JPH0320865Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid crystal display device used, for example, in a viewfinder of a television camera.

Background Art and Problems Displaying television images using liquid crystals has been proposed.

In FIG _. 1, reference numeral 1 denotes an input terminal to which a television video signal is supplied, and the signals from this input terminal ₁ are vertically (Y
It is supplied to lines L ₁ , L ₂ ...Lm in the axial direction. Note that m is a number corresponding to the number of pixels in the horizontal (X-axis) direction. Further, an m-stage shift register 2 is provided, and clock signals φ _1H and φ 2H with m times the horizontal frequency are supplied to this shift register 2, and clock signals φ _1H and φ _2H from each output terminal of this shift register 2 are supplied.
Drive pulse signal φ _H1 sequentially scanned by φ _2H ,
φ _H2 ...φ _Hn are supplied to each control terminal of the switching elements M ₁ to Mm. Note that the shift register 2 is supplied with a low potential (V _SS ) and a high potential (V _DD ), and drive pulses of these two potentials are formed.

Furthermore, switching elements M ₁₁ and M ₂₁ each consisting of, for example, an N-channel FET are installed in each line L ₁ to Lm.
...M _o1 , M ₁₂ , M ₂₂ ... M _o2 ... M _1n , M _2n ... M _on are connected at one end. Note that n is a number corresponding to the number of horizontal scanning lines. The other ends of the switching elements M ₁₁ to _{M on} are connected to the target terminal 3 through liquid crystal cells C ₁₁ , C ₂₁ . . . Cnm, respectively.

Further _, an n-stage shift register 4 is provided, and horizontal frequency clock signals φ _1V and _{φ 2V are} supplied to this shift register 4. The drive pulse signals φ _V1 , φ _V2 ...φ _Vo , which are scanned sequentially, are
The switching elements M ₁₁ to Mnm are supplied to control terminals for each row (M ₁₁ to M _1n ), (M ₂₁ to _{M 2n} ), . . . (M _o1 to Mnm) in the X-axis direction, respectively. Note that, like shift register 2, shift register 4 also has V _T
and V _DD are supplied.

That is, in this circuit, shift registers 2 and 4 are supplied with clock signals φ _1H , φ _2H , φ _1V , and φ _2V as shown in FIGS. 2A and 2B. The shift register 2 outputs φ _H1 to φ _Hn for each pixel period as shown in FIG. 2C, and the shift register 4 outputs φ V1 to φ for each horizontal period as shown in FIG. _2D . _Vo is output. Furthermore, the input terminal 1 is supplied with a signal as shown in FIG. 2E.

When φ _V1 and φ _H1 are output, switching elements M ₁ and M ₁₁ to _{M 1n} are turned on, and input terminal 1 → M ₁ → L ₁ → M ₁₁ → C ₁₁ → target terminal 3
A current path is formed to input terminal 1 to liquid crystal cell _C11.
The potential difference between the signal supplied to the target terminal 3 and the target terminal 3 is supplied. Therefore, for the capacity of this cell C ₁₁ ,
A charge corresponding to the potential difference due to the signal of the first pixel is sampled and held. The light transmittance of the liquid crystal changes depending on the amount of charge. The same thing is done sequentially for cells C ₁₂ to _{C on} , and when the next field signal is supplied, each cell
The amount of charge of C ₁₁ to _{C on} is rewritten.

In this way, the light transmittance of the liquid crystal cells C ₁₁ to C _on is changed corresponding to each pixel of the video signal, and this is sequentially repeated to display a television image.

By the way, in manufacturing such a liquid crystal display device, as shown in FIG.
A switch matrix circuit 11 for display scanning such as M ₁₁ to _{M on} is formed, and a liquid crystal 12 is sealed above this with a sealing material 13 and an upper glass 14 . That is, in this portion, the liquid crystal 12 and the like are provided to protrude from the silicon chip 10. Furthermore, a bonding pad 15 is provided for automatically bonding the device to the terminal pin of the case.

However, in this bonding apparatus for automatic bonding, a sensor detects the bonding pad 15 and positions the bonding jig. In this case, the sensor of the bonding device cannot be provided at the same position as the bonding jig, but is provided apart from the bonding jig, so that detection is performed at a predetermined angle with respect to the bonding surface. On the other hand, if the liquid crystal 12 or the like is provided to protrude from the silicon chip 10 as described above, for example, when detection is performed at an angle as shown by the broken line in the figure, the protrusion of the liquid crystal 12, etc. This creates a blind spot in detection.

For this reason, in conventional devices, the liquid crystal 1
The second class and the bonding pad 15 are spaced apart to avoid a blind spot, and the separation creates an unnecessary space, reducing the utilization efficiency of the silicon chip 10.

Purpose of the invention In view of the above points, the present invention is intended to improve the utilization efficiency of integrated circuit chips.

Summary of the invention The present invention is a liquid crystal display device in which a switch matrix circuit for display scanning is formed on an integrated circuit chip, and a liquid crystal is provided above the integrated circuit chip. A bonding pad for bonding is provided to avoid a blind spot caused by the liquid crystal of the sensor of the bonding device that performs the bonding, and a desired circuit is formed in a portion of the integrated circuit chip that is the blind spot. According to this liquid crystal display device, the utilization efficiency of integrated circuit chips can be improved.

Embodiment In FIG. 4, a circuit 21 is installed on the silicon chip 10 between the liquid crystal 12 etc. and the bonding pad 15.
form. Here, this circuit 21 is formed inside the silicon chip 10, so that there is no risk of widening a blind spot. Therefore, a new circuit 21 can be provided while leaving the blind spot as it was before, thereby increasing the utilization efficiency of the silicon chip 10. Note that the circuit 21 includes a video signal amplifier,
A circuit before the input terminal 1, such as a video signal processing circuit, may be provided.

Further, as the circuit 21, a digital circuit such as a clock system may be formed. In that case, in order to prevent interference between circuits such as deterioration of image quality due to mixing of digital signals, the wells forming the respective circuits on the substrate are separated, for example, as shown in FIGS. 5 and 6. This allows both the analog circuit 21A and the digital circuit 21B to be formed on a single chip, further increasing utilization efficiency, and since conventionally external circuits are built-in,
The entire device can be made extremely compact. Furthermore, by incorporating a clock system, the number of bonding pads can be reduced.

Furthermore, as shown in FIG. 7, the shift register 2,
4 etc. may also be incorporated, and in that case, the wells of each circuit are separated to prevent mutual interference.

Note that the integrated circuit chip is not limited to the above-mentioned silicon, but may also be made of silicon-on-sapphire, polysilicon, amorphous silicon, organic semiconductor, or the like.

Effects of the invention According to the invention, it was possible to improve the utilization efficiency of integrated circuit chips.

[Brief explanation of the drawing]

1 to 3 are diagrams for explaining a conventional device, FIG. 4 is a configuration diagram of one example of the present invention, and FIGS. 5 to 7 are diagrams for explaining other examples. 10 is an integrated circuit chip, 11 is a switch matrix circuit, 12 is a liquid crystal, 15 is a bonding pad, and 21 is a circuit.

Claims (1)

[Scope of utility model registration request] In a liquid crystal display device in which a switch matrix circuit for display scanning is formed on an integrated circuit chip and a liquid crystal is provided above the integrated circuit chip, a bonding pad for automatically bonding the integrated circuit chip is provided. A liquid crystal display device, characterized in that it is provided to avoid a blind spot caused by the liquid crystal of a sensor of a bonding device that performs the bonding, and a desired circuit is formed in a portion of the integrated circuit chip that is the blind spot.