JP2009175181A - Portable electronic apparatus - Google Patents

Portable electronic apparatus Download PDF

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JP2009175181A
JP2009175181A JP2008010721A JP2008010721A JP2009175181A JP 2009175181 A JP2009175181 A JP 2009175181A JP 2008010721 A JP2008010721 A JP 2008010721A JP 2008010721 A JP2008010721 A JP 2008010721A JP 2009175181 A JP2009175181 A JP 2009175181A
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input
unit
chromaticity
signal
level
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JP2008010721A
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JP5166050B2 (en
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Kosuke Kubota
孝介 久保田
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Panasonic Corp
パナソニック株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To meet the demand for higher image quality without increasing cost by raising color of an image displayed on an LCD in accordance with chromaticity of light emitted from an LED. <P>SOLUTION: An LED lighting an LCD 107 from its rear side is mounted in a planar light-emitting device 102, and electric wiring having circuit configurations different by ranks of chromaticity of the mounted LED is formed in the planar light-emitting device 102. An input/output part 103 supplies a high level signal to the planar light-emitting device 102, and a signal different in level due to difference of circuit configurations of the planar light-emitting device 102 is inputted from the planar light-emitting device 102. A control part 104 discriminates a rank of chromaticity of the LED by a detection result of the level of the signal outputted from the planar light-emitting device 102. A color correction part 106 corrects the color of an image displayed on the LCD. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable electronic device, and more particularly to a portable electronic device that reduces variations in chromaticity of light emitted by a white light emitting diode mounted on a backlight.

  As a conventional general liquid crystal display device (hereinafter referred to as “LCD”), those shown in FIGS. 20 to 21B are known. 20 is a cross-sectional view of a conventional LCD 1, FIG. 21A is a plan view of the LCD 1, and FIG. 21B is a plan view in which a part of the LCD 1 is broken.

  The LCD 1 includes a polarizing plate 11, a glass substrate 12, an LCD driver IC 13 and an FPC 14 electrically and mechanically connected to a glass substrate 15, a polarizing plate 16, a rim sheet 17, and light collecting sheets 18 and 19 that collect diffused light in the vertical direction. , A diffusion sheet 20 for uniform brightness unevenness, a light emitting diode (hereinafter referred to as “LED”) 22 connected to the FPC 21, a light guide plate 23 for guiding the light of the LED 22, and light spreading downward in the LED 22 It includes a reflection sheet 24 that reflects in the direction and a holder 25 that houses them. The polarizing plate 11, the glass substrate 12, the LCD driver IC 13, the glass substrate 15 and the polarizing plate 16 constitute a liquid crystal panel body. Further, the light collecting sheets 18 and 19, the diffusion sheet 20, the LED 22, the light guide plate 23, and the reflection sheet 24 constitute a planar light emitting device (backlight). The rim sheet 17 is for attaching the liquid crystal panel body and the planar light emitting device.

  Further, from FIG. 21B, the LCD 1 has an effective light emitting area 50 (outlined portion in the rim sheet 17) by the LED 22. Further, the LED 22 is electrically and mechanically connected to a circuit pattern formed on the bottom side of the FPC 21 (the back side of the paper surface in FIG. 21B).

  In recent years, there has been a growing demand for higher image quality for the LCD 1 mounted on portable electronic devices such as mobile phones, and it has become necessary to reduce variations in the colors of images displayed on the LCD 1. Further, since the LCD 1 is illuminated from the back by the LED 22 mounted on the planar light emitting device, the chromaticity variation of the LED 22 of the planar light emitting device is reduced in order to reduce the color variation of the image displayed on the LCD 1. Need to be reduced.

  Conventionally, a method of Patent Document 1 is known as a method for reducing variation in chromaticity of LEDs. Japanese Patent Application Laid-Open No. 2004-228561 suppresses color tone unevenness by arranging light sources having chromaticities that deviate from the center of the target chromaticity adjacent to each other.

In general, a white LED is used for a planar light emitting device of an LCD that performs color display. The chromaticity of the white LED is normally divided into a plurality of ranks according to the chromaticity as shown in FIG. FIG. 22 is a diagram illustrating an example of LED ranks according to chromaticity. In the case of FIG. 22, the chromaticity is divided into 12 ranks (a1, a2, a3, b1, b2, b3, c1, c2, c3, d1, d2, d3). Further, since the LED covers the LED element, which is a light emitter, with a phosphor, chromaticity variation occurs due to variations in the direction of the arrow 70 due to the wavelength of the LED element and variations in the direction of the arrow 80 due to the phosphor covering the LED element. .
JP 2001-184918 A

  However, in the conventional apparatus, since chromaticity variation occurs at the time of manufacturing the LED, if only an LED having a specific chromaticity is obtained, the cost is increased. Therefore, the chromaticity varies to some extent from the viewpoint of cost reduction. There is a problem that certain LEDs, that is, LEDs having a plurality of chromaticity ranks, must be used, and the demand for high image quality cannot be met. Moreover, in patent document 1, since it is necessary to obtain LED which has specific chromaticity, there exists a problem of causing the increase in cost.

  The present invention has been made in view of the above points, and responds to the demand for higher image quality without increasing the cost by correcting the color of the image displayed on the LCD in accordance with the chromaticity of the light emitted from the LED. An object of the present invention is to provide a portable electronic device that can be used.

  The portable electronic device of the present invention includes a display unit that displays an image on a liquid crystal display surface, a backlight that illuminates the liquid crystal display surface from the back by a white light emitting diode, and an identification unit that identifies the chromaticity of the white light emitting diode. And a color correction unit that corrects the color of the image based on the chromaticity identified by the identification unit.

  According to the present invention, by correcting the color of the image displayed on the LCD according to the chromaticity of the light emitted from the LED, it is possible to meet the demand for higher image quality without increasing the cost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of portable electronic device 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, the control unit 110 includes an input / output unit 103, a control unit 104, an image data generation unit 105, and a color correction unit 106.

  The LED power supply unit 101 receives an LED power supply control signal from the input / output unit 103 and supplies power to the planar light emitting device 102.

  The planar light emitting device 102 is driven by receiving power from the LED power supply unit 101. Further, the planar light emitting device 102 has LEDs of a predetermined chromaticity rank (not shown in FIG. 1), and the LCD 107 is illuminated from the back by the LEDs. The planar light emitting device 102 is connected to the input / output unit 103 by one signal line 121 for input and two signal lines 122 and 123 for output. In addition, when a high level signal is input from the input / output unit 103 via the signal line 121, the surface light emitting device 102 has different levels for each LED chromaticity rank via the signal lines 122 and 123. An output signal is output to the input / output unit 103. The detailed configuration of the planar light emitting device 102 will be described later.

  The input / output unit 103 outputs an LED power control signal for controlling the supply of power from the LED power unit 101 according to the control of the control unit 104. The input / output unit 103 includes an output port 103a, an input port 103b, and an input port 103c. Further, the input / output unit 103 outputs a high-level signal from the output port 103 a to the planar light emitting device 102 via the signal line 121 under the control of the control unit 104. Then, the input / output unit 103 outputs a signal input from the planar light emitting device 102 to the input ports 103 c and 103 b via the signal lines 122 and 123 to the control unit 104. The signal lines 122 and 123 are pulled down via resistors 124 and 125, respectively.

  The control unit 104 as an identification unit controls the output timing of the LED power control signal to the input / output unit 103. The control unit 104 controls the output timing of the high level signal output from the output port 103a of the input / output unit 103, and detects the level of the signal input from the input ports 103b and 103c of the input / output unit 103, respectively. . Further, the control unit 104 identifies the rank of the chromaticity of light emitted from the LED mounted on the planar light emitting device 102 based on the detection result of the signal level. Then, the control unit 104 controls the color correction unit 106 to correct the color of the image data based on the identification result. An image color correction method will be described later.

  The image data generation unit 105 generates image data and outputs the generated image data to the color correction unit 106.

  The color correction unit 106 corrects the image color of the image data input from the image data generation unit 105 in accordance with the control of the control unit 104. Then, the color correction unit 106 outputs the image data of the corrected image to the LCD 107.

  The LCD 107 serving as a display unit displays an image of the image data input from the color correction unit 106. The LCD 107 is illuminated from the back by the LED of the planar light emitting device 102.

  The control unit 110 controls the operation of the LCD 107 by outputting a synchronization signal and a liquid crystal operation control signal to the LCD 107.

  Next, the configuration of the planar light emitting device 102 will be described with reference to FIG. FIG. 2 is a diagram illustrating the configuration of the planar light emitting device 102 and the input / output unit 103.

  The LED 201 is, for example, a white LED, and a LED having a predetermined chromaticity rank is used. The LED 201 is driven by receiving power from the LED power supply unit 101 to illuminate the LCD 107 from the back side. When the LED 201 is a white LED, it is formed by covering the light emitting part of a blue LED with a yellow phosphor or green and red phosphors. In FIG. 2, the LED 201 is composed of three LEDs, and these LEDs have the same chromaticity rank.

  The rank identifying unit 202 as a holding unit holds a different circuit configuration for each chromaticity rank of the LED 201, and when the high level signal output from the output port of the input / output unit 103 is input, the circuit configuration difference Due to the above, a high level or low level signal is output to the input ports 103 b and 103 c of the input / output unit 103 according to the chromaticity rank of the LED 201. In addition, the rank identifying unit 202 forms electrical wiring having a different circuit configuration for each chromaticity rank of the LED 201 on a circuit board such as an FPC on which the LED 201 is mounted. The rank identifying unit 202 may be formed on a circuit board separate from the circuit board on which the LEDs 201 are mounted.

  FIG. 3A to FIG. 3D are diagrams illustrating the rank identifying unit 202 having a different circuit configuration for each chromaticity rank of the LED 201. FIG. 3A to FIG. 3D show a case where LEDs 201 having four chromaticity ranks are used. For example, this can be identified using the LEDs 201 of the four chromaticity ranks a2, a3, b2, and b3 in FIG.

  From FIG. 3A to FIG. 3D, the rank identifying unit 202 has one input terminal 202a and two output terminals 202b and 202c. In the rank identifying unit 202, the input terminal 202a and the output terminal 202b are connected by an electrical wiring 308 formed by printing or the like, and the input terminal 202a and the output terminal 202c are formed by printing or the like. They are connected by electrical wiring 309. The electrical wiring 308 is provided with lands 308a and 308b for connecting resistors in series, and the electrical wiring 309 is provided with lands 309a and 309b for connecting resistors in series. Also, no wiring pattern is formed between the land 308a and the land 308b and between the land 309a and the land 309b, and is open when no resistor is connected. The rank identifying unit 202 has a circuit configuration in which a resistor is connected in series to the electrical wirings 308 and 309 and a circuit configuration not connected in accordance with the chromaticity rank of the LED 201. The resistance value of the resistor connected in series to the electric wirings 308 and 309 has a resistance value as low as 0Ω or close to 0Ω. Therefore, in the electric wiring 308, when the resistor 302 is connected in series, the input terminal 202a and the output terminal 202b are electrically short-circuited. Similarly, in the electrical wiring 309, when the resistor 301 is connected in series, the input terminal 202a and the output terminal 202c are electrically short-circuited. In addition, when a resistor is not connected in series in the electric wiring 308, the input terminal 202a and the output terminal 202b are electrically insulated. Similarly, when a resistor is not connected in series in the electrical wiring 309, the input terminal 202a and the output terminal 202c are electrically insulated.

  That is, in FIG. 3A, the rank identifying unit 202 has no resistor connected to any of the first path 310 of the electrical wiring 309 and the second path 311 of the electrical wiring 308. In this case, since the signal levels of the signal lines 122 and 123 are pulled down via the resistors 124 and 125, the signal level is “0”. Accordingly, when a high level “1” signal is input from the output port 103 a of the input / output unit 103 to the input terminal 202 a of the rank identifying unit 202 via the signal line 121, the signal is input from the output terminal 202 c via the signal line 122. The level of the signal input to the input port 103 c of the output unit 103 and the signal input from the output terminal 202 b to the input port 103 b of the input / output unit 103 via the signal line 123 are both low level “ It is detected as a “0” signal.

  In FIG. 3B, the rank identifying unit 202 includes a resistor 301 connected in series to the first path 310 of the electrical wiring 309 and a resistor connected to the second path 311 of the electrical wiring 308. Absent. Therefore, when a high level “1” signal is input from the output port 103a of the input / output unit 103 to the input terminal 202a of the rank identifying unit 202 via the signal line 121, the output terminal 202c is short-circuited with the input terminal 202a. Therefore, the level of the signal input from the output terminal 202c to the input port 103c of the input / output unit 103 via the signal line 122 is detected as a high level “1” signal in the control unit 104, and is output from the output terminal 202b. The level of the signal input to the input port 103b of the input / output unit 103 via the signal line 123 is detected as a low level “0” signal in the control unit 104 as in the case of FIG.

  In FIG. 3C, the rank identifying unit 202 does not have a resistor connected to the first path 310 of the electrical wiring 309, and a resistor 302 is connected in series to the second path 311 of the electrical wiring 308. ing. Accordingly, when a high level “1” signal is input from the output port 103 a of the input / output unit 103 to the input terminal 202 a of the rank identifying unit 202 via the signal line 121, the signal is input from the output terminal 202 c via the signal line 122. The level of the signal input to the input port 103c of the output unit 103 is detected as a low level “0” signal in the control unit 104 as in the case of FIG. 3A, and the signal line 123 is connected from the output terminal 202b. The level of the signal input to the input port 103b of the input / output unit 103 is detected as a high level “1” signal in the control unit 104 because the output terminal 202b is short-circuited to the input terminal 202a.

  In FIG. 3D, in the rank identifying unit 202, resistors 301 and 302 are connected in series to both the first path 310 of the electrical wiring 309 and the second path 311 of the electrical wiring 308. Accordingly, when a high level “1” signal is input from the output port 103 a of the input / output unit 103 to the input terminal 202 a of the rank identifying unit 202 via the signal line 121, the signal is input from the output terminal 202 c via the signal line 122. The level of the signal input to the input port 103c of the output unit 103 and the signal input from the output terminal 202b to the input port 103b of the input / output unit 103 via the signal line 123 are the same for both the output terminals 202b and 202c. In the control unit 104, both are detected as high level “1” signals.

  FIG. 4 is a diagram showing the presence or absence of resistance for each rank of the chromaticity of the rank identifying unit 202 shown in FIGS. 3 (a) to 3 (d).

  Next, an image color correction method will be described with reference to FIG. FIG. 5 is a flowchart showing a method for correcting the color of an image.

  First, the LED power supply unit 101 is turned on when an LED power supply control signal is input (step ST501).

  Next, the input / output unit 103 outputs a high level signal from the output port 103a via the signal line 121 to the planar light emitting device 102 (H output) (step ST502).

  Next, the control unit 104 is based on the level of the signal input to the input port 103 c of the input / output unit 103 via the signal line 122 and the signal input to the input port 103 b of the input / output unit 103 via the signal line 123. Logic determination is performed (step ST503).

  Next, control section 104 determines whether or not the level of the signal input to input port 103c and the level of the signal input to input port 103b are both at a low level “L” (step ST504).

  If both are at the low level, the control unit 104 refers to a table stored in advance. FIG. 6 is a diagram illustrating a table stored in the control unit 104. As shown in FIG. 6, when both the input port 103c and the input port 103b are at the low level, the control unit 104 selects that the chromaticity rank of the LED 201 is rank 1 and color correction 1 is performed. .

  Next, the color correction unit 106 performs color correction 1 according to the control of the control unit 104 (step ST505).

  FIG. 7A to FIG. 7D are diagrams illustrating a method for correcting the color of an image.

  7A, the color correction unit 106 performs color correction (color correction 1) on the image displayed on the LCD 107 to the target chromaticity variation range # 701 with respect to the chromaticity of the LED 201 with chromaticity rank 1. The color of the image data is corrected so that it can be displayed as an image.

  FIG. 8A to FIG. 8C are diagrams illustrating a method for correcting the color of an image. FIG. 8A is a diagram showing the relationship between red (R) input tone and output tone, and FIG. 8B is the relationship between green (G) input tone and output tone. FIG. 8C is a diagram showing the relationship between the blue (B) input gradation and the output gradation.

  For example, when the color correction unit 106 performs color correction 1 of color correction 1 in FIG. 7A, the input gradation and output gradation of green (G) indicated by a broken line in FIG. From the equal state, the image data is corrected so that the output gradation of green (G) indicated by the solid line in FIG. 8B is smaller than the input gradation. In other words, the color correction unit 106 corrects the color of the image data so that the color tone shifts in the magenta direction, which is a complementary color of green, by limiting the output gradation of green (G). In the case of FIG. 8, the color correction unit 106 does not correct red (R) and blue (B), but restricts the output gradation of red (R), green (G), and blue (B). When done properly, the color shift can be freely controlled.

  Returning to FIG. 5, in step ST504, when neither the level of the signal input to the input port 103c nor the level of the signal input to the input port 103b is the low level “L”, the control unit 104 switches to the input port 103c. It is determined whether the level of the input signal is high level “H” and the level of the signal input to input port 103b is low level “L” (step ST506).

  When the level of the signal input to the input port 103c is high level “H” and the level of the signal input to the input port 103b is low level “L”, the control unit 104 refers to the table of FIG. Accordingly, the control unit 104 determines the chromaticity of the LED 201 when the level of the signal input to the input port 103c is high level “H” and the level of the signal input to the input port 103b is low level “L”. The rank is rank 2, and it is selected to perform color correction of color correction 2.

  Next, the color correction unit 106 performs color correction 2 according to the control of the control unit 104 (step ST507).

  As shown in FIG. 7B, the color correction unit 106 performs color correction (color correction 2) on the image displayed on the LCD 107 to the target chromaticity variation range # 701 with respect to the chromaticity of the LED 201 of chromaticity rank 2. The color of the image data is corrected so that it can be displayed as an image.

  On the other hand, in step ST506, when the level of the signal input to the input port 103c is high level “H” and the level of the signal input to the input port 103b is not low level “L”, the control unit 104 sets the input port 103c. It is determined whether the level of the signal input to the low level is “L” and the level of the signal input to the input port 103b is the high level “H” (step ST508).

  When the level of the signal input to the input port 103c is low level “L” and the level of the signal input to the input port 103b is high level “H”, the control unit 104 refers to the table of FIG. Accordingly, the control unit 104 determines the chromaticity of the LED 201 when the level of the signal input to the input port 103c is low level “L” and the level of the signal input to the input port 103b is high level “H”. The rank is rank 3, and it is selected to perform color correction of color correction 3.

  Next, the color correction unit 106 performs color correction of color correction 3 according to the control of the control unit 104 (step ST509).

  As shown in FIG. 7C, the color correcting unit 106 corrects the image displayed on the LCD 107 to the target chromaticity variation range # 701 (color correction 3) with respect to the chromaticity of the LED 201 having the chromaticity rank 3. The color of the image data is corrected so that it can be displayed as an image.

  On the other hand, in step ST508, when the level of the signal input to the input port 103c is low level “L” and the level of the signal input to the input port 103b is not high level “H”, the control unit 104 determines that the input port 103c 6 and the level of the signal input to the input port 103b are both determined as high level “H”, and the table of FIG. 6 is referred to. Thus, the control unit 104 determines that the chromaticity rank of the LED 201 is rank 4 when the level of the signal input to the input port 103c and the level of the signal input to the input port 103b are both high level “H”. The color correction 4 is selected to be performed.

  Next, the color correction unit 106 performs color correction of color correction 4 according to the control of the control unit 104 (step ST510).

  As shown in FIG. 7D, the color correction unit 106 performs color correction (color correction 4) on the image displayed on the LCD 107 to the target chromaticity variation range # 701 with respect to the chromaticity of the LED 201 of chromaticity rank 4. The color of the image data is corrected so that it can be displayed as an image.

  Further, the control unit 104 outputs a low level “L” signal from the output port of the input / output unit 103 after the processing of step ST505, step ST507, step ST509, or step ST510 is completed, so that the chromaticity of the LED 201 The identification of the rank and selection of color correction performed by the color correction unit 106 are terminated (step ST511). Thereafter, the color correction unit 106 performs color correction selected by the control unit 104 on all the images input from the image data generation unit 105 and outputs the images to the LCD 107.

  Here, the target chromaticity variation range can be set to an arbitrary range. However, it is preferable to set the target chromaticity variation range on the black body radiation locus. The color on the blackbody radiation locus looks natural white to the human eye, and the influence of green on the image increases from the blackbody radiation locus to the upper side of the chromaticity diagram. The effect of magenta on the image increases as it goes down from the chromaticity diagram. By setting the target chromaticity variation range on the black body radiation locus, the color tone of the image displayed on the portable electronic device 100 can be made natural.

  FIG. 9A to FIG. 9D are diagrams showing a method for correcting the color of an image within the target chromaticity variation range 1010 set on the blackbody radiation locus 1000. As shown in FIGS. 9A to 9D, the chromaticity variation due to the wavelength variation of the LED 201 and the phosphor covering the light emitting portion of the LED 201 is corrected by the shift amount (color correction) by the correction on the chromaticity diagram. The color correction unit 106 can correct the image color within the target chromaticity variation range 1010 on the black body radiation locus 1000 by controlling the direction and length of the arrows 1 to 4. The color correction methods in FIGS. 9A to 9D are the same as those in FIG. 5 except for the shift amount on the chromaticity diagram, and thus the description thereof is omitted.

  Here, the color correction method is not limited to correcting both the variation in the wavelength of the LED 201 and the variation in the phosphor covering the light emitting portion of the LED 201, but only the variation in the wavelength of the LED 201 or the fluorescence covering the light emitting portion of the LED 201. Only body variations may be corrected. In other words, the control unit 104 may perform control to perform shift correction only in the direction of the arrow 70 in FIG. 22 or only in the direction of the arrow 80 when performing color correction.

  FIGS. 10A and 10B are diagrams showing another color correction method according to this embodiment.

  As shown in FIGS. 10A and 10B, the control unit 104 may perform control to correct only the wavelength variation of the LED 201 and correct the color of the image. That is, the control unit 104 can perform color correction only in the wavelength variation direction 1120 of the LED 201 to bring the color of the image displayed on the LCD 107 closer to the target chromaticity variation range 1110 on the black body radiation locus 1100. At this time, as in color correction 1 and color correction 2 in FIGS. 10A and 10B, the control unit 104 shifts the chromaticity diagram together by grouping a plurality of chromaticity ranks together. It can be controlled to perform color correction. That is, as shown in FIG. 10A, the control unit 104 combines the chromaticity ranks 1 and 3 in FIG. 7 into one chromaticity rank 1 and sets the target chromaticity variation range 1110 on the black body radiation locus 1100. The color correction can be performed so that the color of the image displayed on the LCD 107 approaches. 10B, the chromaticity ranks 2 and 4 in FIG. 7 are combined into one chromaticity rank 2, and the target chromaticity variation range 1110 on the blackbody radiation locus 1100 is obtained. The color correction can be performed so that the color of the image displayed on the LCD 107 approaches.

  FIGS. 11A and 11B are diagrams showing still another color correction method in the present embodiment.

  As shown in FIGS. 11A and 11B, the control unit 104 may correct the color of the image by correcting only the variation in the phosphor of the LED. That is, the control unit 104 performs color correction only in the LED phosphor variation direction 1220 and performs color correction so that the chromaticity of the image displayed on the LCD 107 approaches the target chromaticity variation range 1210 on the black body radiation locus 1200. can do. At this time, as shown in FIG. 11 (a), the control unit 104 combines the chromaticity ranks 3 and 4 of FIG. 7 into one chromaticity rank 1, and the control unit 104 also sets the chromaticity ranks 3 and 4 in FIG. 11 (b). As shown in FIG. 7, the chromaticity ranks 1 and 2 in FIG. 7 are combined into one chromaticity rank 2 so that the color of the image displayed on the LCD 107 approaches the target chromaticity variation range 1210 on the black body radiation locus 1200. Color correction can be performed.

  Thus, according to the present embodiment, by correcting the color of the image displayed on the LCD according to the chromaticity of the light emitted from the LED, it is possible to meet the demand for higher image quality without increasing the cost. it can. Further, according to the present embodiment, when correcting only the wavelength variation of the LED or only the variation of the phosphor of the LED, the color is compared to the case of correcting both the wavelength variation of the LED and the variation of the phosphor. The circuit processing load accompanying the correction can be reduced. In addition, according to the present embodiment, since a circuit for identifying the rank of the chromaticity of the mounted LED is formed on the circuit board on which the LED is mounted, the color of the LED incorporated in the portable electronic device A rank identifying unit having a circuit configuration showing a rank different from the rank of the degree can be prevented from being erroneously mounted on the portable electronic device.

  In this embodiment, as described with reference to FIG. 8, the color correction is realized by appropriately limiting the output gradation for each input gradation of red (R), green (G), and blue (B). However, the present invention is not limited to this, and chromaticity correction may be realized by other methods. For example, RGB image signals may be converted into YUV space or HSV space, color correction may be performed in the space, and then returned to RGB.

(Embodiment 2)
FIG. 12 is a flowchart showing the color correction method according to the second embodiment of the present invention. In the present embodiment, the configuration of the portable electronic device is the same as that shown in FIG. In the description of FIG. 12, the description will be made using the reference numerals of FIGS.

  First, the LED power supply unit 101 is turned on when an LED power supply control signal is input (step ST1301).

  FIG. 13 is a diagram illustrating the configuration of the rank identifying unit 202 and the input / output unit 103. In the present embodiment, the input / output unit 103 is connected to the rank identifying unit 202 through one output port 103a and four input ports 103d to 103g. The output port 103a of the input / output unit 103 is connected to the rank identifying unit 202 via a signal line 1401, and the four input ports 103d to 103g of the input / output unit 103 are connected via signal lines 1402 to 1405. Each is connected to the rank identifying unit 202. The signal lines 1402 to 1405 are pulled down via resistors 1406 to 1409, respectively.

  The rank identifying unit 202 has one input terminal 202a and four output terminals 202d to 202g, and the input terminal 202a and the output terminal 202d are connected by an electric wiring 1401 formed by printing or the like. 202a and the output terminal 202e are connected by an electric wiring 1402 formed by printing or the like, and the input terminal 202a and the output terminal 202f are connected by an electric wiring 1403 formed by printing or the like, and the input terminal 202a The output terminal 202g is connected by an electrical wiring 1404 formed by printing or the like. The rank identifying unit 202 has a circuit configuration in which a resistor is connected in series to each of the electrical wirings 1401 to 1404 and a circuit configuration that is not connected in accordance with the chromaticity rank of the LED 201. In FIG. 13, the resistors R1 to R4 are appropriately unmounted according to the chromaticity rank of the LED.

  FIG. 14 is a diagram showing whether or not the resistors R1 to R4 of FIG. 13 are inserted for each chromaticity rank of the rank identifying unit 202.

  Returning to FIG. 12, next, the input / output unit 103 outputs a high level signal from the output port 103a to the planar light emitting device 102 via the signal line 1401 (H output) (step ST1302).

  Next, the control unit 104 supplies a signal input to the input port 103d of the input / output unit 103 via the signal line 1402, a signal input to the input port 103e of the input / output unit 103 via the signal line 1403, and the signal line 1404. The logic determination is performed based on the level of the signal input to the input port 103f of the input / output unit 103 via the signal and the level of the signal input to the input port 103g of the input / output unit 103 via the signal line 1405 (step ST1303).

  Next, the control unit 104 determines whether or not the levels of the signals input to the input ports 103d to 103g are all at the low level “L” (step ST1304).

  If both are at the low level, the control unit 104 refers to a table stored in advance. FIG. 15 is a diagram illustrating a table stored in the control unit 104. From FIG. 15, when all of the input ports 103 d to 103 g are at the low level, the control unit 104 selects that the chromaticity rank of the LED 201 is rank 1 and color correction 1 is performed.

  Next, the color correction unit 106 performs color correction 1 according to the control of the control unit 104 (step ST1305).

  Fig.16 (a)-FIG.16 (i) is a figure which shows the correction method of the color of an image.

  As shown in FIG. 16A, the color correction unit 106 displays the image displayed on the LCD 107 in the target chromaticity variation range # 1710 on the black body radiation locus 1700 with respect to the chromaticity of the LED 201 of chromaticity rank 1. The color of the image data is corrected so that it is displayed as a corrected image (color correction 1).

  On the other hand, in step ST1304, when none of the levels of the signals input to the input ports 103d to 103g are low level “L”, the control unit 104 determines that the level of the signal input to the input ports 103d to 103f is low level “L”. It is determined whether the level of the signal input to the input port 103g is the high level “H” (step ST1306).

  When the level of the signal input to the input port 103d to the input port 103f is low level “L” and the level of the signal input to the input port 103g is high level “H”, the control unit 104 displays the table in FIG. Refer to Accordingly, the control unit 104 determines the color of the LED 201 when the level of the signal input to the input ports 103d to 103f is low level “L” and the level of the signal input to the input port 103g is high level “H”. The rank of the degree is rank 2, and it is selected to perform color correction of color correction 2.

  Next, the color correction unit 106 performs color correction 2 according to the control of the control unit 104 (step ST1307).

  As shown in FIG. 16B, the color correcting unit 106 displays an image displayed on the LCD 107 in the target chromaticity variation range # 1710 on the black body radiation locus 1700 with respect to the chromaticity of the LED 201 with chromaticity rank 2. The color of the image data is corrected so that it is displayed as a corrected image (color correction 2).

  On the other hand, in step ST1306, when the level of the signal input to the input ports 103d to 103f is the low level “L” and the level of the signal input to the input port 103g is not the high level “H”, the control unit 104 It is determined whether the level of the signal input to 103d, 103e, and 103g is the low level “L” and the level of the signal input to the input port 103f is the high level “H” (step ST1308).

  When the level of the signal input to the input ports 103d, 103e, and 103g is low level “L” and the level of the signal input to the input port 103f is high level “H”, the control unit 104 displays the table in FIG. Refer to Accordingly, the control unit 104 determines that the LED 201 is in the case where the level of the signal input to the input ports 103d, 103e, and 103g is low level “L” and the level of the signal input to the input port 103f is high level “H”. The rank of chromaticity is rank 3, and it is selected to perform color correction 3 color correction.

  Next, the color correction unit 106 performs color correction of color correction 3 according to the control of the control unit 104 (step ST1309).

  As shown in FIG. 16C, the color correcting unit 106 displays the image displayed on the LCD 107 in the target chromaticity variation range # 1710 on the black body radiation locus 1700 with respect to the chromaticity of the LED 201 of chromaticity rank 3. The color of the image data is corrected so that it is displayed as a corrected image (color correction 3).

  On the other hand, in step ST1308, when the level of the signal input to the input ports 103d, 103e, and 103g is low level “L” and the level of the signal input to the input port 103f is not high level “H”, the control unit 104 It is determined whether or not the level of the signal input to the input ports 103d and 103e is low level “L” and the level of the signal input to the input ports 103f and 103g is high level “H” (step ST1310).

  When the level of the signal input to the input ports 103d and 103e is low level “L” and the level of the signal input to the input ports 103f and 103g is high level “H”, the control unit 104 displays the table in FIG. Refer to Accordingly, the control unit 104 determines that the LED 201 is in the case where the level of the signal input to the input ports 103d and 103e is the low level “L” and the level of the signal input to the input ports 103f and 103g is the high level “H”. The rank of the chromaticity is rank 4, and it is selected to perform color correction of color correction 4.

  Next, the color correction unit 106 performs color correction of color correction 4 according to the control of the control unit 104 (step ST1311).

  As shown in FIG. 16D, the color correcting unit 106 displays an image displayed on the LCD 107 in the target chromaticity variation range # 1710 on the black body radiation locus 1700 with respect to the chromaticity of the LED 201 of chromaticity rank 4. The color of the image data is corrected so that it is displayed as a corrected image (color correction 4).

  On the other hand, in step ST1310, when the level of the signal input to the input ports 103d and 103e is low level “L” and the level of the signal input to the input ports 103f and 103g is not high level “H”, the control unit 104 It is determined whether the level of the signal input to the input ports 103d, 103f, and 103g is low level “L” and the level of the signal input to the input port 103e is high level “H” (step ST1312).

  When the level of the signal input to the input ports 103d, 103f, and 103g is low level “L” and the level of the signal input to the input port 103e is high level “H”, the control unit 104 displays the table in FIG. refer. Accordingly, the control unit 104 determines that the LED 201 is in the case where the level of the signal input to the input ports 103d, 103f, and 103g is low level “L” and the level of the signal input to the input port 103e is high level “H”. The rank of the chromaticity is rank 5, and it is selected to perform color correction of color correction 5.

  Next, the color correction unit 106 performs color correction of color correction 5 according to the control of the control unit 104 (step ST1313).

  As shown in FIG. 16E, the color correcting unit 106 displays the image displayed on the LCD 107 in the target chromaticity variation range # 1710 on the black body radiation locus 1700 with respect to the chromaticity of the LED 201 of chromaticity rank 5. The color of the image data is corrected so that it is displayed as a corrected image (color correction 5).

  On the other hand, in step ST1312, when the level of the signal input to the input ports 103d, 103f, and 103g is low level “L” and the level of the signal input to the input port 103e is not high level “H”, the control unit 104 It is determined whether the level of the signal input to the input ports 103d and 103f is low level “L” and the level of the signal input to the input ports 103103e and 103g is high level “H” (step ST1314).

  When the level of the signal input to the input ports 103d and 103f is low level “L” and the level of the signal input to the input ports 103e and 103g is high level “H”, the control unit 104 displays the table in FIG. refer. Accordingly, the control unit 104 determines that the LED 201 is in the case where the level of the signal input to the input ports 103d and 103f is the low level “L” and the level of the signal input to the input ports 103e and 103g is the high level “H”. The rank of chromaticity is rank 6, and it is selected to perform color correction of color correction 6.

  Next, the color correction unit 106 performs color correction 6 according to the control of the control unit 104 (step ST1315).

  As shown in FIG. 16F, the color correcting unit 106 displays the image displayed on the LCD 107 in the target chromaticity variation range # 1710 on the blackbody radiation locus 1700 with respect to the chromaticity of the LED 201 having the chromaticity rank 6. The color of the image data is corrected so that it is displayed as a corrected image (color correction 6).

  On the other hand, in step ST1314, when the level of the signal input to the input ports 103d and 103f is the low level “L” and the level of the signal input to the input ports 103e and 103g is not the high level “H”, the control unit 104 It is determined whether the level of the signal input to the input ports 103d and 102g is low level “L” and the level of the signal input to the input ports 103e and 103f is high level “H” (step ST1316).

  When the level of the signal input to the input ports 103d and 103g is the low level “L” and the level of the signal input to the input ports 103e and 103f is the high level “H”, the control unit 104 displays the table of FIG. refer. Accordingly, the control unit 104 determines that the LED 201 is in the case where the level of the signal input to the input ports 103d and 103g is low level “L” and the level of the signal input to the input ports 103e and 103f is high level “H”. The rank of the chromaticity is rank 7, and it is selected to perform color correction of color correction 7.

  Next, the color correction unit 106 performs color correction of color correction 7 under the control of the control unit 104 (step ST1317).

  As shown in FIG. 16G, the color correcting unit 106 displays the image displayed on the LCD 107 in the target chromaticity variation range # 1710 on the black body radiation locus 1700 with respect to the chromaticity of the LED 201 having the chromaticity rank 7. The color of the image data is corrected so that it is displayed as a corrected image (color correction 7).

  On the other hand, in step ST1316, when the level of the signal input to the input ports 103d and 103g is low level “L” and the level of the signal input to the input ports 103e and 103f is not high level “H”, the control unit 104 It is determined whether or not the level of the signal input to the input port 103d is the low level “L” and the level of the signal input to the input ports 103e to 103g is the high level “H” (step ST1318).

  When the level of the signal input to the input port 103d is the low level “L” and the level of the signal input to the input ports 103e to 103g is the high level “H”, the control unit 104 refers to the table of FIG. . Accordingly, the control unit 104 determines the color of the LED 201 when the level of the signal input to the input port 103d is the low level “L” and the level of the signal input to the input ports 103e to 103g is the high level “H”. The rank of the degree is rank 8, and it is selected to perform color correction 8 color correction.

  Next, the color correction unit 106 performs color correction 8 according to the control of the control unit 104 (step ST1319).

  From FIG. 16H, the color correcting unit 106 displays the image displayed on the LCD 107 in the target chromaticity variation range # 1710 on the black body radiation locus 1700 with respect to the chromaticity of the LED 201 having the chromaticity rank 8. The color of the image data is corrected so that it is displayed as a corrected image (color correction 8).

  On the other hand, in step ST1318, when the level of the signal input to the input port 103d is low level “L” and the level of the signal input to the input ports 103e to 103g is not high level “H”, the control unit 104 The chromaticity rank is rank 9, and it is selected to perform color correction 9 color correction.

  Next, the color correction unit 106 performs color correction 9 according to the control of the control unit 104 (step ST1320).

  As shown in FIG. 16I, the color correcting unit 106 displays the image displayed on the LCD 107 in the target chromaticity variation range # 1710 on the black body radiation locus 1700 with respect to the chromaticity of the LED 201 having the chromaticity rank 9. The color of the image data is corrected so that it is displayed as a corrected image (color correction 9). In the case of the color correction 9, all the resistors R1 to R4 are mounted in the table of FIG. 14, but the present invention is not limited to this, and the resistors R1 to R4 are mounted in the chromaticity ranks 1 to 8. If it is different from the unmounted state, it can be in any state. For example, in the case of chromaticity rank 9, the resistors R1 to R3 may be mounted and the resistor R4 may not be mounted in the circuit configuration of the rank identifying unit 202 and the table of FIG.

  Further, after the processing of step ST1305, step ST1307, step ST1309, step ST1311, step ST1313, step ST1315, step ST1317, step ST1319, and step ST1320 is completed, a low level “L” signal is output from the output port of the input / output unit 103. Is output, the process of identifying the chromaticity rank of the LED 201 and selecting the color correction performed by the color correction unit 106 is completed (step ST1321). Thereafter, the color correction unit 106 performs color correction selected by the control unit 104 on all the images input from the image data generation unit 105 and outputs the images to the LCD 107.

  Note that the color corrections 1 to 9 are not limited to correction to the target chromaticity variation range on the black body radiation locus as shown in FIG. 16, but can be corrected to an arbitrarily set target chromaticity variation range.

  FIG. 17 is a diagram illustrating another color correction method according to the present embodiment.

  When performing color correction 1, as shown in FIG. 17A, the control unit 104 collects four ranks out of the nine ranks and sets a target chromaticity variation range # on the blackbody radiation locus 1700. It is corrected to 1710. When performing color correction 2, as shown in FIG. 17B, the control unit 104 collects two ranks out of the nine ranks, and changes the target chromaticity variation on the blackbody radiation locus 1700. Correction to range # 1717. When performing color correction 3, as shown in FIG. 17 (c), the control unit 104 collects two ranks out of the nine ranks, and changes the target chromaticity variation on the blackbody radiation locus 1700. Correction to range # 1710. Further, when performing color correction 4, the control unit 104, as shown in FIG. 17D, has a chromaticity variation range # that targets only one rank among the nine ranks on the blackbody radiation locus 1700. It is corrected to 1710. In the case of FIG. 17, since four types of color correction are sufficient, the table stored in the control unit 104 can be the same as that in FIG.

  Thus, according to the present embodiment, by correcting the color of the image displayed on the LCD according to the chromaticity of the light emitted from the LED, it is possible to meet the demand for higher image quality without increasing the cost. it can. In addition, according to the present embodiment, since a circuit for identifying the rank of the chromaticity of the mounted LED is formed on the circuit board on which the LED is mounted, the color of the LED incorporated in the portable electronic device A rank identifying unit having a circuit configuration showing a rank different from the rank of the degree can be prevented from being erroneously mounted on the portable electronic device. In addition, according to the present embodiment, the chromaticity of the LEDs having the nine chromaticity ranks is corrected. Therefore, compared with the first embodiment, since the LEDs having a wide chromaticity range are used, the cost and procurement of the LEDs are increased. The ease of operation can be improved, and at the same time, the quality of the entire product can be improved. Further, since the color of the image can be finely corrected, the display quality can be improved.

(Embodiment 3)
18 (a) to 18 (d) are diagrams showing rank identifying units 202 having different circuit configurations for each rank of LED 201 according to Embodiment 3 of the present invention. 18 (a) to 18 (d), the same reference numerals are given to the same components as those in FIGS. 3 (a) to 3 (d), and the description thereof is omitted. Further, the configuration of the portable electronic device is the same as that shown in FIG. 1, and the color correction method is the same as that shown in FIG.

  FIG. 18A to FIG. 18D show, for example, a case where the LEDs 201 having four ranks a2, a3, b2, and b3 in FIG. 22 are used.

  From FIG. 18A to FIG. 18D, the rank identifying unit 202 has one input terminal 202a and two output terminals 202h and 202i. In the rank identifying unit 202, the input terminal 202a and the output terminal 202h are connected by an electrical wiring 1902 formed by printing or the like, and the input terminal 202a and the output terminal 202i are formed by printing or the like. They are connected by electrical wiring 1901. The rank identifying unit 202 has a circuit configuration in which through holes are formed in the electric wirings 1901 and 1902 and a circuit configuration in which the through holes are not formed in accordance with the chromaticity rank of the LED 201.

  That is, in FIG. 18A, the rank identifying unit 202 includes a through hole 1951 that electrically disconnects the electrical wirings 1901 and 1902 in both the first path 1910 of the electrical wiring 1901 and the second path 1911 of the electrical wiring 1902. 1952 are formed. Therefore, when a high level “1” signal is input from the output port of the input / output unit 103 to the input terminal 202a of the rank identifying unit 202 via the signal line 121, any of the input ports 103b and 103c of the input / output unit 103 is selected. Since no signal is input, the control unit 104 detects a low level “0”.

  In FIG. 18B, the rank identifying unit 202 does not have a through hole that electrically disconnects the electrical wiring 1901 in the first path 1910 of the electrical wiring 1901, and the second path of the electrical wiring 1902. A through hole 1952 for electrically disconnecting the electrical wiring 1902 is formed in 1911. Accordingly, when a high level “1” signal is input from the output port of the input / output unit 103 to the input terminal 202a of the rank identifying unit 202 via the signal line 121, the input / output is performed from the output terminal 202i via the signal line 122. The level of the signal input to the input port 103 c of the unit 103 is detected as a high level “1” signal in the control unit 104, and no signal is input to the input port 103 b of the input / output unit 103. In, a low level “0” is detected.

  In FIG. 18C, the rank identifying unit 202 includes a through hole 1951 that electrically disconnects the electrical wiring 1901 in the first path 1910 of the electrical wiring 1901, and the second path of the electrical wiring 1902. A through hole for electrically disconnecting the electrical wiring 1902 is not formed in 1911. Therefore, when a high level “1” signal is input from the output port of the input / output unit 103 to the input terminal 202a of the rank identifying unit 202 via the signal line 121, a signal is input to the input port 103c of the input / output unit 103. Since no input is made, the control unit 104 detects the low level “0”, and the level of the signal input from the output terminal 202 h to the input port 103 b of the input / output unit 103 via the signal line 123 is , Detected as a high level “1” signal.

  In FIG. 18D, the rank identifying unit 202 has through holes that electrically disconnect the electrical wirings 1901 and 1902 in both the first path 1910 of the electrical wiring 1901 and the second path 1911 of the electrical wiring 1902. Not formed. Accordingly, when a high level “1” signal is input from the output port of the input / output unit 103 to the input terminal 202a of the rank identifying unit 202 via the signal line 121, the input / output is performed from the output terminal 202i via the signal line 122. The level of the signal input to the input port 103 c of the unit 103 and the signal input from the output terminal 202 h to the input port 103 b of the input / output unit 103 via the signal line 123 are both high level “1” in the control unit 104. ”Is detected.

  Thus, according to the present embodiment, by correcting the color of the image displayed on the LCD according to the chromaticity of the light emitted from the LED, it is possible to meet the demand for higher image quality without increasing the cost. it can. In addition, according to the present embodiment, since a circuit for identifying the rank of the chromaticity of the mounted LED is formed on the circuit board on which the LED is mounted, the color of the LED incorporated in the portable electronic device A rank identifying unit having a circuit configuration showing a rank different from the rank of the degree can be prevented from being erroneously mounted on the portable electronic device. Further, according to the present embodiment, when correcting only the wavelength variation of the LED or only the phosphor variation of the LED, the color correction is performed as compared with the case of correcting both the LED wavelength variation and the phosphor variation. It is possible to reduce the circuit processing load associated with. In addition, according to the present embodiment, the rank of the chromaticity of the LED is determined with a simple circuit configuration by identifying the rank of the chromaticity of the LED using a circuit having a different circuit configuration by forming a through hole. Since it can identify, while being able to manufacture easily, manufacturing cost can be reduced.

  In the fatigue 3 of the present embodiment, the circuit pattern is electrically disconnected by the through hole. However, the present invention is not limited to this, and any method can be used as long as the circuit pattern can be electrically disconnected.

(Embodiment 4)
FIG. 19A to FIG. 19D are diagrams showing rank identifying units 202 having different circuit configurations for each rank of LED 201 according to Embodiment 4 of the present invention. 19 (a) to 19 (d), parts having the same configurations as those in FIGS. 3 (a) to 3 (d) are denoted by the same reference numerals and description thereof is omitted. Further, the configuration of the portable electronic device is the same as that shown in FIG. 1, and the color correction method is the same as that shown in FIG.

  FIG. 19A to FIG. 19D show, for example, a case where the LEDs 201 having four ranks a2, a3, b2, and b3 in FIG. 22 are used.

  From FIG. 19A to FIG. 19D, the rank identifying unit 202 has one input terminal 202a and two output terminals 202j and 202k. In the rank identifying unit 202, the input terminal 202a and the output terminal 202k are connected by an electric wiring 2001 formed by printing or the like, and the input terminal 202a and the output terminal 202j are formed by printing or the like. They are connected by electrical wiring 2002. The rank identifying unit 202 has a circuit configuration in which the electrical wirings 2001 and 2002 are formed and a circuit configuration in which the electrical wirings 2001 and 2002 are not formed in accordance with the chromaticity rank of the LED 201.

  That is, in FIG. 19A, the rank identifying unit 202 has no electrical wiring formed. Accordingly, when a high level “1” signal is input from the output port of the input / output unit 103 to the input terminal 202a of the rank identifying unit 202 via the signal line 121, the input port 103c and the input port 103b of the input / output unit 103 are input. Since no signal is input to the control unit 104, the low level “0” is detected by the control unit 104.

  In FIG. 19B, the rank identifying unit 202 is formed with an electrical wiring 2001 that short-circuits the signal line 121 and the signal line 122. Accordingly, when a high level “1” signal is input from the output port of the input / output unit 103 to the input terminal 202a of the rank identifying unit 202 via the signal line 121, the input / output is performed from the output terminal 202k via the signal line 122. When a signal is input to the input port 103 c of the unit 103, a high level “1” is detected in the control unit 104, and no signal is input to the input port 103 b of the input / output unit 103. The low level “0” is detected.

  In FIG. 19C, the rank identifying unit 202 is formed with an electrical wiring 2002 that short-circuits the signal line 121 and the signal line 123. Therefore, when a high level “1” signal is input from the output port of the input / output unit 103 to the input terminal 202a of the rank identifying unit 202 via the signal line 121, a signal is input to the input port 103c of the input / output unit 103. Since no signal is input, the control unit 104 detects a low level “0” signal and inputs a signal from the output terminal 202 j to the input port 103 b of the input / output unit 103 via the signal line 123. In, a high level “1” signal is detected.

  In FIG. 19D, the rank identifying unit 202 includes an electrical wiring 2001 that short-circuits the signal line 121 and the signal line 122, and an electrical wiring 2002 that short-circuits the signal line 121 and the signal line 123. . Accordingly, when a high level “1” signal is input from the output port of the input / output unit 103 to the input terminal 202a of the rank identifying unit 202 via the signal line 121, the input / output is performed from the output terminal 202k via the signal line 122. When the signal is input to the unit 103 and the signal is input from the output terminal 202j to the input port 103b of the input / output unit 103 via the signal line 123, the control unit 104 detects a high level “1”. Is done.

  Thus, according to the present embodiment, by correcting the color of the image displayed on the LCD according to the chromaticity of the light emitted from the LED, it is possible to meet the demand for higher image quality without increasing the cost. it can. In addition, according to the present embodiment, since a circuit for identifying the rank of the chromaticity of the mounted LED is formed on the circuit board on which the LED is mounted, the color of the LED incorporated in the portable electronic device A rank identifying unit having a circuit configuration showing a rank different from the rank of the degree can be prevented from being erroneously mounted on the portable electronic device. Further, according to the present embodiment, when correcting only the wavelength variation of the LED or only the variation of the phosphor of the LED, the color is compared to the case of correcting both the wavelength variation of the LED and the variation of the phosphor. The circuit processing load accompanying the correction can be reduced.

  The portable electronic device according to the present invention is particularly suitable for reducing variation in chromaticity of light emitted from a white light emitting diode mounted on a backlight.

1 is a block diagram showing a configuration of a portable electronic device according to Embodiment 1 of the present invention. The figure which shows the structure of the planar light-emitting device and input-output part which concern on Embodiment 1 of this invention. The figure which shows the structure of the rank identification part which concerns on Embodiment 1 of this invention. The figure which shows the presence or absence of the resistance for every chromaticity rank of the rank identification part which concerns on Embodiment 1 of this invention. FIG. 3 is a flowchart showing a color correction method according to the first embodiment of the present invention. The figure which shows the table which concerns on Embodiment 1 of this invention. The figure which shows the color correction method which concerns on Embodiment 1 of this invention. The figure which shows the color correction method which concerns on Embodiment 1 of this invention. The figure which shows the color correction method which concerns on Embodiment 1 of this invention. The figure which shows the color correction method which concerns on Embodiment 1 of this invention. The figure which shows the color correction method which concerns on Embodiment 1 of this invention. FIG. 7 is a flowchart showing a color correction method according to Embodiment 2 of the present invention. The figure which shows the structure of the rank identification part and input / output part which concerns on Embodiment 2 of this invention. The figure which shows the presence or absence of the resistance for every rank of the chromaticity of the rank identification part which concerns on Embodiment 2 of this invention. The figure which shows the table which concerns on Embodiment 2 of this invention. The figure which shows the color correction method which concerns on Embodiment 2 of this invention. The figure which shows the color correction method which concerns on Embodiment 2 of this invention. The figure which shows the structure of the rank identification part which concerns on Embodiment 3 of this invention. The figure which shows the structure of the rank identification part which concerns on Embodiment 4 of this invention. Front view of a conventional LCD Plan view of a conventional LCD The figure which shows the rank of the chromaticity of LED according to chromaticity

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Portable electronic device 101 LED power supply part 102 Planar light-emitting device 103 Input / output part 104 Control part 105 Image data generation part 106 Color correction part 107 LCD
110 Control unit 121, 122, 123 Signal line

Claims (9)

  1. Display means for displaying an image on a liquid crystal display surface;
    A backlight for illuminating the liquid crystal display surface from the back by a white light emitting diode;
    Identifying means for identifying the chromaticity of the white light emitting diode;
    Color correcting means for correcting the color of the image based on the chromaticity identified by the identifying means;
    A portable electronic device comprising:
  2. Comprising holding means for holding different circuit configurations according to the chromaticity of the light emitted by the white light emitting diode;
    The identification unit detects a difference in level of a signal output from the holding unit caused by a difference in the circuit configuration when a signal of a predetermined level is supplied to the holding unit, and the white light emission The portable electronic device according to claim 1, wherein the chromaticity of the diode is identified.
  3. The holding means has one input unit and at least one output unit, and has a circuit configuration that differs depending on the presence or absence of a resistor connected in series to an electrical wiring connecting the input unit and the output unit,
    The portable electronic device according to claim 2, wherein the identification unit supplies a signal of a predetermined level to the input unit and detects a difference in level of the signal output from the output unit.
  4. The holding means has one input unit and at least one output unit, and has a different circuit configuration depending on the presence or absence of electrical disconnection of the electrical wiring connecting the input unit and the output unit,
    The portable electronic device according to claim 2, wherein the identification unit supplies a signal of a predetermined level to the input unit and detects a difference in level of the signal output from the output unit.
  5. The holding means has one input unit and at least one output unit, and has a different circuit configuration depending on the presence or absence of electrical wiring that connects the input unit and the output unit,
    The portable electronic device according to claim 2, wherein the identification unit supplies a signal of a predetermined level to the input unit and detects a difference in level of the signal output from the output unit.
  6.   The portable electronic device according to any one of claims 2 to 5, wherein the holding unit forms an electrical wiring having the different circuit configuration on a substrate on which the white light emitting diode is mounted.
  7. The holding means has a different circuit configuration for each predetermined region on a chromaticity diagram to which the chromaticity of light emitted by the white light emitting diode belongs,
    The portable electronic device according to claim 2, wherein the identification unit identifies the region as the chromaticity identification.
  8. The backlight illuminates the liquid crystal display surface from the back by the white light emitting diode formed by covering the light emitting portion of the blue light emitting diode with yellow phosphor or green and red phosphor,
    The portable electronic device according to any one of claims 1 to 7, wherein the color correction unit corrects only a wavelength variation of the blue light emitting diode as a correction of the color of the image.
  9. The backlight illuminates the liquid crystal display surface from the back by the white light emitting diode formed by covering the light emitting portion of the blue light emitting diode with yellow phosphor or green and red phosphor,
    The portable electronic device according to claim 1, wherein the color correction unit corrects only the variation of the phosphor as the color correction of the image.
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