JP7273936B2 - 表示装置 - Google Patents
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- JP7273936B2 JP7273936B2 JP2021203280A JP2021203280A JP7273936B2 JP 7273936 B2 JP7273936 B2 JP 7273936B2 JP 2021203280 A JP2021203280 A JP 2021203280A JP 2021203280 A JP2021203280 A JP 2021203280A JP 7273936 B2 JP7273936 B2 JP 7273936B2
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- transistor
- wiring
- layer
- conductive layer
- semiconductor layer
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- 239000004065 semiconductor Substances 0.000 claims description 332
- 239000003990 capacitor Substances 0.000 claims description 20
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Description
本実施の形態では、本発明の一態様の表示装置について説明する。
図1に、本発明の一態様の表示装置10のブロック図を示している。表示装置10は、表示部17と、ゲートドライバ12aと、ゲートドライバ12bと、ソースドライバ13aと、ソースドライバ13bと、を有する。表示部17には、画素11がマトリクス状に設けられる。なお、本明細書等において、i行j列目の画素11を画素11(i,j)と記載する。
以下では、表示装置10の表示部17に配置される画素の構成例について説明する。
以下では、表示装置の断面構成の一例について説明する。
図9に、図8(A)中の切断線A1-A2に対応する断面の一例を示す。ここでは、表示素子として透過型の液晶素子20を適用した場合の例を示している。図9において、基板15側が表示面側となる。
図10に、図8(A)中の切断線B1-B2に対応する断面の一例を示す。図10に示すトランジスタ30は、ゲートとしての機能を有する導電層31と、ゲート絶縁層としての機能を有する絶縁層34と、半導体層32と、ソース領域およびドレイン領域としての機能を有する一対の不純物半導体層35と、ソースおよびドレインとしての機能を有する一対の導電層33aおよび導電層51と、を有する。半導体層32の、導電層31と重畳する部分は、チャネル形成領域としての機能を有する。不純物半導体層35は半導体層32と接して設けられ、導電層33aおよび導電層51は不純物半導体層35と接して設けられる。
図11に、図10に示す構成の変形例を示す。図11では、着色層41を基板14側に設けた場合の例を示している。これにより、基板15側の構成を簡略化することができる。
図12に、図10に示す構成の変形例を示す。図12では、導電層52、導電層53、導電層54、開口部72、および開口部73を省略した場合の例を示している。この場合、導電層51と導電層33cは、導電層21と同一のレイヤーに形成された導電層55を介して電気的に接続されている。具体的には、開口部71を介して導電層51と導電層55が電気的に接続され、開口部74を介して導電層33cと導電層55が電気的に接続されている。図12に示す構成を用いる場合にも、導電層51と導電層33bが短絡することを抑制することができる。
図13に、図9に示す構成の変形例を、図14に、図10に示す構成の変形例を、図15に、図11に示す構成の変形例を、図16に、図12に示す構成の変形例をそれぞれ示す。図13乃至図16に示す構成は、不純物半導体層35を有しない点が、図9乃至図12に示す構成と異なる。
以下では、上記に示す各構成要素について説明する。
表示パネルが有する基板には、平坦面を有する材料を用いることができる。表示素子からの光を取り出す基板には、該光を透過する材料を用いる。例えば、ガラス、石英、セラミック、サファイヤ、有機樹脂等の材料を用いることができる。
トランジスタは、ゲートとしての機能を有する導電層と、半導体層と、ソースとしての機能を有する導電層と、ドレインとしての機能を有する導電層と、ゲート絶縁層としての機能を有する絶縁層と、を有する。
トランジスタに用いる半導体層の結晶性は特に限定されず、非晶質半導体、結晶性を有する半導体(微結晶半導体、多結晶半導体、単結晶半導体、または一部に結晶領域を有する半導体)のいずれを用いてもよい。結晶性を有する半導体を用いると、トランジスタ特性の劣化を抑制できるため好ましい。
トランジスタのゲート、ソースおよびドレインのほか、表示装置を構成する各種配線および電極等の導電層に用いることのできる材料としては、アルミニウム、チタン、クロム、ニッケル、銅、イットリウム、ジルコニウム、モリブデン、銀、タンタル、またはタングステン等の金属、またはこれを主成分とする合金等が挙げられる。またこれらの材料を含む膜を単層で、または積層構造として用いることができる。例えば、シリコンを含むアルミニウム膜の単層構造、チタン膜上にアルミニウム膜を積層する二層構造、タングステン膜上にアルミニウム膜を積層する二層構造、銅-マグネシウム-アルミニウム合金膜上に銅膜を積層する二層構造、チタン膜上に銅膜を積層する二層構造、タングステン膜上に銅膜を積層する二層構造、チタン膜または窒化チタン膜と、その上に重ねてアルミニウム膜または銅膜を積層し、さらにその上にチタン膜または窒化チタン膜を形成する三層構造、モリブデン膜または窒化モリブデン膜と、その上に重ねてアルミニウム膜または銅膜を積層し、さらにその上にモリブデン膜または窒化モリブデン膜を形成する三層構造等がある。なお、酸化インジウム、酸化錫または酸化亜鉛等の酸化物を用いてもよい。また、マンガンを含む銅を用いると、エッチングによる形状の制御性が高まるため好ましい。
各絶縁層に用いることのできる絶縁材料としては、例えば、アクリル、エポキシ等の樹脂、シロキサン結合を有する樹脂の他、酸化シリコン、酸化窒化シリコン、窒化酸化シリコン、窒化シリコン、酸化アルミニウム等の無機絶縁材料を用いることもできる。
液晶素子としては、例えば垂直配向(VA:Vertical Alignment)モードが適用された液晶素子を用いることができる。垂直配向モードとしては、MVA(Multi-Domain Vertical Alignment)モード、PVA(Patterned Vertical Alignment)モード、ASV(Advanced Super View)モード等を用いることができる。
着色層に用いることのできる材料としては、金属材料、樹脂材料、顔料または染料が含まれた樹脂材料等が挙げられる。
遮光層として用いることのできる材料としては、カーボンブラック、チタンブラック、金属、金属酸化物、複数の金属酸化物の固溶体を含む複合酸化物等が挙げられる。遮光層は、樹脂材料を含む膜であってもよいし、金属等の無機材料の薄膜であってもよい。また、遮光層に、着色層の材料を含む膜の積層膜を用いることもできる。例えば、ある色の光を透過する着色層に用いる材料を含む膜と、他の色の光を透過する着色層に用いる材料を含む膜との積層構造を用いることができる。着色層と遮光層とを同じ材料で形成することで、同じ装置を用いることができるほか工程を簡略化できるため好ましい。
以下では、表示装置10の作製方法例について説明する。
図10に示す構成の、画素11(i+3,j)等の作製方法の一例を図17乃至図19に示す。表示装置10の作製の際は、まず、基板14上に導電層を成膜する。次に、フォトリソグラフィ法等によりパターニングを行い、エッチング法等により当該導電層を加工することにより、導電層31、導電層31a、および導電層53を形成する(図17(A))。前述のように、導電層31は配線G3の一部に対応し、導電層31aは配線CSの一部に対応する。
図14に示す構成の、画素11(i+3,j)等の作製方法の一例を図20乃至図22に示す。図20(A)、(B)、(C)、図21(A)、(B)、および図22(A)、(B)は、それぞれ図17(A)、(B)、(C)、図18(A)、(B)、および図19(A)、(B)に対応する。図20乃至図22に示す作製方法は、図20(B)に示す工程において不純物半導体層35を形成しない点が、先述の作製方法と異なる。
ゲート線やソース線等の配線に用いることのできる導電層は、金属や合金等の低抵抗な材料を用いると、配線抵抗を低減することができるため好ましい。また、大画面の表示装置を作製する場合には、配線の幅を大きくすることも有効である。しかしながら、このような導電層は可視光を透過しないため、透過型の液晶表示装置においては、配線自体の幅が大きくなることや、配線数の増加に伴い、開口率の低下を招く場合がある。
本実施の形態では、上記実施の形態に示した表示装置等に用いることができるトランジスタの一例について、図面を用いて説明する。
以下では、図9乃至図12等に示したトランジスタの変形例について説明する。
以下では、図13乃至図16等に示したトランジスタの変形例について説明する。
本実施の形態では、トランジスタの半導体層に用いることのできる多結晶シリコンの結晶化方法およびレーザ結晶化装置の一例について説明する。
以下では、本発明の一態様で開示されるトランジスタに用いることができるCAC-OSの構成について説明する。
本実施の形態では、上記実施の形態で説明した表示装置の他の構成例について説明する。
本実施の形態では、本発明の一態様の電子機器について、図面を参照して説明する。
図34(A)は、本実施例で用いたディスプレイモジュールの構成を示すブロック図である。当該構成では、ゲート線1本ずつに選択信号が供給され、画素が1つずつ選択される。ゲートドライバおよびソースドライバはともに外付けである。ゲート線には、2つのゲートドライバIC(Gate Driver IC(External))から同じ信号が供給される。ソース線には、1つのソースドライバIC(Source Driver IC(External))から信号が供給される。画素領域は分割されていない。画素領域のサイズは対角65インチであり、有効画素数は7680×RGB(H)×4320(V)である。
図38(A)は、本実施例で用いたディスプレイモジュールの構成を示すブロック図である。当該構成では、2本のゲート線に同時に選択信号が供給され、列方向に隣接する画素が2つ同時に選択される。ゲートドライバおよびソースドライバはともに外付けである。ゲート線には、2つのゲートドライバICから同じ信号が供給される。ゲート線GL0(i)は、ゲート線GL(i)およびゲート線GL(i+1)と電気的に接続されており、i行目と(i+1)行目の2行の画素は同時に駆動する。ソース線には、1つのソースドライバICから信号が供給される。画素領域は分割されていない。画素領域のサイズは対角65インチであり、有効画素数は7680×RGB(H)×4320(V)である。
本実施例で用いたディスプレイモジュールの構成を示すブロック図は、ソースドライバ13が1個のみ設けられる構成とした他は図1と同様である。画素領域のサイズは対角65インチであり、有効画素数は7680×RGB(H)×4320(V)である。また、画素領域に設けられた画素の回路図は図7と同様であり、画素レイアウトは図8(A)、(B)と同様である。
11 画素
12a ゲートドライバ
12b ゲートドライバ
13 ソースドライバ
13a ソースドライバ
13b ソースドライバ
14 基板
15 基板
16 基準電圧生成回路
16a 基準電圧生成回路
16b 基準電圧生成回路
17 表示部
18a 保護回路
18b 保護回路
19a 保護回路
19b 保護回路
20 液晶素子
21 導電層
22 液晶
23 導電層
24a 配向膜
24b 配向膜
26 絶縁層
30 トランジスタ
31 導電層
31a 導電層
32 半導体層
32p 半導体層
33 導電層
33a 導電層
33b 導電層
33c 導電層
34 絶縁層
35 不純物半導体層
37 半導体層
38 開口部
39a 偏光板
39b 偏光板
41 着色層
42 遮光層
50 光
51 導電層
52 導電層
53 導電層
54 導電層
55 導電層
60 容量素子
71 開口部
72 開口部
73 開口部
74 開口部
81 絶縁層
82 絶縁層
84 絶縁層
90 バックライトユニット
121a TABテープ
121b TABテープ
131a プリント基板
131b プリント基板
132a TABテープ
132b TABテープ
200a トランジスタ
200b トランジスタ
200c トランジスタ
200d トランジスタ
200e トランジスタ
200f トランジスタ
211 絶縁層
212 絶縁層
212a 絶縁層
212b 絶縁層
212c 絶縁層
212d 絶縁層
215 絶縁層
216 絶縁層
216a 絶縁層
221 導電層
222a 導電層
222a_1 導電層
222a_2 導電層
222a_3 導電層
222b 導電層
222b_1 導電層
222b_2 導電層
222b_3 導電層
223 導電層
224 絶縁層
231 半導体層
231_1 半導体層
231_2 半導体層
231d ドレイン領域
231i チャネル形成領域
231s ソース領域
235 開口部
236a 開口部
236b 開口部
237 開口部
238a 開口部
238b 開口部
812 移動機構
813 移動機構
815 ステージ
816 ボールネジ機構
820 レーザ発振器
821 光学系ユニット
822 ミラー
823 マイクロレンズアレイ
824 マスク
825 レーザ光
826 レーザ光
827 レーザビーム
830 基板
840 非晶質シリコン層
841 多結晶シリコン層
7000 表示部
7100 テレビジョン装置
7101 筐体
7103 スタンド
7111 リモコン操作機
7200 ノート型パーソナルコンピュータ
7211 筐体
7212 キーボード
7213 ポインティングデバイス
7214 外部接続ポート
7300 デジタルサイネージ
7301 筐体
7303 スピーカ
7311 情報端末機
7400 デジタルサイネージ
7401 柱
7411 情報端末機
Claims (3)
- 複数の画素がマトリクス状に配置された表示装置であって、
平面視において第1の方向に延伸する領域を有する第1のソース線と、
平面視において前記第1の方向に延伸する領域を有し、且つ前記第1の方向に直交する第2の方向において前記第1のソース線と隣接する第2のソース線と、
平面視において前記第2の方向に延伸する領域を有する、第1のゲート線及び第2のゲート線と、
平面視において前記第2の方向に延伸する領域を有し、且つ、容量電極として機能する領域を有する、第1の配線及び第2の配線と、
前記第1のソース線及び前記第1のゲート線と電気的に接続する第1のトランジスタと、前記第1の配線と電気的に接続する第1の容量素子と、を有する第1の画素と、
前記第1の画素と同一列に設けられ、且つ、前記第2のソース線及び前記第2のゲート線と電気的に接続する第2のトランジスタと、前記第2の配線と電気的に接続する第2の容量素子と、を有する第2の画素と、を有し、
前記第1のトランジスタの半導体層は、前記第1のソース線と異なるレイヤーに設けられた第1の導電層を介して、前記第1のソース線と電気的に接続され、
平面視において、前記第1のゲート線は、前記第1の配線と前記第2の配線との間で、前記第2の配線よりも前記第1の配線に近い位置に設けられ、
平面視において、前記第2の配線は、前記第1のゲート線と前記第2のゲート線との間に設けられ、
平面視において、前記第1の配線及び前記第2の配線の各々は、部分的に拡幅した領域を有し、
前記部分的に拡幅した領域は、前記第1のソース線と同一レイヤーに設けられた第2の導電層と重なる領域を有し、
前記部分的に拡幅した領域は、前記容量電極として機能する領域を有する、表示装置。 - 複数の画素がマトリクス状に配置された表示装置であって、
平面視において第1の方向に延伸する領域を有する第1のソース線と、
平面視において前記第1の方向に延伸する領域を有し、且つ前記第1の方向に直交する第2の方向において前記第1のソース線と隣接する第2のソース線と、
平面視において前記第2の方向に延伸する領域を有する、第1のゲート線及び第2のゲート線と、
平面視において前記第2の方向に延伸する領域を有し、且つ、容量電極として機能する領域を有する、第1の配線及び第2の配線と、
前記第1のソース線及び前記第1のゲート線と電気的に接続する第1のトランジスタと、前記第1の配線と電気的に接続する第1の容量素子と、を有する第1の画素と、
前記第1の画素と同一列に設けられ、且つ、前記第2のソース線及び前記第2のゲート線と電気的に接続する第2のトランジスタと、前記第2の配線と電気的に接続する第2の容量素子と、を有する第2の画素と、を有し、
前記第1のトランジスタの半導体層は、前記第1のソース線と異なるレイヤーに設けられた第1の導電層を介して、前記第1のソース線と電気的に接続され、
平面視において、前記第1のゲート線は、前記第1の配線と前記第2の配線との間に設けられ、
平面視において、前記第2の配線は、前記第1のゲート線と前記第2のゲート線との間で、前記第1のゲート線よりも前記第2のゲート線に近い位置に設けられ、
平面視において、前記第1の配線及び前記第2の配線の各々は、部分的に拡幅した領域を有し、
前記部分的に拡幅した領域は、前記第1のソース線と同一レイヤーに設けられた第2の導電層と重なる領域を有し、
前記部分的に拡幅した領域は、前記容量電極として機能する領域を有する、表示装置。 - 複数の画素がマトリクス状に配置された表示装置であって、
平面視において第1の方向に延伸する領域を有する第1のソース線と、
平面視において前記第1の方向に延伸する領域を有し、且つ前記第1の方向に直交する第2の方向において前記第1のソース線と隣接する第2のソース線と、
平面視において前記第2の方向に延伸する領域を有する、第1のゲート線及び第2のゲート線と、
平面視において前記第2の方向に延伸する領域を有し、且つ、容量電極として機能する領域を有する、第1の配線及び第2の配線と、
前記第1のソース線及び前記第1のゲート線と電気的に接続する第1のトランジスタと、前記第1の配線と電気的に接続する第1の容量素子と、を有する第1の画素と、
前記第1の画素と同一列に設けられ、且つ、前記第2のソース線及び前記第2のゲート線と電気的に接続する第2のトランジスタと、前記第2の配線と電気的に接続する第2の容量素子と、を有する第2の画素と、を有し、
前記第1のトランジスタの半導体層は、前記第1のソース線と異なるレイヤーに設けられた第1の導電層を介して、前記第1のソース線と電気的に接続され、
平面視において、前記第1のゲート線は、前記第1の配線と前記第2の配線との間で、前記第2の配線よりも前記第1の配線に近い位置に設けられ、
平面視において、前記第2の配線は、前記第1のゲート線と前記第2のゲート線との間で、前記第1のゲート線よりも前記第2のゲート線に近い位置に設けられ、
平面視において、前記第1の配線及び前記第2の配線の各々は、部分的に拡幅した領域を有し、
前記部分的に拡幅した領域は、前記第1のソース線と同一レイヤーに設けられた第2の導電層と重なる領域を有し、
前記部分的に拡幅した領域は、前記容量電極として機能する領域を有する、表示装置。
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