JP2007304319A - Display apparatus - Google Patents

Display apparatus Download PDF

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JP2007304319A
JP2007304319A JP2006132303A JP2006132303A JP2007304319A JP 2007304319 A JP2007304319 A JP 2007304319A JP 2006132303 A JP2006132303 A JP 2006132303A JP 2006132303 A JP2006132303 A JP 2006132303A JP 2007304319 A JP2007304319 A JP 2007304319A
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drain
circuit board
printed circuit
gate
delay time
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JP2007304319A5 (en
JP5090663B2 (en
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Kikuo Ono
記久雄 小野
Ikuko Mori
育子 盛
Yuichi Takenaka
雄一 竹中
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Japan Display Inc
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Hitachi Displays Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that when a drain side printed circuit board is reduced, delay arise and a gradient of brightness occurs in the horizontal direction. <P>SOLUTION: A reduced drain side printed circuit board PCB 1 is disposed on the left side of a glass substrate SUB. In this case, a delay time Td2 of a drain voltage Vd to a gate voltage Vg is made longer than a variable delay time Td0. Alternatively the delay time Td2 can be set to a constant delay time tgl. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、表示パネルを駆動する印刷回路基板を縮小した表示装置に関する。   The present invention relates to a display device in which a printed circuit board for driving a display panel is reduced.

従来の表示装置について、図3を用いて説明する。図3は、従来の表示装置の平面図とその駆動方法の説明図であって、図3(a)は表示装置の平面図、図3(b)から図3(e)はその駆動方法の説明図である。   A conventional display device will be described with reference to FIG. FIG. 3 is a plan view of a conventional display device and an explanatory diagram of a driving method thereof. FIG. 3A is a plan view of the display device, and FIGS. 3B to 3E are driving methods thereof. It is explanatory drawing.

図3(a)において、表示領域PXには、液晶素子又は有機EL素子などの画素がマトリクス状に配置されている。また、この画素を駆動するために、複数のゲート配線と複数のドレイン配線が交差して形成され、その交差部に画素を選択する薄膜トランジスタ(TFT)が配置されている。   In FIG. 3A, pixels such as liquid crystal elements or organic EL elements are arranged in a matrix in the display region PX. In order to drive this pixel, a plurality of gate wirings and a plurality of drain wirings are formed so as to intersect with each other, and a thin film transistor (TFT) for selecting the pixel is disposed at the intersection.

表示領域PXにおける複数のゲート配線は、透明絶縁基板(ガラス基板)SUB上に、ゲート配線GLとして引き出される。同じく、複数のドレイン配線は、ガラス基板SUB上に、ドレイン配線DLとして引き出される。   The plurality of gate lines in the display area PX are drawn out as gate lines GL on the transparent insulating substrate (glass substrate) SUB. Similarly, the plurality of drain wirings are drawn out as drain wirings DL on the glass substrate SUB.

このドレイン配線DLを駆動するドレイン側印刷回路基板PCB1とゲート配線GLを駆動するゲート側印刷回路基板PCB2は、直交するようにガラス基板SUBの外に設けられている。そのため、このドレイン側印刷回路基板PCB1は、チップ集積回路IC1が搭載されたドレイン側テープ・キャリア・パッケージTCP1を介して、ドレイン配線DLと接続され、また、ゲート側印刷回路基板PCB2は、チップ集積回路IC2が搭載されたゲート側テープ・キャリア・パッケージTCP2を介して、ゲート配線GLと接続される。ここで、テープ・キャリア・パッケージTCP(Tape Carrier Package)は、チップ・オン・フィルムCOF(Chip On Film)と称される場合もある。   The drain side printed circuit board PCB1 for driving the drain wiring DL and the gate side printed circuit board PCB2 for driving the gate wiring GL are provided outside the glass substrate SUB so as to be orthogonal to each other. Therefore, the drain side printed circuit board PCB1 is connected to the drain wiring DL through the drain side tape carrier package TCP1 on which the chip integrated circuit IC1 is mounted, and the gate side printed circuit board PCB2 is chip integrated. The gate wiring GL is connected to the gate side tape carrier package TCP2 on which the circuit IC2 is mounted. Here, the tape carrier package TCP (Tape Carrier Package) may be referred to as a chip on film COF (Chip On Film).

次に、図3(b)から図3(e)を用いて、駆動方法の説明をする。図3(b)は、図3(a)に示すX=0での駆動波形であって、Vgはゲート電圧、Vdはドレイン電圧、Vpxは画素への書込電圧、Vcは中心電圧、tgはゲート選択時間、tglはドレイン遅延時間である。   Next, the driving method will be described with reference to FIGS. 3B to 3E. FIG. 3B is a driving waveform at X = 0 shown in FIG. 3A, where Vg is a gate voltage, Vd is a drain voltage, Vpx is a pixel writing voltage, Vc is a center voltage, tg Is a gate selection time, and tgl is a drain delay time.

図3(b)において、X=0では、ドレイン電圧Vdがゲート電圧Vgに対してtgl分遅延しているので、画素への書込時間はtg−tglとなる。このドレイン遅延時間tglは、X=Maxでのゲート電圧Vgの立下がりの遅延の影響によって、ドレイン電圧Vdの切換時でのクロストークを防止するために設けられる。   In FIG. 3B, when X = 0, the drain voltage Vd is delayed by tgl with respect to the gate voltage Vg, so the pixel writing time is tg−tgl. This drain delay time tgl is provided to prevent crosstalk at the time of switching the drain voltage Vd due to the delay effect of the fall of the gate voltage Vg at X = Max.

このように、X=0での画素への書込時間はtg−tglとなるが、X=Maxでの画素への書込時間は、図3(c)に示すように、ゲート電圧Vgの立下がりによる遅延の分たけ、追加された書込時間tadが生じ、tg−tgl+tadとなる。このため、X=Maxでは輝度が高く、X=0では輝度が低い状態となり、輝度の傾斜が発生する。   Thus, the write time to the pixel at X = 0 is tg-tgl, but the write time to the pixel at X = Max is the gate voltage Vg as shown in FIG. Due to the delay due to the falling edge, an additional write time tad is generated, which is tg−tgl + tad. For this reason, when X = Max, the luminance is high, and when X = 0, the luminance is low, and a luminance gradient occurs.

そこで、輝度の均一化を図るために、図3(d)に示すように、X=0でのゲート電圧Vgに対してのドレイン電圧Vdの遅延時間をtgl−tadとし、図3(e)に示すように、X=Maxではtglとなるように、X方向のドレイン遅延時間を一定の遅延時間tglから可変遅延時間Td0としている。   Therefore, in order to make the luminance uniform, as shown in FIG. 3D, the delay time of the drain voltage Vd with respect to the gate voltage Vg at X = 0 is tgl-tad, and FIG. As shown, the drain delay time in the X direction is changed from a constant delay time tgl to a variable delay time Td0 so that tgl is obtained when X = Max.

なお、下記特許文献1には、液晶表示パネルを駆動する駆動側印刷回路基板を液晶表示パネルの一辺に配置した液晶表示装置が記載されている。
特開平8−234237号公報
Patent Document 1 below describes a liquid crystal display device in which a driving printed circuit board for driving a liquid crystal display panel is arranged on one side of the liquid crystal display panel.
JP-A-8-234237

従来の表示装置におけるドレイン側印刷回路基板PCB1は、均等に配置されたテープ・キャリア・パッケージTCP1より長いサイズに設定されていた。そこで、ガラス基板SUB上に引き出されるドレイン配線DLの長さを変えて、ドレイン側テープ・キャリア・パッケージTCP1の間隔をつめると、ドレイン側印刷回路基板PCB1の長さを小さくできる。しかし、ドレイン配線DLの長さが画面の横方向で異なるために、ドレイン配線DLの遅延が異なって、横方向に輝度の傾斜が発生する。   The drain side printed circuit board PCB1 in the conventional display device is set to a size longer than the evenly arranged tape carrier package TCP1. Therefore, the length of the drain-side printed circuit board PCB1 can be reduced by changing the length of the drain wiring DL drawn on the glass substrate SUB to close the gap between the drain-side tape carrier package TCP1. However, since the length of the drain wiring DL is different in the horizontal direction of the screen, the delay of the drain wiring DL is different, and a luminance gradient occurs in the horizontal direction.

本発明は、ドレイン側印刷回路基板PCB1を、ガラス基板SUBの中央から右側又は左側に配置することを特徴とする。また、右側に配置した場合には、ゲート電圧Vgに対するドレイン電圧Vdの遅延時間を、可変遅延時間Td0より短くし、左側に配置した場合には長くする。   The present invention is characterized in that the drain side printed circuit board PCB1 is arranged on the right side or the left side from the center of the glass substrate SUB. Further, when arranged on the right side, the delay time of the drain voltage Vd with respect to the gate voltage Vg is made shorter than the variable delay time Td0, and when arranged on the left side, it is made longer.

本発明では、縮小されたドレイン側印刷回路基板PCB1において、画面上の輝度傾斜を少なくすることができる。特に、縮小されたドレイン側印刷回路基板PCB1をガラス基板SUBの左側に配置した場合には、ドレイン電圧Vdの遅延時間を長くすることなく、可変遅延時間Td0のままであっても画面上の輝度傾斜を改善することができる。   In the present invention, the luminance gradient on the screen can be reduced in the reduced drain side printed circuit board PCB1. In particular, when the reduced drain side printed circuit board PCB1 is arranged on the left side of the glass substrate SUB, the luminance on the screen is maintained even if the variable delay time Td0 is maintained without increasing the delay time of the drain voltage Vd. The inclination can be improved.

また、縮小されたドレイン側印刷回路基板PCB1をガラス基板SUBの左側に配置した場合には、ガラス基板SUBの右側に余裕が生じ、この余裕部分をロボットハンドに持たせることによって、製造工程中でガラス基板SUBを運搬する際の取り扱いが容易になる。   In addition, when the reduced drain side printed circuit board PCB1 is arranged on the left side of the glass substrate SUB, there is a margin on the right side of the glass substrate SUB, and this margin portion is held in the robot hand so that the manufacturing process can be performed. Handling when transporting the glass substrate SUB is facilitated.

以下、図面を用いて、本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図1は、本実施例の表示装置の平面図とその駆動方法の説明図であって、図3に示す従来の表示装置と異なるのは、図3(a)におけるドレイン側印刷回路基板PCB1を、図1(a)に示すように、縮小して、透明絶縁基板(ガラス基板)SUBの右側に配置した点である。また、図1(d)(e)において、ゲート電圧Vgに対するドレイン電圧Vdの遅延時間を、図3(e)に示す可変遅延時間Td0より短くした可変遅延時間Td1とする点である。その他の構成は、図3と同じで、図3については、既に説明したので、ここでは図3と異なる点についてのみ説明する。   FIG. 1 is a plan view of the display device of this embodiment and an explanatory diagram of its driving method. The difference from the conventional display device shown in FIG. 3 is that the drain side printed circuit board PCB1 in FIG. As shown in FIG. 1A, it is reduced in size and arranged on the right side of the transparent insulating substrate (glass substrate) SUB. Further, in FIGS. 1D and 1E, the delay time of the drain voltage Vd with respect to the gate voltage Vg is set to a variable delay time Td1 that is shorter than the variable delay time Td0 shown in FIG. Other configurations are the same as those in FIG. 3, and since FIG. 3 has already been described, only differences from FIG. 3 will be described here.

図1(a)において、ガラス基板SUBの中央に配置されていたドレイン側印刷回路基板PCB1を縮小して、ゲート側印刷回路基板PCB2から遠いゲート配線の遠端側であるガラス基板SUBの右側に配置する。   In FIG. 1 (a), the drain side printed circuit board PCB1 arranged at the center of the glass substrate SUB is reduced to the right side of the glass substrate SUB which is the far end side of the gate wiring far from the gate side printed circuit board PCB2. Deploy.

このように、縮小したドレイン側印刷回路基板PCB1をガラス基板SUBの右側に配置することによって、ガラス基板SUB上に引き出された左側のドレイン配線DLが長くなり、ドレイン電圧Vdに遅延が生じる。   Thus, by arranging the reduced drain side printed circuit board PCB1 on the right side of the glass substrate SUB, the left drain wiring DL drawn on the glass substrate SUB becomes longer, and the drain voltage Vd is delayed.

図1(b)は、X=0での駆動波形で、ドレイン電圧Vdが遅延することによって、画素への書込電圧Vpxが遅延し、その結果、画面左側の輝度が低くなり、画面上において輝度傾斜が生ずる。   FIG. 1B shows a drive waveform at X = 0, and the drain voltage Vd is delayed by delaying the drain voltage Vd. As a result, the luminance on the left side of the screen is lowered, and the screen has a lower luminance. Luminance gradient occurs.

この輝度傾斜を防止するために、図1(d)(e)に示すように、ゲート電圧Vgに対するドレイン電圧Vdの遅延時間Td1を可変遅延時間Td0より短くする。すなわち、ドレイン配線DLが長くなることによるドレイン電圧Vdの遅延分を見込んで、可変遅延時間Td0より短くすることで、画面左側の輝度が高くなり、画面上の輝度傾斜が改善される。   In order to prevent this luminance gradient, as shown in FIGS. 1D and 1E, the delay time Td1 of the drain voltage Vd with respect to the gate voltage Vg is made shorter than the variable delay time Td0. That is, in consideration of the delay of the drain voltage Vd due to the length of the drain wiring DL being shorter than the variable delay time Td0, the luminance on the left side of the screen is increased, and the luminance gradient on the screen is improved.

図2は、本実施例の表示装置の平面図とその駆動方法の説明図であって、図1の実施例1と異なるのは、図1(a)におけるドレイン側印刷回路基板PCB1を、図2(a)に示すように、ガラス基板SUBの左側に配置した点である。また、図2(d)(e)において、ゲート電圧Vgに対するドレイン電圧Vdの遅延時間を、可変遅延時間Td0より長くした可変遅延時間Td2とする点である。その他の構成は、図1と同じで、図1については、既に説明したので、ここでは図1と異なる点についてのみ説明する。   FIG. 2 is a plan view of the display device of this embodiment and an explanatory diagram of its driving method. The difference from Embodiment 1 of FIG. 1 is that the drain side printed circuit board PCB1 in FIG. As shown to 2 (a), it is the point arrange | positioned on the left side of the glass substrate SUB. 2D and 2E, the delay time of the drain voltage Vd with respect to the gate voltage Vg is a variable delay time Td2 that is longer than the variable delay time Td0. Other configurations are the same as those in FIG. 1, and since FIG. 1 has already been described, only differences from FIG. 1 will be described here.

図2(a)において、ガラス基板SUBの中央に配置されていたドレイン側印刷回路基板PCB1を縮小して、ゲート側印刷回路基板PCB2に近いゲート配線の近端側であるガラス基板SUBの左側に配置する。   In FIG. 2 (a), the drain side printed circuit board PCB1 arranged at the center of the glass substrate SUB is reduced to the left side of the glass substrate SUB which is the near end side of the gate wiring near the gate side printed circuit board PCB2. Deploy.

このように、縮小したドレイン側印刷回路基板PCB1をガラス基板SUBの左側に配置することによって、ガラス基板SUB上に引き出された右側のドレイン配線DLが長くなり、ドレイン電圧Vdに遅延が生じる。   Thus, by arranging the reduced drain side printed circuit board PCB1 on the left side of the glass substrate SUB, the right drain wiring DL drawn on the glass substrate SUB becomes longer, and the drain voltage Vd is delayed.

図2(c)は、X=Maxでの駆動波形で、ドレイン電圧Vdが遅延することによって、画素への書込電圧Vpxが遅延し、その結果、画面右側の輝度が低くなり、画面上において輝度傾斜が生ずる。   FIG. 2C shows a driving waveform at X = Max, and the drain voltage Vd is delayed, so that the write voltage Vpx to the pixel is delayed. As a result, the luminance on the right side of the screen is lowered, and on the screen. Luminance gradient occurs.

この輝度傾斜を防止するために、図2(d)(e)に示すように、ゲート電圧Vgに対するドレイン電圧Vdの遅延時間Td2を可変遅延時間Td0より長くする。すなわち、ドレイン配線DLが長くなることによるドレイン電圧Vdの遅延分を見込んで、可変遅延時間Td0より長くすることで、画面左側の輝度が低くなり、画面上の輝度傾斜が改善される。   In order to prevent this luminance gradient, as shown in FIGS. 2D and 2E, the delay time Td2 of the drain voltage Vd with respect to the gate voltage Vg is set longer than the variable delay time Td0. That is, in consideration of the delay of the drain voltage Vd due to the length of the drain wiring DL being longer than the variable delay time Td0, the luminance on the left side of the screen is lowered and the luminance gradient on the screen is improved.

なお、図2(c)に示すX=Maxでの駆動波形によって、画面右側の輝度が低くなるが、これは、図2(b)に示すX=0でのドレイン遅延時間をtgl−tadとしたためで、このドレイン遅延時間をtglとすると、画面右側の輝度の低下を防止できる。   Note that the luminance on the right side of the screen is lowered by the drive waveform at X = Max shown in FIG. 2C. This is because the drain delay time at X = 0 shown in FIG. 2B is expressed as tgl-tad. Therefore, if this drain delay time is tgl, it is possible to prevent a decrease in luminance on the right side of the screen.

すなわち、図3(b)(c)で説明したように、ドレイン遅延時間を一定の遅延時間tglとすると、画面右側の輝度が追加遅延時間tadの影響で高くなるが、図2(c)に示すように、ドレイン電圧Vdが遅延することによって、追加遅延時間tadの影響を緩和できるためである。   That is, as described with reference to FIGS. 3B and 3C, when the drain delay time is set to a constant delay time tgl, the luminance on the right side of the screen increases due to the influence of the additional delay time tad. This is because the influence of the additional delay time tad can be reduced by delaying the drain voltage Vd.

以上、実施例1,2においては、ドレイン側印刷回路基板PCB1をガラス基板SUBの右側又は左側に配置したが、同様にして、ゲート側印刷回路基板PCB2をガラス基板SUBの上側又は下側に配置してもよい。   As described above, in the first and second embodiments, the drain side printed circuit board PCB1 is arranged on the right side or the left side of the glass substrate SUB. Similarly, the gate side printed circuit board PCB2 is arranged on the upper side or the lower side of the glass substrate SUB. May be.

本発明に係る表示装置(実施例1)の平面図とその駆動方法の説明図。The top view of the display apparatus (Example 1) which concerns on this invention, and explanatory drawing of the drive method. 本発明に係る表示装置(実施例2)の平面図とその駆動方法の説明図。The top view of the display apparatus (Example 2) which concerns on this invention, and explanatory drawing of the drive method. 従来の表示装置の平面図とその駆動方法の説明図。The top view of the conventional display apparatus and explanatory drawing of the drive method.

符号の説明Explanation of symbols

PX…表示領域、SUB…透明絶縁基板(ガラス基板)、GL…ゲート配線、DL…ドレイン配線、PCB1…ドレイン側印刷回路基板、IC1,IC2…チップ集積回路、TCP1…ドレイン側テープ・キャリア・パッケージ、PCB2…ゲート側印刷回路基板、TCP2…ゲート側テープ・キャリア・パッケージ。
PX ... Display region, SUB ... Transparent insulating substrate (glass substrate), GL ... Gate wiring, DL ... Drain wiring, PCB1 ... Drain side printed circuit board, IC1, IC2 ... Chip integrated circuit, TCP1 ... Drain side tape carrier package PCB2 ... gate side printed circuit board, TCP2 ... gate side tape carrier package.

Claims (5)

複数のゲート配線と前記ゲート配線と交差する複数のドレイン配線と前記ゲート配線とドレイン配線との交差部に配置された画素とが形成された透明絶縁基板と、前記ゲート配線を駆動するゲート側印刷回路基板と、前記ドレイン配線を駆動するドレイン側印刷回路基板を備えた表示装置において、
前記ゲート側印刷回路基板と前記ドレイン側印刷回路基板は直交するように配置され、前記ドレイン側印刷回路基板を縮小して前記ゲート側印刷回路基板から遠いゲート配線の遠端側に配置したことを特徴とする表示装置。
A transparent insulating substrate on which a plurality of gate wirings, a plurality of drain wirings intersecting the gate wirings, and a pixel disposed at an intersection of the gate wirings and the drain wirings are formed, and gate-side printing for driving the gate wirings In a display device comprising a circuit board and a drain side printed circuit board for driving the drain wiring,
The gate side printed circuit board and the drain side printed circuit board are arranged to be orthogonal to each other, and the drain side printed circuit board is reduced and arranged on the far end side of the gate wiring far from the gate side printed circuit board. Characteristic display device.
前記ドレイン側印刷回路基板からのドレイン電圧の遅延時間を可変遅延時間より短くすることを特徴とする請求項1に記載の表示装置。   The display device according to claim 1, wherein a delay time of a drain voltage from the drain side printed circuit board is shorter than a variable delay time. 複数のゲート配線と前記ゲート配線と交差する複数のドレイン配線と前記ゲート配線とドレイン配線との交差部に配置された画素とが形成された透明絶縁基板と、前記ゲート配線を駆動するゲート側印刷回路基板と、前記ドレイン配線を駆動するドレイン側印刷回路基板を備えた表示装置において、
前記ゲート側印刷回路基板と前記ドレイン側印刷回路基板は直交するように配置され、前記ドレイン側印刷回路基板を縮小して前記ゲート側印刷回路基板に近いゲート配線の近端側に配置したことを特徴とする表示装置。
A transparent insulating substrate on which a plurality of gate wirings, a plurality of drain wirings intersecting the gate wirings, and a pixel disposed at an intersection of the gate wirings and the drain wirings are formed, and gate-side printing for driving the gate wirings In a display device comprising a circuit board and a drain side printed circuit board for driving the drain wiring,
The gate side printed circuit board and the drain side printed circuit board are arranged so as to be orthogonal to each other, and the drain side printed circuit board is reduced and arranged on the near end side of the gate wiring close to the gate side printed circuit board. Characteristic display device.
前記ドレイン側印刷回路基板からのドレイン電圧の遅延時間を可変遅延時間より長くすることを特徴とする請求項3に記載の表示装置。   The display device according to claim 3, wherein a delay time of the drain voltage from the drain side printed circuit board is made longer than a variable delay time. 前記ドレイン側印刷回路基板からのドレイン電圧の遅延時間を一定とすることを特徴とする請求項3に記載の表示装置。
4. The display device according to claim 3, wherein a delay time of drain voltage from the drain side printed circuit board is constant.
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