JPH063477B2 - Liquid crystal display element inspection method - Google Patents

Description

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which cells are arranged in a matrix, in which electrode disconnection and short circuit between adjacent electrodes are efficiently performed. The present invention relates to a method of inspecting a liquid crystal display element for detection.

[Conventional technology]

FIG. 8 is a schematic view showing a conventional liquid crystal display device inspection method.

The conventional method for inspecting a liquid crystal display device is as shown in FIG. 8 in which electrodes X ₁ and electrodes formed on the surface of the first substrate through the liquid crystal are used.
X _2, electrodes X _3, · · ·, electrodes Y ₁ of the other pole of the conducting device 2 connected to one pole to short circuit plate 1 shorted electrode X _m second substrate, electrodes Y _2, electrodes Y _3, .... Applying a pulse voltage in which the polarities are reversed by sequentially contacting the electrodes Y _{n one by one} , and the electrodes X ₁ , X ₂ ,
Electrode X _3, · · ·, electrodes Y ₁ which cross each electrode X _m and the electrodes, the electrode Y _2, electrodes Y _3, · · ·, of the total number m × composed of n cells is the intersection of the electrodes Y _n The degree of color change was visually judged to detect disconnection of electrodes and short circuit between electrodes.

[Problems to be solved by the invention]

The above-described conventional liquid crystal surface element inspection method has a problem that a large number of man-hours are required for a liquid crystal surface element having a large number of electrodes on each of the first substrate and the second substrate.

The present invention has been made in order to solve such a problem, and its object is to inspect a liquid crystal surface element for efficiently detecting disconnection of electrodes of the liquid crystal surface element and difficult short circuit between adjacent electrodes. To provide a method.

[Means for solving problems]

The above-mentioned purpose is to provide a plurality of linear electrodes X ₁ , electrodes X ₂ , which are isolated and insulated from each other on the surface of the first substrate as shown in FIG.
Electrode X _3, · · ·, and the electrode X _m, a plurality of electrodes Y ₁ which is isolated and insulated from each other in the second substrate surface, the electrode Y _2, electrodes Y _3, · ·
.. In a method for inspecting a liquid crystal display element in which electrodes Y _n intersect with each other through a liquid crystal, electrodes X ₁ and electrodes on the _first substrate
X ₂ , electrode X ₃ , ..., connect every other electrode X _m to X-1
A terminal is formed and the remaining electrodes are connected to form an X-2 terminal, and electrodes Y ₁ , Y ₂ and Y _{3 of} the second substrate are formed.
..., connecting every other electrode Y _n to form a Y-1 terminal and connecting the remaining electrodes to form a Y-2 terminal, X-1
An effective voltage higher than the threshold voltage of the liquid crystal display element is applied between the terminal or X-2 terminal and the Y-1 terminal or Y-2 terminal, and the electrodes X ₁ and X _{2 of} the _first substrate are Electrode X ₃ , ..., Electrode X
_m , the electrode Y ₁ , the electrode Y ₂ , the electrode Y ₃ , ..., Of the second substrate
This is achieved by a method for inspecting a liquid crystal display element, which is characterized by detecting disconnection of each electrode and short circuit between electrodes adjacent to each other according to the degree of color change of a cell which is an intersection with the electrode Y _n .

[Action]

The method for inspecting a liquid crystal display device according to the present invention is directed to an electrode on a first substrate.
X _1, electrodes X _2, electrodes X _3, ···, electrode X _m and formed by connecting every other X-1 formed by connecting terminal or remaining electrodes X-2 terminal and a second substrate Electrode Y ₁ , Electrode Y ₂ , Electrode Y ₃ , ..., Electrode
Apply an effective voltage greater than the threshold voltage of the liquid crystal display element between the Y-1 terminal connected to every other Y _n or the Y-2 terminal connected to the rest of the electrodes. It is configured to detect the disconnection of electrodes and the short circuit between electrodes depending on the degree of color change of the cell.

For example, the threshold voltage between the X-1 terminal formed by connecting the electrodes X ₁ , X ₃ , ... And the Y-1 terminal formed by connecting the electrodes Y ₁ , Y ₃ ,. When a larger effective voltage V is applied, electrode X ₁ , electrode X ₃ , ... And electrode Y ₁ , electrode Y ₃ ,.
Since the full voltage of the effective voltage V is applied to the cells (selected cells) intersecting with each other, the selected cells change from the transparent state to the non-transparent black dots and greatly change the color (see FIG. 4).

In addition, electrode X ₁ , electrode X ₃ , ... And electrode Y ₂ , electrode Y ₄ , ...
.Cells crossed with and (semi-selected cells) and electrode X ₂ , electrode
A cell (non-selected cell) formed by crossing X ₄ , ... And electrode Y ₂ , electrode Y ₄ , ..., And electrode X ₂ , electrode X ₄ ,.
Since a voltage of 1/3 of the effective voltage V is applied to the cell formed by intersecting Y ₁ , the electrode Y ₃ , ..., The semi-selected cell and the non-selected cell are transparent to semi-transparent. It becomes a gray point and remains a slight color change.

Therefore, when an effective voltage V higher than the threshold voltage is applied between the X-1 terminal and the Y-1 terminal, all the selected cells change from the transparent state to the non-transparent black dots and all the half-selected cells are selected. When the cell and all non-selected cells change from the transparent state to the semi-transparent gray point, it is determined that the electrodes of this liquid crystal display element have no disconnection and no short circuit between the electrodes.

A cell of a liquid crystal display element is in a selected cell, a half-selected cell, or a non-selected cell when a voltage is applied to the two electrodes forming the cell, and a voltage is applied to the two electrodes. The selected cells are selected cells, the cells to which a voltage is applied to only one of the two electrodes are semi-selected cells, and the cells to which no voltage is applied to any of the electrodes are non-selected cells.

〔Example〕

FIG. 1 is an equivalent circuit diagram of a liquid crystal display device for explaining an embodiment of the present invention.

The liquid crystal display element includes a linear X electrode, that is, a first substrate having an electrode X ₁ , an electrode X ₂ , an electrode X ₃ , ..., An electrode X _m, and a linear Y electrode. That is, it is assumed to be composed of a second substrate having an electrode Y ₁ , an electrode Y ₂ , an electrode Y ₃ , ..., An electrode Y _n .

Then, the electrode X ₁ , which is an odd-numbered electrode of the X electrode of the first substrate, the electrode X ₃ , ... Are connected to form an X-1 terminal, and the electrode X ₂ which is an even-numbered electrode of the X electrode. , Electrode X ₄ , ...
· Is connected to form an X-2 terminal, and the Y electrode of the second substrate, which is an odd-numbered electrode Y ₁ , an electrode Y ₃ , ... Is connected to form a Y-1 terminal and a Y electrode. electrodes Y ₂ is an electrode of the even-numbered electrodes Y _4, by connecting ... and Y-2 terminal.

A total of m × n cells of liquid crystal display elements, that is, the electrode X ₁ , the electrode X ₂ , the electrode X ₃ , ..., The electrode X _m of the first substrate and the electrode Y ₁ , the electrode Y _{2 of} the second substrate, electrodes Y _3, ···, the impedance of each cell are the respective intersections of the electrodes Y _n, Z1
-1, Z2-2, Z2-1 ... Z _mn , the electric circuit of the liquid crystal display element is as shown in FIG.

In such a liquid crystal display element, for example, when a voltage V is applied between the X-1 terminal and the Y-1 terminal, all cells of the liquid crystal display element are selected cells, half-selected cells, non-selected cells depending on the application state of the voltage V, respectively. It becomes one of the states of the selected cell.

For example, as shown in FIG. 2, an impedance Z formed by intersecting an electrode X ₁ which is one electrode constituting the X-1 terminal and an electrode Y ₁ which is one electrode constituting the Y-1 terminal. _The cell having the _1-1 (selected cell) is applied with the entire voltage V, but the cell having the impedance Z _1-2 formed by intersecting the electrode X ₁ and the electrode Y ₂ (half) Selected cells) and electrodes
Impedance Z _2-2 formed by crossing X ₂ and electrode Y ₂
And a cell (an unselected cell) having an impedance Z _2-1 formed by intersecting the electrode X ₂ and the electrode Y ₁ (semi-selected cell) are connected in series to each other to form X-1. Terminal and Y-1
Since each cell is connected to the terminal, the above voltage V
1/3 of the voltage will be applied.

The above description is made assuming that all cells have the same impedance and that the line impedance of each electrode is negligibly small as compared with the cell impedance.

The liquid crystal display element inspection method of the present invention utilizes the above-described principle to inspect for disconnection of the electrode and short circuit between adjacent electrodes.

FIG. 3 shows the connection of the electrodes of the liquid crystal display element.
The electrodes and the Y electrodes are alternately arranged for every odd number or even number,
It shows that the liquid crystal display element can be easily inspected by alternately connecting and applying the voltage V to perform the inspection, and after completion of the inspection, cutting by the a line.

FIG. 4 shows the relationship between the effective voltage applied to the electrodes of the liquid crystal display device and the light reflectance of the cell. In the figure, the cell reflectance is 90% (the transparent cell is a gray dot in a semi-transparent state). ), The effective voltage is a threshold voltage V ₁ , and the cell reflectance is 10%.
The effective voltage at which (transparent cells are black dots in the non-transparent state) is the saturation voltage V ₂ .

The voltage V between 3V ₁ and 3V ₂ is applied to the X-1 terminal and the Y-1 terminal.
By applying, the disconnection of each electrode of the liquid crystal display element and the short circuit between the electrodes can be detected by applying the voltage once.

That is, when the voltage V applied to the X-1 terminal and the Y-1 terminal is applied, all of the voltage V is applied to the electrodes of the liquid crystal display element unless there is a disconnection or a short circuit between adjacent electrodes. The selected cell changes from the transparent state to the black dot, and 1 / V of the voltage V
All half-selected cells and all non-selected cells to which the voltage of 3 is applied respectively change from the transparent state to the gray point.

Also, if there is a disconnection in the electrodes of the liquid crystal display element or there is a short circuit between adjacent electrodes, it will become a gray dot in the selected cell or a black dot in the semi-selected cell and the non-selected cell or a transparent state. Something that stays will be scattered.

FIG. 5 shows that the electrodes of the first substrate are electrode X ₁ , electrode X ₂ , and electrode.
X ₃ , electrode X ₄ and second substrate electrode are electrode Y ₁ , electrode Y ₂ , electrode
Y _3, is composed of the electrodes Y _4, X-1 terminals of the liquid crystal display element has no short-circuit between the respective even natural without disconnection electrode (electrode X _1, the electrode X ₃₎ and Y-1 terminal (electrode Y ₁ and electrode Y ₃ ), which show the degree of color change of the respective cells when a voltage V is applied to the selected cells A, C, I and K, which are black dots, and the half-selected cells B and D. , E, G, J L, M, P and non-selected cells F, H, N, Q indicate gray points.

FIG. 6 shows the degree of color change of the cell of the liquid crystal display device in which the electrodes have wire breaks and short-circuits between the adjacent electrodes. For example, the X electrode (for example, the electrode) forming the half-selected cell J is shown. X ₁ ) and the X electrode (for example, electrode X ₂ ) forming the selected cell I are short-circuited, and the X electrode, for example, electrode X ₃ is disconnected between the selected cell K and the half-selected cell G. ,
The cells of A, B, C, I, and K are black points, and the cells of K and P to which no voltage is applied have no color change, and the other cells are gray points.

In FIG. 7, the electrode Y _{2 of the} Y electrode is a semi-selected cell G and a non-selected cell H.
If there is a disconnection between the cell H and the cell H, no voltage is applied to the cell H and no color change occurs.

As described above, the abnormality of the electrodes appears as a change in the color of the cell, so that the liquid crystal display element can be inspected by applying a voltage once.

Incidentally, the inspection method of the liquid crystal display device of the present invention, the electrode X _1, the electrode X _2, electrodes X _3, ···, X-1 to connect only the electrodes of the odd numbered electrodes or even-numbered electrodes X _m A terminal or an X-2 terminal is formed, and at the same time, an electrode Y ₁ , an electrode Y ₂ , an electrode Y ₃ , ...,
Y-1 terminal or Y-2 terminal is formed by connecting only the odd-numbered electrodes or only the plural-numbered electrodes of the electrode Y _n , and the X-1 terminal or the X-2 terminal and the Y-1 terminal or the Y-2 terminal. It is also possible to apply the voltage V between the terminals.

〔The invention's effect〕

As described in detail above, by adopting the liquid crystal display device inspection method of the present invention, it becomes possible to efficiently inspect the liquid crystal display element.

[Brief description of drawings]

FIG. 1 is an equivalent circuit diagram of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is an equivalent circuit diagram of FIG. 1, FIG. 3 is a connection diagram for inspecting the liquid crystal display device, and FIG. FIG. 8 is a diagram for explaining the effective voltage and reflectance of the liquid crystal display device, FIG. 5, FIG. 6, FIG. 7 are schematic diagrams of display cells for explaining the embodiment of the present invention, FIG. FIG. 9 is a plan view for explaining inspection of a conventional liquid crystal display panel.

Claims (1)

[Claims] 1. A plurality of linear electrodes X ₁ , electrodes X ₂ , electrodes X ₃ , ...
And X _m, a liquid crystal display in which a plurality of electrodes Y ₁ spaced apart and insulated from each other in the second substrate surface, the electrode Y _2, electrodes Y _3, · · ·, and the electrode Y _n formed by intersecting each other via the liquid crystal In the method of inspecting an element, every other electrode X ₁ , electrode X ₂ , electrode X ₃ , ..., Electrode X _m of the first substrate are connected to form an X-1 terminal and the remaining electrodes are connected. To form an X-2 terminal and connect every other electrode Y ₁ , electrode Y ₂ , electrode Y ₃ , ..., Electrode Y _n of the second substrate to form a Y-1 terminal. A Y-2 terminal is configured by connecting the remaining electrodes together with the configuration, and the X-1 terminal or the X-2 terminal and the Y-1 terminal or the Y-2.
Large becomes effective voltage than the threshold voltage of the liquid crystal display device is applied between the terminals, the electrode X ₁ of the first substrate, the electrode X _2, electrodes X _3, · · ·, the the electrode X _m a Electrode Y ₁ , electrode on substrate 2
Liquid crystal display characterized by detecting disconnection of each electrode and short circuit between adjacent electrodes according to the degree of color change of the cell which is the intersection of Y ₂ , electrode Y ₃ , ..., Y _n Device inspection method.