JP2018087976A - 表示装置およびその作製方法、ならびに電子機器 - Google Patents
表示装置およびその作製方法、ならびに電子機器 Download PDFInfo
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- JP2018087976A JP2018087976A JP2017222582A JP2017222582A JP2018087976A JP 2018087976 A JP2018087976 A JP 2018087976A JP 2017222582 A JP2017222582 A JP 2017222582A JP 2017222582 A JP2017222582 A JP 2017222582A JP 2018087976 A JP2018087976 A JP 2018087976A
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- transistor
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Abstract
【解決手段】トランジスタと、容量素子と、を有する表示装置。トランジスタは、第1の絶縁層と、第1の絶縁層と接する第1の半導体層と、第1の半導体層と接する第2の絶縁層と、第2の絶縁層に設けられた開口部を介して、第1の半導体層と電気的に接続される第1の導電層と、を有し、第1の半導体層は、チャネル領域を有する。容量素子は、第1の絶縁層と接する第2の導電層と、第2の導電層と接する第2の絶縁層と、第2の絶縁層と接する第1の導電層と、を有し、第2の導電層は、第1の半導体層と同様の組成を有し、第1の導電層、および第2の導電層は、可視光を透過する機能を有する。
【選択図】図3
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図1乃至図12を用いて説明する。
まず、図1乃至図4を用いて、本発明の一態様の表示装置について説明する。
次に、本発明の一態様の表示装置が有する画素について、図3を用いて説明する。
なお、容量素子34の第1の電極は、例えば下部電極とすることができ、容量素子34の第2の電極は、例えば上部電極とすることができる。
次に、図5乃至図7を用いて、本発明の一態様の表示装置について説明する。図5は、表示装置100の斜視図である。図6は、表示装置100の断面図である。図5では、基板61を破線で示す。
本発明の一態様の表示装置が有する基板の材質等に大きな制限はなく、様々な基板を用いることができる。例えば、ガラス基板、石英基板、サファイア基板、半導体基板、セラミック基板、金属基板、またはプラスチック基板等を用いることができる。
半導体層に用いられる半導体材料は特に限定されず、例えば、酸化物半導体、シリコン、ゲルマニウム等が挙げられる。半導体層に用いる半導体材料の結晶性についても特に限定されず、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。
表示装置が有する各絶縁層、オーバーコート、スペーサ等に用いることのできる絶縁材料としては、有機絶縁材料または無機絶縁材料を用いることができる。有機絶縁材料としては、例えば、アクリル樹脂、エポキシ樹脂、ポリイミド樹脂、ポリアミド樹脂、ポリイミドアミド樹脂、シロキサン樹脂、ベンゾシクロブテン系樹脂、およびフェノール樹脂等が挙げられる。無機絶縁層としては、酸化シリコン膜、酸化窒化シリコン膜、窒化酸化シリコン膜、窒化シリコン膜、酸化アルミニウム膜、酸化ハフニウム膜、酸化イットリウム膜、酸化ジルコニウム膜、酸化ガリウム膜、酸化タンタル膜、酸化マグネシウム膜、酸化ランタン膜、酸化セリウム膜、および酸化ネオジム膜等が挙げられる。
トランジスタのゲート、ソース、ドレインのほか、表示装置が有する各種配線および電極等の導電層には、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を単層構造または積層構造として用いることができる。例えば、アルミニウム膜上にチタン膜を積層する二層構造、タングステン膜上にチタン膜を積層する二層構造、モリブデン膜上に銅膜を積層した二層構造、モリブデンとタングステンを含む合金膜上に銅膜を積層した二層構造、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、チタン膜または窒化チタン膜と、そのチタン膜または窒化チタン膜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、そのモリブデン膜または窒化モリブデン膜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。例えば、導電層を三層構造とする場合、一層目および三層目には、チタン、窒化チタン、モリブデン、タングステン、モリブデンとタングステンを含む合金、モリブデンとジルコニウムを含む合金、または窒化モリブデンでなる膜を形成し、二層目には、銅、アルミニウム、金または銀、或いは銅とマンガンの合金等の低抵抗材料でなる膜を形成することが好ましい。なお、ITO、酸化タングステンを含むインジウム酸化物、酸化タングステンを含むインジウム亜鉛酸化物、酸化チタンを含むインジウム酸化物、酸化チタンを含むインジウム錫酸化物、インジウム亜鉛酸化物、ITSO等の透光性を有する導電性材料を用いてもよい。
接着層141としては、熱硬化樹脂、光硬化樹脂、または2液混合型の硬化性樹脂等の硬化性樹脂を用いることができる。例えば、アクリル樹脂、ウレタン樹脂、エポキシ樹脂、またはシロキサン樹脂等を用いることができる。
接続体242としては、例えば、異方性導電フィルム(ACF:Anisotropic Conductive Film)、または異方性導電ペースト(ACP:Anisotropic Conductive Paste)等を用いることができる。
着色層131は特定の波長帯域の光を透過する有色層である。着色層131に用いることのできる材料としては、金属材料、樹脂材料、および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132は、例えば、隣接する異なる色の着色層131の間に設けられる。例えば、金属材料、または、顔料もしくは染料を含む樹脂材料を用いて形成されたブラックマトリクスを遮光層132として用いることができる。なお、遮光層132は、駆動回路部64等、画素900以外の領域にも設けると、導波光等による光漏れを抑制できるため好ましい。
図6に示す構成の表示装置100の作製方法の一例について、図8(A)、(B)、(C)および図9(A)、(B)を用いて説明する。なお、本作製方法例において、作製するトランジスタおよび液晶素子等の構成を変えることで、本実施の形態の他の表示装置等も作製することができる。
図10(A)、(B)に画素900、および画素900が有する副画素の配置例を示す。図10(A)、(B)では、赤色の副画素R、緑色の副画素G、および青色の副画素Bによって1つの画素が構成される例を示す。図10(A)、(B)では、複数の走査線81がx方向に伸長しており、複数の信号線82がy方向に伸長しており、走査線81と信号線82は交差している。
本発明の一態様は、タッチセンサが搭載された表示装置(入出力装置またはタッチパネルともいう)に適用することができる。上述の各表示装置の構成を、タッチパネルに適用することができる。本実施の形態では、表示装置100にタッチセンサを搭載する例を主に説明する。
本実施の形態では、本発明の一態様の表示装置で行うことができる動作モードについて図13を用いて説明する。
本実施の形態では、タッチセンサの駆動方法の例について、図面を参照して説明する。
図14(A)は、相互容量方式のタッチセンサの構成を示すブロック図である。図14(A)では、パルス電圧出力回路551、電流検出回路552を示している。なお図14(A)では、パルス電圧が与えられる電極521、電流の変化を検知する電極522をそれぞれ、X1乃至X6、Y1乃至Y6のそれぞれ6本の配線として示している。また図14(A)は、電極521および電極522が重畳することで形成される容量553を図示している。なお、電極521と電極522とはその機能を互いに置き換えてもよい。
図15(A)は、表示装置の構成例を示すブロック図である。図15(A)ではゲート駆動回路GD(走査線駆動回路)、ソース駆動回路SD(信号線駆動回路)、複数の画素pixを有する表示部を示している。なお図15(A)では、ゲート駆動回路GDに電気的に接続されるゲート線x_1乃至x_m(mは自然数)、ソース駆動回路SDに電気的に接続されるソース線y_1乃至y_n(nは自然数)に対応して、画素pixではそれぞれに(1,1)乃至(n,m)の符号を付している。
図16(A)乃至(D)は、一例として図14(A)、(B)で説明したタッチセンサと、図15(A)、(B)で説明した表示部を1sec.(1秒間)駆動する場合に、連続するフレーム期間の動作について説明する図である。なお図16(A)では、表示部の1フレーム期間を16.7ms(フレーム周波数:60Hz)、タッチセンサの1フレーム期間を16.7ms(フレーム周波数:60Hz)とした場合について示している。
本実施の形態では、本発明の一態様で開示されるトランジスタの半導体層に用いることができる金属酸化物について説明する。なお、トランジスタの半導体層に金属酸化物を用いる場合、当該金属酸化物を酸化物半導体と読み替えてもよい。
本実施の形態では、本発明の一態様の電子機器について説明する。
10A 表示装置
10B 表示装置
11 基板
12 基板
13 バックライトユニット
14 トランジスタ
15 液晶素子
15A 表示装置
15B 表示装置
15C 表示装置
16 容量素子
21 画素電極
22 液晶層
23 共通電極
25 導電層
26 絶縁層
27 導電層
28 導電層
29 接続体
31 タッチセンサユニット
32 絶縁層
33 導電層
34 容量素子
40 液晶素子
45a 光
45b 光
45c 光
51 基板
61 基板
62 表示部
64 駆動回路部
65 配線
72 FPC
72a FPC
72b FPC
73 IC
73a IC
73b IC
81 走査線
82 信号線
100 表示装置
111 画素電極
112 共通電極
113 液晶層
121 オーバーコート
124 電極
125 絶縁層
126 導電層
127 電極
128 電極
130 偏光板
131 着色層
132 遮光層
133a 配向膜
133b 配向膜
137 配線
138 配線
141 接着層
160 保護基板
161 バックライト
162 基板
163 接着層
164 接着層
165 偏光板
166 偏光板
167 接着層
168 接着層
169 接着層
201 トランジスタ
204 接続部
206 トランジスタ
211 絶縁層
212 絶縁層
214 絶縁層
215 絶縁層
221 ゲート電極
222 導電層
223 ゲート電極
224 導電層
225 導電層
231 半導体層
232 導電層
232a 半導体層
242 接続体
242b 接続体
251 導電層
261 絶縁層
262 導電層
262a 半導体層
350 タッチパネル
370 表示装置
375 入力装置
501 表示素子
506 画素回路
521 電極
522 電極
551 パルス電圧出力回路
552 電流検出回路
553 容量
900 画素
900s 遮光領域
900t 透過領域
902 配線
904 配線
918 表示領域
918B 表示領域
918G 表示領域
918R 表示領域
7900 自動車
7901 車体
7902 車輪
7903 フロントガラス
7904 ライト
7905 フォグランプ
7910 表示部
7911 表示部
7912 表示部
7913 表示部
7914 表示部
7915 表示部
7916 表示部
7917 表示部
8000 筐体
8001 表示部
8003 スピーカ
8111 筐体
8112 表示部
8113 キーボード
8114 ポインティングデバイス
Claims (19)
- トランジスタと、容量素子と、を有する表示装置であって、
前記トランジスタは、
第1の絶縁層と、
前記第1の絶縁層と接する第1の半導体層と、
前記第1の半導体層と接する第2の絶縁層と、
前記第2の絶縁層に設けられた開口部を介して、前記第1の半導体層と電気的に接続される第1の導電層と、を有し、
前記第1の半導体層は、チャネル領域を有し、
前記容量素子は、
前記第1の絶縁層と接する第2の導電層と、
前記第2の導電層と接する前記第2の絶縁層と、
前記第2の絶縁層と接する前記第1の導電層と、を有し、
前記第2の導電層は、前記第1の半導体層と同様の組成を有し、
前記第1の導電層、および前記第2の導電層は、可視光を透過する機能を有することを特徴とする表示装置。 - 請求項1において、
前記第1の半導体層、前記第1の導電層、および前記第2の導電層は、金属酸化物を有することを特徴とする表示装置。 - 請求項2において、
前記第1の半導体層が有する前記金属酸化物は、前記第1の導電層が有する前記金属酸化物に含まれる金属元素を1種類以上有することを特徴とする表示装置。 - 請求項2または3において、
前記第1の導電層は、In−Zn酸化物を有することを特徴とする表示装置。 - 請求項1乃至4のいずれか一項において、
前記第2の絶縁層は、酸化窒化シリコンを有することを特徴とする表示装置。 - 請求項1乃至5のいずれか一項において、
前記第2の絶縁層および前記第1の導電層と接する第3の絶縁層を有し、
前記第3の絶縁層は、化学量論的組成を満たす酸素よりも多くの酸素を有することを特徴とする表示装置。 - 請求項1乃至6のいずれか一項において、
液晶素子を有し、
前記液晶素子は、液晶層と、画素電極と、を有し、
前記画素電極は、前記第1の導電層と電気的に接続されていることを特徴とする表示装置。 - 請求項7において、
前記液晶素子の抵抗率は、1.0×1014Ω・cm以上であることを特徴とする表示装置。 - 請求項1乃至8のいずれか一項において、
前記表示装置のフレーム周波数は、0.1Hz以上60Hz未満であり、
前記表示装置は、前記容量素子にデータを書き込んだ後、前記トランジスタを非導通状態とすることにより前記データを保持する機能を有することを特徴とする表示装置。 - 請求項9において、
前記表示装置のフレーム周波数は、0.1Hz以上20Hz未満であることを特徴とする表示装置。 - 請求項1乃至10のいずれか一項において、
走査線を有し、
前記走査線は、金属材料を用いて形成され、
前記走査線は、前記トランジスタのチャネル領域と重なる部分を有することを特徴とする表示装置。 - 請求項1乃至11のいずれか一項に記載の表示装置と、
操作キーと、
を有することを特徴とする電子機器。 - 表示装置の作製方法であって、
前記作製方法は、
第1の半導体層および第2の半導体層を形成する工程と、
前記第1の半導体層および前記第2の半導体層と接するように、第1の絶縁層を形成する工程と、
前記第1の絶縁層に、前記第1の半導体層に達する第1の開口部を形成する工程と、
前記第2の半導体層と重なり、前記第1の開口部を介して前記第1の半導体層と電気的に接続されるように、第3の半導体層を形成する工程と、
前記第1の絶縁層および前記第3の半導体層と接するように、第2の絶縁層を形成する工程と、
前記第2の絶縁層に、前記第3の半導体層に達する第2の開口部を形成する工程と、
前記第2の開口部を介して前記第3の半導体層と電気的に接続されるように、画素電極を形成する工程と、を有し、
前記第1の絶縁層を形成する工程において、前記第1の半導体層、および第2の半導体層は、それぞれ低抵抗化され、
前記第2の絶縁層を形成する工程において、前記第3の半導体層は、低抵抗化され、
前記第2の絶縁層の形成後、低抵抗化された前記第1の半導体層のチャネル領域は、高抵抗化されることを特徴とする表示装置の作製方法。 - 請求項13において、
金属酸化物を有するように、前記第1の半導体層、前記第2の半導体層、および前記第3の半導体層を形成することを特徴とする表示装置の作製方法。 - 請求項14において、
In−Zn酸化物を有するように、前記第3の半導体層を形成することを特徴とする表示装置の作製方法。 - 請求項13乃至15のいずれか一項において、
シランを含む成膜ガスを用いて、CVD法により、前記第1の絶縁層および前記第2の絶縁層を形成することを特徴とする表示装置の作製方法。 - 請求項16において、
前記成膜ガスは、窒素酸化物を含むことを特徴とする表示装置の作製方法。 - 請求項13乃至17のいずれか一項において、
前記第2の絶縁層の形成後に、熱処理を行うことを特徴とする表示装置の作製方法。 - 請求項13乃至18のいずれか一項において、
前記画素電極の形成後、液晶層を形成することを特徴とする表示装置の作製方法。
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US20210020666A1 (en) | 2021-01-21 |
US20180145095A1 (en) | 2018-05-24 |
US11532650B2 (en) | 2022-12-20 |
JP2024012368A (ja) | 2024-01-30 |
JP2023051970A (ja) | 2023-04-11 |
JP7375153B2 (ja) | 2023-11-07 |
US10790318B2 (en) | 2020-09-29 |
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