JP2008292891A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display a video of excellent quality even when irradiated with outside light. <P>SOLUTION: A CPU 34 of a color liquid crystal display device is provided with: an opening control part 345 for controlling an opening for every pixel of a liquid crystal display panel; a light emission control part 344 for controlling light quantities of emission light of a first prescribed number of LEDs 21 disposed in a backlight light source; an outside light detecting part 342 for detecting an light quantity of the outside light emitted from an external part via the liquid crystal display panel; and a correction value computing part 343 for computing correcting values correcting light quantities of emission light of the first prescribed number of LEDs 21 and the opening degrees of the liquid crystal display panel based on the light quantity of the external light detected by the external light detecting part 342 via the opening control part 345 and the light emission control part 344. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes a liquid crystal display panel configured to be able to control the opening degree by controlling the alignment direction of liquid crystal for each pixel, and a plurality of LEDs arranged in a grid pattern. The present invention relates to a liquid crystal display device including a backlight light source for irradiation. In particular, a liquid crystal display that includes R (Red), G (Green), and B (Blue) color filters for each pixel, and is configured to control the opening corresponding to each color filter of each pixel. The present invention relates to a color liquid crystal display device having a panel.

  Conventionally, a liquid crystal display panel configured to be able to control the opening degree by controlling the orientation direction of liquid crystal for each pixel and a plurality of LEDs arranged in a grid pattern are irradiated from the back side. A liquid crystal display device including a backlight light source has been proposed. In such a liquid crystal display device, there are cases where the luminance values between the plurality of LEDs are different and a desired luminance cannot be obtained visually.

In order to solve the above problems, various apparatuses, methods, and the like have been proposed. For example, a liquid crystal display device is disclosed in which a part of a plurality of LEDs arranged in a backlight light source are sequentially turned off, and the amount of emitted light for each LED is controlled from fluctuation information of the amount of light detected by a photosensor unit. (See Patent Document 1).
JP-A-2005-208486

  However, in a conventional liquid crystal display device such as the above-described liquid crystal display device, when the liquid crystal display panel is irradiated with external light, the quality of the image visually recognized by the user may not be sufficient. That is, when the liquid crystal display panel is unevenly irradiated with external light, the portion where the amount of external light is large darkens the image visually recognized by the user, and conversely, the portion where the amount of external light is small is Since the image visually recognized by the user becomes brighter, the quality of the image is lowered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device capable of displaying a video of good quality even when external light is irradiated.

  In order to achieve the above object, a liquid crystal display device according to claim 1 is arranged in a grid pattern with a liquid crystal display panel configured to control the opening degree by controlling the alignment direction of the liquid crystal for each pixel. A liquid crystal display device having a backlight source that has two or more first predetermined number of LEDs and irradiates the liquid crystal display panel from the back side, and controls the opening degree of each pixel of the liquid crystal display panel A control means, a light emission control means for controlling the light emission quantity of a first predetermined number of LEDs disposed in the backlight light source, and a light quantity of external light emitted from the outside via the liquid crystal display panel are detected. Based on the amount of external light detected by the external light detection means via the external light detection means and at least one of the liquid crystal control means and the light emission control means, the light emission quantity of the first predetermined number of LEDs, and Said liquid It is characterized in that it comprises opening the display panel, and a correction means for correcting at least one of, a.

  The liquid crystal display device according to claim 2 is the liquid crystal display device according to claim 1, wherein the external light detection means controls the liquid crystal control means to maximize the opening, and the light emission. The control means is controlled to stop the light emission of the first predetermined number of LEDs, and the amount of external light emitted from the outside is detected.

  A liquid crystal display device according to a third aspect is the liquid crystal display device according to the first or second aspect, wherein the external light detecting means includes two or more second predetermined number of CMOSs arranged in a lattice pattern. (Complementary Metal Oxide Semiconductor) An image sensor is provided, and the amount of external light irradiated from the outside is detected through the second predetermined number of CMOS image sensors.

  The liquid crystal display device according to claim 4 is the liquid crystal display device according to claim 3, wherein the correction unit is configured to reduce the amount of light detected by the second predetermined number of CMOS image sensors of the external light detection unit. Of the second predetermined number of CMOS image sensors, a light amount difference with respect to the amount of external light detected by a reference image sensor disposed at a predetermined position is obtained, and the first light amount difference is determined based on the obtained light amount difference. It is characterized in that at least one of the light emission quantity of one predetermined number of LEDs and the opening of the liquid crystal display panel is corrected.

  The liquid crystal display device according to claim 5 is the liquid crystal display device according to claim 3 or 4, wherein the liquid crystal display panel has an R (Red) color, a G (Green) color, and a pixel for each pixel. , A B (Blue) color filter, and an opening degree corresponding to each color filter of each pixel is configured to be controllable, and the outside light detection means is connected to the second predetermined number of CMOS image sensors, A luminance component, an R color component, a G color component, and a B color component of external light are detected, and the correction unit detects the first predetermined predetermined value based on the luminance component of the external light detected by the external light detection unit. Of the liquid crystal display panel corresponding to the corresponding color filter based on the R color component, G color component, and B color component of the external light detected by the external light detection means. Characterized by correcting the opening It is.

  A liquid crystal display device according to a sixth aspect is the liquid crystal display device according to any one of the third to fifth aspects, wherein the first predetermined number and the second predetermined number are the number of pixels of the liquid crystal display panel. And approximately the same number.

  According to the liquid crystal display device of claim 1, the opening degree is controlled for each pixel of the liquid crystal display panel by the liquid crystal control means, and the first predetermined number of LEDs disposed in the backlight light source by the light emission control means. The amount of emitted light is controlled. Then, the amount of external light emitted from the outside is detected via the liquid crystal display panel, and based on the detected amount of external light, the first predetermined number is transmitted via at least one of the liquid crystal control means and the light emission control means. Since at least one of the light emission amount of the LED and the opening of the liquid crystal display panel is corrected, an image with good quality can be displayed even when external light is irradiated.

  That is, the amount of external light emitted from the outside is detected via the liquid crystal display panel, and the light emission amount of the first predetermined number of LEDs and the opening of the liquid crystal display panel based on the detected amount of external light For example, when the amount of external light is large, the external light can be corrected by controlling to increase the light emission amount of the LED at the corresponding position. Even when light is irradiated, an image of good quality can be displayed.

  According to the liquid crystal display device of the second aspect, the opening degree is controlled to be maximized through the liquid crystal control means, and controlled to stop the light emission of the first predetermined number of LEDs through the light emission control means. Since the amount of external light emitted from the outside is detected, the amount of external light emitted from the outside can be accurately detected.

  That is, the opening degree is controlled through the liquid crystal control means to be maximized, and the light emission control means is controlled to stop the light emission of the first predetermined number of LEDs, and the amount of external light emitted from the outside is detected. Therefore, the amount of external light is detected under the condition that the amount of external light transmitted through the liquid crystal control means is maximized without receiving the light emitted from the first predetermined number of LEDs. The amount of external light emitted from the outside can be accurately detected.

  According to the liquid crystal display device of the third aspect, since the amount of external light emitted from the outside is detected through the second predetermined number of CMOS image sensors that are arranged in a lattice pattern, the external light amount is detected from the outside. The amount of external light irradiated can be detected more accurately.

  That is, since the amount of external light irradiated from the outside through two or more second predetermined number of CMOS image sensors arranged in a grid pattern is detected, the external light irradiated on the liquid crystal display panel is not uniform. In some cases, the distribution of the amount of external light applied to the liquid crystal display panel can be detected, so that the amount of external light applied from the outside can be detected more accurately.

  According to the liquid crystal display device of claim 4, the light quantity detected by the second predetermined number of CMOS image sensors is disposed at a predetermined position set in advance among the second predetermined number of CMOS image sensors. A light amount difference with respect to the amount of external light detected by the reference image sensor is obtained, and at least one of the light emission amount of the first predetermined number of LEDs and the opening of the liquid crystal display panel is corrected based on the obtained light amount difference. Therefore, even when external light is irradiated, an image with good quality can be easily displayed.

  That is, the amount of external light detected by the reference image sensor disposed at a predetermined position among the second predetermined number of CMOS image sensors, the amount of light detected by the second predetermined number of CMOS image sensors. A light amount difference is obtained, and at least one of the light emission amount of the first predetermined number of LEDs and the opening of the liquid crystal display panel is corrected based on the obtained light amount difference, so that the liquid crystal display panel is irradiated. Even when the external light is not uniform, the correction corresponding to the distribution of the amount of external light applied to the liquid crystal display panel can be easily performed, so that the quality is good even when external light is applied. This video can be easily displayed.

  According to the liquid crystal display device of claim 5, the liquid crystal display panel includes color filters of R color, G color, and B color for each pixel, and controls the opening corresponding to each color filter of each pixel. It is configured to be possible. Then, the luminance component, the R color component, the G color component, and the B color component of the external light are detected via the second predetermined number of CMOS image sensors, and based on the detected luminance component of the external light, 1 The light emission quantity of a predetermined number of LEDs is corrected, and the opening degree of the liquid crystal display panel corresponding to the corresponding color filter is corrected based on the detected R color component, G color component and B color component of the external light. Therefore, even when external light is irradiated, an image with better quality can be displayed.

  That is, the luminance component, R color component, G color component, and B color component of the external light are detected via the second predetermined number of CMOS image sensors, and the first luminance component of the external light is detected based on the detected luminance component of the external light. 1 The light emission quantity of a predetermined number of LEDs is corrected, and the opening degree of the liquid crystal display panel corresponding to the corresponding color filter is corrected based on the detected R color component, G color component and B color component of the external light. Therefore, even when the external light applied to the liquid crystal display panel is not white light (= colored light), the correction corresponding to the external light applied to the liquid crystal display panel can be accurately performed. Even when external light is irradiated, a better quality image can be displayed.

  According to the liquid crystal display device of the sixth aspect, the first predetermined number that is the number of LEDs disposed in the backlight light source and the second predetermined number that is the number of CMOS image sensors that detect external light are liquid crystal. Since the number of pixels is approximately the same as the number of pixels of the display panel, even better quality images can be displayed even when external light is irradiated.

  That is, the first predetermined number that is the number of LEDs disposed in the backlight light source and the second predetermined number that is the number of CMOS image sensors that detect external light are substantially the same as the number of pixels of the liquid crystal display panel. Therefore, the correction corresponding to the external light can be accurately performed for each pixel, and thus even better quality images can be displayed even when the external light is irradiated.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of the configuration of a color liquid crystal display device according to the present invention. The color liquid crystal display device 100 includes a liquid crystal display panel 1 and a backlight light source 2 disposed on the back side (the lower side in the figure) of the liquid crystal display panel 1. The backlight light source 2 irradiates the liquid crystal display panel 1 from the back side (the lower side in the figure), and is a first predetermined number of two or more (here, pixels of the liquid crystal display panel 1) arranged in a grid pattern. The number of LEDs 21 (see FIG. 2) is the same.

  The liquid crystal display panel 1 can control the degree of opening with respect to the light beam from the backlight source 2 (= the amount of light transmitted through the liquid crystal display panel 1 / the amount of light received by the liquid crystal display panel 1) by controlling the alignment direction of the liquid crystal for each pixel. A pair of electrode substrates 11 and 12, a liquid crystal layer 13 sealed between the electrode substrates 11 and 12, a color filter 14 attached to the electrode substrate 12, and a liquid crystal of the electrode substrates 11 and 12. A pair of polarizing plates 15 and 16 are provided on the side away from the layer 13.

  The electrode substrate 11 is a TFT (Thin Film Transistor) substrate, and includes a thin film transistor 111, scanning lines 112 arranged in a matrix, and signal lines 113. The electrode substrate 12 includes a counter electrode 121 on the liquid crystal layer 13 side, and a color filter 14 is attached thereto. The color filter 14 converts white light emitted from the backlight light source 2 into R (Red) color light, G (Green) color light, and B (Blue) color light. A color image is displayed.

  The polarizing plates 15 and 16 transmit only light (polarized light) having an amplitude component in a specific direction, and one is configured to transmit vertical polarized light and the other is configured to transmit horizontal polarized light. A voltage is applied between the electrode substrates 11 and 12 via an X driver 31 and a Y driver 32 which will be described later with reference to FIG. 3, and the liquid crystal sealed in the liquid crystal layer 13 is aligned to irradiate from the backlight light source 2. The amount of light transmitted through the polarizing plates 15 and 16 is controlled.

  FIG. 2 is a perspective view showing an example of the backlight light source 2. The backlight light source 2 includes a first predetermined number (here, the same number as the number of pixels of the liquid crystal display panel 1) of LEDs 21 and a second predetermined number (here, the same number as the number of pixels of the liquid crystal display panel 1). A pair of CMOS image sensors 22 are arranged in a grid pattern.

  The LED (Light Emitting Diode) 21 is supplied with a current via the LED driver 33 shown in FIG. 3 and irradiates the liquid crystal display panel 1 with light rays (= backlight). A CMOS (Complementary Metal Oxide Semiconductor) image sensor 22 (corresponding to a part of the external light detection means) detects the amount of external light emitted from the outside via the liquid crystal display panel 1. 3 outputs a luminance component (Y), R color component, G color component, and B color component of the received external light to the CPU 34 shown in FIG.

  A row number i (i = 1 to M, for example, M = 720) and a column number j (j = 1 to N, for example, N = 1280) are attached to each CMOS image sensor 22 as shown in FIG. Each CMOS image sensor 22 is distinguished. Further, in the following description, the outputs from the CMOS image sensors 22 are similarly distinguished by attaching row numbers i and column numbers j. For example, the luminance component, R color component, G color component, and B color component of the external light detected by the CMOS image sensor 22 corresponding to the row number i and the column number j are respectively represented as Yij, Rij, Gij, and Bij. write.

  FIG. 3 is a configuration diagram showing an example of an electrical configuration of the color liquid crystal display device 100 according to the present invention. The color liquid crystal display device 100 includes an X driver 31, a Y driver 32, an LED driver 33, a CPU 34, a video memory 35, a RAM 36, and a ROM 37.

  The X driver 31 and the Y driver 32 (corresponding to a part of the liquid crystal control means) apply a voltage between the electrode substrates 11 and 12 in accordance with an instruction from the CPU 34 (an opening control unit 345 described later with reference to FIG. 4). To be applied. The LED driver 33 (corresponding to a part of the light emission control means) supplies current to the LED 21 in accordance with an instruction from the CPU 34 (light emission control unit 344 described later with reference to FIG. 4).

  A CPU (Central Processing Unit) 34 controls the overall operation of the color liquid crystal display device 100. The video memory 35 stores video information supplied from the outside (for example, a DVD player). A RAM (Random Access Memory) 36 stores correction values calculated by the CPU 34 (correction value calculation unit 343, which will be described later with reference to FIG. 4). A ROM (Read Only Memory) 37 stores a control program for operating the CPU 34 and the like.

  FIG. 4 is a block diagram showing an example of the functional configuration of the main part of the color liquid crystal display device 100 according to the present invention. The CPU 34 functionally includes an image acquisition unit 341, an external light detection unit 342, a correction value calculation unit 343, a light emission control unit 344, and an opening degree control unit 345, and the RAM 36 functionally includes a reference value storage unit. 361, a luminance correction value storage unit 362, and an opening correction value storage unit 363.

  Here, the CPU 34 reads out and executes a control program stored in advance in the ROM 37 or the like shown in FIG. 3, so that the image acquisition unit 341, the external light detection unit 342, the correction value calculation unit 343, the light emission control unit 344, It functions as a functional unit such as the degree control unit 345, and causes the RAM 36 to function as functional units such as a reference value storage unit 361, a brightness correction value storage unit 362, and an opening correction value storage unit 363.

  Further, among various data stored in the RAM 36 and ROM 37 shown in FIG. 3, data that can be stored in a removable recording medium is, for example, a hard disk drive, an optical disk drive, a flexible disk drive, a silicon disk drive, a cassette medium reader, etc. In this case, the recording medium is, for example, a hard disk, an optical disk, a flexible disk, a CD (Compact Disk), a DVD (Digital Versatile Disk), a semiconductor memory, or the like.

  The reference value storage unit 361 corrects correction values R0ij, G0ij, and B0ij (i = 1) for correcting variation between the alignment characteristics of the liquid crystal corresponding to one pixel composed of R, G, and B of the liquid crystal layer 13 shown in FIG. -M, j = 1 to N: M = 720, N = 1280) and correction values Y0ij (i = 1 to M, j = 1 to N: M = 720) for correcting variations in the light emission characteristics of the LED 21 , N = 1280) in advance (for example, during adjustment after manufacture).

  The correction values R0ij, G0ij, and B0ij stored in the reference value storage unit 361 are read by the opening degree control unit 345, and the correction value Y0ij is read by the light emission control unit 344.

  The brightness correction value storage unit 362 (corresponding to a part of the correction unit) is a correction value YAij (i = 1 to M, j = 1 to 1) corresponding to the variation in the brightness of the external light calculated by the correction value calculation unit 343. N: M = 720, N = 1280). The correction value YAij stored in the luminance correction value storage unit 362 is read by the light emission control unit 344.

  The opening correction value storage unit 363 (corresponding to a part of the correction unit) is a correction value RAij corresponding to variations in the R color component, G color component, and B color component of the external light calculated by the correction value calculation unit 343. , GAij, BAij (i = 1 to M, j = 1 to N: M = 720, N = 1280). The correction values RAij, GAij, and BAij stored in the opening correction value storage unit 363 are read by the opening control unit 345.

  The image acquisition unit 341 reads video information stored in the video memory 35 and outputs the video information to the light emission control unit 344 and the opening degree control unit 345. Here, the video information includes the R color component RPij, the G color component GPij of the pixel of the row number i (i = 1 to M: M = 720) and the column number j (j = 1 to N: N = 1280), and , B color component BPij.

  The external light detection unit 342 (corresponding to a part of the external light detection means) detects the amount of external light emitted from the outside via the liquid crystal display panel 1. Specifically, the external light detection unit 342 controls the opening control unit 345 to maximize the opening, and controls the light emission control unit 344 to stop the light emission of the first predetermined number of LEDs 21. The amount of external light irradiated from the outside is detected via the CMOS image sensor 22.

  Here, the external light information detected by the external light detection unit 342 is arranged at the position of the row number i (i = 1 to M: M = 720) and the column number j (j = 1 to N: N = 1280). It consists of a luminance component Yij, an R color component Rij, a G color component Gij, and a B color component Bij output from the CMOS image sensor 22 provided.

  The correction value calculation unit 343 (corresponding to a part of the correction unit) corrects the light emission amount of the first predetermined number of LEDs 21 based on the external light information detected by the external light detection unit 342 (YA = (i = 1 to M, j = 1 to N: M = 720, N = 1280) is calculated and written to the luminance correction value storage unit 362.

Here, the correction value YAij is given by the following equation (1).
Correction value YAij = luminance component Yij−luminance component Yhk (1)
However, h = M / 2 (= 360) and k = N / 2 (= 640). That is, the correction value YAij is a luminance difference with respect to the luminance component Yhk corresponding to the pixel at the center position (corresponding to a predetermined position set in advance) of the liquid crystal display panel 1 of the luminance component Yij detected by the external light detection unit 342. is there.

  Further, the correction value calculation unit 343 corrects the opening degree of the liquid crystal display panel 1 based on the external light information detected by the external light detection unit 342. The correction values RAij, GAij, BAij (i = 1 to M, j = 1 to N: M = 720, N = 1280) is calculated and written to the opening correction value storage unit 363.

Here, the correction values RAij, GAij, and BAij are given by the following equations (2) to (4).
Correction value RAij = R color component Rij−R color component Rhk (2)
Correction value GAij = G color component Gij−G color component Ghk (3)
Correction value BAij = B color component Bij−B color component Bhk (4)
However, h = M / 2 (= 360) and k = N / 2 (= 640). That is, the correction values RAij, GAij, and BAij are the center positions of the liquid crystal display panel 1 of the R color component Rij, G color component Gij, and B color component Bij detected by the external light detection unit 342 (predetermined predetermined values). This is a difference with respect to the R color component Rhk, the G color component Ghk, and the B color component Bhk corresponding to the pixel corresponding to the position).

  The light emission control unit 344 (corresponding to a part of the light emission control means) controls the amount of light emitted from the first predetermined number of LEDs 21 provided in the backlight light source 2, and is externally detected by the external light detection unit 342. When the amount of light is detected, the LED 21 is turned off in accordance with an instruction from the external light detection unit 342.

Further, the light emission control unit 344 includes the correction value Y0ij stored in the reference value storage unit 361 and the correction value YAij (i = 1 to M, j = 1 to N: M stored in the luminance correction value storage unit 362). = 720, N = 1280), and the amount of light emitted from the LED 21 is controlled. That is, the light emission control unit 344 controls the light emission amount Eij of the LED 21 corresponding to the row number i and the column number j to a value obtained by the following equation (5).
Light emission amount Eij = correction value Y0ij + correction value YAij (5)

  The opening degree control unit 345 (corresponding to a part of the liquid crystal control unit) controls the opening degree for each pixel of the liquid crystal display panel 1, and the outside light detection unit 342 detects the amount of outside light. In this case, the opening degree of the liquid crystal display panel 1 is controlled to be maximum according to an instruction from the external light detection unit 342.

  Further, the opening degree control unit 345 includes correction values R0ij, G0ij, B0ij stored in the reference value storage unit 361, and correction values RAij, GAij, BAij (i = 1) stored in the opening degree correction value storage unit 363. ˜M, j = 1 to N: M = 720, N = 1280), and the opening degree of the liquid crystal display panel 1 is controlled to display the video information acquired by the image acquisition unit 341 (= X driver 31). The voltage applied between the electrode substrates 11 and 12 via the Y driver 32 is controlled.

That is, the opening degree control unit 345 sets the opening degrees TRij, TGij, TBij of the liquid crystal display panel 1 corresponding to the R color component, G color component, and B color component of the pixel of row number i and column number j, It controls to the value calculated | required by following (6)-(8) Formula.
Opening TRij = RPij + R0ij + RAij (6)
Opening TGij = GPij + G0ij + GAij (7)
Opening TBij = BPij + B0ij + BAij (8)

  FIG. 5 is a flowchart showing an example of the external light amount detection processing of the color liquid crystal display device 100 (mainly the CPU 34). First, the light emission of the LED 21 is stopped by the external light detection unit 342 via the light emission control unit 344 (S101). Then, the outside light detection unit 342 sets the opening degree to the maximum via the opening degree control part 345 (S103). Next, the amount of external light is detected by the external light detection unit 342 via the CMOS image sensor 22, and external light information (= luminance component Yij, R color component Rij, G color component Gij, and B color component Bij) is obtained. It is generated (S105).

  Next, the correction value calculation unit 343 calculates a correction value YAij for correcting the light emission amount of the LED 21 (S107). Then, the correction value calculation unit 343 calculates correction values RAij, GAij, and BAij for correcting the opening degree of the liquid crystal display panel 1 (S109). Next, the correction value calculation unit 343 stores the correction value YAij calculated in step S107 in the luminance correction value storage unit 362, and the correction values RAij, GAij, and BAij calculated in step S109 are stored in the opening correction value. The data is stored in the unit 363 (S111), and the process is terminated.

  FIG. 6 is a flowchart showing an example of correction processing of the color liquid crystal display device 100 (mainly the MPU 34). First, the video information stored in the video memory 35 is acquired by the image acquisition unit 341 (S201). The light emission control unit 344 reads the correction value Y0ij stored in the reference value storage unit 361 (S203). Next, the light emission control unit 344 reads the correction value YAij stored in the luminance correction value storage unit 362 (S205). Next, the light emission control unit 344 sets the light emission amount Eij of the LED 21 using the correction value Y0ij read in step S203 and the correction value YAij read in step S205 (S207).

  Then, the correction values R0ij, G0ij, and B0ij stored in the reference value storage unit 361 are read by the opening degree control unit 345 (S209). Next, the correction values RAij, GAij, and BAij stored in the opening correction value storage unit 363 are read by the opening control unit 345 (S211). Next, the video information (= R color component RPij, G color component GPij, and B color component BPij) acquired in step S201 by the opening degree control unit 345, the correction values R0ij and G0ij read in step S209. , B0ij, and the correction values RAij, GAij, and BAij read in step S205, the opening degrees TRij, TGij, and TBij of the liquid crystal display panel 1 are set (S213), and the process ends.

  In this way, the opening degree is controlled for each pixel of the liquid crystal display panel 1 by the opening degree control unit 345, and the first predetermined number (here, M) disposed in the backlight light source 2 by the light emission control unit 344. The amount of light emitted by the LEDs 21 of × N: M = 720, N = 1280) is controlled. And the light quantity of the external light irradiated from the outside is detected via the liquid crystal display panel 1, and based on the detected light quantity of the external light, a 1st predetermined | prescribed via the opening degree control part 345 and the light emission control part 344 is detected. Since the amount of light emitted from the LEDs 21 and the opening of the liquid crystal display panel 1 are corrected, it is possible to display an image with good quality even when external light is irradiated.

  That is, the amount of external light emitted from the outside is detected via the liquid crystal display panel 1, and a first predetermined number (here, M × N: M = 720, based on the detected amount of external light) N = 1280), the amount of light emitted from the LED 21 and the opening of the liquid crystal display panel 1 are corrected. For example, when the amount of external light is large, control is performed to increase the amount of light emitted from the LED 21 at the corresponding position. By doing so, correction for external light can be performed, so that even when external light is irradiated, an image with good quality can be displayed.

  Further, the opening degree is controlled through the opening degree control unit 345 so that the opening degree is maximized, and the first predetermined number (here, M × N: M = 720, N = 1280) of the LEDs 21 is controlled via the light emission control unit 344. Since the amount of external light emitted from the outside is detected under control to stop the light emission, the amount of external light emitted from the outside can be accurately detected.

  That is, the opening degree is controlled through the opening degree control unit 345 so that the opening degree is maximized, and the first predetermined number (here, M × N: M = 720, N = 1280) of the LED 21 is controlled through the light emission control unit 344. Since the amount of external light radiated from the outside is detected by being controlled to stop the light emission, the light beam emitted from the first predetermined number of LEDs 21 is not received, and through the opening degree control unit 345. Since the amount of external light is detected under the condition that the amount of transmitted external light is maximized, the amount of external light emitted from the outside can be accurately detected.

  Furthermore, from the outside through two or more second predetermined number (here, M × N: M = 720, N = 1280) CMOS image sensors 22 (see FIGS. 1 and 2) arranged in a lattice pattern. Since the amount of external light irradiated is detected, the amount of external light irradiated from the outside can be detected more accurately.

  That is, the amount of external light irradiated from the outside through the CMOS image sensors 22 of a second predetermined number (here, M × N: M = 720, N = 1280) that is two or more arranged in a grid pattern. Therefore, even when the external light applied to the liquid crystal display panel 1 is non-uniform, the distribution of the amount of external light applied to the liquid crystal display panel 1 can be detected. Thus, the amount of external light can be detected more accurately.

  In addition, the amount of light detected by the second predetermined number (here, M × N: M = 720, N = 1280) of the CMOS image sensors 22 is preset in the second predetermined number of CMOS image sensors 22. Light quantity (= luminance component Yhk, R color component Rhk, G color component Ghk, B color) detected by the reference image sensor disposed at the predetermined position (here, the center position of the liquid crystal display panel 1) A light amount difference with respect to the component Bhk: h = M / 2 (= 360), k = N / 2 (= 640)) is obtained, and the obtained light amount difference (= correction value YAij, correction value RAij, correction value GAij, correction) Based on the value BAij), the amount of light emitted from the first predetermined number of LEDs 21 and the opening of the liquid crystal display panel 1 are corrected, so that an image of good quality can be easily displayed even when external light is irradiated. To do Kill.

  That is, the light quantity detected by the second predetermined number (here, M × N: M = 720, N = 1280) of the CMOS image sensors 22 is preset in the second predetermined number of CMOS image sensors 22. A light amount difference (= correction value YAij, correction value RAij, correction value GAij, correction value) with respect to the amount of external light detected by a reference image sensor disposed at a predetermined position (here, the central position of the liquid crystal display panel 1). BAij) is obtained, and the light emission quantity of the first predetermined number of LEDs 21 and the opening degree of the liquid crystal display panel 1 are corrected based on the obtained light quantity difference. Even in the case of non-uniformity, correction corresponding to the distribution of the amount of external light applied to the liquid crystal display panel 1 can be easily performed, so that a good product can be obtained even when external light is applied. It is possible to make the image displayed easily.

  In addition, the liquid crystal display panel 1 includes R, G, and B color filters 14 for each pixel, and is configured to be able to control the opening degree corresponding to each color filter 14 of each pixel. Then, the luminance component Yij of the external light, the R color component Rij, the G color component Gij, and the second predetermined number (here, M × N: M = 720, N = 1280) CMOS image sensors 22 , The B color component Bij is detected, and the light emission quantity of the first predetermined number of LEDs 21 is corrected based on the detected luminance component Yij of the external light, and the detected R color component Rij and G color component Gij of the external light are detected. Further, the opening degree of the liquid crystal display panel 1 corresponding to the corresponding color filter 14 is corrected based on the B color component Bij, and thus even better quality images are displayed even when external light is irradiated. be able to.

  That is, the luminance component Yij of the external light, the R color component Rij, the G color component Gij, and the second predetermined number (here, M × N: M = 720, N = 1280) of the CMOS image sensors 22 , The B color component Bij is detected, and the light emission quantity of the first predetermined number of LEDs 21 is corrected based on the detected luminance component Yij of the external light, and the detected R color component Rij and G color component Gij of the external light are detected. Since the opening degree of the liquid crystal display panel 1 corresponding to the corresponding color filter 14 is corrected based on the B color component Bij, the external light irradiated on the liquid crystal display panel 1 is not white light (= colored light). In this case, the correction corresponding to the external light applied to the liquid crystal display panel 1 can be accurately performed, so that even when the external light is applied, a better quality image can be displayed. Can .

  Further, the first predetermined number that is the number of LEDs 21 arranged in the backlight light source 2 and the second predetermined number that is the number of CMOS image sensors 22 that detect external light are the same as the number of pixels of the liquid crystal display panel 1. (In this case, M × N: M = 720, N = 1280), so that even when external light is irradiated, an image with better quality can be displayed.

  That is, the first predetermined number that is the number of LEDs 21 arranged in the backlight light source 2 and the second predetermined number that is the number of CMOS image sensors 22 that detect external light are the same as the number of pixels of the liquid crystal display panel 1. (Here, M × N: M = 720, N = 1280), the correction corresponding to the external light can be accurately performed for each pixel. It is possible to display a video of good quality.

The present invention can also be applied to the following forms.
(A) In the present embodiment, the color liquid crystal display device 100 includes the same number of LEDs 21 and CMOS image sensors 22 as the number of pixels of the liquid crystal display panel 1 (here, M × N: M = 720, N = 1280). Although the case where it is provided has been described, the number of LEDs 21 (first predetermined number) and the number of CMOS image sensors 22 (second predetermined number) are smaller than the number of pixels of the liquid crystal display panel 1 (for example, 1/4 of the number of pixels). The form which is. In this case, the device configuration of the color liquid crystal display device 100 is simplified. Alternatively, the number of CMOS image sensors 22 (second predetermined number) may not be the same as the number of LEDs 21 (first predetermined number) (for example, 1/4 of the number of LEDs 21).

  (B) In the present embodiment, the light emission control unit 344 and the opening degree control unit 345 are configured so that the light emission amount Eij of the LED 21 and the opening of the liquid crystal display panel 1 are based on the external light information detected by the external light detection unit 342, respectively. Although the case where the degrees TRij, TGij, and TBij are corrected has been described, one of the light emission control unit 344 and the opening degree control unit 345 (for example, the light emission control unit 344) is included in the external light information detected by the external light detection unit 342. Based on the light emission amount Eij of the LED 21 and one of the opening degrees TRij, TGij, TBij of the liquid crystal display panel 1 (for example, the light emission amount Eij of the LED 21) may be corrected.

  (C) In this embodiment, the case where the CPU 11 functionally includes the image acquisition unit 341, the external light detection unit 342, the correction value calculation unit 343, the light emission control unit 344, and the opening degree control unit 345 has been described. However, at least one functional unit among the image acquisition unit 341, the external light detection unit 342, the correction value calculation unit 343, the light emission control unit 344, and the opening degree control unit 345 is configured by hardware such as a circuit. It may be a form.

These are the perspective views which show an example of a structure of the color liquid crystal display device based on this invention. FIG. 3 is a perspective view showing an example of a backlight light source. These are the block diagrams which show an example of the electrical constitution of the color liquid crystal display device which concerns on this invention. These are the block diagrams which show an example of a function structure of the principal part in the color liquid crystal display device which concerns on this invention. These are the flowcharts which show an example of the external light quantity detection process of a color liquid crystal display device (mainly CPU). These are the flowcharts which show an example of the correction process of a color liquid crystal display device (mainly MPU).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Color liquid crystal display device 1 Liquid crystal display panel 11, 12 Electrode substrate 13 Liquid crystal layer 14 Color filter 15 Polarizing plate 2 Backlight light source 21 LED
22 CMOS image sensor (part of external light detection means)
31 X driver (part of liquid crystal control means)
32 Y driver (part of liquid crystal control means)
33 LED driver (part of light emission control means)
35 Video memory 34 CPU
341 Image acquisition unit 342 External light detection unit (part of external light detection means)
343 Correction value calculation unit (part of correction means)
344 Light emission control unit (part of light emission control means)
345 Opening control unit (part of liquid crystal control means)
36 RAM
361 Reference value storage unit 362 Brightness correction value storage unit (part of correction means)
363 Opening correction value storage (part of correction means)

Claims (6)

A liquid crystal display panel configured to be able to control the opening degree by controlling the orientation direction of the liquid crystal for each pixel, and the liquid crystal display panel having a first predetermined number of two or more LEDs arranged in a grid pattern A backlight source that irradiates from the side, and a liquid crystal display device comprising:
Liquid crystal control means for controlling the opening degree for each pixel of the liquid crystal display panel;
Light emission control means for controlling the light emission amount of the first predetermined number of LEDs disposed in the backlight light source;
External light detection means for detecting the amount of external light irradiated from the outside via the liquid crystal display panel;
Based on the amount of external light detected by the external light detection means via at least one of the liquid crystal control means and the light emission control means, the light emission amount of the first predetermined number of LEDs and the opening of the liquid crystal display panel. Correction means for correcting at least one of the degrees,
A liquid crystal display device comprising:   The external light detection means controls the liquid crystal control means to maximize the opening degree, causes the light emission control means to control light emission of the first predetermined number of LEDs, and irradiates from the outside. The liquid crystal display device according to claim 1, wherein the amount of external light to be detected is detected.   The external light detection means includes two or more second predetermined number of complementary metal oxide semiconductor (CMOS) image sensors arranged in a lattice pattern, and is irradiated from the outside through the second predetermined number of CMOS image sensors. The liquid crystal display device according to claim 1, wherein the amount of external light is detected.   The correction means is a reference disposed at a predetermined position in the second predetermined number of CMOS image sensors, with the amount of light detected by the second predetermined number of CMOS image sensors of the external light detection means. A light amount difference with respect to the amount of external light detected by the image sensor is obtained, and at least one of the light emission amount of the first predetermined number of LEDs and the opening of the liquid crystal display panel is corrected based on the obtained light amount difference. The liquid crystal display device according to claim 3. The liquid crystal display panel includes R (Red), G (Green), and B (Blue) color filters for each pixel, and is configured to control the opening corresponding to each color filter of each pixel. And
The external light detection means detects a luminance component, R color component, G color component, and B color component of external light through the second predetermined number of CMOS image sensors,
The correction means corrects the light emission amount of the first predetermined number of LEDs based on the luminance component of the external light detected by the external light detection means, and the external light R detected by the external light detection means. 5. The liquid crystal display device according to claim 3, wherein the opening degree of the liquid crystal display panel corresponding to the corresponding color filter is corrected based on the color component, the G color component, and the B color component. .   The liquid crystal display device according to claim 3, wherein the first predetermined number and the second predetermined number are substantially the same as the number of pixels of the liquid crystal display panel.

Images