JP2002072949A - Portable terminal with image pickup function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to watch an almost color image on a portable terminal, and moreover transmit a color data from the portable telephone. SOLUTION: This portable terminal comprises a color image sensor for picking up a color image, an image data processing circuit for conversion- processing the color image data from the color image sensor into a color image digital color difference data, a RAM for temporarily storing the color image digital color difference data from the image data processing circuit, an LCD controller with a built-in VRAM for displaying the data of the RAM with liquid crystal, a monochrome liquid crystal panel for displaying with liquid crystal an LCD panel signal outputted from the LCD controller with built-in VRAM, a communication control IC for sending the RAM data to the portable telephone, a ROM in which a data control program in the portable terminal with a pickup function is written, and a CPU for executing the program.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable terminal having an image pickup function for taking in an image by a color image sensor, displaying the image on a liquid crystal display panel, and transmitting data from a portable telephone.

[0002]

2. Description of the Related Art In general, a conventional technique for taking in an image from a color image sensor, displaying the image on a liquid crystal display (hereinafter, referred to as an LCD) and transmitting data from a portable telephone will be described with reference to FIG. As shown in FIG. 2, a mobile terminal 45 having an imaging function surrounded by a dotted line,
A mobile phone 25 and a mobile phone connection cable 24 for connecting them are provided.

The color image sensor 12 captures the image passed through the lens 11 into the image data processing circuit 15 as color image data 13 in accordance with an imaging timing signal 14 output from the image data processing circuit 15. .

The image data processing circuit 15 converts the color image data 13 into a PTE (Society of Motion).
Picture and TelevisionEn
The image data is converted into color image digital color difference data (hereinafter referred to as YUV data) proposed by 125M or the like.

[0005] Central processing unit (hereinafter referred to as CPU) 1
8 is a read-only memory element (R
By reading and executing a program via a data bus 19 from a read only memory (hereinafter referred to as a ROM) 17, while watching the waveform of an output synchronization clock 26 output from the image data processing circuit 15,
The UV data is read into the CPU 18 as READ data 27.

The read data 27 captured by the CPU 18 is transmitted to the random access
Memory (Random Access Memory):
(Hereinafter referred to as a RAM) 16.

The program read from the ROM 17 via the data bus 19 updates the display contents. When there is an instruction, the CPU 18 reads the YUV data from the RAM 16 and sends the data to the RGB conversion circuit 41 via the data bus 19, and outputs a conversion enable signal 44 for converting the YUV data to the RGB data.

In the RGB conversion circuit 41, the CPU 1
The YUV data is converted into digital red, green, and blue (Red, Green, Blue) by the conversion enable signal 44 from
The data is converted to RGB (hereinafter abbreviated as RGB) and output as RGB data 42 to a VRAM built-in liquid crystal display controller 20 having a built-in Video RAM (RAM for storing liquid crystal display data).

The CPU 18 converts the RGB data 42 into a VRA
In order to write into the VRAM of the M built-in liquid crystal display controller 20, a VRAM write signal 28 is output.

In the display operation of the VRAM built-in liquid crystal display controller 20, the data of the VRAM is sent to the color liquid crystal panel 43 via the liquid crystal data bus 21 and displayed.

The YUV data stored in the RAM 16 is transmitted from the RAM 16 via the data bus 19 to the CPU 18 when a transmission command is issued during execution of a program by the CPU 18.
And the communication control I via the communication data bus 22.
Sent to C23.

The communication control IC 23 sends the YUV data read from the RAM 16 to the mobile phone 25 through the mobile phone connection cable 24, and transmits the YUV data from the mobile phone 25.

[0013]

As described above, as described above,
In a mobile terminal with an imaging function using the color image sensor 12, a color liquid crystal panel 43 must be used for liquid crystal display.

A portable terminal with a color image pickup function consumes a large amount of total power, and furthermore, when a color liquid crystal display is provided, a backlight is provided to emit light from a cold cathode tube from the back of the liquid crystal panel to make colors vivid. Therefore, a large amount of power is required, and the battery life is extremely shortened.

Even when the color image sensor 12 is mounted as described above, a low power consumption monochrome LCD panel is mounted and displayed on the portable terminal 25.

However, in order to reproduce a color display state as faithfully as possible, it is necessary to use a monochrome display with gradation as a monochrome display.

The image data handled inside the portable terminal 25 is
The liquid crystal display must have monochrome image data, and the mobile phone must have color image data to transmit.

A portable terminal equipped with a color image pickup function should be able to transmit a color image with a portable telephone. However, when the photographed content is viewed on the portable terminal, it is not necessary to view the image in color. What is necessary is just to display on a low power consumption monochrome liquid crystal panel.

However, a monochrome liquid crystal panel cannot be displayed with the RGB data as it is. When a color image is viewed in black and white, it is necessary to add shading, that is, to give a gradation, in order to make the image easy to see and to display close to the real thing.

[Object of the Invention] An object of the present invention is to solve the above-mentioned problems and to provide an image similar to a captured color image on a portable terminal by giving gradation in monochrome display, and An object of the present invention is to provide a mobile terminal with an imaging function capable of transmitting color data from a mobile phone.

[0021]

Means for Solving the Problems In order to achieve the above object, a portable terminal with an imaging function according to the present invention employs the following means.

A portable terminal with an image pickup function according to the present invention is characterized in that color image data of a color image sensor is displayed in monochrome gradation.

A portable terminal with an imaging function according to the present invention is a color image sensor for capturing a color image, an image data processing circuit for converting color image data from the color image sensor into color image digital color difference data, and the image data. A RAM for temporarily storing color image digital color difference data from the processing circuit, an LCD controller with a built-in VRAM for displaying the data of the RAM on a liquid crystal, and a monochrome liquid crystal panel for liquid crystal display with an LCD panel signal output from the LCD controller with a built-in VRAM. Communication control IC for sending data from the RAM to a mobile phone
A ROM in which a data control program in the portable terminal with an imaging function is written, and a central processing unit that executes the program. Color image data taken in from the color image sensor is processed by the image data processing circuit. The CPU converts the YUV data into the YUV data and stores the data in the RAM. The CPU converts only the data having the luminance information out of the YUV data stored in the RAM into the VUV data.
Write to VRAM of LCD controller with built-in RAM,
An LCD controller with a built-in VRAM reads data having luminance information from the VRAM and displays the data on a monochrome liquid crystal panel in monochrome.

[Operation] In the portable terminal with an imaging function according to the present invention, the YUV data stored in the RAM is converted into RGB data.
Without conversion to data, only data having luminance information (hereinafter referred to as Y data) is used as display data in a VRAM.
To be stored. This Y data is data that can represent only the brightness of the image.

When storing the data in the VRAM, the CPU selects the upper bits of the Y data read from the RAM,
The gradation display on the monochrome liquid crystal panel is determined. For example,
When the upper 4 bits of the Y data are selected, 16 gray scales are displayed.

The CPU selects the higher-order bits of the Y data in accordance with the maximum possible gradation display of the liquid crystal display controller with a built-in VRAM.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a color image sensor, a monochrome gradation display by a signal processing output thereof, and a color image transmission operation by a mobile phone according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

[Description of Configuration of Monochrome Tone Display: FIG. 1] First, a detailed description will be given of the configuration of the portable terminal with an imaging function of the present invention capable of monochrome display even when the color image sensor 11 is used with reference to FIG. Will be described. As shown in FIG. 1, a mobile terminal 32 having an imaging function surrounded by a dotted line, a mobile phone 25, and a mobile phone connection cable 24 for connecting them are provided.

The color image sensor 12 has an imaging timing signal 14 output from the image data processing circuit 15.
, The images passed through the lens 11 are sequentially converted into image data 13
To the image data processing circuit 15.

The image data processing circuit 15 converts the input image data 13 into digital YUV data. Y
The UV data is converted into Y data having luminance information and data having color information (hereinafter referred to as UV data).

READ at the timing shown in FIG.
Data 27 (8 bits each for Y data and UV data) is output.

The CPU 18 takes in the Y data and the UV data in accordance with the timing of the output synchronization clock 26, and
Write to AM16.

The fetched Y data is 8 bits, and the number of monochrome gradation display can be selected by selecting the higher-order bit having the weight of the luminance information.

If the liquid crystal display controller 20 with a built-in VRAM can perform monochrome display with a maximum of 16 gradations, the CPU 1
8 selects only the upper 4 bits of the 8 bits of Y data read out from the RAM 16 via the data bus 19 when updating the display content by the program of the ROM 17, and incorporates it into the VRAM built-in liquid crystal display controller 20 via the data bus 19. A VRAM write signal 28 is output to the written VRAM to write data.

Liquid crystal display controller 20 with built-in VRAM
Represents the upper 4 bits of the written 8 bits of Y data as 1
The data is converted into 6 gradations and output to the monochrome LCD panel 31 via the liquid crystal data bus 21 to realize a monochrome 16 gradation display.

In the case where color image data is transmitted by the portable telephone according to the program stored in the ROM 17, the CP
U18 reads the Y data and the UV data from the RAM 16 via the data bus 19, and outputs the data to the communication data bus 22 as it is.

The communication control IC 23 includes a communication data bus 22
Are output to the mobile phone 25 via the mobile phone connection cable 24, and the mobile phone 25 transmits this data. This means that the YUV data converted by the image data processing circuit 15 has been transmitted.

[Explanation of Operation by Configuration of FIG. 1] FIG. 1 shows a portable terminal 32 and a portable telephone 2 having an imaging function surrounded by a dotted line.
5 and a mobile phone connection cable 24 connecting them.

The color image sensor 12 has an image pickup timing signal 14 output from the image data processing circuit 15.
, And sequentially outputs the images passed through the lens 11 to the image data processing circuit 15 as image data 13.

The image data processing circuit 15 converts the input image data 13 into digital YUV data.

The CPU transfers the Y data and the UV data to the READ data 2 in accordance with the timing of the output synchronization clock 26.
7 and written into the RAM 16.

When updating the display contents by the program in the ROM 17, the CPU 18 transfers the data selected from the upper part of the Y data read out from the RAM 16 via the data bus 19 to the liquid crystal display controller 20 with a built-in VRAM via the data bus 19. VRAM in built-in VRAM
A write signal 28 is output to write data.

Liquid crystal display controller 20 with built-in VRAM
Outputs the written Y data to the monochrome LCD panel 31 via the liquid crystal data bus 21 to realize monochrome display.

When color image data is transmitted by the portable telephone according to the program stored in the ROM 17, the CPU
Reference numeral 18 reads the Y data and UV data from the RAM 16 via the data bus 19, and outputs the data to the communication data bus 22 as it is.

The communication control IC 23 includes a communication data bus 22
Is output to the mobile phone 25 via the mobile phone connection cable 24, and the mobile phone 25 transmits this data.

[Explanation of Operation: FIG. 3] Next, the operation based on the configuration of the portable terminal with an imaging function of the present invention will be described with reference to the waveform diagram of FIG. FIG. 3 is a waveform diagram showing the timing relationship between the output synchronization clock 26 output from the image data processing circuit 15 and the READ data 27.

The READ data 27 is Y data having luminance information.
The data is composed of 8 bits, and the UV data having color information is composed of 8 bits. In FIG. 3, the output synchronization clock 2
6, the timing relationship between the Y data and the UV data is 8 bits and the UV data is 8 bits.

The Y data is output while the output synchronization clock 26 is output twice. U data is output during the first half of the output synchronization clock 26, and V data is output during the second half of the output synchronization clock 26. (U data and V data are output alternately for UV data.)

The time during which the Y data is output is one pixel of the color image digital data. In this manner, the color of one pixel is represented by the Y data, U data, and V data.

The Y data, U data, and V data are output in synchronization with the falling timing of the output synchronization clock 26, respectively.

[0051]

As is clear from the above description, by realizing monochrome gradation display by a monochrome LCD panel based on color data in a portable terminal, a portable terminal with lower power consumption is realized and battery life is extended. It becomes possible to extend dramatically.

In monochrome image data, the number of bits representing one pixel is smaller than that of color image data, such as 24 bits for YUV for color and 4 bits for 16 gradations for monochrome. As a result, the display data can be updated in a short time,
More images can be updated in one second.

Further, in the case of a color LCD display, RGB data is required as display data, but in the case of a monochrome LCD display as in the present invention, since Y data of YUV data can be used, a conversion circuit from YUV data to RGB data is required. Absent.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram illustrating a configuration of a mobile terminal with an imaging function according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram illustrating a configuration of a portable terminal with an imaging function according to the related art.

FIG. 3 is a waveform chart for explaining the operation of the mobile terminal with an imaging function according to the embodiment of the present invention.

[Explanation of symbols]

11: Lens 12: Color image sensor 13: Image data 14: Imaging timing signal 15: Image data processing circuit 16: Random Access Memory (R
AM) 17: Read-only storage element (ROM) 18: Central processing unit (CPU) 19: Data bus 20: VRAM built-in liquid crystal display controller 21: LCD panel signal 31: Monochrome LC
D panel 22: Communication data bus 23: Communication control IC 24: Mobile phone connection cable 25: Mobile phone 26: Output synchronization clock 27: READ data 28: VRAM write signal 31: Monochrome LCD panel 32: Mobile terminal (with monochrome LCD) 4
1: RGB conversion circuit 42: RGB data 43: color LCD panel 44: conversion enable signal 45: portable terminal (with color LCD)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 1/00 H04N 5/225 B 5K011 H04N 1/60 H04B 7/26 X 5K027 1/46 H04N 1/40 D 5K067 5/225 1/46 CF term (reference) 5B057 BA02 CA01 CA08 CA12 CA16 CB02 CB08 CB12 CB16 CC01 CE17 CH01 5C022 AB67 AB68 AC03 AC42 AC69 5C077 MP08 PP31 PP34 PQ12 PQ22 SS01 SS06 TT09 TT10 5C079 HA11 MA MA02 MA17 NA01 NA09 NA25 5C080 AA10 BB05 DD26 EE29 GG07 JJ02 JJ04 KK47 5K011 AA03 HA06 JA01 KA03 5K027 AA11 BB01 EE01 EE11 FF01 FF22 MM17 5K067 AA34 AA42 BB04 DD52 EE02 KK23 H23

Claims (2)

[Claims] 1. A mobile terminal with an imaging function, wherein the mobile terminal with an imaging function displays color image data of a color image sensor in monochrome gradation. 2. A color image sensor for capturing a color image, an image data processing circuit for converting color image data from the color image sensor into color image digital color difference data, and a color image digital color difference from the image data processing circuit. RAM for temporarily storing data, LC with built-in VRAM for displaying the data of the RAM on liquid crystal
A D controller, a monochrome liquid crystal panel for performing liquid crystal display using an LCD panel signal output from the LCD controller with a built-in VRAM, a communication control IC for sending the data of the RAM to a mobile phone, and a data control program inside the mobile terminal with an imaging function And a central processing unit that executes the program. The color image data taken in from the color image sensor is converted into YUV data by the image data processing circuit and stored in the RAM. CPU is R
Of the YUV data stored in the AM, only data having luminance information is written to the VRAM of the LCD controller with a built-in VRAM, and the LCD controller with a built-in VRAM reads out the data having the luminance information from the VRAM to a monochrome liquid crystal panel. A mobile terminal with an imaging function, which performs monochrome display.