding electrode SE does not overlap the channel layer AS of the first active element T1, the channel layer AS of the second active element T2, the channel layer AS of the third active element T3, and the channel layer of the fourth active element T4 AS, thereby preventing the electric field on the shielding electrode SE from affecting the operation of the first active element T1, the second active element T2, the third active element T3, and the fourth active element T4. In other embodiments, the shielding electrode SE may not have the first opening C1, the second opening C2, the third opening C3, and the fourth opening C4.

The flat layer U is, for example, photosensitive acrylic resin or other organic insulating materials, but the invention is not limited thereto. The thickness of the flat layer U is, for example, 1 micrometer to 4 micrometers. The flat layer U can improve the aperture ratio and brightness of the display device 10. In this embodiment, the flat layer U is filled into the first opening O1, the second opening O2, the third opening O3, and the fourth opening O4, and has corresponding to the first opening O1, the second opening O2, and the third opening O3, respectively And multiple openings of the fourth opening O4. In other words, the flat layer U exposes the drain D at the bottom of the first opening O1, the second opening O2, the third opening O3, and the fourth opening O4.

The first pixel electrode PE1, the second pixel electrode PE2, the third pixel electrode PE3 and the fourth pixel electrode PE4 are located on the flat layer U.

The first pixel electrode PE1, the second pixel electrode PE2, the third pixel electrode PE3 and the fourth pixel electrode PE4 are electrically connected to the first active element T1, the second active element T2, the third active element T3 and the first Four active components T4. There is a gap GP between the first pixel electrode PE1 and the second pixel electrode PE2 and between the third pixel electrode PE3 and the fourth pixel electrode PE4. The first data line DL1 overlaps the gap GP, part of the first pixel electrode PE1, part of the second pixel electrode PE2, part of the third pixel electrode PE3, and part of the fourth pixel electrode PE4. For example, the second portion X2 of the first data line DL1 overlaps the gap GP, part of the first pixel electrode PE1, part of the second pixel electrode PE2, part of the third pixel electrode PE3, and part of the fourth pixel electrode PE4 .

The shielding electrode SE overlaps the first pixel electrode PE1, the second pixel electrode PE2, the third pixel electrode PE3, the fourth pixel electrode PE4, the first data line DL1, the second data line DL2 and the gap GP, and shields The electrode SE shields the gap GP. The shielding electrode SE can reduce the electric field generated by the first data line DL1 and the second data line DL2 on the first pixel electrode PE1, the second pixel electrode PE2, the third pixel electrode PE3, and the fourth pixel electrode PE4 influences. In addition, the shielding electrode SE has the effects of improving the orientation polarization problem, increasing the storage capacitance, and reducing the parasitic capacitance.

The first alignment layer AL1 is located on the first pixel electrode PE1, the second pixel electrode PE2, the third pixel electrode PE3, and the fourth pixel electrode PE4. The first alignment layer AL1 has a first alignment direction.

The second substrate SB2 faces the first substrate SB1. The black matrix BM, the cover layer OC, the common electrode CE, and the second alignment layer AL2 are located on the second substrate SB2. The black matrix BM overlaps the first scan line SL1, the second scan line SL2, the first active element T1, the second active element T2, the third active element T3, the fourth active element T4, and the conductive line CL. The black matrix BM has openings corresponding to the first pixel electrode PE1, the second pixel electrode PE2, the third pixel electrode PE3, and the fourth pixel electrode PE4. In this embodiment, the gap GP between the first pixel electrode PE1 and the second pixel electrode PE2 and between the third pixel electrode PE3 and the fourth pixel electrode PE4 does not overlap the black matrix BM.

The cover layer OC is located on the black matrix BM. The common electrode CE is located on the cover layer OC. In this embodiment, the common electrode CE and the shielding electrode SE are electrically connected to the same voltage, thereby further improving the shielding effect of the shielding electrode SE, but the invention is not limited thereto. Since the shield electrode SE and the common electrode CE overlapping the gap GP are electrically connected to the same voltage, the liquid crystal molecules around the gap GP are not easily affected by the voltage conversion of the first data line DL1. However, under the black screen, the liquid crystal molecules around the gap GP are in a light-transmitting state because the voltage difference sensed is zero, and the light can be blocked by the first data line DL1 below the gap GP.

The second alignment layer AL2 is located on the common electrode CE. The second alignment layer AL2 has a second alignment direction. In this embodiment, the second alignment direction of the second alignment layer AL2 and the first alignment direction of the first alignment layer AL1 are orthogonal to each other. The first alignment layer AL1 and the second alignment layer AL2 are aligned by a rubbing process, for example. In this embodiment, the first substrate SB1 further has a first polarizer PL1, and the absorption axis of the first polarizer PL1 is perpendicular to the first alignment direction of the first alignment layer AL1. In this embodiment, the second substrate SB2 further has a second polarizer PL2, and the absorption axis of the second polarizer PL2 is perpendicular to the second alignment direction of the second alignment layer AL2. In other words, the display device 10 in this embodiment is a twisted nematic (TN) liquid crystal display device. In some embodiments, the first substrate SB1 and the second substrate SB2 respectively have two polarizers with absorption axes orthogonal to each other, but the invention is not limited thereto.

The display medium layer M is located between the first substrate SB1 and the second substrate SB2. For example, the display medium layer M is located between the first alignment layer AL1 and the second alignment layer AL2. The display medium layer M includes, for example, liquid crystal molecules. In this embodiment, when an electric field is not applied to the display medium layer M, the liquid crystal molecules are arranged in a spiral shape, and light can leave the display device 10. If the liquid crystal molecules are gradually aligned in the vertical direction after power-on, the polarized light cannot pass through the second polarizer PL2 on the second substrate SB2, and a black screen is displayed.

The spacer PS is located between the first substrate SB1 and the second substrate SB2. For example, the spacer PS is located between the first alignment layer AL1 and the second alignment layer AL2. The spacer PS can be used to maintain the thickness of the display medium layer M (or cell gap). In this embodiment, the spacer PS overlaps the first active element T1, the second active element T2, the third active element T3, and the fourth active element T4, whereby the spacer PS can better control the display medium layer M thickness of. In some embodiments, the spacer PS is formed on the first substrate SB1 and is made by a process of forming a photo spacer on array (POA), thereby the display device 10 has a higher Opening ratio, but the invention is not limited to this. In other embodiments, the spacer PS is formed on the second substrate SB2.

In some embodiments, the display device 10 is bent to obtain a curved display device. For example, the bending axis of the curved display device is parallel to the extending direction of the first data line DL1 and the second data line DL2, for example. After the display device 10 is bent, the distance between the black matrix BM and the pixel electrodes (such as the first pixel electrode PE1, the second pixel electrode PE2, the third pixel electrode PE3 and the fourth pixel electrode PE4) Large, the partial gap GP tends to deviate from the black matrix BM after the display device 10 is bent, and it can also be said that the partial gap GP does not overlap the black matrix BM in the direction perpendicular to the black matrix BM. For example, the black matrix BM deviates from the gap GP along the extending direction of the first scan line SL1 and the second scan line SL2. However, since the first data line DL1 overlaps the gap GP, part of the first pixel electrode PE1 and part of the second pixel electrode PE2, even if part of the black matrix BM deviates from the gap GP, the gap GP can still be shielded by the first data line DL1 , Thereby avoiding the light leakage problem of the display device 10.

In this embodiment, there is a vertical distance between the first data line DL1 and the pixel electrodes (for example, the first pixel electrode PE1, the second pixel electrode PE2, the third pixel electrode PE3 and the fourth pixel electrode PE4) H. The first data line DL1 has a width W, H/W<23%. In this embodiment, the width Z of the gap GP between the first pixel electrode PE1 and the second pixel electrode PE2 (or between the third pixel electrode PE3 and the fourth pixel electrode PE4) is less than or equal to the width W . The ratio of the thickness LH of the display medium layer M to the width W of the first data line DL1 is less than 0.21.

2 is a simulation diagram of viewing angle brightness of a display device according to some embodiments of the present invention. For example, the structure of the display device represented by each curve in FIG. 2 is similar to the display device 10 of FIG. 1A, however, the width W of the first data line DL1 of the display device represented by each curve in FIG. 2 varies. the same.

The vertical axis of FIG. 2 represents the ratio of the brightness of the corresponding viewing angle to the brightness of the front viewing angle (0 degrees) divided by 50. For example, when the viewing angle is 0 degrees (that is, the front viewing angle), the aforementioned ratio is 1 and the value corresponding to the vertical axis of FIG. 2 is 1 divided by 50 (that is, 0.02). When the ratio of the 60-degree viewing angle to the front viewing angle is less than 150 (that is, the vertical axis is less than 3 in FIG. 2), the display device has better viewing quality.

Please refer to FIG. 2, when the width W of the first data line DL1 is greater than 14 μm, the value of the vertical axis is less than 3, and the display device has better viewing quality.

In summary, in the display device of the present invention, even if a part of the gap deviates from the black matrix, the light leakage problem of the display device can still be avoided.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

10: display device AS: channel layer AL1: the first alignment layer AL2: second alignment layer BM: Black matrix C1: the first opening C2: Second opening C3: third opening C4: Fourth opening CE: Common electrode CF: color conversion layer CL: wire D: Jiji DL1: the first data line DL2: The second data line G: gate GI: gate insulation GP: clearance H: vertical distance LH: thickness M: display medium layer O1: the first opening O2: second opening O3: third opening O4: Fourth opening OC: Overlay PE1: the first pixel electrode PE2: second pixel electrode PE3: third pixel electrode PE4: fourth pixel electrode PL1: the first polarizer PL2: second polarizer PS: gap PV1, PV2: protective layer S: source SB1: the first substrate SB2: second substrate SE: shielding electrode SL1: first scan line SL2: second scan line T1: the first active component T2: second active component T3: third active component T4: fourth active component TH1: the first through hole TH2: second through hole TH3: third through hole TH4: fourth through hole U: insulating layer W, y, Z: width X1: Part One X2: Part Two

FIG. 1A is a schematic top view of a display device according to an embodiment of the invention. Fig. 1B is a schematic cross-sectional view taken along line aa' of Fig. 1A. Fig. 1C is a schematic cross-sectional view taken along line bb' of Fig. 1A. 2 is a simulation diagram of viewing angle brightness of a display device according to some embodiments of the present invention.

10: display device

AS: channel layer

C1: the first opening

C2: Second opening

C3: third opening

C4: Fourth opening

CF: color conversion layer

CL: wire

D: Jiji

DL1: the first data line

DL2: The second data line

G: gate

GP: clearance

O1: the first opening

O2: second opening

O3: third opening

O4: Fourth opening

PE1: the first pixel electrode

PE2: second pixel electrode

PE3: third pixel electrode

PE4: fourth pixel electrode

PS: gap

S: source

SB1: the first substrate

SE: shielding electrode

SL1: first scan line

SL2: second scan line

T1: the first active component

T2: second active component

T3: third active component

T4: fourth active component

TH1: the first through hole

TH2: second through hole

TH3: third through hole

TH4: fourth through hole

W, y: width

X1: Part One

X2: Part Two

Claims (12)

A display device, including: A first substrate; A first active component and a second active component are located on the first substrate; A first data line between the first active element and the second active element; A color conversion layer is located on the first active element and the second active element, and the color conversion layer has a first opening and a second opening, the positions of the first opening and the second opening correspond to the first A drain of an active element and a drain of the second active element; A protective layer on the color conversion layer; A flat layer on the protective layer; A shielding electrode is located between the protective layer and the flat layer, wherein the shielding electrode has a first through hole and a second through hole, and the positions of the first through hole and the second through hole correspond to the first The opening and the second opening; A first pixel electrode and a second pixel electrode are located on the flat layer, the first pixel electrode and the second pixel electrode are electrically connected to the first active element and the second active element respectively, and There is a gap between the first pixel electrode and the second pixel electrode, wherein the first data line overlaps the gap, part of the first pixel electrode and part of the second pixel electrode, the shielding electrode overlaps The first pixel electrode, the second pixel electrode, the first data line and the gap, and the shielding electrode shields the gap; A second substrate facing the first substrate; and A display medium layer is located between the first substrate and the second substrate. The display device as described in item 1 of the patent application scope further includes: A common electrode on the second substrate; A first alignment layer on the first pixel electrode and the second pixel electrode, and the first alignment layer has a first alignment direction; and A second alignment layer is located on the common electrode, and the second alignment layer has a second alignment direction. The display device according to item 1 of the patent application scope, wherein the shielding electrode has a first opening, and the position of the first opening corresponds to the channel layer of the first active element. The display device as described in item 1 of the patent application range, wherein the shielding electrode has no overlap with the channel layer of the first active element and the channel layer of the second active element. The display device as described in item 1 of the patent application range, wherein the first data line and the first pixel electrode have a vertical distance H, the first data line has a width W, and H/W<23%. The display device according to item 1 of the patent application scope, wherein the width of the gap between the first pixel electrode and the second pixel electrode is less than or equal to the width of the first data line. The display device as described in item 1 of the patent application range, wherein the ratio of the thickness of the display medium layer to the width of the first data line is less than 0.21. The display device as described in item 1 of the patent application, wherein the width of the first data line is greater than 14 microns. The display device as described in item 1 of the patent application scope further includes: A common electrode is located on the second substrate, wherein the common electrode and the shielding electrode are electrically connected to the same voltage. The display device according to item 1 of the patent application scope, wherein part of the flat layer is filled in the first opening and the second opening. The display device as described in item 1 of the patent application scope further includes: A spacer is located between the first substrate and the second substrate, and overlaps the first active device. The display device as described in item 1 of the patent application scope, wherein the first data line includes a connected first portion and a second portion, the second portion overlaps the gap, and the width of the second portion is greater than the first The width of a part.

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